@inproceedings{SeligerLeirich2025, author = {Seliger, Norbert and Leirich, Nico}, title = {Reconfigurable single-layer air coil inductor with bistable compliant windings}, series = {Proceedings EPE 25}, booktitle = {Proceedings EPE 25}, publisher = {EPE Association}, doi = {10.34746/epe2025-0012}, pages = {10}, year = {2025}, abstract = {We present an air coil with bistable compliant single layer windings. Due to stable elastic snapping deformation of wire segments, the self-inductance of the air coil can be precisely varied in multiple steps. A numerical and analytical design methodology is proposed and successfully validated by magneto-quasi-static field simulations and experiments on prototypes.}, language = {en} } @misc{SchoenauSchoenauDaumeetal.2024, author = {Sch{\"o}nau, Maximilian and Sch{\"o}nau, Elisabeth and Daume, Darwin and Panhuysen, Markus and Schulze, Achim and H{\"u}ttl, Bernd and Landes, Dieter}, title = {Improved Sampling of IV Measurements}, series = {Proceedings of the 41st EU PVSEC}, journal = {Proceedings of the 41st EU PVSEC}, publisher = {Proceedings of the 41st EU PVSEC}, doi = {10.4229/EUPVSEC2024/3AV.3.50}, pages = {3}, year = {2024}, abstract = {The measurement of IV curves is the most important characterization technique of photovoltaic devices. This work seeks to determine a fair sampling rate for IV curves. Traditional sampling methods, such as using equidistant voltage steps, result in biased data by over- and undersampling the measurement at different voltages, which affect critical evaluations such as maximum power point (MPP) determination as well as series and shunt resistance estimation. Therefore, an adaptive sampling approach based on calculating the arc length of the IV curve is proposed, aiming to distribute data points equidistantly along the curve. This method is intended to provide a more balanced representation of the measurement data across all segments of the curve. The results indicate that using this adaptive approach, the measurement points can be significantly reduced at lower voltages while maintaining essential data density at key characteristics such as the MPP, facilitating faster and more accurate assessments.}, language = {en} } @techreport{MeckingKruseWinteretal.2017, author = {Mecking, Simon and Kruse, Tobias and Winter, Christoph and Schanda, Ulrich}, title = {Vibroakustik im Planungsprozess f{\"u}r Holzbauten - Modellierung, numerische Simulation, Validierung, Teilprojekt 3: Parameterentwicklung und SEA-Modellierung, Schlussbericht}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-4861}, year = {2017}, abstract = {Auf Basis empirischer Daten wurde die Diffusit{\"a}t des K{\"o}rperschallfeldes von Brettsperrholz-Bauteilen in realistischer Gr{\"o}ße beschrieben und Verteilungssch{\"a}tzungen in Abh{\"a}ngigkeit der verwendeten Antwortanzahl durchgef{\"u}hrt. Ein n{\"a}herungsweise diffuses K{\"o}rperschallfeld liegt im Beispiel nur in einigen Terzb{\"a}ndern im mittleren Frequenzbereich vor. Damit ist eine Energiebestimmung mit wenigen Antwortpositionen nur dort m{\"o}glich. Die Energiebestimmung {\"u}ber die Schnelle ist bei tiefen Frequenzen f{\"u}r einige Frequenzb{\"a}nder ohne Moden nicht geeignet, da hier die Voraussetzung nicht gegeben ist, dass die kinetische gleich der potenziellen Energie ist. Hochfrequent hat der Krafteinleitungsort bezogen auf die Elementst{\"o}ße Einfluss auf die Antwortstreuungen. Dar{\"u}ber hinaus ist bei tiefen wie auch bei sehr hohen Frequenzen eine hohe Antwortanzahl notwendig.}, language = {de} } @techreport{BietzHuberMeckingetal.2020, author = {Bietz, Heinrich and Huber, Anton and Mecking, Simon and Rabold, Andreas and Schmelzer, Martin and Sgrieß, Daniel and Wittstock, Volker}, title = {Mehr als nur D{\"a}mmung - Zusatznutzen von D{\"a}mmstoffen aus nachwachsenden Rohstoffen (NawaRo-D{\"a}mmstoffe), Schlussbericht zum Arbeitsbereich 2 Schallschutz}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-31201}, pages = {397}, year = {2020}, abstract = {Der Arbeitsbereich 2 des Verbundvorhabens hatte als Ziel, die Anwendbarkeit von D{\"a}mmstoffen aus nachwachsenden Rohstoffen unter dem Aspekt des Schallschutzes deutlich zu erh{\"o}hen. Ein zentrales technisches Ergebnis des Projektes stellt der erweiterte Bauteilkatalog f{\"u}r Holzbauteile dar, der eine umfangreiche Sammlung an Planungsdaten bietet. Dieser wurde auf Basis der Analyse und Aufbereitung vorhandener Messdaten sowie der im Projekt durchgef{\"u}hrten