Reliability analysis and failure rate evaluation for critical subsystems of the dragline

Based on failure analysis of CNC lathe capstan turret and building failure tree, according to the fuzzy information provided by the users, engineers and technician, the failure rate is defined as a set of trapezoidal fuzzy number. By means of fuzzy operation, the paper determines the failure fuzzy probability of the capstan turret. By analyzing the calculation results, It proves that this method can be applied to the reliability analysis of CNC lathe capstan turret subsystem, provide a reference for modification design of the capstan turret subsystem.

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Failure rate evaluation with influencing factors

Journal of Loss Prevention in the Process Industries ◽

10.1016/j.jlp.2009.07.013 ◽

2010 ◽

Vol 23 (2) ◽

pp. 187-193 ◽

Cited By ~ 15

Author(s):

Florent Brissaud ◽

Dominique Charpentier ◽

Mitra Fouladirad ◽

Anne Barros ◽

Christophe Bérenguer

Keyword(s):

Influencing Factors ◽

Failure Rate ◽

Rate Evaluation

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Fatigue Lifetime Design of Pantograph V500 Based on Reliability

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.135-136.540 ◽

2011 ◽

Vol 135-136 ◽

pp. 540-546

Author(s):

Dong Li Song ◽

Wei Hua Zhang ◽

Ping He

Keyword(s):

Reliability Analysis ◽

Failure Rate ◽

Fatigue Lifetime ◽

General Management ◽

Reliability Level ◽

Service Conditions ◽

Mean Time

Reliability analysis of structure fatigue has two assignments: a. To forecast lifetime of the structure on given reliability level, b. To evaluate reliability level of the structure on given service conditions, material features and designing dimensions. It aims at evaluating the structure’s designing quality and providing a basis for designing improvement or manufacturing. At mean time, it provides instruction to updating management by parameter of failure rate under given fatigue lifetime.Lastly, in form of tables, this paper presents the predicting results of fatigue lifetime of pantograph V500 based on different reliability levels at 500km/h and the predicting results of reliability level of Pantograph V500 under lifetime of 1,200,000km which provide direction of design, manufacturing and general management for Pantograph V500.

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Reliability Analysis of Load-SharingK-out-of-NSystem Considering Component Degradation

Mathematical Problems in Engineering ◽

10.1155/2015/726853 ◽

2015 ◽

Vol 2015 ◽

pp. 1-10 ◽

Cited By ~ 1

Author(s):

Chunbo Yang ◽

Shengkui Zeng ◽

Jianbin Guo

Keyword(s):

Reliability Analysis ◽

Failure Rate ◽

Load Sharing ◽

Performance Degradation ◽

Random Component ◽

Rate Model ◽

Successful Operation ◽

Degradation Model ◽

System Requirement ◽

Degradation Effect

TheK-out-of-Nconfiguration is a typical form of redundancy techniques to improve system reliability, where at leastK-out-of-Ncomponents must work for successful operation of system. When the components are degraded, more components are needed to meet the system requirement, which means that the value ofKhas to increase. The current reliability analysis methods overestimate the reliability, because using constantKignores the degradation effect. In a load-sharing system with degrading components, the workload shared on each surviving component will increase after a random component failure, resulting in higher failure rate and increased performance degradation rate. This paper proposes a method combining a tampered failure rate model with a performance degradation model to analyze the reliability of load-sharingK-out-of-Nsystem with degrading components. The proposed method considers the value ofKas a variable which is derived by the performance degradation model. Also, the load-sharing effect is evaluated by the tampered failure rate model. Monte-Carlo simulation procedure is used to estimate the discrete probability distribution ofK. The case of a solar panel is studied in this paper, and the result shows that the reliability considering component degradation is less than that ignoring component degradation.

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