Appropriate Damping Loss Factor of Vehicle Interior Cavity for Valid Application of Statistical Energy Analysis 2020-01-1524
It is known that SEA is a rapid and simple methodology for analyzing complex vibroacoustic systems. However, the SEA principle is not always valid and one has to be careful about the physical conditions at which the SEA principle is acceptable. In this study, the appropriate damping loss factor of the vehicle interior cavity is studied in the viewpoint of the modal overlap factor of the cavity and the decay per mean free path (DMFP) of the cavity. Virtual SEA tests are performed with an FE model combination, which is suggested by a previous study of Stelzer et al. for the simulation of the sound transmission loss (STL) of vehicle panel structure. The FE model combination is consisting of the body in white (BIW), an acoustical-excited hemisphere-shaped exterior cavity, and the interior cavity. It is found that the DMFP of the interior cavity is appropriate between 0.5 ~ 1 dB for applying SEA principle. The DMFPs which are measured at several vehicles’ interior compartments are observed between 1 dB ~ 2.5 dB, and it means that it is not far away from SEA-applicable damping values.
Citation: Chae, K. and Oh, B., "Appropriate Damping Loss Factor of Vehicle Interior Cavity for Valid Application of Statistical Energy Analysis," SAE Technical Paper 2020-01-1524, 2020, https://doi.org/10.4271/2020-01-1524. Download Citation
Author(s):
Ki-Sang Chae, Byung Young Oh
Affiliated:
Hyundai Motor Company
Pages: 6
Event:
11th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Design processes
Finite element analysis
Research and development
Simulation and modeling
Interiors, Cabins, and Cockpits
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