Pr{\"u}fungen erstellt. Innerhalb des Projektes wurden • 45 Deckenaufbauten und • 10 Wandkonstruktionen hinsichtlich ihrer schalltechnischen Eigenschaften untersucht. Dabei wurden Holztafelkonstruktionen und Massivholzkonstruktionen ber{\"u}cksichtigt. Die ermittelten Werte zeigen, dass mit den Deckenaufbauten beim Einsatz von Holzfaser-Trittschalld{\"a}mmplatten sehr gute Ergebnisse erreichbar sind. Bei entsprechender Gesamtkonstruktion k{\"o}nnen somit auch mit steiferen NawaRo-D{\"a}mmplatten die Zielwerte f{\"u}r Trenndecken eingehalten werden. Neben der Entwicklung dieser speziell f{\"u}r NawaRo-D{\"a}mmstoffe optimierten Aufbauten, konnte f{\"u}r den gesamten Bauteilkatalog eine {\"O}ffnung f{\"u}r Hohlraumd{\"a}mmstoffe aus nachwachsenden Rohstoffen erreicht werden. NawaRo-D{\"a}mmstoffe zur Hohlraumd{\"a}mpfung sollten dabei einen l{\"a}ngenbezogenen Str{\"o}mungswiderstand zwischen 5 kPa s/m² und 50 kPa s/m² und eine offene Porosit{\"a}t gr{\"o}ßer als 0,9 (entspricht bei den meisten untersuchten D{\"a}mmstoffen etwa einer Rohdichte ≤ 130 kg/m³) aufweisen. Zus{\"a}tzliche Messungen mit h{\"o}herer fl{\"a}chenbezogener Masse der Unterdecke zeigten den positiven Einfluss von brandschutz-technisch erforderlichen Zusatzbeplankungen gerade bei den besonders interessierenden tiefen Frequenzen. Ein wissenschaftliches Ergebnis des Projektes ist in der Weiterentwicklung der Simulationsmodelle f{\"u}r die Schall{\"u}bertragung zu sehen. Hierzu konnten die semianalytischen Modelle f{\"u}r die Ber{\"u}cksichtigung der Materialeigenschaften unterschiedlicher Hohlraumd{\"a}mmstoffe erweitert werden. Als zweites Simulationsmodell wurde die Finite-Elemente-Methode f{\"u}r die Berechnung der Schalld{\"a}mmung eingesetzt. F{\"u}r die Simulation wurde ein Massivholz-Wandelement mit W{\"a}rmed{\"a}mm-Verbund-System als Außenwand modelliert. Diese Außenwandkonstruktion ist von besonderem Interesse, da sie im mehrgeschossigen Wohnungsbau gerne verwendet wird, aber sowohl im Brandschutz als auch im Schallschutz noch Optimierungsbedarf aufweist.}, language = {de} } @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{KrommesHuberPschereretal.2025, author = {Krommes, Sandra and Huber, Gretel and Pscherer, Theresa and Nemeth, Isabell}, title = {Circular economy in life cycle costing: a literature review in the construction sector}, series = {Journal of Physics: Conference Series}, booktitle = {Journal of Physics: Conference Series}, publisher = {IOP Science}, doi = {10.1088/1742-6596/3140/13/132012}, pages = {1 -- 7}, year = {2025}, abstract = {Circular economy (CE) has become important in reducing the environmental impact of the construction sector. For the transformation from linear to CE, decision support tools and methods are needed to assess and promote CE for constructions. With regard to sustainable financial decisions, life cycle costing (LCC) is the preferred method. However, the LCC approaches and their application in CE research differ. Based on a systematic literature review, the relevance of refurbishment in operation, reuse, recycling and disposal at end-of-life (EoL) in LCC is assessed. As a result, LCC has gained relevance in the construction sector, but CE plays a subordinate role in LCC applications. Costs or benefits of CE are often neglected. However, some research have shown that refurbishment as well as reuse and recycling can outweigh higher initial cost over lifetime. The internalisation of environmental and social impacts or even benefits are also rare. In particular, there is a lack of research on how to internalise the environmental benefits of refurbishment, reuse and recycling or how to effectively incentivise higher CE efforts in LCC in order to encourage decision-making in construction towards CE.}, language = {en} } @article{MoroneVieiraLangeetal.2026, author = {Morone, Piergiuseppe and Vieira, Helena and Lange, Lene and Meer, Yvonne Van der and Penttil{\"a}, Merja and Dragicevic, Arnaud and Koukios, Emmanuel and Krommes, Sandra and Alvarino Pereira, Teresa and Vincevica-Gaile, Zane and Vidarsson, Jonas and Zorpas, Antonis A. and Zimmermannova, Jarmilla and Zimniewska, Malgorzata and O'Connor, Kevin E.