Reliability modeling-based tolerance design and process parameter analysis considering performance degradation

In this paper, creep at room temperature is studied using a mechanical double−spring steering−gear load table, and the results are used to determine the accuracy of theoretical and simulated data. A creep equation at room temperature, based on the parameters obtained by a new macroscopic tensile experiment method, is used to analyze the creep strain and creep angle of a spring under force. The correctness of the theoretical analysis is verified by a finite−element method. Finally, a creep strain experiment of a torsion spring is carried out. The experimental results are 4.3% lower than the theoretical calculation results, which demonstrates the accuracy of the measurement, with an error of <5% achieved. The results shows that the equation used for the theoretical calculation is highly accurate and can meet the requirements of engineering measurement.

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Research on the Spring Creep Based on the Load Simulator of the Double Torsion Spring Steering Gear

As basic components, springs are widely used in aerospace, mechanical and electrical fields. Due to their various functions such as buffer, energy storage and polarization, springs are playing an increasingly important role in various fields. In the long-term storage process, due to environmental factors such as temperature, the spring will be degraded, manifested as the stress relaxation phenomenon, and the process is that as the storage time increases, the elasticity of the spring slowly declines, and the load capacity slowly decreases, the torque changes while the spring is released. In this paper, the variation of spring torque under different stress is taken as the degradation of the spring, and the reliability analysis of the springs' experimental data based on the degradation distribution is analyzed by using the stochastic process degradation modeling method and the generalized degenerate modeling method respectively. The advantages and disadvantages of different methods will be given, it provides a reliable and effective way to analyze the degradation process of springs.

Ming Yuan

Papers

Reliability Assessment of Spring Based on Two Degradation Modeling Methods