Vibration Attenuation of Vehicle Exhaust Structures
Date Issued
2005
Date
2005
Author(s)
Hsieh, Hsin-Yun
DOI
zh-TW
Abstract
The exhaust structure system is the sub-system hung under the vehicle chassis. This sub-system may be considered rashly as a simple structure. If the structure system is arrayed unreasonably, the structure resonance or the concentration of vibration energy on local area will accrue, which will induce structure noise or damage of mountings components. Farther more the structure components may pound together and the ridding quality will be reduced. This paper proposed a dynamic analysis based optimization procedure to reduce the vibration level of the vehicle exhaust structure system.
At first, the FEM model with initial parameters is established, and then this parameter will be modified in accordance with the modal parameters which are identified form vibration test.
Secondly, the acceleration of the exhaust pipe on air vent section will be measured in car running test, and then converted into displacement spectrum used as input exciting spectrum. The frequency response functions of exhaust structure are determined by harmonic analysis using ANSYS. And then the dynamic response spectrum can be calculated.
Finally, the equivalent elastic modulus and the location of the suspension rubber can be optimized to achieve the minimum reaction forces of suspension rubber. So that the noise and vibration in the body transmitted from the exhaust system should be reduced to a minimum level.
Subjects
排氣管
有限元素分析
模態分析
最佳化設計
Exhaust Pipe
FEM
Modal analysis
Optimal design
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-94-R92525032-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):cc73e2e9b8b6fb7f67b50cbdda78d8fe