@article{MuellerFischerBartoszeketal.2013, author = {M{\"u}ller, Martin and Fischer, U. and Bartoszek, G. and Grill, E. and Meyer, G.}, title = {Impact of joint contractures on functioning and social participation in older individuals--development of a standard set (JointConFunctionSet): study protocol}, series = {BMC Geriatrics}, journal = {BMC Geriatrics}, editor = {Springer Nature,}, year = {2013}, abstract = {Background Joint contractures are frequent in older individuals in geriatric care settings. Even though they are used as indicator of quality of care, there is neither a common standard to describe functioning and disability in patients nor an established standardized assessment to describe and quantify the impact of joint contractures on patients' functioning. Thus, the aim of our study is (1) to develop a standard set for the assessment of the impact of joint contractures on functioning and social participation in older individuals and (2) to develop and validate a standardized assessment instrument for describing and quantifying the impact of joint contractures on the individuals' functioning. Methods The standard set for joint contractures integrate the perspectives of all potentially relevant user groups, from the affected individuals to clinicians and researchers. The development of this set follows the methodology to develop an International Classification of Functioning Disability and Health (ICF) Core Set and involves a formal decision-making and consensus process. Evidence from four preparatory studies will be integrated including qualitative interviews with patients, a systematic review of the literature, a survey with health professionals, and a cross sectional study with patients affected by joint contractures. The assessment instrument will be developed using item-response-theory models. The instrument will be validated. Discussion The standard set for joint contractures will provide a list of aspects of functioning and health most relevant for older individuals in geriatric care settings with joint contractures. This list will describe body functions, body structures, activities and participation and related environmental factors. This standard set will define what aspects of functioning should be assessed in individuals with joint contractures and will be the basis of the new assessment instrument to evaluate the impact of joint contractures on functioning and social participation.}, language = {en} } @article{SaalMeyerBeutneretal.2018, author = {Saal, S. and Meyer, G. and Beutner, K. and Klingshirn, H. and Strobl, R. and Grill, E. and Mann, E. and K{\"o}pke, S. and Bleijlevens, M.H.C. and Bartoszek, G. and Stephan, A.-J. and Hirt, J. and M{\"u}ller, Martin}, title = {Development of a complex intervention to improve participation of nursing home residents with joint contractures: a mixed-method study}, series = {BMC Geriatrics}, journal = {BMC Geriatrics}, year = {2018}, abstract = {Background Joint contractures in nursing home residents limit the capacity to perform daily activities and restrict social participation. The purpose of this study was to develop a complex intervention to improve participation in nursing home residents with joint contractures. Methods The development followed the UK Medical Research Council framework using a mixed-methods design with re-analysis of existing interview data using a graphic modelling approach, group discussions with nursing home residents, systematic review of intervention studies, structured 2-day workshop with experts in geriatric, nursing, and rehabilitation, and group discussion with professionals in nursing homes. Results Graphic modelling identified restrictions in the use of transportation, walking within buildings, memory functions, and using the hands and arms as the central target points for the intervention. Seven group discussions with 33 residents revealed various aspects related to functioning and disability according the International Classification of Functioning, Disability and Health domains body functions, body structures, activities and participation, environmental factors, and personal factors. The systematic review included 17 studies with 992 participants: 16 randomised controlled trials and one controlled trial. The findings could not demonstrate any evidence in favour of an intervention. The structured 2-day expert workshop resulted in a variety of potential intervention components and implementation strategies. The group discussion with the professionals in nursing homes verified the feasibility of the components and the overall concept. The resulting intervention, Participation Enabling CAre in Nursing (PECAN), will be implemented during a 1-day workshop for nurses, a mentoring approach, and supportive material. The intervention addresses nurses and other staff, residents, their informal caregivers, therapists, and general practitioners. Conclusions In view of the absence of any robust evidence, the decision to use mixed methods and to closely involve both health professionals and residents proved to be an appropriate means to develop a complex intervention to improve participation of and quality of life in nursing home residents. We will now evaluate the PECAN intervention for its impact and feasibility in a pilot study in preparation for an evaluation of its effectiveness in a definitive trial. Trial registration German clinical trials register, reference number DRKS00010037 (12 February 2016).}, language = {en} } @article{BartoszekFischerMuelleretal.2016, author = {Bartoszek, G. and Fischer, U. and M{\"u}ller, Martin and Strobl, R. and Grill, E. and Nadolny, S. and Meyer, G.