}, title = {The European Bioeconomy strategy revision: an opportunity to go against the tide and secure a sustainable future}, series = {Cleaner and Circular Bioeconomy}, volume = {13}, journal = {Cleaner and Circular Bioeconomy}, number = {100204}, publisher = {Elsevier}, address = {Cleaner and Circular Bioeconomy}, doi = {10.1016/j.clcb.2026.100204}, pages = {1 -- 9}, year = {2026}, abstract = {In today's tense geopolitical landscape, marked by strained relations among major powers and deep-rooted dependence on fossil-based economies, the emerging modern bioeconomy can provide resource independence and resilience, in tandem with economic, social, and environmental benefits, and thus has the potential to underpin a sustainable future. The bioeconomy is a vital cross-cutting meta-sector, but it is not inherently circular or sustainable; without intentional design, it risks becoming a linear, unsustainable replacement of the fossil-based economy. Realising its full promise requires purposeful engineering to address climate change, biodiversity loss, strengthen resource independence, support food security and resilience, create jobs, promote social inclusion, boost competitiveness and autonomy, and improve human, animal, and environmental health. The potential is enormous, but so are the challenges society faces in realising the vision for a biobased, nature-positive future.}, language = {en} } @misc{MeckingScheibengraberKruseetal.2017, author = {Mecking, Simon and Scheibengraber, Markus and Kruse, Tobias and Schanda, Ulrich and Wellisch, Ulrich}, title = {Experimentally based statistical analysis of the vibrational energy of CLT building elements}, series = {24th International Congress on Sound and Vibration, ICSV24, London, United Kingdom, July 2017}, journal = {24th International Congress on Sound and Vibration, ICSV24, London, United Kingdom, July 2017}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-4883}, year = {2017}, abstract = {The method is based on a simplified Statistical Energy Analysis(SEA) approach. The energy ratios of various subsystems are the main quantities to predict sound transmission. The method has proven to work sufficiently accurate for masonry and concrete buildings, where the building components like walls, floors etc. can be regarded as rather homogeneous structures. To adapt this method for solid timber constructions it is necessary to prove that basic SEA requirements are fullfilled by orthotropic materials and heterogeneous structures that occur in these building types. In a case study, an isolated T-junction formed by Cross Laminated Timber(CLT) elements is experimentally investigated. The buildings elements are subdivided in segments with typical screwed connections. In the experiments the diffusivity of the vibration field is investigated, using point excitation with a shaker at several positions and many, randomly chosen response positions. MONTE-CARLO simulations are conducted for random but fix-sized subsets of the measured response positions to find the necessary number of response positions for an accurate determination of the vibrational energy. As a result the distribution of the mean velocity levels can be approximated. In a second approach a multiple linear regression model based on the least absolute shrinkage and selection operator(LASSO)is applied, because for lower frequency bands multicollinearity is expected. In the context of linear regression modelling, data-driven methods are used to select optimal subsets of response positions, to get an estimating equation.}, language = {en} } @misc{TimpteMeckingSchandaetal.2017, author = {Timpte, A. and Mecking, S. and Schanda, Ulrich and Rabold, A.}, title = {Vibration reduction indices of CLT junctions}, series = {Proceedings of ICSV24}, journal = {Proceedings of ICSV24}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-4982}, year = {2017}, abstract = {The multi-disciplinary research project "Vibroacoustic analysis in the planning process of timber constructions" carried out in cooperation between the University of Applied Sciences Rosenheim, the ift Rosenheim and the Technical University Munich is a comprehensive study of direct as well as flanking structure-borne and airborne sound insulation of Cross Laminated Timber (CLT) elements and their junctions. The aim is to optimize and simplify the acoustical planning process of wooden multi-storey buildings and thereby to contribute to the increase growth of timber construction industry in Europe. For a prediction of the acoustical performance of solid wood constructions, the vibration reduction index Kij is needed. The vibration reduction index can be determined i.a. of the direction-averaged junction velocity level difference and the structural reverberation time. Both quantities need to be measured according to EN ISO 10848. Alternatively, vibration reduction indices for a T- or cross-junction can be derived following the procedures described in prEN ISO 12354-1:2016. However, further knowledge and data of the sound transmission across junctions of CLT is inevitable for a reliable prediction. In this paper a collection of frequency dependent vibration reduction indices for CLT structures will be presented and compared, involving L-, T- and cross-junctions measured by six international laboratories.