Automotive exhaust hangers are small oval shaped elastomeric elements used to suspend the exhaust system including the muffler to the body of a vehicle. Specific knowledge of the stiffness and damping properties of these bushings are important to estimate the dynamic forces transmitted to the vehicle body in order to predict interior noise and vibration levels. Different methodologies to test and analyze the dynamic stiffness (K) and damping (C) properties of serveral silicone and EDPM rubber automobile exhaust hangers were investigated in this research. One test method utilized a standard MTS elastomer test machine with a single sine excitation at discrete frequencies and amplitude levels, while a second method utilized an electrodynamic shaker with broadband excitation. Analyses techniques for extracting the equivalent stiffness and damping were developed in the shaker tests using data from time domain, frequency domain, as well as force transmissibility. A comparison of all of the shaker testing methods for repeatability and accuracy was done with the goal of determining the appropriate method that generates the most accurate results over the range of testing. The shaker testing in the frequency domain using a frequency response function model produced the most repeatable and accurate results when compared with the results obtained from the MTS machine with a sine sweep.
Measurement of dynamic parameters of automotive exhaust hangers
Messung der dynamischen Parameter von Kraftfahrzeugauspuffaufhängungen
International Congress on Sound and Vibration, 7 ; 2979-2986
2000
8 Seiten, 7 Bilder, 2 Tabellen, 2 Quellen
Conference paper
English
Measurement of Dynamic Parameters of Automotive Exhaust Hangers
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