}, title = {Outcome measures in older persons with acquired joint contractures: a systematic review and content analysis using the ICF (International Classification of Functioning, Disability and Health) as a reference}, series = {BMC Geriatrics}, journal = {BMC Geriatrics}, editor = {BioMed Central,}, year = {2016}, abstract = {Background: Joint contractures are a common health problem in older persons with significant impact on activities of daily living. We aimed to retrieve outcome measures applied in studies on older persons with joint contractures and to identify and categorise the concepts contained in these outcome measures using the ICF (International Classification of Functioning, Disability and Health) as a reference. Methods: Electronic searches of Medline, EMBASE, CINAHL, Pedro and the Cochrane Library were conducted (1/2002-8/2012). We included studies in the geriatric rehabilitation and nursing home settings with participants aged ≥ 65 years and with acquired joint contractures. Two independent reviewers extracted the outcome measures and transferred them to concepts using predefined conceptual frameworks. Concepts were subsequently linked to the ICF categories. Results: From the 1057 abstracts retrieved, 60 studies met the inclusion criteria. We identified 52 single outcome measures and 24 standardised assessment instruments. A total of 1353 concepts were revealed from the outcome measures; 96.2 \% could be linked to 50 ICF categories in the 2nd level; 3.8 \% were not categorised. Fourteen of the 50 categories (28 \%) belonged to the component Body Functions, 4 (8 \%) to the component Body Structures, 26 (52 \%) to the component Activities and Participation, and 6 (12 \%) to the component Environmental Factors. Conclusions: The ICF is a valuable reference for identifying and quantifying the concepts of outcome measures on joint contractures in older people. The revealed ICF categories remain to be validated in populations with joint contractures in terms of clinical relevance and personal impact.}, language = {en} } @article{MuellerBartoszekBeutneretal.2015, author = {M{\"u}ller, Martin and Bartoszek, G. and Beutner, K. and Klingshirn, H. and Saal, S. and Stephan, A.-J. and Strobl, R. and Grill, E. and Meyer, G.}, title = {Developing and piloting a multifactorial intervention to address participation and quality of life in nursing home residents with joint contractures}, series = {German medical science}, journal = {German medical science}, editor = {NCBI,}, year = {2015}, abstract = {Background: Joint contractures are common problems in frail older people in nursing homes. Irrespective of the exact extent of older individuals in geriatric care settings living with joint contractures, they appear to be a relevant problem. Also, the new emphasis on the syndrome of joint contractures, e. g. by the German statutory long term care insurance, led to an increase in assessment and documentation efforts and preventive interventions in clinical care. However, more attention should be paid to the actual situation of older individuals in nursing homes with prevalent joint contractures, particularly their experience of related activity limitations and participation restrictions. Thus, the aim of this study is 1) to develop a tailored intervention to improve functioning, and especially participation and quality of life in older residents with joint contractures in nursing homes and 2) to test the feasibility of the intervention accompanied by a rigorous process evaluation. Methods: The complex intervention, which will be developed in this project follows the UK Medical Research Council (MRC) framework and integrates the perspectives of all potentially relevant user groups, from the affected individuals to clinicians and researchers. The development process will comprise a systematic literature review, reanalysis of existing data and the integration of the knowledge of the affected individuals and experts. The developed intervention including a comprehensive process evaluation will be pilot tested with residents with joint contractures in three nursing homes. Discussion: The projected study will provide a tailored intervention to improve functioning, participation and quality of life in older residents with joint contractures in nursing homes. With this focus, the intervention will support patient relevant outcomes. The pilot study including process evaluation will offer a first opportunity to indicate the size of the intervention's effect and prepare further studies.}, language = {en} } @article{FischerMuellerStrobletal.2015, author = {Fischer, U. and M{\"u}ller, Martin and Strobl, R. and Bartoszek, G. and Meyer, G. and Grill, E.}, title = {Prevalence of functioning and disability in older patients with joint contractures: a cross-sectional study}, series = {European Journal of physical and rehabilitation medicine}, journal = {European Journal of physical and rehabilitation medicine}, editor = {minerva medica,}, year = {2015}, language = {en} } @article{FischerBartoszekMuelleretal.2014, author = {Fischer, U. and Bartoszek, G. and M{\"u}ller, Martin and Strobl, R. and Meyer, G. and Grill, E.}, title = {Patients' view on health-related aspects of functioning and disability of joint contractures: a qualitative interview study based on the International Classification of Functioning, Disability and Health}, series = {Disability and Rehabilitation}, journal = {Disability and Rehabilitation}, editor = {Taylor and Francis online,}, year = {2014}, abstract = {Purpose: The aim of this study was to identify health-relevant aspects of functioning and disability of persons aged 65 years or older with joint contractures, to link the findings to corresponding ICF categories and to describe the patients' perspective. Methods: We conducted 43 qualitative, semi-structured, face-to-face interviews with affected persons in two different locations (Witten, Munich) and in three different settings. Data were analyzed using the "meaning condensation procedure" and then linked to ICF categories. Results: From all interviews a total of 2499 single meaning-concepts were extracted which were linked to 324 different ICF categories. The participants in all settings mainly reported problems related to "Mobility of a single joint (b710)", "Sensation of pain (b280)" and problems related to "Walking (d450)". Almost all participants reported "Products and technology for personal indoor and outdoor mobility and transportation (e120)" as a relevant environmental factor. Conclusions: From the patients' perspective, joint contractures have an impact on multifaceted aspects of functioning and disability, mainly body functions, environmental factors and activities and participation. The results of this study will contribute to the development of a standard instrument for measuring functioning, disability and health-relevant aspects for patients with joint contractures. Implications for Rehabilitation Joint contractures are a major cause for the development of disability in older people. Patients' perspectives and their personal experiences have to be considered when assessing the impact of joint contractures. The International Classification of Functioning, Disability and Health (ICF) is an appropriate framework for describing the patients' multifaceted experience of joint contractures.