This case study of a TPA adapted to a transient noise phenomenon shows very promising results when filtering out the significant parts of the time signals via triggering to a relevant body-side acceleration. The pure structure-borne approach proves to be valid when comparing synthesized and measured data. In the ranking of the paths the upper shock absorber connection to the body in vertical direction was clearly dominant. For the load case examined here the right top mount paths show higher partial pressures partly due to the different road profile for the right and left wheel, but also due to a higher vibro-acoustic sensitivity in the most relevant direction, the vertical one. A weakness in the vibro-acoustic transfer function can be further traced back to a weakness in the body stiffness in the frequency range of interest around 400 Hz. From four different shock absorbers the claimed one shows the highest force levels and subsequently the highest sound pressure levels. The other three types perform very similar and show an optimization potential on the excitation side of approximately 5..7 dB for that frequency range. Such a TPA study is a very useful tool to get quickly to the most promising design changes on the excitation but also on the receiver side for an all in all improved interior acoustic comfort.
TPA of transient chassis noise applied to shock absorber noise in a luxury coach
2013
7 Seiten, Bilder, 6 Quellen
Conference paper
English
Engineering Index Backfile | 1938
Engineering Index Backfile | 1938
Engineering Index Backfile | 1950
|Noise Path Analysis Process Evaluation of Automotive Shock Absorber Transient Noise
SAE Technical Papers | 2009
|Engineering Index Backfile | 1939
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