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The prediction of sound-fields in closed volumes with vibrating delimiting surfaces is typically carried out by the use of energy methods. Those methods are robust for subsystems with high modal densi-ty, if the averaging over frequency bands, points of excitation and points of observation is carried out. However their performance is limited if the spatial resolution of the response has to be described and if boundary conditions are investigated more in detail. They fail when impulse responses shall be calculated. By the use of the Finite Element Method (FEM) for the coupled fluid-structure system those deficits would theoretically be eliminated; however this requires extensive calculations and leads to non robust results in case no averaging is done in the post-processing. Considering the fact, that for many applications a limited frequency range is of interest and that the development of the FEM is continuously progressing, the research project 2-5 deals with a systematic procedure to calculate frequency-response functions (FRF) and impulse response functions in room-acoustics by means of the FEM. The method is based on a modal approach for the fluid, using the component mode syn-thesis to reduce the effort of calculation, in case design changes should be studied. For simple geo-metries – which often occur in civil engineering - the modes can be found by closed form solutions. Free interface eigenmodes or wave number approaches are used at the coupling interface to model the deformation pattern. In addition, focus is laid on the description of various absorbers. Whereas plate-resonators are described by wave number- or local impedances, porous absorbers are modeled by the help of the Theory of Porous Media (TPM). The results of the modeling are compared with results of industrial applications and applications in civil engineering where reradiated sound plays an important role.

01-01-1970
IGSSE setup of interdisciplinary research in project teams
16.05.17

Apply now: 12th call for proposals

IGSSE supports up to 10 new project teams

Call closes 2 July 2017

11.06.17

Apply now: IGSSE travel grant for ICCE 2017

28-29 September 2017, TU Darmstadt

Submission deadline for abstracts: 18 June 2017

08.06.17

IGSSE Forum 2017

29-31 May 2017, TUM Science and Study Center Raitenhaslach, Burghausen

14.05.17

Climate-KIC: Join the PhD Catapult

Two-week thematic summer schools across Europe

04.05.17

IAS Symposium: Selected topics in science and technology

8-10 May 2017, IAS Building, Garching Campus

02.05.17

IAS Coffee Talk with PTL Florian Praetorius

3 May 2017, 1 pm, TUM IAS Building, Garching Campus

23.02.16

10th IGSSE Forum

1 - 4 June 2016, TUM Science and Study Center, Burghausen

05.06.16

10th IGSSE Forum

Smart cooperation - science and technology in, with and for society

15.12.15

The Science of Cooking

Doctoral Candidates explore the Secrets of a great Dinner

26.11.15

ATUMS@IGSSE

Having heard of a great Canadian Kick-Off Meeting, everyone at IGSSE was thrilled to welcome the...

20.11.15

Breakfast at IGSSE´s

Meet the IGSSE team every other month! All the things IGSSE members wanted to asked but never dared...

13.10.15

Save the Date: Canadian ATUMS Speaker on "Global Science- Global Career"

26. November 2015, 6-8 pm, IAS Faculty Club, Garching Campus

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Friday, 09. June 2017
Workshop: Standing up for science
9 June 2017, 9am-4pm, Brussels
Apply now: McKinsey 'Forschergeist' symposium
9-11 June 2017, Berlin For doctoral researchers and postdocs!