}, language = {en} } @article{FischerMuellerStrobletal.2014, author = {Fischer, U. and M{\"u}ller, Martin and Strobl, R. and Bartoszek, G. and Meyer, G. and Grill, E.}, title = {Examining Functioning and Contextual Factors in Individuals with Joint Contractures from the Health Professional Perspective Using the ICF: An International Internet-Based Qualitative Expert Survey}, series = {Rehabilitation nursing}, journal = {Rehabilitation nursing}, editor = {Elaine Tilka, Miller}, year = {2014}, abstract = {Purpose The aim of this study was to identify disease-related aspects of functioning and disability in people with joint contractures from a health professionals' perspective and to describe the findings, using categories of the International Classification of Functioning, Disability, and Health (ICF). Design An Internet-based expert survey. Methods We asked international health professionals for typical problems in functioning and important contextual factors of individuals with joint contractures using an Internet-based open-ended questionnaire. All answers were linked to the ICF according to established rules. Absolute and relative frequencies of the linked ICF categories were reported. Findings Eighty experts named 1785 meaning units which could be linked to 256 ICF categories. Among the categories, 24.2\% belonged to the component Body Functions, 20.7\% to Body Structures, 36.3\% to Activities and Participation, and 18.8\% to Environmental Factors. Conclusion Health professionals addressed a large variety of functional problems and multifaceted aspects due to the symptom joint contractures. Clinical Relevance International health professionals reported a large variety of aspects of functioning and health, which are related to joint contractures}, language = {de} } @article{MuellerFischerBartoszeketal.2013, author = {M{\"u}ller, Martin and Fischer, U. and Bartoszek, G. and Grill, E. and Meyer, G.}, title = {Impact of joint contractures on functioning and social participation in older individuals--development of a standard set (JointConFunctionSet)}, series = {BMC Geriatrics}, journal = {BMC Geriatrics}, editor = {Springer Nature,}, year = {2013}, abstract = {Background Free movement of the limbs is a prerequisite of mobility and autonomy in old age. Joint contractures, i.e. restrictions in full range of motion of any joint due to deformity, disuse or pain, are common problems of frail older people, particularly in nursing home residents. Contractures are among the most unexplored and underreported syndromes in clinical and homecare settings. Epidemiological studies indicate a wide range of prevalence of joint contractures in older individuals between 20\% and 80\%. This variation is due to different definitions of contracture and varying diagnostic criteria or data collection methods, different research settings, sample size and study participants? characteristics. The aetiology of joint contractures is multifaceted. In older people contractures may be caused by a variety of health conditions and situations, but immobility due to an acute injury or disease seems to be the major risk factor. Upper limb joint contractures may result in loss of ability to dress or eat independently while lower limb contractures may lead to instability and inability to walk independently and higher risk of bed confinement. Joint contractures further increase the risk of other adverse patient outcomes like pain, pressure ulcers and risk of falls. Thus, joint contractures are a major cause for excess disability in older people with a significant impact on overall quality of life and functioning. Preventive and rehabilitation interventions targeting joint contractures may decrease morbidity, increase functioning and quality of life, and, ultimately, prevent long-term disability. In the United States of America, presence of joint contractures is an established indicator of quality of care in nursing facilities. In Germany, joint contracture risk assessment and prevention have recently been defined as a quality indicator of nursing home care that should be regularly monitored by experts from the statutory health insurance system. Nursing homes are obliged to report whether they regularly assess the risk of joint contracture and administer relevant preventive measures. In clinical settings, joint contractures are assessed by measuring the range of motion. However, from a patient- and nursing-oriented perspective the relevance of a systematic registration of contractures in care-dependent older people is unclear unless their impact on functioning is understood. Contracture assessment is only an intermediate step in the evaluation of patient-relevant outcomes such as quality of life, functioning, and the ability to participate in everyday life and social participation. Arguably, a clinical definition of joint contracture is difficult because the contracture?s severity is determined by the consequences on activities of daily living, quality of life and social participation. In addition, there is no consensus on aspects most relevant to the affected individuals. A variety of functional measures is currently used for the assessment and evaluation of geriatric patients. To date, there is no consensus on common concepts for the choice of outcome measures specifically for evaluating the impact of interventions targeted on joint}, language = {en} } @inproceedings{KohrmannBuchschmidSchandaetal.2016, author = {Kohrmann, M. and Buchschmid, M. and Schanda, Ulrich and M{\"u}ller, G.