A theoretical model is made to investigate the coupling effects of the trim and air gap on the frequency response characteristics of a passenger compartment. With the model, a parametric study is carried out to understand the relation between the acoustic response of the cavity and the design variables associated with the roof, trim, and air gap between the two. The validity of theoretical formulations is verified through a comparison between the theoretical results and the finite element analysis results. Finally, an experiment for a simplified compartment cavity model is performed to confirm the theoretical results. This study reveals that the resonance peak level of an acoustic mode, which has a nodal surface parallel to the trim, can be significantly reduced by properly designing the trim mass and the gap thickness of the trim-air gap system. [S0739-3717(00)00303-2]

Issue Section:
Technical Papers
Keywords:
finite element analysis, structural acoustics, acoustic noise
Topics:
Acoustics, Roofs, Resonance, Design, Vehicles
1.
Sung
,
S. H.
, and
Nefske
,
D. J.
,
1984
, “
A Coupled Structural-acoustic Finite Element Model for Vehicle Interior Noise Analysis
,”
ASME Trans.
,
106
, No.
2
, pp.
314
–
318
.
2.
Yashiro, H., et al., 1985, “An Application of Structural-Acoustic Analysis to Car Body Structure,” SAE850961.
3.
Suzuki
,
S.
, et al.,
1990
, “
Coupling of Boundary Element Method for Vehicle Noise Problems
,”
JSME, NCA
,
9
, pp.
17
–
24
.
4.
Hagiwara
,
I.
, and
Ma
,
Z. D.
,
1992
, “
Sensitivity Calculation Method for Conducting Modal Frequency Response Analysis of Coupled Acoustic-Structural Systems
,”
JSME Int. J., Ser. III
,
35
, No.
1
, pp.
14
–
21
.
5.
Choi
,
K. K.
, and et al.,
1997
, “
Design Sensitivity Analysis of Structure-induced Noise and Vibration
,”
ASME J. Vibr. Acoust.
,
119
, No.
2
, pp.
173
–
179
.
6.
Kim
,
S. H.
, and
Lee
,
J. M.
,
1998
, “
A Practical Method for Noise Reduction in Vehicle Passenger Compartment
,”
J. Vibr. Acoust.
,
120
, No.
1
, pp.
199
–
205
.
7.
Osawa, T., and Iwama, A., 1986, “A Study of Vehicle Acoustic Control for Booming Noise Utilizing the Vibration Characteristics of Trunk Lid,” SAE861410.
8.
Lee, J. M., 1997, “Technical Development of Design of the Low-Noise and Low-Vibration Automotive Vehicle,” Research Report, Korea Automotive Technology Institute.
9.
Reynolds, D. D., 1981, Engineering Principles of Acoustics: Noise and Vibration Control, Allyn and Bacon Inc., Boston, pp. 333–344.
10.
Raff
,
J. A.
, and
Perry
,
R. D. H.
,
1973
, “
A Review of Vehicle Noise Studies Carried out at The Institute of Sound and Vibration Research with a Reference to Some Recent Research on Petrol Engine Noise
,”
J. Sound Vib.
,
28
, No.
3
, pp.
433
–
470
.
11.
Kim, S. H., Kang, S. W., and Lee, J. M., 1998, “Analysis on the Vibro-Acoustical Characteristics of a Panel-Cavity Coupled System,” submitted to J. Theoret. Appl. Mech.
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