Study on the Reliability Test and Degradation Modelling of Double-tube Hydraulic Damping Force

doi:10.3901/JME.2017.24.201

Abstract

Abstract: Aiming at the performance degradation and life evaluation of double-tube hydraulic damper, according to the mechanism of damping force, the changing mechanism of damping force characteristics is analyzed with three typical failure modes which including inside leaking, damping valve binding and performance degradation and the oil viscosity degradation, and based on this, its rebound and compression force model is established. By simulating the indicator diagram and velocity-force diagram are compared to that in different degradation, and the relevant degradation feature is gained. The experiment schedule of damper degradation based on the double-action endurance test rig and performance test rig is presented, and the degradation data of damper quality, rebound force and compression force are obtained by test. Utilizing the linear model and least square method, the estimated parameters of degradation are got, and the damper' pseudo failure life data are determined according to the failure threshold. Combining with the prior information, the minimum sample pseudo failure life data of sample is augmented and corrected by using a virtual augmented samples and the Bootstrap method.

Key words: Bootstrap method, damping force degradation mechanism, extreme small sample, hydraulic damper, reliability test

CLC Number:

U463
TB114

DUAN Fubin, PAN Jun, CHEN Wenhua, XU Hanhui, YANG Likang. Study on the Reliability Test and Degradation Modelling of Double-tube Hydraulic Damping Force[J]. Journal of Mechanical Engineering, 2017, 53(24): 201-210.

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