A dynamic time-varying reliability model for linear guides considering wear degradation

This paper devotes to providing a dynamic reliability model for linear guideways for the whole life. Since a linear guide is always worn, the wear degradation of the linear guide is established. Moreover, the profile error of rail is considered. To get the dynamic behavior of linear guides precisely, we developed a dynamic stiffness model of the system in terms of different load conditions and operation time. The reliability model with variant stochastic parameters is proposed according to the contact characteristics of linear guides. The Monte Carlo method is adopted to solve the reliability of linear guides. The simulation results show the reliability curve agrees with the experimental results, as well as the engineering experience in practice. The proposed model can be well applied to the reliability prediction for linear guideways.