Title: Multi-failure mode correlation and dynamic reliability evaluation of helical gears of ring die pellet mill

Authors: Risu Na; Kaifa Jia; Haitang Cen; Weiguo Zhang; Quan Zhang

Addresses: College of Mechanical Engineering, Inner Mongolia University of Technology, Inner Mongolia, Xincheng, Hohhot, China ' College of Mechanical Engineering, Inner Mongolia University of Technology, Inner Mongolia, Xincheng, Hohhot, China ' College of Mechanical Engineering, Inner Mongolia University of Technology, Inner Mongolia, Xincheng, Hohhot, China ' College of Mechanical Engineering, Inner Mongolia University of Technology, Inner Mongolia, Xincheng, Hohhot, China ' College of Mechanical Engineering, Inner Mongolia University of Technology, Inner Mongolia, Xincheng, Hohhot, China

Abstract: Aiming at the low reliability of the gear transmission system of SZLH420 ring die granulator and the unsatisfactory evaluation results at the present stage, the multi-failure mode correlation calculation and dynamic reliability evaluation of helical gear were carried out. Traditional gear reliability evaluation is limited to a single failure mode, but in actual operation, multiple failure modes affect each other, resulting in poor reliability evaluation results. In this paper, the functional functions of each failure mode were constructed based on the stress-strength interference model, then the Monte Carlo method was used to simulate the static reliability of helical gear with multiple failure modes, and the dynamic reliability was calculated based on the Gamma strength degradation theory. Finally, the correlation of multiple failure modes was calculated using the Copula function. Then, the reliability of the most accurate system is obtained. The results show that this method can effectively solve the problem of poor reliability evaluation quality and provide a theoretical basis for the subsequent optimisation of gear.

Keywords: helical gear; reliability; correlation; strength degradation; dynamic evaluation.

DOI: 10.1504/IJRS.2022.131461

International Journal of Reliability and Safety, 2022 Vol.16 No.3/4, pp.169 - 188

Received: 22 Sep 2022
Accepted: 02 Jan 2023
Published online: 13 Jun 2023 *

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