An accelerated editing method of multiaxial load spectrums for durability testing

Abstract

Fatigue load spectrum is the most critical part of the durability testing of automotive components. The multiaxial load spectrums input to the test bench generally need to be accelerated editing to reduce the test time. However, commonly used accelerated editing methods are limited to deleting small-amplitude load spectrum in a single channel and cannot meet the requirement of retaining damage characteristics or frequency-domain characteristics of the original load spectrum. For these reasons, the acceleration load spectrum may not adequately represent the actual damage to the tested components. Therefore, this paper proposes an accelerated editing method for multiaxial random load spectrums. The method compresses the load spectrums of multiple channels while considering the phase relationship between the different channels, reflecting the actual damage to the components. To verify the applicability of the proposed method, a test site acquisition scheme for multiaxial random load spectrums is designed. Subsequently performed accelerated editing for the obtained load spectrums. Finally, the accuracy of the proposed method was proved from the perspectives of the statistical domain, amplitude domain, and frequency domain, respectively.