}, title = {A FEM-based planning tool for the vibro-acoustic design of wooden floors at low frequencies}, series = {Proceedings of Inter-Noise 2016}, booktitle = {Proceedings of Inter-Noise 2016}, year = {2016}, abstract = {Within the scope of the recently finished cooperate research project "VibWood" at Technical University of Munich and Rosenheim University of Applied Sciences, fully parametrized numerical models for lightweight wooden floor constructions have been developed and calibrated by experimental modal analyses. Based on a vast parametric study including floating floors and suspended ceilings a database of narrowband sound power levels in the frequency range up to 125 Hz for a wide range of floor dimensions has been set up. A procedure will be presented on how to process the numerical data and derive single number values that allow a comparison to the standardized rating of impact sound insulation according to DIN EN ISO 717-2. The derived data is implemented into a graphical user interface (GUI). This GUI is available for free. The database is open for additional geometries and will be enhanced by different constructions in the near future.}, language = {en} } @article{MuellerGrillStierJarmeretal.2011, author = {M{\"u}ller, Martin and Grill, E. and Stier-Jarmer, M. and Strobl, R. and Gutenbrunner, C. and Fialka-Moser, V. and Stucki, G.}, title = {Validation of the comprehensive ICF Core Sets for patients receiving rehabilitation interventions in the acute care setting}, series = {Journal of rehabilitation medicine}, journal = {Journal of rehabilitation medicine}, number = {43(2)}, editor = {Foundation of Rehabilitation Information,}, year = {2011}, abstract = {Objective: To examine the relevance and completeness of the comprehensive International Classification of Functioning, Disability and Health (ICF) Core Sets for patients with rehabilitation needs in acute hospital care. Design: Multi-centre cohort study. Patients: A total of 391 patients (50.1\% female, mean age 63.4 years) from 4 university hospitals in Austria, Germany and Switzerland and one Austrian general hospital. Methods: Data on functioning were collected using the respective comprehensive acute ICF Core Sets. Data were extracted from patients' medical record sheets and interviews with health professionals and patients. Results: Most of the categories of the comprehensive ICF Core Sets describing impairments, limitations or restrictions occurred in a considerable proportion of the study population. The most outstanding limitations and restrictions of the patients were problems with sleep and blood vessel functions, walking and moving and self-care. Thirty-eight aspects of functioning not previously covered by the comprehensive ICF Core Sets were ranked as relevant. Conclusion: Categories of the comprehensive ICF Core Sets for the acute hospital situation were confirmed. Some additional categories not covered by the Set in its present version emerged from the interviews, and should be considered for inclusion in a finalized version.}, language = {en} } @article{GrillStroblMuelleretal.2011, author = {Grill, E. and Strobl, R. and M{\"u}ller, Martin and Quittan, M. and Kostanjsek, N. and Stucki, G.}, title = {ICF Core Sets for early post-acute rehabilitation facilities}, series = {Journal of rehabilitation medicine}, journal = {Journal of rehabilitation medicine}, number = {43(2)}, editor = {Foundation of Rehabilitation Information,}, year = {2011}, abstract = {Objective: To identify candidate categories for International Classification of Functioning, Disability and Health (ICF) Core Sets for the reporting and measurement of functioning in patients in early post-acute rehabilitation facilities. Design: Prospective multi-centre cohort study. Patients: Patients receiving rehabilitation interventions for musculoskeletal, neurological or cardiopulmonary injury or disease in early post-acute rehabilitation facilities. Methods: Functioning was coded using the ICF. The criterion for selecting candidate categories for the ICF Core Sets was based on their ability to discriminate between patients with high or low functioning status. Discrimination was assessed using multivariable regression models, the independent variables being all of the ICF categories of the respective comprehensive ICF Core Set. Analogue ratings of overall functioning as reported by patients and health professionals were used as dependent variables. Results: A total of 165 patients were included in the study (67 neurological, 37 cardiopulmonary, 61 musculoskeletal), mean age 67.5 years, 46.1\% female. Selection yielded 38 categories for neurological, 32 for cardiopulmonary, and 31 for musculoskeletal. Conclusion: The present selection of categories can be considered an initial proposal, serving to identify the issues most relevant for the assessment and monitoring of functioning in patients undergoing early post-acute rehabilitation for neurological, cardiopulmonary, and musculoskeletal conditions.}, language = {en} } @article{RaboldBuchschmiedDusteretal.2010, author = {Rabold, Andreas and Buchschmied, M. and Duster, A. and M{\"u}ller, G. and Rank, E.}, title = {Modelling the excitation force of a standard tapping machine on lightweight floor structures}, series = {Journal of building acustics}, journal = {Journal of building acustics}, year = {2010}, abstract = {Up to now the research and development in the field of building acoustics is based mainly on measurements. In consequence the development and optimization of a new building component is a very tedious and expensive task. A considerable reduction of these costs could be achieved, if the optimization relying on measurements would be replaced - at least to some extent - by a computational prediction model. For these models it is necessary to represent not only the component and the adjacent rooms but also the excitation in a suitable way. This paper gives an overview of models for the excitation generated by a standard tapping machine taking into account the interaction between the impacting steel cylinders of the tapping machine and the vibrating surface of the floor.}, language = {en} } @article{GrillMuellerQuittanetal.2011, author = {Grill, E. and M{\"u}ller, Martin and Quittan, M. and Fialka-Moser, V. and Strobl, R. and Kostanjsek, N. and Stucki, G.