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In this paper, we propose a combined methodology for the selection of distribution centres (DCs) by integrating and balancing economic, environmental and social sustainability aspects. The analytic network process (ANP) permits to systematically evaluate possible DCs on the basis of a situation-specific decision structure. A systematic development of the decision networks, which is one of the core challenges using the ANP, is supported by the process analysis method which we extend for that purpose. The validity and soundness of the proposed framework are demonstrated by means of a case study. The case study results reveal that omitting aspects of sustainability can lead to unfortunate results.
There are growing concerns in the food industry about how supply chains can be managed in a more sustainable way. When distribution activities are outsourced to a logistics service provider (LSP), shippers need to evaluate the LSPs they may (potentially) engage in order to ensure that supply chain sustainability goals are met. In this paper, we present a methodology for LSP evaluation and focus on the ecological dimension of sustainability. We examine how the network carbon footprint of a real-world distribution system is affected by the LSP network that is chosen to forward goods from production facilities to customers. To do this, we analyze the shipment data of an existing Fast Moving Consumer Goods (FMCG) manufacturer. A quantitative distribution network model is set up to study the network carbon footprint of 125 scenarios. Real-world shipments are forwarded via five generic, idealized types of LSP networks. In total, 625 network carbon footprints, specified by three distribution logistics variables and the structure of the LSP network, have been calculated. The results show that LSP structures practicing a geographically decentralized consolidation of shipments are most efficient in reducing of greenhouse gas (GHG) emissions. Furthermore, the effects of changing the manufacturer's and the LSP's strategies for deciding on the tonnage to be forwarded via the LSP network or moved by direct transports are quantified. Finally, we estimate the GHG effect of improving the capacity utilization of the vehicles that move the products.
This research studies effects that the average increase in travel times due to road traffic congestion has on characteristics of an existing distribution network. It presents the most detailed estimate of ‘on-the-road’ effects on distribution network characteristics up to now, from the network modelling perspective and from the processed data point of view. A concrete network model allowing for the representation of all relevant transportation flows is presented. The processed traffic information relies on navigation service data. The use of such data allows the requirements that arise for the traffic analysis of a whole distribution network to be met. It is shown that this data source may considerably contribute in forthcoming research. The effects of traffic congestion are quantified to get insights into the extent to which regular traffic congestion affects distribution network characteristics and to understand the mitigating effect when the number of distribution centres is increased.
Eine stetig gleichbleibende hohe Qualität zu fertigen, ist erklärtes Ziel des Spritzgießgewer-bes. Aus technischen oder wirtschaftlichen Gründen ist es jedoch nicht möglich, für konstan-te Produktionsrahmenbedingungen zu sorgen. Die effizienteste Methode ist , die Schwan-kungen über die Wahl der richtigen Prozessführungsmethode auszugleichen. Im ersten Teil der Arbeit konnte herausgefunden werden, welche praxisrelevanten Störgrö-ßen einen Einfluss auf den Spritzgießprozess haben und wie sie sich auswirken. Bei den Materialparametern sind Änderungen der Viskosität (15 %) und der Einfriertemperatur des Materials (4 °C) am Einzug festzustellen. Zusätzlich veränderte sich das Messverhalten der Drucksensoren, wodurch ein Drift von 5 bar entstand. Störgrößenbedingt änderten sich auch die Prozesstemperaturen um 1 °C. Im zweiten Teil der Arbeit werden diverse, während der Arbeit entwickelte, Prozessfüh-rungsmethoden miteinander verglichen. Aufgabe war es, die im ersten Teil gefundenen rea-len störgrößenbedingten Einflüsse zu kompensieren. Es stellte sich heraus, dass sich ledig-lich die materialbedingten Schwankungen nicht ausgleichen lassen. Zumindest können de-ren Auswirkungen durch eine Regelung der werkstoffnahen Parameter abschwächt werden.
