FP 0702 Start date: 26/08/2008 End date: 22/08/2012 Year: 4 - - PowerPoint PPT Presentation

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European Cooperation in Science and Technology

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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

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Scientific context and objectives

• Increase

knowledge in the evaluation and prediction

• f

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?)

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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

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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

• n 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

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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

• f

lightweight constructions; identification

• f

relevant descriptors and frequency range

• Several WG meetings, in Biel, Brugge, Bordeaux and Bilbao
• 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

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• 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

Highlights in scientific results (2)

* proposals recommended by COST FP0702

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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

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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

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More about vibration

• Objectives: evaluation and prediction of walking induced vibration both
• n 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

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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.

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• 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)

Concluding remarks