}, title = {Brief ICF Core Sets for the acute hospital}, series = {Journal of Rehabilitation Medicine}, journal = {Journal of Rehabilitation Medicine}, editor = {Medical Journals Limited,}, year = {2011}, abstract = {Objective: To identify candidate categories for brief International Classification of Functioning, Disability and Health (ICF) Core Sets for the reporting and measurement of functioning in patients in the acute hospital. Design: Prospective multi-centre cohort study. Patients: Patients receiving rehabilitation interventions for musculoskeletal, neurological or cardiopulmonary injury or disease in acute hospitals. Methods: Functioning and contextual factors were coded using the ICF. The criterion for selecting candidate categories for the brief ICF Core Sets was based on their ability to discriminate between patients with high or low functioning status. Discrimination was assessed using multivariable regression models, the independent variables being all of the ICF categories of the respective comprehensive ICF Core Set. Analogue ratings of overall functioning as reported by patients and health professionals were used as dependent variables. Results: A total of 391 patients were included in the study (91 neurological, 109 cardiopulmonary, 191 musculoskeletal), mean age 63.4 years, 50.1\% female. Selection yielded 33 categories for neurological, 31 for cardiopulmonary, and 30 for musculoskeletal. Conclusion: The present selection of categories can be considered an initial proposal, serving to identify the ICF categories most relevant for the practical assessment and monitoring of functioning in patients with acute neurological, cardiopulmonary, and musculoskeletal conditions.}, language = {en} } @article{MuellerGrillQuittanetal.2011, author = {M{\"u}ller, Martin and Grill, E. and Quittan, M. and Strobl, R. and Kostanjsek, N. and Stucki, G.}, title = {ICF Core Set for patients in geriatric post-acute rehabilitation facilities}, series = {Journal of Rehabilitation Medicine}, journal = {Journal of Rehabilitation Medicine}, editor = {Medical Journals Limited,}, year = {2011}, abstract = {Objective: To identify candidate categories for International Classification of Functioning, Disability and Health (ICF) Core Sets for the reporting and clinical measurement of functioning in older patients in early post-acute rehabilitation facilities. Design: Prospective multi-centre cohort study. Patients: Older patients receiving rehabilitation interventions in early post-acute rehabilitation facilities. Methods: Functioning was coded using the ICF. The criterion for selecting candidate categories for the brief ICF Core Sets was based on their ability to discriminate between patients with high or low functioning status. Discrimination was assessed using multivariable regression models, the independent variables being all of the ICF categories of the respective comprehensive ICF Core Set. Analogue ratings of overall functioning as reported by patients and health professionals were used as dependent variables. Results: A total of 209 patients were included in the study, mean age 80.4 years, 67.0\% female. Selection yielded a total of 29 categories for the functioning part and 9 categories for the contextual part of the ICF. Conclusion: The present selection of categories can be considered an initial proposal, serving to identify the issues most relevant for the clinical assessment and monitoring of functioning in older patients undergoing early post-acute rehabilitation.}, language = {en} } @inproceedings{BuchschmidKohrmannWinteretal.2013, author = {Buchschmid, M. and Kohrmann, M. and Winter, C. and M{\"u}ller, G. and V{\"o}ltl, R. and Schanda, Ulrich}, title = {Vibroacoustic Characteristics of Light-Weighted Slabs. Part 2: Measurement-Based Investigation of the Sound Radiation of Suspended Ceilings}, series = {Deutsche Gesellschaft f{\"u}r Akustik e.V. (ed.), Fortschritte der Akustik - DAGA}, booktitle = {Deutsche Gesellschaft f{\"u}r Akustik e.V. (ed.), Fortschritte der Akustik - DAGA}, year = {2013}, abstract = {In this contribution a method for the prediction of the radiated sound out of the velocity field of a vibrating ceiling is presented. The numerical method was validated via measurements on a real structure using a pp-probe. It is based on Integral Transform techniques and can be applied in the postprocessing of a FEM simulation (harmonic analysis) [1]. The method was verified by measurements on the real structure and can be used for parametrical studies. Rounding off the Parts 1 and 2 of this publication nomograms, based on dimensionless parameters, can be developed to predict the sound radiation of light weight slabs. Hereby different sets of geometry as well as different configurations of ceilings can be studied in order to describe the acoustical and dynamical behaviour of wooden ceilings.}, language = {en} } @inproceedings{KohrmannBuchschmidGreimetal.2013, author = {Kohrmann, M. and Buchschmid, M. and Greim, A. and M{\"u}ller, G. and Schanda, Ulrich}, title = {Vibroacoustic Characteristics of lightweighted Slabs. Part 1: Aspects of Numerical Modeling, Model Updating and Parametric Studies using the Buckingham π -Theorem}, series = {Deutsche Gesellschaft f{\"u}r Akustik e.V. (ed.), AIA-DAGA}, booktitle = {Deutsche Gesellschaft f{\"u}r Akustik e.V. (ed.), AIA-DAGA}, year = {2013}, abstract = {In order to set up guidelines for the design of light-weighted ceilings for timber constructions to be used by engineers in practice, investigations based on both measurements and numerical models have been carried out [1, 2, 3]. The setup and the calibration of the numerical model of the structure are outlined briefly. A semi-analytical approach for the prediction of radiated sound is presented, which is based on Integral Transform Methods. The method can be applied in the post processing of a Finite Element computation. Thus as a first step the structure, consisting of a timber slab, a floating floor and a suspended ceiling, is built up in a Finite Element model, where the material properties of wood and the characteristics of the system are considered. The model is parameterized in order to enable computations with varying geometry and material parameters and calibrated with the help of measurements using model updating techniques. The velocity pattern resulting out of the FEM computation is transformed from the spatial into the wavenumber domain and from the time into the frequency domain using Fourier Transform Methods. Applying this velocity pattern as a boundary condition to the Helmholtz Equation, which results out of the Fourier Transform of the wave