Recent work with young adults has shown that, depending on study context access, selective memory retrieval can both impair and improve recall of other memories (Bäuml & Samenieh, 2010). Here, we investigated the 2 opposing effects of selective retrieval in older age. In Experiment 1, we examined 64 younger (20–35 years) and 64 older participants (above 60 years), and manipulated study context access using list-method directed forgetting. Whereas both age groups showed a detrimental effect of selective retrieval on to-be-remembered items, only younger but not older adults showed a beneficial effect on to-be-forgotten items. In Experiment 2, we examined 112 participants from a relatively wide age range (40–85 years), and manipulated study context access by varying the retention interval between study and test. Overall, a detrimental effect of selective retrieval arose when the retention interval was relatively short, but a beneficial effect when the retention interval was prolonged. Critically, the size of the beneficial but not the detrimental effect of retrieval decreased with age and this age-related decline was mediated by individuals’ working memory capacity, as measured by the complex operation span task. Together, the results suggest an age-related dissociation in retrieval dynamics, indicating an earlier decline of the beneficial than the detrimental effect of selective retrieval with older age. (APA PsycInfo Database Record (c) 2016 APA, all rights reserved)
Selective retrieval of some studied items can both impair and improve recall of the other items. This study examined the role of working memory capacity (WMC) for the two effects of memory retrieval. Participants studied an item list consisting of predefined target and nontarget items. After study of the list, half of the participants performed an imagination task supposed to induce a change in mental context, whereas the other half performed a counting task which does not induce such context change. Following presentation of a second list, memory for the original list's target items was tested, either with or without preceding retrieval of the list's nontarget items. Consistent with previous work, preceding nontarget retrieval impaired target recall in the absence of the context change, but improved target recall in its presence. In particular, there was a positive relationship between WMC and the beneficial, but not the detrimental effect of memory retrieval. On the basis of the view that the beneficial effect of memory retrieval reflects context-reactivation processes, the results indicate that individuals with higher WMC are better able to capitalise on retrieval-induced context reactivation than individuals with lower WMC.
Recent development of GaN power transistors with blocking voltages up to 650V enables novel power electronics applications with outstanding performance in high-frequency operation. This paper demonstrates a class E power amplifier with 13.56MHz switching frequency for inductively coupled DC power supplies. Continuous wave output power up to 200W is achieved with 95% Power Added Efficiency (PAE).
Forschungsbericht 2014
(2015)
Der ARIS Architect 9 der Software AG ist eines der weltweit führenden Prozessmodellierungstools. Lesern und Leserinnen dieses Buches werden das ARIS-Konzept und das praktische Arbeiten mit der Software vermittelt. Ziel ist es, das tägliche Arbeiten und einfache Projekte mit ARIS selbstständig erledigen zu können. Im Vordergrund steht die Modellierung und Modellauswertung. Neu in dieser Auflage ist die ausführliche Darstellung der Funktionen zur automatischen Modellanalyse und das Arbeiten mit BPMN 2.0. Zahlreiche Aufgaben und zwei umfangreiche Fallstudien (jeweils mit Lösungen) bieten eigenständige Übungsmöglichkeiten.
A method for integrated model-based safety analysis includes integrating a safety analysis model into a system development model of a safety-critical system. The system development model includes model components. The safety analysis model models a failure logic separately for each of the model components. The method includes representing dependencies among the model components with a design structure matrix. The design structure matrix represents each of the model components with a row and a column and shows dependencies between model components with corresponding entries. The method also includes sequencing the design structure matrix, and identifying at least one dependency loop and loop components in the sequenced design structure matrix. The loop components are part of the at least one dependency loop.
Electronic spectra of organic molecules doped into superfluid helium nanodroplets show characteristic features induced by the helium environment. Besides a solvent induced shift of the electronic transition frequency, in many cases, a spectral fine structure can be resolved for electronic and vibronic transitions which goes beyond the expected feature of a zero phonon line accompanied by a phonon wing as known from matrix isolation spectroscopy. The spectral shape of the zero phonon line and the helium induced phonon wing depends strongly on the dopant species. Phonon wings, for example, are reported ranging from single or multiple sharp transitions to broad (Δν > 100 cm−1) diffuse signals.
