Research On Fatigue Life And Reliability Of Clamping System Of Dynamic Stabilizer

The dynamic stability car plays an important role in the maintenance of the railway because can effectively improve the lateral resistance of the track and the compactness of the ballast.The power stabilization device is a key operating component of the power stabilization vehicle.Due to its long operating time,the safety of the power stabilization device is particularly important.Therefore,it is of great significance to predict the fatigue life of the structure and analyze the fatigue reliability of the dynamic stabilizer.The dynamic stabilization device is a large-scale nonlinear structural system,which is of great significance for the analysis of its fatigue.This paper is to provide theoretical support for the prediction of the fatigue life of the dynamic stabilizer and the analysis of the fatigue reliability.This paper takes the dynamic stabilizer as the research object based on multi-body dynamics theory,finite element method,and analysis method of fatigue life and fatigue reliability,and it focuses on the study of the fatigue life and fatigue reliability of each part in the clamping system of the dynamic stabilization device and the failure probability of the clamping system in the dynamic stabilizer is analyzed by using the boundary method.The research content and results of this article are as follows:(1)The principle of the dynamic stabilization device is analyzed,and is established a three-dimensional model of the dynamic stabilization device and the multi-body dynamics model of the dynamic stabilization device based on the theory of multi-body dynamics,and analyzed the effective value of the force of the components of the clamping system in the dynamic stabilization device and the force curve of each component of the clamping system in the dynamic stabilization device.(2)The finite element model of the clamp cylinder-piston,transmission arm,clamp connecting rod and clamp arm-clamp wheel are established in the clamping system and are performed an analysis of transient dynamics on it according to the transient dynamics theory and simulation analysis and the stress distribution of each component is obtained.the result of the analysis is: The clamping arm-clamp wheel is the weakest component with the largest stress.Under cyclic load,the stress is large and it is prone to fatigue failure.(3)The stress time history of each component in the clamping system is obtained through transient dynamics simulation.Based on fatigue analysis theory and material SN curve,fatigue life is predicted by fatigue software,and the distribution of fatigue life and Fatigue damage of each component in the clamping system are obtained as well as the minimum number of cycles of each component in the clamping system and the corresponding dangerous parts.(4)Using the probability density function of fatigue life,the fatigue life reliability model of each part in the clamping system is derived,and the reliability and reliability of each part are obtained by calculating the fatigue life reliability model of each part change curve.Combining the theory of stress-strength interference with the theory of structural system failure upper and lower limits,the correlation coefficient between the parts in the clamping system are analyzed and obtained,and the wide limit failure probability and the Ditlevsen limit failure probability of the clamping system of the dynamic stabilization device are also obtained.