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Time-dependent reliability and optimal design of scraper chains based on fretting wear process

Shuai Li (School of Mechatronic Engineering, Jiangsu Key Laboratory of Mine Mechanical and Electrical Equipment, China University of Mining and Technology, Xuzhou, China and Jiangsu Collaborative Innovation Center of Intelligent Mining Equipment, Xuzhou, China)
Zhencai Zhu (School of Mechatronic Engineering, Jiangsu Key Laboratory of Mine Mechanical and Electrical Equipment, China University of Mining and Technology, Xuzhou, China and Jiangsu Collaborative Innovation Center of Intelligent Mining Equipment, Xuzhou, China)
Hao Lu (School of Mechatronic Engineering, Jiangsu Key Laboratory of Mine Mechanical and Electrical Equipment, China University of Mining and Technology, Xuzhou, China and Jiangsu Collaborative Innovation Center of Intelligent Mining Equipment, Xuzhou, China)
Gang Shen (School of Mechatronic Engineering, Jiangsu Key Laboratory of Mine Mechanical and Electrical Equipment, China University of Mining and Technology, Xuzhou, China and Jiangsu Collaborative Innovation Center of Intelligent Mining Equipment, Xuzhou, China)

Engineering Computations

ISSN: 0264-4401

Article publication date: 3 June 2021

Issue publication date: 7 December 2021

312

Abstract

Purpose

This paper aims to present a dynamic reliability model of scraper chains based on the fretting wear process and propose a reasonable structural optimization method.

Design/methodology/approach

First, the dynamic tension of the scraper chain is modeled by considering the polygon effect of the scraper conveyor. Then, the numerical wear model of the scraper chain is established based on the tangential and radial fretting wear modes. The scraper chain wear process is introduced based on the diameter wear rate. Furthermore, the time-dependent reliability of scraper chains based on the fretting wear process is addressed by the third-moment saddlepoint approximation (TMSA) method. Finally, the scraper chain is optimized based on the reliability optimization design theory.

Findings

There is a correlation between the wear and the dynamic tension of the scraper conveyor. The unit sliding distance of fretting wear is affected by the dynamic tension of the scraper conveyor. The reliability estimation of the scraper chain with incomplete probability information is achieved by using the TMSA for the method needs only the first three statistical moments of the state variable. From the perspective of the chain drive system, the reliability-based optimal design of the scraper chain can effectively extend its service life and reduce its linear density.

Originality/value

The innovation of the work is that the physical model of the scraper chain wear is established based on the dynamic analysis of the scraper conveyor. And based on the physical model of wear, the time-dependent reliability and optimal design of scraper chains are carried out.

Keywords

Acknowledgements

This work was supported by the Key Project of National Natural Science Foundation of China (Grant No. U1510205), Program for Changjiang Scholars and Innovative Research Team in University (Grant No. IRT_16R68), a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

Citation

Li, S., Zhu, Z., Lu, H. and Shen, G. (2021), "Time-dependent reliability and optimal design of scraper chains based on fretting wear process", Engineering Computations, Vol. 38 No. 10, pp. 3673-3693. https://doi.org/10.1108/EC-09-2020-0548

Publisher

:

Emerald Publishing Limited

Copyright © 2021, Emerald Publishing Limited

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