equation, the wavenumbers, which fulfil the radiation condition, can be selected and the pressure field in the adjacent acoustic fluid can be computed. Due to the properties of the Fourier-Transform the radiated sound power can be calculated efficiently in the transformed domain out of pressure and velocity. In a second part of the contribution the model for the air cushion in the suspended ceiling is discussed, where a FSI-model for the acoustic fluid and the structure is compared against engineering approaches using simplifications concerning mass distribution and transfer impedances between the individual nodes at the interface}, language = {en} } @inproceedings{KohrmannBuchschmidMuelleretal.2013, author = {Kohrmann, M. and Buchschmid, M. and M{\"u}ller, G. and V{\"o}ltl, R. and Schanda, Ulrich}, title = {Numerical models for the prediction of vibroacoustical characteristics of light-weighted ceilings}, series = {Internoise 2013}, booktitle = {Internoise 2013}, year = {2013}, abstract = {In order to set up guidelines for the design of light-weighted ceilings for timber constructions to be used by engineers in practice, investigations based on both measurements and numerical models have been carried out within the cooperative research project "VibWood". In this contribution the setup and the calibration of the numerical model of the structure as well as the prediction of radiated sound are discussed, where a special focus is set on a dimensionless description in order to deduce information for a wide range of system's specifications. The structure, consisting of a timber slab, a floating floor and a suspended ceiling, is built up in a Finite Element model, where the material properties of wood and the characteristics of the system (e.g.support conditions, contact phenomena dynamic properties of individual parts) are considered. The model is parameterized in order to enable computations with varying geometry and material parameters. After calibrating the FE-model with the help of measurements using model updating techniques dimensionless parameters are defined based on the Buckingham-π- Theorem and computations are carried out in order to specify guidelines for various systems. The radiation of sound is computed in a post processing using Integral Transform Methods.}, language = {en} } @inproceedings{MeckingVoeltlWinteretal.2014, author = {Mecking, S. and V{\"o}ltl, R. and Winter, C. and M., Buchschmid and Schanda, Ulrich and M{\"u}ller, G.}, title = {Methodenvergleich zur Bestimmung von Verlustfaktoren von Massivholzelementen}, series = {Deutsche Gesellschaft f{\"u}r Akustik e.V. (ed.), Fortschritte der Akustik - DAGA}, booktitle = {Deutsche Gesellschaft f{\"u}r Akustik e.V. (ed.), Fortschritte der Akustik - DAGA}, year = {2014}, abstract = {Die mithilfe der Abklingmethode ermittelten Verlustfaktoren sind bei mehreren Eigenfrequenzen pro Frequenzband zuverl{\"a}ssig. Die Ergebnisse der Resonanzbreitenmethode beziehen sich dagegen auf die Eigenfrequenzen und sind nur bei einer geringen Moden{\"u}berlappung zuverl{\"a}ssig. Beide Methoden sind gleichwertig, wenn mehrere Eigenschwingungen im Frequenzband vorhanden sind und die Moden{\"u}berlappung gleichzeitig gering ist. F{\"u}r einseitig {\"u}berlagerte Resonanzkurven wurde eine einfache Alternative der Resonanzbreitenmethode vorgeschlagen. Die Ergebnisse wurden im Rahmen des gemeinsam von der TU M{\"u}nchen, der HS Rosenheim und dem ift Rosenheim durchgef¨uhrten DFG-AiF Forschungsvorhabens "Vibroakustik im Planungsprozess f{\"u}r Holzbauten" erarbeitet. Das IGF-Vorhaben 17328N/1 der Forschungsvereinigung HS Rosenheim wurde {\"u}ber die AiF im Rahmen des Programms zur F{\"o}rderung der Industriellen Gemeinschaftsforschung (IGF) vom Bundesministerium f{\"u}r Wirtschaft und Energie aufgrund eines Beschlusses des Deutschen Bundestages gef{\"o}rdert.}, language = {de} } @inproceedings{WinterBuchschmidMeckingetal.2014, author = {Winter, C. and Buchschmid, M. and Mecking, S. and M{\"u}ller, G. and Schanda, Ulrich}, title = {Ein hybrider FEM/SEA Ansatz zur Prognose der Schall{\"u}bertragung an Bauteilst{\"o}ßen}, series = {Deutsche Gesellschaft f{\"u}r Akustik e.V. (ed.), Fortschritte der Akustik - DAGA}, booktitle = {Deutsche Gesellschaft f{\"u}r Akustik e.V. (ed.), Fortschritte der Akustik - DAGA}, year = {2014}, abstract = {Es wurden Stoßstellend{\"a}mm-Maße Kij f{\"u}r verschiedene Bauteilverbindungen von BSPH-Elementen gemessen. Diese zeigen eine gute {\"U}bereinstimmung zu anderen Werten aus der Literatur. Bei den Stoßstellen wurde der Einfluss von Elastomerlagern untersucht. Die Ergebnisse zeigen einen deutlichen Einfluss auf die Kij. Eine Berechnung der Kij mithilfe von Kopplungsverlustfaktoren ηij, welche aus einem SEAModell resultieren, zeigen eine ausreichende {\"U}bereinstimmung. Weitere Schritte der Modellierung zur {\"U}berpr{\"u}fung dieser Erkenntnisse und zur Abbildung von Elastomeren sind notwendig. Der Beitrag ist Teil des gemeinsam von der TU M{\"u}nchen, der HS Rosenheim und dem ift Rosenheim durchgef{\"u}hrten DFG-AiF Forschungsvorhabens Vibroakustik im Planungsprozess f{\"u}r Holzbauten. Das IGF-Vorhaben 17328 N/1 der Forschungsvereinigung HS Rosenheim wurde {\"u}ber die AiF im Rahmen des Programms zur F{\"o}rderung der Industriellen Gemeinschaftsforschung (IGF) vom Bundesministerium f{\"u}r Wirtschaft und Energie aufgrund eines Beschlusses des Deutschen Bundestages gef{\"o}rdert.