Despite the large number of example spectra in the literature, a quantitative understanding of the helium induced fine structure of the zero phonon line and the phonon wing is missing. Our approach is a systematic investigation of related molecular compounds, which may help to shed light on this key feature of microsolvation in superfluid helium droplets. This paper is part of a comparative study of the helium induced fine structure observed in electronic spectra of anthracene derivatives with particular emphasis on a spectrally sharp multiplet splitting at the electronic origin. In addition to previously discussed species, 9-cyanoanthracene and 9-chloroanthracene will be presented in this study for the first time.
We show experimentally that field-free one-dimensional (1D) alignment of 1,4-diiodobenzene molecules embedded in helium nanodroplets, induced by a single, linearly polarized 200-fs laser pulse, can be significantly enhanced by using two or four optimally synchronized laser pulses. The strongest degree of 1D alignment is obtained with four pulses and gives ⟨cos2θ⟩>0.60. Besides the immediate implications for molecular frame studies, our results pave the way for more general manipulation of rotational motion of molecules in He droplets.
In einem beispielhaften Pilotprojekt wird das ehemalige Kasernengelände bei Bad Aibling zur "Nullenergiestadt" saniert und modernisiert. Dabei beschäftigt sich das Projekt mit Fragen des energieeffizienten Bauens in Bestand und Neubau, sowie mit der ganzheitlichen Betrachtung von Gebäuden im Verbund zu Siedlungen, Kommunen und Städten.
Im Rahmen eines durch das BMWi geförderten Forschungsprojekts wird das Vorhaben wissenschaftlich begleitet. Die Hochschule Rosenheim übernimmt im Projekt das energetische Monitoring und dessen Auswertung. Neben dem Monitoring der Einzelgebäude ist dabei ein wesentlicher Bestandteil die Betrachtung eines niedrigtemperierten Nahwärmenetzes, das im Sommer ausschließlich über große Solarthermieflächen gespeist wird.
In diesem Low-Ex-Ansatz sind auch Innovationen wie die "Fassadenheizung", die Untersuchung dezentraler vs. zentraler Lüftungsanlagen in der Gebäudesanierung und die Planung höchst energieeffizienter Gebäude ein Thema.
In today’s business practice, but also in academic research the aspect of trust has gained remarkable importance. The usage of resources is still often pictured on a short perspective. Especially the usage of human resources must be sustainable, based on long term balance of interests and supported by procedures and systems that anchor the anabolic balance of interest between company and employee (Moldaschl,2008). Within the management of competencies, culture and values, the "social capital" in terms of an "asset of mutual trust" plays and important role. If the "homo reciprocans" feels to be treated fair his own willingness to cooperate increases (Falk, 2002). Furthermore "Trust in human relations is a binding framework under insecurity and allows decisions and actions that would not be possible based on pure rational information and consideration" (Strasser/ Voswinkel, 1997).
The question behind the research paper at hand is: "Is a culture of trust leading to higher employee competence utilization?" This is of relevance as "it is human capability and commitment that distinguishes successful organizations from the rest" (Storay, J. 2007), which is explicitly valid in times of skilled worker shortage. The purpose of this paper is to introduce a research approach to test the correlation between Trust and Employee Competence Utilization (ECU) ‐ embedded in a Business Excellence (BE) setting. Based on a short insight in the theoretical foundation of the basic model behind the empirical study and the subsequent operationalization of the variables the basic empirical methodology is described. With this the paper shows the process of focussing and bounding from the general theoretical relation of Trust and ECU to a specific research question and it’s correlating stepwise empirical approach.
