Abstract: In order to more accurately reveal the performance degradation of double tube shock absorber during service through the test,based on fully understanding the working state,heat generation and heat transfer of the shock absorber,the damping performance degradation curve of the double tube shock absorber during service is accurately obtained by taking the road load spectrum collected in a test field as the driving signal input,and taking three different working temperatures as variables. The results show that under the condition of specific load spectrum,the damping value of the shock absorber will decrease with the increase of working temperature,and the higher the working temperature during service,the faster the performance degradation of the shock absorber. During the service period,the shock absorber is greatly affected by the operating temperature of the oil. The change of temperature will cause the change of the oil properties,thus affecting the damping characteristics of the shock absorber,and ultimately affecting the degradation rate of the service characteristics of the shock absorber.

Key words: double tube shock absorber, road load spectrum, temperature variable, service characteristics