A Reliability Model of Micro-Engines Subject to Natural Degradation and Dependent Zoned Shocks

Che, Haiyang; Zeng, Shengkui; Guo, Jianbin

doi:10.1109/access.2019.2957305

Cited by 10 publications

(8 citation statements)

References 38 publications

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“…In practice, soft failure and hard failure are DCFP due to the effect of the same shock load. More and more researchers [13][14][15][16][17][18][19][20][21][22] acknowledged that random shock has an essential effect on degeneration failure and sudden failure. Lin 13 studied the general dependences between the degradation and two types of random shocks (extreme shocks and cumulative shocks).…”

Section: Introductionmentioning

confidence: 99%

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Reliability modeling for planetary gear transmission system considering dependent failure processes

Lyu

Wang

et al. 2021

Quality & Reliability Eng

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Many mechanical systems are subject to degradation and random shock processes, which are dependent and competing. The two processes are soft failure process and hard failure process, either of which occurs will cause the system to fail. In this paper, a hard failure model of the gear system is established based on the Stress-Strength Interference model, and a soft failure model of the system is also proposed. To consider the dependence between the two failure processes, the copula function is adopted. Then, the reliability model of the system subject to degradation and shocks is developed, and an expression of the system reliability is derived. Finally, a planetary gear transmission system is taken as a numerical example to demonstrate the effectiveness of the proposed model, which is considered a k-out-of-n system experiencing the processes of degradation and random shocks. Moreover, the effect of model parameters on reliability is evaluated through sensitivity analysis.

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Section: Introductionmentioning

confidence: 99%

“…However, a system with high reliability and long life can resist small shock loads due to material strength. Thus, random shocks are generally divided into fatal shock loads and nonfatal shock loads, [19][20] respectively, causing the hard failure of systems and additional sudden increases in the degradation level.…”

Section: Introductionmentioning

confidence: 99%

Reliability modeling for planetary gear transmission system considering dependent failure processes

Lyu

Wang

et al. 2021

Quality & Reliability Eng

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“…Soft failure often occurs by a continuous smooth degradation process, when the cumulative damage is larger than a predetermined threshold. 16,17 Traditionally, external shock models are divided into many classes according to the system failure mechanism, and four principal kinds of shock models are widely used, which are called extreme shock mode, cumulative shock model, run shock model, and δ-shock model. 18−20 The system fails when the magnitude of a shock is larger than a crucial level in an extreme model, or the cumulative damage exceeds the predetermined value in the cumulative model.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the system breaks down when the magnitude of stress is larger than strength. Soft failure often occurs by a continuous smooth degradation process, when the cumulative damage is larger than a predetermined threshold 16,17 . Traditionally, external shock models are divided into many classes according to the system failure mechanism, and four principal kinds of shock models are widely used, which are called extreme shock mode, cumulative shock model, run shock model, and δ‐shock model 18 .…”

Section: Introductionmentioning

confidence: 99%

Reliability modeling for multistage systems subject to competing failure processes

Lyu

Yang

Wang

et al. 2021

Quality & Reliability Eng

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In this paper, a novel multistage reliability model is provided as systems are often divided into many stages according to system degradation characteristics. Multistage hard failure (caused by random shock) process (MHFP) and multistage soft failure (caused by random shock and continuous degradation) process (MSFP) are introduced to describe the competing failure processes, where either the MSFP or MHFP would break down the system. The shock processes impact the system in three ways: (1) fatal load shocks cause hard failure immediately in the hard failure process; (2) time shocks cause a hard failure threshold changing;(3) damage load shocks cause degradation level increasing in the soft failure process. In this paper, a density function dispersion method is carried out to address the multistage reliability model, and the effectiveness of the proposed models is demonstrated by reliability analysis with the one-stage model. Finally, the multistage model is applied to a case study, the degradation process is divided into three stages, and the hard failure threshold can be transmitted twice. The proposed model can be applied in other multistage situations, and the calculation method can satisfy the accuracy requirements.

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“…Jiang et al [26] studied the two dependencies of the shock process and the hard failure threshold level. In the linear degradation and shock competition failure model of the micro engine established in [27], shocks can be categorized into three shock zones according to their magnitudes: safety zone, damage zone, and fatal zone. Lehmann [28] considered that failure is a competitive model of degradation and trauma and established a degradation-threshold-shock model (DTS model).…”

Section: Introductionmentioning

confidence: 99%

Reliability Analysis for the Dependent Competing Failure With Wear Model and its Application to the Turbine and Worm System

et al. 2021

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Many systems are usually subjected to the combined effects of degradation and random shocks at the same time. Their failures are the competitive result of soft failure caused by degradation and hard failure caused by shocks. For operating machinery, wear failure is the main failure mechanism, and the machine is also subject to shock during the wear process. This paper proposes a new generalized surface wear model in combination with dependent competing failure processes; this proposed model is different from the other wear model with independent wear increments. As a typical mechanical structure, worm gears and worms are subjected to the combined effect of two failure mechanisms: soft failure caused by performance degradation, and hard failure caused by shocks. Meanwhile, it is necessary to consider the competitiveness and correlation of these two failure mechanisms. The interdependent competitive failure model is used to describe the failure of operating machinery. In this study, the extended Archard model is used to calculate the wear depth of the tooth surface, and the wear model is established through the wear threshold. The relationship between tooth surface wear depth and duty cycle, sliding speed, and contact stress is analyzed. An iterative algorithm is used to derive a nonlinear time-varying wear degradation model considering contact stress and sliding velocity. Comparing the calculation results with the Monte Carlo simulation method, the model has high accuracy and describes the mechanism of soft and hard failures, and the mutual dependence of the two failure mechanisms has an important effect on reliability. Numerical examples are presented to illustrate the developed reliability models, along with sensitivity analysis.INDEX TERMS Archard model, dependent competing failure, hard failure threshold, system reliability, wear degradation.

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A Reliability Model of Micro-Engines Subject to Natural Degradation and Dependent Zoned Shocks

Cited by 10 publications

References 38 publications

Reliability modeling for planetary gear transmission system considering dependent failure processes

Reliability modeling for planetary gear transmission system considering dependent failure processes

Reliability modeling for multistage systems subject to competing failure processes

Reliability Analysis for the Dependent Competing Failure With Wear Model and its Application to the Turbine and Worm System

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