The paper at hand gives detailed insights in the logic of planning of the empirical test methods as well as the development of the derived interview lines and questionnaires. The findings of this paper broaden the research focus towards the complexity of the two variables, trust and ECU, but simultaneously introduce and suggest an empirical approach to lighten the possibilities of measuring both variables. First empirical results underline the concrete tangible approach towards a focussed structural equation model. As a next step the empirical results will be analyzed in detail and finally pictured in a validated Structural Equation Model.
The purpose of this paper is to show how trust as an organizational value contributes to employee competence utilization in the case of innovation capability. Thus, it is the objective of this paper to analyze the positive impacts, but also potential limits of trust in business management. The research paper uses two different quantitative empirical studies drawn from German and Austrian midsized companies to empirically test this interrelation.
As a result, the paper determines particular aspects of trust such as accountability, shared norms and the ability to take responsibility to be interrelated with the usage of employee competences and underlines a positive connection between product innovation performance and trust. However, the trust concept needs enriching elements to be balanced towards a feeling of mutual reliance and support creativity instead; inclusions of bridging social capital, elements of distrust and a pioneering spirit are to be mentioned here.
Being of a particular character "trust" eludes a purely strategic approach as it has to be balanced with the special needs of a fragile human resource. Still trust is a resource of strategic relevance since it establishes security, reduces complexity and opens potentials being bigger than simply the reduction of "cost of control". These characteristics are of special interest for management, as competent action is always bound to problem-solving-abilities under circumstances of insecurity. Further to this there are numerous situations where control is not applicable and where we simply don’t have full knowledge. Also trust is particular as it bypasses financial efforts and grows through usage; an investment of high amortization though that deserves closer attention of management especially valid in times of skilled worker shortage and with respect to organizational learning as a valuable competitive advantage.
The purpose of this paper is to develop direct and indirect measurable on the impact of trust on employee competence utilization and its subsequent realization in a strategic scorecard approach. This is based on a new integrative model in the organizational context applicable for strategicmanagement. With this the objective of the paper is to answer the question if culture of trust is an adequate instrument for strategic management. The empirical evaluation of the model is based on a survey directed to employees of selected companies in a pragmatic mixed methods application. The selected view considers the trust level of employees with regard to management as another individual and the organization itself; personal and institutional trust mechanisms are affected.Thus the employee evaluates its management.
As a result, the empirical study suggests that it is possible to specify frameworks for the establishment of trust, and that its impact on competence utilization is moreover significant. However the concept of trust creates challenging requirements on managers. Based on the assumption that employees basically think and act in the sense of the company, benevolence and goodwill must be involved to avoid an opportunistic approach. Further to this accountability, shared norms and freedom to take responsibility need to be proven by behavior.
The allowance of constructive seriously taken criticism, problem solving attitude, the acceptance of decisions are further key points for trust supporting frameworks that have to be accepted and shown through behavior.
The consideration of company resources is initially oriented towards the question of whether the actual resources are adequate to achieve the defined goals. But with respect to human resources it is not only essential to choose the right employees but also to realize the potential of existing competencies.
Therefore it cannot simply be a monetary goal but also an immaterial cultural target to provide an atmosphere that allows the abilities of its organization to unfold. The assumption is made that a culture of trust is the adequate instrument to support employee competence utilization; an aspect being of special interest for strategic management.
Based on a new integrative model on the impact of trust on employee competence utilization a survey was directed to employees of selected medium sized organizations with between 49 and 999 employees. For the empirical study a pragmatic mixed methods approach was applied. The purpose of this paper is to test the basic hypothesis whether trust actually has an impact on employee competence utilization was tested with the use of correlation analysis and SmartPLS v. 3.2.3 in various ways. Therefore findings are based on the modelling and testing of trust relations and competence utilization.
As a result it can be summarized, that deliberate and elaborate concepts of social capital approaches, with a particular emphasis on trust, provide fundamental impact on and feedback through improved and increased employee performance.
