Abstract: The load spectrum edition method based on the wavelet transform to the vehicle components accelerated durability test is introduced. The majority of the fatigue damage are identified and extracted from the characteristic frequency bands in the load spectrum using the 12th order Daubechies wavelet. A compression load spectrum can be achieved by the organization of the extracted damage contribution parts. Taking the powertrain mount load spectrum as an example, the wavelet transform-based and damage retention-based edition method is performed to the lengthy load spectrum. The edited results show that the compression load spectrum based on the wavelet transform edition method has the similar statistical parameters including mean value, root mean square and kurtosis as well as the energy to the original load spectrum. The compression loading spectrum is equivalent to the original one. And wavelet transform-based load spectrum edition method can be used in the accelerated durability test research to other vehicle components.

Key words: Guangzhou 510641, South China University of Technology