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Tuesday, July 9 • 11:10 - 11:30
IN-SITU CHARACTERIZATION OF A VIBRO-ACOUSTIC SUBDOMAIN

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For vibro-acoustic systems, such complex as a vehicle, modelling and understanding of acoustic transmission path are not straightforward tasks. Substructuring approaches can be very helpful for NVH engineers in different ways. The most interesting capabilities of substructuring approaches are (i) solving smaller sub-problems and (ii) mixing different modelling "solvers" (closed form solutions, numerical simulations or experiments). Therefore, using substructuring approach allows reaching higher frequencies or solving bigger systems and allows combining numerical and experimental descriptions of sub-problems. The latter point is particularly interesting when dealing with subdomains that remain difficult to model with numerical tools (assembly, trim, sandwich panels, porous materials, etc.). Impedance or mobility are at the basis of several substructuring methods like the Patch Transfer Functions (PTF) method. For this kind of methods, the (acoustic) impedance on the coupling surface characterizes the subdomain. This impedance is intrinsic of the subdomain and does not depend on the coupling to any other subdomain. The impedances are computed on "uncoupled" subdomains. This becomes problematic when one wants to obtain these impedances from measurements (a vehicle cabin cannot be uncoupled from the structure of the car for instance). The present works deals with a method developed to characterize the acoustic impedance of a passive subdomain directly using responses of the whole system (with coupled subdomains) and using an inverse approach. The theoretical background is presented and an original way to face ill-poseness of the problem is proposed. Finally, the method is validated on an experimental test case.

Moderators
LH

Lars Håkansson

professor, Linnaeus University
TK

Triantafillos Koukoulas

Dr, Korea Research Institute of Standards and Science

Authors

Tuesday July 9, 2019 11:10 - 11:30 EDT
Westmount 2
  T01 Ac. meas. & instrum., RS02 Measur techniq & sens