}, language = {en} } @misc{TimpteMeckingSchandaetal.2017, author = {Timpte, A. and Mecking, S. and Schanda, Ulrich and Rabold, A.}, title = {Stoßstellend{\"a}mm-Maße von Brettsperrholzkonstruktionen}, series = {Deutsche Gesellschaft f{\"u}r Akustik e.V. (ed.), Fortschritte der Akustik - DAGA}, journal = {Deutsche Gesellschaft f{\"u}r Akustik e.V. (ed.), Fortschritte der Akustik - DAGA}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-4979}, year = {2017}, abstract = {Ein Ziel des DFG-AiF-Clusterforschungsvorhabens Vibroakustik im Planungsprozess f{\"u}r Holzbauten ist die Reduktion des schalltechnischen Planungsaufwandes bei der Massivholzbauweise. Hierzu soll das Prognoseverfahren der DIN EN 12354 zur Ermittlung der Flanken{\"u}bertragung f{\"u}r Holzbaukonstruktionen angepasst werden. Da es sich bei der Massivholzbauweise um keine starre Verbindungen wie beim Massivbau handelt, ist zur Berechnung der Flanken{\"u}bertragung ein Maß f{\"u}r die Schall{\"u}bertragung an den Stoßstellen erforderlich. Das sogenannte Stoßstellend{\"a}mm-Maß Kij wird u.a. aus der richtungsgemittelten Differenz der Schnellepegel je Bauteil und der K{\"o}rperschallnachhallzeit gebildet, welche nach der DIN EN ISO 10848 messtechnisch zu ermitteln sind. Alternativ wird im Entwurf E DIN EN 12354-1:2016 ein erster Vorschlag zur Berechnung des Stoßstellend{\"a}mm-Maßes f{\"u}r einen T- und einen Kreuz-Stoß in Brettsperrholz aufgef{\"u}hrt. In diesem Beitrag werden Stoßstellend{\"a}mm-Maße unterschiedlich ausgef{\"u}hrter Brettsperrholzkonstruktionen pr{\"a}sentiert und gegen{\"u}bergestellt. Es handelt sich um frequenzabh{\"a}ngige Werte, die von internationalen Laboren gem{\"a}ß DIN EN 10848 f{\"u}r L-, T- und Kreuz-St{\"o}ße ermittelt wurden.}, language = {de} } @misc{MeckingKruseSchanda2015, author = {Mecking, S. and Kruse, T. and Schanda, Ulrich}, title = {Measurement and calculation of sound transmission across junctions of solid timber building elements.}, series = {Proceedings of Euronoise 2015}, journal = {Proceedings of Euronoise 2015}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-5118}, year = {2015}, abstract = {Extended Abstract: The number of multi-storey buildings in timber construction increases continuously. Compared to concrete and brick constructions the planning process of sound insulation of a wooden building causes much higher effort. Reasons are missing planning data and planning tools for sound insulation. Suitable, computer-based tools, which enable a simulation already in an early planning phase of a building, could help to reduce the planning effort significantly. One possibility to calculate the in-situ airborne and impact sound insulation is to combine the Finite Element Method (FEM) and the Statistical Energy Analysis (SEA) in a coupled model, which consider the direct transmission path of the building elements and the flanking transmission paths. The SEA-based calculation of the sound insulation according to EN 12354 requires the vibration reduction indices of the transfer paths at a junction of structural elements. This paper shows actual measurement results of the Operational Vibration Analysis and the vibration reduction indices of coupled Cross Laminated Timber elements. In the process the elastic layers, the pressure and the fasteners were diversified. In addition the modelling of the junction by using a commercial SEA tool will be presented and the comparison of the calculated with the measured results. From this comparison conclusion about the valid frequency domain for the Statistical Energy Analysis will be presented. The results are based on the current status of the research project "Vibroakustik im Planungsprozess f{\"u}r Holzbauten" funded by the German Research Foundation (DFG) and German Federation of Industrial Research Associations (AIF). It is carried out by Technical University Munich, ift Rosenheim and University of Applied Sciences Rosenheim}, language = {en} }