Safety assurance is a major challenge in the design of today's complex embedded systems and future Cyber-physical systems. Especially changes in a system's architectural design invalidate former safety analyses and require an adaptation of related safety analysis models in order to restore consistency. In this work, we present an approach for automatically generating mappings between failure ports in compositional safety analysis models. This way, automatic and system-wide safety analyses are enabled that can be easily repeated after making modifications to the system's architecture. We demonstrate the feasibility of our approach using a case study from the automotive domain.
Safety assurance is a major challenge in the design of complex embedded and Cyber-physical Systems. Especially, changes and adoptions during the design or run-time of an embedded system invalidate former safety analyses and require an adaptation of the system's safety analysis models. In this paper, we present a methodology to fill up empty safety analysis artifacts in component fault trees using so-called inner port dependency traces to describe failure propagation. Thus, enabling a imprecise but rapid safety analysis of an entire system at early development stages or during system run-time for the automated certification of Cyber-physical Systems. We evaluate our approach using case study from the automotive domain.
Identifying drawbacks or insufficiencies in terms of safety is important also in early development stages of safety critical systems. In industry, development artefacts such as components or units, are often reused from existing artefacts to save time and costs. When development artefacts are reused, their existing safety analysis models are an important input for an early safety assessment for the new system, since they already provide a valid model. Component fault trees support such reuse strategies by a compositional horizontal approach. But current development strategies do not only divide systems horizontally, e.g., By encapsulating different functionality into separate components and hierarchies of components, but also vertically, e.g. Into software and hardware architecture layers. Current safety analysis methodologies, such as component fault trees, do not support such vertical layers. Therefore, we present here a methodology that is able to divide safety analysis models into different layers of a systems architecture. We use so called Architecture Layer Failure Dependencies to enable component fault trees on different layers of an architecture. These dependencies are then used to generate safety evidence for the entire system and over all different architecture layers. A case study applies the approach to hardware and software layers.
Flyer (Folder)
(2015)
Homepage (Website)
(2015)
With the increasing mechanization of buildings, it is necessary to be able to predict both the structure-borne sound power input from building machinery and the subsequent propagation of structure-borne sound in the building. This paper considers lightweight constructions and describes the results of an experimental study in the laboratory on a T-junction that was constructed from a timber joist floor and two double leaf timber-frame walls. The focus in this paper is on the vibrational behaviour of one of the timber-frame walls. To assess the vibration pattern and the propagation of structure-borne sound, the surface velocity levels were measured on a grid on both leaves of the wall with point force excitation on one side. This grid allowed calculation of structural intensity vectors. The influence of elements such as the timber studs and tongue and grooved joints between the boards were apparent in different frequency regions. Experimental modal analysis was carried out using measurements on both leaves of the wall, giving information about the coupling in different frequency regions. The results give insight into how such a timber-frame wall could be modelled using statistical energy analysis.
Verglichen mit Gebäuden in Mauerwerks- und Betonbauweise ist jedoch die Planung eines Bauobjektes in Holzbauweise für den Architekten und die Fachplaner eine deutlich größere Herausforderung.
Geeignete computergestützte Planungswerkzeuge, die eine Simulation der genannten bauphysikalischen und konstruktiven Eigenschaften bereits im frühen Planungsentwurf für das gesamte Bauwerk und nicht nur für einzelne Komponenten ermög-lichen, könnten den Planungsaufwand drastisch reduzieren.
Zur Prognose der Luft- und Trittschalldämmung nach EN 12354 wurde deshalb in einem aktuellen Gemeinschafts-Forschungsvorhabens zwischen der TU München, der Hochschule Rosenheim und dem ift Rosenheim eine SEA basierte Excel Anwendung erstellt, die die Besonderheiten des Holzmassivbaus berücksichtigt.
Die geometrischen Daten des Bauvorhabens sowie die Bauteilbezeichnungen können für die Prognose aus einem Bauwerkinformationsmodell (BIM) eingelesen werden.
