Appropriate Damping Loss Factor of Vehicle Interior Cavity for Valid Application of Statistical Energy Analysis

2020-01-1524

09/30/2020

Features
Event
11th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference
Authors Abstract
Content
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.
Meta TagsDetails
DOI
https://doi.org/10.4271/2020-01-1524
Pages
6
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.
Additional Details
Publisher
Published
Sep 30, 2020
Product Code
2020-01-1524
Content Type
Technical Paper
Language
English