}, language = {de} } @inproceedings{WinterBuchschmidWeineisenetal.2014, author = {Winter, C. and Buchschmid, M. and Weineisen, C. and M{\"u}ller, G. and Schanda, Ulrich}, title = {Modelling the Sound Transmission across Junctions of Building Components by Energy Influence Coefficients}, series = {European Association for Structural Dynamics (ed.), EURODYN}, booktitle = {European Association for Structural Dynamics (ed.), EURODYN}, year = {2014}, abstract = {A trend towards lightweight structures, e.g. timber structures, is noticeable in civil engineering, which implies the necessity to predict vibroacoustic characteristics like the transmission of structure-borne sound in order to fulfil requirements regarding serviceability. This contribution focuses on the investigation of junctions of building components e.g. between wall and ceiling. It is part of a joint research project with the aim to catalogue the coupling for a variety of junctions. The resulting database may serve to predict the transmission of structure-borne sound which is typically carried out either using a Finite Element (FEM) approach, suitable for the low frequency range, or by means of energy methods like the Statistical Energy Analysis (SEA) for the high frequency range. Therefore the so-called mid frequency gap emerges, which is examined and attempted to be closed. In this context SEA-averaging techniques are applied in the postprocessing of FEM calculations to obtain an adapted "SEAlike" approach. By varying the subsystems to be excited it is possible to determine Energy Influence Coefficients (EIC), which describe the specific energy content of the different subsystems with respect to the input power. Using this hybrid approach vibroacoustic predictions can be performed also in the mid frequency range. Inverting the EIC-matrix Coupling Loss Factors as well as Damping Loss Factors of the different subsystems can be calculated if the subsystem definition fulfils the SEA-requirements. The application of the method in combination to a classical SEA calculation and to laboratory measurements is presented.}, language = {en} } @inproceedings{VoeltlSchandaKohrmannetal.2013, author = {V{\"o}ltl, R. and Schanda, Ulrich and Kohrmann, M. and Buchschmid, M. and M{\"u}ller, G.}, title = {Simultaneous operational vibration analysis of different layers of lightweight timber floors}, series = {Internoise 2013}, booktitle = {Internoise 2013}, year = {2013}, abstract = {Within the scope of the research project "VibWood", operational vibration analyses of timber floor constructions were carried out. In order to understand the vibration behaviour of and the sound transmission through the layers of the constructions the coupling between them was investigated. The transfer function from the point of excitation to a pattern of receiving positions located on each of the layers of the construction was measured using a swept sine excitation. As a result, the frequency range of decoupling between the base floor and the floating floor and between the base floor and the suspended ceiling could be identified and the individual vibration behavior analyzed. The measurements also included the radiated sound power from the suspended ceiling. There is indication that there is not necessarily a correlation between the eigenmodes of the suspended ceiling and the maxima of the radiated sound power}, language = {en} } @inproceedings{VoeltlKohrmannSchandaetal.2012, author = {V{\"o}ltl, R. and Kohrmann, M. and Schanda, Ulrich and Buchschmid, M. and M{\"u}ller, G.}, title = {Messung und Berechnung der Schwingungen von Holzdecken im Pr{\"u}fstand}, series = {Deutsche Gesellschaft f{\"u}r Akustik e.V. DAGA}, booktitle = {Deutsche Gesellschaft f{\"u}r Akustik e.V. DAGA}, year = {2012}, abstract = {Im Rahmen des AIF-Forschungsprojektes VibWood werden im Deckenpr{\"u}fstand der HS Rosenheim unterschiedliche Holzdeckenkonstruktionen hinsichtlich ihres Schwingungsverhaltens im Bereich zwischen 4 Hz und 200 Hz untersucht. Parallel dazu werden diese Holzdeckenkonstruktionen an der TU M{\"u}nchen mittels FE-Berechnungen modelliert. F{\"u}r die Untersuchungen steht ein Pr{\"u}fstand zur Verf{\"u}gung, welcher die M{\"o}glichkeit bietet, Decken oder Deckenelemente mit Abmessungen von max. 5,5 m x 5,5 m auf einer Stahlwinkelkonsole aufzulagern. Die Deckenelemente k{\"o}nnen so durch Messung der {\"U}bertragungsfunktionen hinsichtlich ihrer Schwingungsformen untersucht werden. Ein Ziel der Untersuchungen ist es, die tieffrequenten Schwingungen von Holzdecken mit Hilfe von Schwingungstilgern deutlich zu reduzieren. Es werden erste Ergebnisse der Validierung der FE-Modelle vorgestellt, insbesondere der Einfluss der Auflagerung der Deckenelemente auf die {\"U}bertragungsfunktion. Weiterhin werden Messergebnisse f{\"u}r unterschiedliche Anregungsarten diskutiert}, language = {de} } @article{PetersDoringLadwigetal.2011, author = {Peters, A. and Doring, A. and Ladwig, K.-H. and Meisinger, C. and Linkohr, B. and Autenrieth, C. and Baumeister, S.E. and Behr, J. and Bergner, A. and Bickel, H. and Bidlingmaier, M. and Dias, A. and Emeny, R.T. and Fischer, B. and Grill, E. and Gorzelniak, L. and Hansch, H. and Heidbreder, S. and Heier, M. and Horsch, A. and Huber, D. and R. M., Huber and Jorres, R.A. and Kaab, S. and Karrasch, S. and Kirchberger, I. and Klug, G. and Kranz, B. and Kuch, B. and Lacruz, M.E. and Lang, O. and Mielck, A. and Nowak, D. and Perz, S. and Schneider, A. and Schulz, H. and M{\"u}ller, Martin and Seidl, H. and Strobl, R. and Thorand, B. and Wende, R. and Weidenhammer, W. and Zimmermann, A.-K. and Wichmann, H.-E. and Holle, R.}, title = {Multimorbidity and successful aging: the population-based KORA-Age study}, series = {Health and quality of life outcomes}, journal = {Health and quality of life outcomes}, editor = {BioMed Central,}, year = {2011}, abstract = {Background Multimorbidity in the older population is well acknowledged to negatively affect health-related quality of life (HRQL). Several studies have examined the independent effects of single diseases; however, little research has focused on interaction between diseases. The purpose of this study was to assess the impact of six self-reported major conditions and their combinations on HRQL measured by the EQ-5D. Methods The EQ-5D was administered in the population-based KORA-Age study of 4,565 Germans aged 65 years or older. A generalised additive regression model was used to assess the effects of chronic conditions on HRQL and to account for the nonlinear associations with age and body mass index (BMI). Disease interactions were identified by a forward variable selection method. Results The conditions with the greatest negative impact on the EQ-5D index were the history of a stroke (regression coefficient -11.3, p < 0.0001) and chronic bronchitis (regression coefficient -8.1, p < 0.0001). Patients with both diabetes and coronary disorders showed more impaired HRQL than could be expected from their separate effects (coefficient of interaction term -8.1, p < 0.0001). A synergistic effect on HRQL was also found for the combination of coronary disorders and stroke. The effect of BMI on the mean EQ-5D index was inverse U-shaped with a maximum at around 24.8 kg/m2. Conclusions There are important interactions between coronary problems, diabetes mellitus, and the history of a stroke that negatively affect HRQL in the older German population. Not only high but also low BMI is associated with impairments in health status.