Vibro-Acoustic Characterisation of Lightweight Structures: A Numerical-Experimental Approach Katholieke Universiteit Leuven

Format:

Conference/Event

Author/Creator:

Jonckheere, Jonckheere, author.

Contributor:

Desmet, Wim

Pluymers, Bert

Vandepitte, Dirk

Vivolo, Marianna

Conference Name:

7th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference (2012-06-13 : Graz, Austria)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

In many industrial applications, such as in the automotive andmachine building industry, there is a continuous push towardslightweight materials motivated by material and energy savings.This increased use of lightweight materials, however, can stronglycompromise the Noise, Vibration and Harshness (NVH) performance ofthe final products. Especially in times where the NVH performancenot only receives a higher legislative attention, but also becomesa commercial differentiator, this also represents a key point ofattention for designers and directs research activities towards newexperimental and numerical techniques to accurately predict the NVHperformance of lightweight systems as early as possible in thedesign process.The presented work discusses novel measurement setup,specifically developed for examining the vibro-acoustic behavior oflightweight structures. The test stand consists of a concretecavity of 0.83 m₃. At its front wall, test specimens of variablesize and thickness can be inserted. This test setup allows applyingboth acoustic and structural excitation. Among others it allows theevaluation of vibro-acoustic Insertion Loss (IL) over a widefrequency range taking into account the effect of acoustic cavitymodal loading, as is often the case in real life applications ofthe tested materials such as for vehicle trimming.The particular shape of the cavity also allows for the use ofefficient simulation techniques for steady-state numericalanalysis. The Wave-Based Method (WBM) has shown a superiorcomputational efficiency as compared to the classical element-basedtechniques for problems of moderate geometric complexity, makingmid-frequency analysis feasible. The combination of the highlyefficient WBM and the novel test setup enables in situ materialcharacterization, both for internal acoustical problems as well asfor transmission cases

Notes:

Vendor supplied data

Publisher Number:

2012-01-1526

Access Restriction:

Restricted for use by site license