Die Bauteilkennwerte und Stoßstellendämm-Maße werden aus einer separaten Bauteildatenbank ausgelesen, die innerhalb des Projekts durch Messungen aus verschiedenen Laboren gefüllt wird. Im Beitrag werden die Anwendung und der aktuelle Stand der Datenbank vorgestellt, sowie Vergleiche zwischen Messergebnissen am realen Objekt und der Prognoserechnung gezeigt.
SEA based prediction for integrated vibroacoustical design optimization of multi-storey buildings
(2015)
In order to enable the design of a multi-storey timbe
r building with respect to the requirements or
recommendations for an enhanced acoustic comfort, a c
ollaboration of various experts is required
during the design process creating their own indivi
dual building models.
A simplification of the
design process and the procedure of verification co
uld be achieved if all of the experts involved
work on one single CAD based Building Information Mo
del (BIM). The required design tools
(FEM and SEA for the acoustic computation) can be di
rectly coupled to the BIM.
For this
purpose, it is necessary to allocate much more valid
ated input data for timber building elements.
Der Wärmeschutz der äußeren Gebäudehülle ist wegen der zukünftig erforderlichen Energieeinsparungen stark in der öffentlichen Diskussion präsent und wird vom Gesetzgeber über Novellierungen der Energieeinsparverordnung flankiert.
Ein großes Potenzial hinsichtlich der Energieeinsparung steckt dabei in der Sanierung von Altbauten. Hier wird zur Verbesserung des Wärmeschutzes oftmals mit Wärmedämmverbundsystemen (WDVS) oder vorgehängten gedämmten Fassadenverkleidungen gearbeitet. Durch Aufbringen dieser Dämmsysteme wird auch die Schalldämmung der Außenwand beeinflusst.
In einem im Rahmen der Forschungsinitiative Zukunft Bau geförderten und beim ift Rosenheim durchgeführten Forschungsvorhaben [1] wurden Untersuchungen der Schalldämmung speziell an Dämmsystemen aus nachwachsenden Rohstoffen auf schweren, mittelschweren und leichten Massivwänden durchgeführt (Bild 1). Die akustische Wirksamkeit dieser Dämmsysteme wurde analysiert und mit Prognosemodellen verglichen. Ergebnisse aus diesem Forschungsprojekt werden in diesem Beitrag vorgestellt.
Der Einsatz von nachwachsenden Rohstoffen am Bau wird
öffentlich gefördert und entspricht den Wünschen vieler
Bauherren.
Bei der nachträglichen Außendämmung von Be-
standswänden können Holzbauer zwei Lösungen anbieten:
WDV-Systeme aus Holzfaserdämmplatten (einlagig) oder mit
hölzernen Unterkonstruktionen (zweilagig).
Letzteres kann
sowohl als Putzfassade auf Trägerplatten ausgeführt als auch
mit Vorhangfassade eine gestalterische Alternative bilden.
Gegenüber den bislang dominierenden WDVS aus EPS macht
es keinen Sinn in einen Preiskampf einzutreten. Holzbaulö-
sungen können nur verkauft werden über den Mehrwert,
den sie bieten können bei der Baustoffökologie, der Gestal-
tungsvielfalt, der Vorfertigung.
Auch bei der Bauphysik?
Ein Forschungsbericht des ift Rosenheim schließt hierzu eine
Wissenslücke beim Schallschutz.
Das Vorhaben untersuchte
die akustische Wirksamkeit von Dämmsystemen aus nach-
wachsenden Rohstoffen auf Massivwänden und hat daraus
Kennwerte für die Schallschutz-Prognose bei der Planung ab-
geleitet. Welcher Mehrwert hieraus zu erzielen ist, behandelt
dieser Beitrag.
Das Projektziel des VP 1.1 Holzlogistik im Spitzencluster BioEconomy bestand in der Entwicklung eines mesoskopischen Simulationsmodells.
