European Cooperation in Science and Technology www.cost.eu Net-Acoustics for timber based lightweight buildings and elements FP 0702 Start date: 26/08/2008 End date: 22/08/2012 Year: 4 Michel Villot & Eddy Gerretsen CSTB, Action Chair TNO, WG1 Convener COST is supported by ESF provides the the EU RTD Framework Programme COST Office through an EC contract
Scientific context and objectives • Increase knowledge in the evaluation and prediction of the performances of timber based lightweight constructions: - acoustic performance, including low frequencies down to 50 Hz - vibration performance, especially walking induced vibration below 25 Hz • Cooperate with European standardization Committees in order to bring results to standardization - measuring methods for noise (ISO 140 parts) - prediction methods for noise (EN 12354) - relevant quantities for vibration (Eurocodes?) COST is supported by ESF provides the 2 the EU RTD Framework Programme COST Office through an EC contract
Action Parties COST Countries: AT, BE, CH, DE, DK, ES, FR, GB, IE, LT, NL, NO, SE Non-COST countries : AU, NZ Grant Holder: Lund University, Sweden COST is supported by ESF provides the 3 the EU RTD Framework Programme COST Office through an EC contract
Working groups 1. Working group 1 (E. Gerretsen, NL): adapt methods predicting acoustic and vibration building performances from the performance of elements, to lightweight constructions 2. Working group 2 (D. Bard, SE): adapt measuring methods (field and lab) to timber based lightweight buildings and elements, with emphasis on the low frequency range and relevant impact sources 3. Working group 3 (B. Zhang, UK, B. Rasmussen, DK): rate annoyance associated with sound (down to typically 50 Hz) and low frequency vibration (typically < 25 Hz) ; possible need of specific descriptors for lightweight buildings 4. Working group 4 (B. Ingelaere, BE): gathering and categorizing main timber based lightweight building types in Europe, making sure these types are considered by other WGs COST is supported by ESF provides the 4 the EU RTD Framework Programme COST Office through an EC contract
Highlights in scientific results (1) • Workshop in Vaxjo (SE), May 2009, with various presentations clearly stating the problems to be solved and the ongoing research • Workshop in Delft (NL), November 2010, with presentation on action scientific objectives: evaluation and prediction of sound and vibration performances of lightweight constructions; identification of relevant descriptors and frequency range • Several WG meetings , in B iel, B rugge, B ordeaux and B ilbao • STSM’s performed on descriptors for floor impact noise and low frequency vibration, as well as on acoustic prediction and measurements • Workshop in Zürich (CH), November 2011, for both Actions FP0702 and TU0901 COST is supported by ESF provides the 5 the EU RTD Framework Programme COST Office through an EC contract
Highlights in scientific results (2) • numerous studies performed by members at national level: - at TNO (NL): study of junctions of lightweight elements; analytical and numerical tools for structural vibration - Lulea University (SE): model for impact sound in timber buildings - Liverpool University *(GB): transient SEA model for impact sources - CSTB *(FR): field validation of method predicting sound insulation in timber buildings; study of service equipment installed in timber structures - PTB (DE): study of service equipment installed in timber structures - BBRI (BE): building guidelines for timber constructions; junctions of timber elements with resilient joints - SINTEF (NO): work on long span timber floors and cross-laminated timber building elements - EMPA *(CH): new lab facilities to characterize junctions of timber elements * proposals recommended by COST FP0702 COST is supported by ESF provides the 6 the EU RTD Framework Programme COST Office through an EC contract
Expected results (1) • WG1: proposal for acoustic prediction (down to 50 Hz) and for vibration prediction (below 25 Hz) are being drafted. acoustic prediction model to be discussed in CEN/TC126/WG2 (February 2012) • WG2: proposal for acoustic measurement method down to 50 Hz procedures for measuring (lighweight) junctions and radiation efficiencies procedures for measuring relevant vibration parameters including damping COST is supported by ESF provides the 7 the EU RTD Framework Programme COST Office through an EC contract
Expected results (2) • WG3: review of current regulations and standards summary table of descriptors assessment methods for low frequency sound and vibration comfort • WG4: catalogue of construction details and building elements with their performances COST is supported by ESF provides the 8 the EU RTD Framework Programme COST Office through an EC contract
More about vibration • Objectives: evaluation and prediction of walking induced vibration both on the excited floor and on neighboring floors • Evaluation of excited floor (best for time being): - floor fundamental frequency - unit force deflection - damping through unit impulse response or other quantities (also valid for evaluating neighboring floors ) • Need for well defined measurement methods • Prediction through FEM calculation: simplified procedure proposed to model junctions between elements with correct boundary conditions COST is supported by ESF provides the 9 the EU RTD Framework Programme COST Office through an EC contract
Links with TU0901 • TU0901 covers all types of buildings FP0702 covers only timber based lightweight buildings • FP0702 must consider low frequency sound (<100 Hz) and vibration (<25 Hz) low frequency sound is a common interest with TU0901 • FP0702 focuses on predicting and measuring vibration and sound, also at low frequencies • TU0901 focuses on universal sound descriptors and classification • Both actions collect typical designs and performance data for buildings to illustrate effects and demonstrate possibilities. COST is supported by ESF provides the 10 the EU RTD Framework Programme COST Office through an EC contract
Concluding remarks • So far, no significant deviations from the work plan • Vibration: need for good descriptor and well defined measurement methods • Low frequency sound: need for perceptive studies to identify proper descriptors and frequency range • Collect relevant examples with performance data (low frequency sound and vibration), in collaboration with TU 0901 • Final conference in autumn 2012 in Grenoble (FR) COST is supported by ESF provides the 11 the EU RTD Framework Programme COST Office through an EC contract
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