Prediction of remaining useful life (RUL) of Komatsu excavator under reliability analysis in the Weibull-frailty model.

Dejan Dragan,Awat Ghomghaleh,Reza Khaloukakaie,Ali Nouri Qarahasanlou,Mohammad Ataei,Omeid Rahmani,Abbas Barabadi,Amin Beiranvand Pour

doi:10.1371/journal.pone.0236128

Abstract

It is an essential task to estimate the remaining useful life (RUL) of machinery in the mining sector aimed at ensuring the production and the customer’s satisfaction. In this study, a conceptual framework was used to determine the RUL under the reliability analysis in a frailty model. The proposed framework was implemented on a Komatsu PC-1250 excavator from the Sungun copper mine. Also, the Weibull-frailty model was selected to describe the failure behavior and compare it with the classical-exponential model. The frailty model was also used to evaluate the impact of unobserved environmental conditions on the RUL values. Both applied models were fitted to the obtained data from 80 operational hours of the Komatsu PC-1250 excavator. Plotting the results from the reliability analysis of two models demonstrated that the mine system with the frailty model performs better than the classical model before reaching the reliability of 80%. Besides, the frailty model shows a coherent with the operational time of the excavator, while the classical model demonstrates a sinusoid variation. The obtained results may be used for the development of maintenance, preventive repairs planning, and the spare parts replacement intervals.

Highlights

The mining machinery sector of Iran has been faced with numerous difficulties in terms of the production capacity and cost to compete in global markets
The conceptual framework relied on the reliability analysis in two classical and frailty models
The frailty model was used to evaluate the impact of unobserved environmental conditions on the remaining useful life (RUL) values

Summary

Introduction

The mining machinery sector of Iran has been faced with numerous difficulties in terms of the production capacity and cost to compete in global markets. Problems arise when the opportunities are foreclosed in Iran as a worldwide attempt to implement the sanction policy [1]. The existing accounts fail to resolve these difficulties, and a focus on new indicators and approaches needs to be associated with higher efficiency in the mining machinery sector of Iran. Indicators such as reliability, availability, and security are recognized as significant factors to determine the efficacy of the mining system.

Methods

Results

Conclusion