Das Modell liefert aus strategischer Sicht den Akteuren der Holzbereitstellungskette, auf Basis von kosten- und leistungsrelevanten Systemvariablen, eine fundierte Entscheidungsgrundlage zur Gestaltung der Rohstoffbereitstellung von Buchenholz.
Den Herausforderungen des dreijährigen Forschungsprojekts stellte sich der Verbund aus den Unternehmen ante-holz GmBH & Co. KG, Eickelmann Transport und Logistik GmbH & Co. KG und den Wissenschaftlern der Hochschule Rosenheim, der Otto-von-Guericke-Universität Magdeburg und dem Fraunhofer IML.
Die ausschlaggebenden Größen einer dauerhaft funktionierenden Rohstoffbereitstellungslogistik für Buchenholz am Standort Rottelberode wurden im Projekt analysiert.
Nach der systematischen Aufbereitung relevanter kosten- und leistungsspezifischen Kenngrößen erfolgt die Implementierung der Prozesse in das Simulationsmodell.
Es gelang, die entlang der Wertschöpfungskette ablaufenden Prozesse, am Beispiel von Buchenholz transparent abzubilden und zu bewerten. Abschließend wurde das Simulationsmodell durch Expertenszenarien hinsichtlich seiner Praxistauglichkeit getestet.
Als Projektergebnis steht ein Demonstrator des Simulationsmodells zur Verfügung. Dieser kann entsprechend seiner Auslegung von Clustermitgliedern genutzt werden.
Lean Office
(2015)
Measured transmission functions from structure-borne sound sources in a timber-frame construction
(2015)
The aim of prEN 15657-2 is to provide engineering methods to estimate the structure-borne sound power input from machinery in situations where the source mobility matches or is lower than the receiver mobility. This situation often affects lightweight constructions such as timber-frame buildings. To estimate the sound pressure level in a room that is adjacent or distant from the room containing the source, the installed structure-borne sound power has to be propagated across at least one junction in the timber-frame construction. However, at present there are no generic, validated calculation models due to the complexity and the large variety of timber-frame constructions. A simplified approach to investigate and compare the structure-borne sound transmission is to treat the framed construction as a black box and only consider one parameter, a transmission function which is the ratio of the sound pressure level in the receiving room to the injected structure-borne sound power level. To get information about the variation of this transmission function in different timber-frame constructions, measurements were made in both the laboratory and the field. Experimental results are presented showing the variation due to different building configurations and the effect of the excitation position on the transmission function.
In den vergangenen Jahren hat der Holzbau auch im mehrgeschossigen Wohnungsbau an Bedeutung gewonnen. Zur Gewährleistung des Schallschutzes zwischen fremden Wohneinheiten sind Werkzeuge zur Berechnung der Schallübertragung in leichten Baustrukturen, wie zum Beispiel Holzrahmenbaukonstruktionen nötig. Solche Prognosemodelle müssen für Ingenieuranwendungen robust sein und auf abstrahierten, einfachen Rechenmodellen beruhen. Um die komplexen bertragungsmechanismen in solchen Rechenmodellen abbilden zu können, ist jedoch zunächst eine detaillierte Kenntnis des Schwingungs- und Körperschallverhaltens dieser Konstruktionen nötig. In diesem Beitrag werden Ergebnisse von Untersuchungen an einer konkreten Rahmenbaukonstruktion vorgestellt. Hierzu wurde im Labor für Schallmesstechnik an der Hochschule Rosenheim ein Leichtbauprüfstand errichtet. Grundlage für ein Prognosemodell könnten Berechnungsmethoden wie die Statistische Energieanalyse (SEA) darstellen. Um deren Anwendbarkeit zu prüfen, wurde die Verteilung der Körperschallenergie in einer Holzrahmenbauwand bei Anregung durch eine Punktquelle untersucht. Dabei wurde die Abnahme der Oberflächenschnelle mit steigendem Abstand zum Anregungspunkt sowie der Energiefluss in der Struktur mithilfe von Körperschallintensitäts-Messverfahren analysiert.