Due to the clerances, real products often exhibit nonlinear behavior. The purpose of this study is to investigate how contact nonlinearity affects the rate of damage accumulation when exciting the product with a random signal.
An overview of solving linear and nonlinear systems was conducted, where the harmonic balancing method was examined. The focus is then on a nonlinear system with two degrees of freedom and contact nonlinearity, comparing three different contacts (rubber, plastic, metal). The results of numerical calculations are compared with experimental results, demonstrating a satisfactory ability to predict the system's response. Based on the experimental results, an analysis of the impact of nonlinearity and statistical estimators on the rate of damage accumulation is performed. This is determined using the rainflow method, which serves as a reference for verifying spectral counting methods.
Measurement results show that contact nonlinearity can have a negative impact on the lifespan of one part of the system and a positive impact on another part of the system.
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