Dynamic Reliability Analysis of Drum-Body Horizontal Screw Centrifuge

Abstract

Taking the horizontal screw centrifuge drum as the research object, the structural dynamic reliability model with considering the randomness of time-varying load and structural parameters is established, and the reliability and failure rate of drum body are obtained. Firstly, the analytical dynamic model considering fluid-structure interaction is established by using Lagrange equations; Then, imposed the fluid-structure coupling load in Ansys simulation software, and by using random sampling, we obtain the statistical characteristics of the drum body stress distribution; Finally, the evaluation index of structural dynamic reliability is given by using stochastic process and stress-strength interference theory. The results show that: under normal working conditions, the maximum stress concentration area of the horizontal screw centrifuge drum occurs in the sediment area, and its equivalent force presents a time-varying normal distribution. After continuous working for 2000 hours, the probability of drum strength meeting the requirements is less than 80%, and the service life conforms to the characteristics of early failure in the "bathtub" curve, which lays a foundation for the dynamic optimization design of high-speed horizontal screw centrifuge.