}, language = {en} } @article{WeitereAltenburgerAnlangeretal.2021, author = {Weitere, Markus and Altenburger, Rolf and Anlanger, Christine and Baborowski, Martina and B{\"a}rlund, Ilona and Beckers, Liza-Marie and Borchardt, Dietrich and Brack, Werner and Brase, Lisa and Busch, Wibke and Chatzinotas, Antonis and Deutschmann, Bj{\"o}rn and Eligehausen, Jens and Frank, Karin and Graeber, Daniel and Griebler, Christian and Hagemann, Jeske and Herzsprung, Peter and Hollert, Henner and Inostroza, Pedro A. and J{\"a}ger, Christoph G. and Kallies, Ren{\´e} and Kamjunke, Norbert and Karrasch, Bernhard and Kaschuba, Sigrid and Kaus, Andrew and Klauer, Bernd and Kn{\"o}ller, Kay and Koschorreck, Matthias and Krauss, Martin and Kunz, Julia V. and Kurz, Marie J. and Liess, Matthias and Mages, Margarete and M{\"u}ller, Christin and Muschket, Matthias and Musolff, Andreas and Norf, Helge and P{\"o}hlein, Florian and Reiber, Lena and Risse-Buhl, Ute and Schramm, Karl-Werner and Schmitt-Jansen, Mechthild and Schmitz, Markus and Strachauer, Ulrike and von T{\"u}mpling, Wolf and Weber, Nina and Wild, Romy and Wolf, Christine and Brauns, Mario}, title = {Disentangling multiple chemical and non-chemical stressors in a lotic ecosystem using a longitudinal approach}, series = {Science of the Total Environment}, volume = {769}, journal = {Science of the Total Environment}, pages = {144324}, year = {2021}, abstract = {Meeting ecological and water quality standards in lotic ecosystems is often failed due to multiple stressors. However, disentangling stressor effects and identifying relevant stressor-effect-relationships in complex environmental settings remain major challenges. By combining state-of-the-art methods from ecotoxicology and aquatic ecosystem analysis, we aimed here to disentangle the effects of multiple chemical and non-chemical stressors along a longitudinal land use gradient in a third-order river in Germany. We distinguished and evaluated four dominant stressor categories along this gradient: (1) Hydromorphological alterations: Flow diversity and substrate diversity correlated with the EU-Water Framework Directive based indicators for the quality element macroinvertebrates, which deteriorated at the transition from near-natural reference sites to urban sites. (2) Elevated nutrient levels and eutrophication: Low to moderate nutrient concentrations together with complete canopy cover at the reference sites correlated with low densities of benthic algae (biofilms). We found no more systematic relation of algal density with nutrient concentrations at the downstream sites, suggesting that limiting concentrations are exceeded already at moderate nutrient concentrations and reduced shading by riparian vegetation. (3) Elevated organic matter levels: Wastewater treatment plants (WWTP) and stormwater drainage systems were the primary sources of bioavailable dissolved organic carbon. Consequently, planktonic bacterial production and especially extracellular enzyme activity increased downstream of those effluents showing local peaks. (4) Micropollutants and toxicity-related stress: WWTPs were the predominant source of toxic stress, resulting in a rapid increase of the toxicity for invertebrates and algae with only one order of magnitude below the acute toxic levels. This toxicity correlates negatively with the contribution of invertebrate species being sensitive towards pesticides (SPEARpesticides index), probably contributing to the loss of biodiversity recorded in response to WWTP effluents. Our longitudinal approach highlights the potential of coordinated community efforts in supplementing established monitoring methods to tackle the complex phenomenon of multiple stress.}, language = {en} } @techreport{KohrmannVoeltlMuelleretal.2014, author = {Kohrmann, M. and V{\"o}ltl, R. and M{\"u}ller, G. and Schanda, Ulrich and Buchschmid, M.}, title = {Abschlussbericht zum AiF Forschungsvorhaben "VibWood". Planungshilfen zur schall- und schwingungstechnischen Beschreibung von Holzdecken und zur Bewertung und Dimensionierung von angepassen Schwingungsschutzsystemen}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-5235}, year = {2014}, language = {de} } @inproceedings{MuellerSchulzeIsenbergetal.2010, author = {M{\"u}ller, M. and Schulze, Achim and Isenberg, J. and Hund, B. and Beyer, H.-G.}, title = {Influence of the water resistivity on the temperature coeffizients of industrial silicon solar cells and on the expected performance behavior}, series = {Proceedings of the 25th EU-PVSEC}, booktitle = {Proceedings of the 25th EU-PVSEC}, year = {2010}, language = {en} } @article{LindnerMuellerBriesenetal.2021, author = {Lindner, Johannes A. and M{\"u}ller, M.G. and Briesen, H. and Foerst, P.}, title = {Monitoring temperature evolution and drying of coating on a single fluidized particle by infrared thermography}, series = {Powder Technology}, volume = {382}, journal = {Powder Technology}, pages = {331 -- 338}, year = {2021}, abstract = {Coating is an important step for the protection of drugs and flavors in the pharmaceutical and food industry. This paper presents a method for the experimental investigation of the coating process of a single freestream-fluidized particle by an infrared camera. The coating is dispersed by a nozzle with ultrasonic fluid atomization, allowing constant droplet size at different spray rates. The temperature of the fluidized particle was measured online by an infrared camera. The application of the coating on the particle in a spray cycle and the subsequent solvent vaporization is linked to the temperature and hence monitored during the whole coating process. The cyclic coating process of a Wurster coater is hence reproduced. The temperature evolution for different coating amounts in a single spray cycle, for different particle sizes, materials and temperature levels is monitored. A micro-computed tomography image shows the result of the levitator coating, giving a homogeneous layer.}, language = {en} }