Research on Compilation Method of Load Spectrum for Cylindrical Shock Absorber Durability Test  
Author Jinzhi Feng

 
Co-Author(s) Qi Gao; Songlin Zheng

 
Abstract The field data of taxis collected from a certain area in China shows that the main failure mode of the cylindrical shock absorber (CSA) is oil leakage because of the large vertical and lateral force of the area. Therefore, it is necessary to simulate the actual service condition by the bench test and study the fatigue of the CSA. This paper proposes a new compilation method of load spectrum for CSA durability test. Firstly, the road spectrum is collected by a test taxi. Secondly, the vertical load spectrum is compiled by high frequency (HF) load spectrum being superposed on low frequency (LF) load spectrum. The half-power bandwidth method is employed to determine the frequency of the LF load spectrum. And the frequency of the HF load spectrum is obtained based on maximum line velocity principle. Then the loading cycles and amplitudes of the LF load spectrum and the HF load spectrum are determined by using the rain-flow counting method. Thirdly, lateral force is determined and the equivalent relationship of compiled load spectrum and road load spectrum is calculated according to the pseudo-damage theory. Finally, the durability test is carried out to verify the compilation method of load spectrum.

 
Keywords Cylindrical shock absorber; Compilation of load spectrum; Loading lateral force; Durability test
   
    Article #:  22312
 
Proceedings of the 22nd ISSAT International Conference on Reliability and Quality in Design
August 4-6, 2016 - Los Angeles, California, U.S.A.