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Received: 2018-10-14

Revision Accepted: 2019-03-14

Crosschecked: 2019-03-17

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Xiao-sheng Zhang


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Journal of Zhejiang University SCIENCE A 2019 Vol.20 No.4 P.272-289


Condition-based scheduled maintenance optimization of structures based on reliability requirements under continuous degradation and random shocks

Author(s):  Xiao-sheng Zhang, Jian-qiao Chen, Jun-hong Wei

Affiliation(s):  Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment, Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China

Corresponding email(s):   jqchen@mail.hust.edu.cn

Key Words:  Soft failure, Hard failure, Remaining useful lifetime (RUL), Reliability, Maintenance, Cost rate, Finite horizon

Xiao-sheng Zhang, Jian-qiao Chen, Jun-hong Wei. Condition-based scheduled maintenance optimization of structures based on reliability requirements under continuous degradation and random shocks[J]. Journal of Zhejiang University Science A, 2019, 20(4): 272-289.

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%T Condition-based scheduled maintenance optimization of structures based on reliability requirements under continuous degradation and random shocks
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%A Jian-qiao Chen
%A Jun-hong Wei
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%DOI 10.1631/jzus.A1800578

T1 - Condition-based scheduled maintenance optimization of structures based on reliability requirements under continuous degradation and random shocks
A1 - Xiao-sheng Zhang
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A1 - Jun-hong Wei
J0 - Journal of Zhejiang University Science A
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1800578

In this paper, a condition-based scheduled maintenance model with aperiodic inspections of structures is developed. The structures are experiencing both a gradual degradation process and a random shock process. The former is characterized by a stationary gamma process (SGP), and the latter is assumed to be a homogeneous Poisson process (HPP). Two typical common failure modes are considered in the reliability and the condition-based maintenance model, namely: (1) soft failures caused by the continuous degradation process, together with sudden damage increments due to shocks with moderate impacts, and (2) hard failures caused by the same shock process when a severe shock occurs. A remaining useful lifetime-based (RUL-based) inspection policy is utilized to determine the inspection schedule. Thereafter, at each inspection point, different maintenance actions are to be determined to minimize the average cost rate for either an infinite or a finite time span. The developed models are demonstrated by a numerical example. Sensitivity analyses of the optimal solution with various model parameters are also performed. It is illustrated that, as compared with the pure continuous degradation process, the additional shock loads exert notable impacts on the optimal maintenance strategies.

This paper combines a reliability model and a condition-based maintenance model considering both the degradation process and the shock effect to optimize the maintenance cost. Remaining useful lifetime is implemented to determine the inspection time and the optimization process is carried out for a system over an infinite and finite time span. This paper shows a good quality.


目的:结构在使用过程中,其性能往往发生劣化而导致其安全性能(可靠度)不断降低. 本文旨在探讨结构在连续退化和冲击荷载共同作用下,其可靠度随时间的变化情况. 此外,研究结构的最佳维修策略,使其在满足可靠度约束条件的同时,将平均费用降到最低.
创新点:1. 在连续退化和冲击荷载的共同影响下,建立结构时变可靠度计算模型. 2. 在前述可靠度分析的基础上,建立基于状态维修的非周期检测模型; 基于剩余使用寿命检测策略,确定检测时间,并确定系统的最优维护策略,旨在将平均维护成本率降至最低. 3. 针对无限时间域和有限时间域,分别确定对应的最佳维修策略.
方法:1. 通过理论推导,构建结构时变可靠度计算公式(公式(13)),分析各参数与可靠度之间的变化关系(图4). 2. 通过仿真模拟,运用蒙特卡洛法确定结构在使用过程中的最佳维修策略(图5和6).
结论:1. 与仅考虑连续退化的情况相比,随机冲击荷载的存在,使得系统的可靠度降低,更容易发生失效. 2. 冲击载荷的存在,对最佳维修策略具有显著影响. 3. 有限时间域的最优解与无限时间域的最优解之间存在很大的不同,因此,有必要对这两种情况分别进行研究.

关键词:软失效; 硬失效; 剩余寿命; 可靠度; 维修; 成本率; 有限时域

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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