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Study of operation reliability based on diagnosis information for mechanical equipment
He Zhengjia,Cai Gaigai,Shen Zhongjie,Cao Hongrui,Li Bing
Strategic Study of CAE 2013, Volume 15, Issue 1, Pages 9-14
The traditional reliability analysis has such shortcomings that it relies on probability statistics with the large sample statistical data. This study proposes two operation reliability assessment methods which use running condition monitoring information to realize the reliability evaluation under small sample. They are the reliability evaluation methods based on the normalized wavelet information entropy and the damage quantitative identification respectively. Vibration signals of mechanical equipment are decomposed and reconstructed by means of second generation wavelet package to acquire decomposed signals in sub-frequency bands, so that full condition information of running equipment can be adequately used. We take relative energy in each sub-frequency band to calculate normalized information entropy. The reliability degree, an important reliability index, is transformed by using the normalized wavelet information entropy to assess operation reliability for running equipment. A new operation reliability assessment index called membership reliability degree is defined and an operation reliability assessment model is built based on quantitative damage diagnosis. Successful applications have been achieved to assess operation reliability of an oxy-generator compressor and the wheel bearings in electric locomotives, which demonstrated that the proposed approaches are reasonable and effective. The paper provides new approaches without large sample size, which are independent of probability to operation reliability assessment for large machinery.
Keywords： mechanical equipment operation reliability normalized information entropy membership reliability degree
The Operator Reliability Experiment at Qinshan Nuclear Power Plant by the Simulator
Zhang Li,Huang Xiangrui,Zhao Bingquan,Wang Yao
Strategic Study of CAE 2005, Volume 7, Issue 2, Pages 41-46
The lack of data and availability is a major problem that embarrasses human reliability analysis (HRA) for a long time. In the course of Qinshan HRA, a full-size simulator was used to conduct an experiment on the operator’s reliability. It involves 3 cognition patterns including those of the skill-based, rule-based and knowledge-based and 23 abnormal events (55 His) which affect greatly the safety of power plant. The response time and conditions of 38 operators were recorded and kinescoped. 764 data points were resulted. All the data were analyzed and processed to develope HRA/HCR basic model parameter which matches with the features of Qinshan Nuclear Power Plant system and personnels. This paper introduces the background , theory, method, course, conclusion and their comparison with data obtained abroad.
Keywords： human reliability analysis (HRA) simulator experiment human cognition reliability (HCR)
Lu J ianguo
Strategic Study of CAE 2005, Volume 7, Issue 6, Pages 36-40
This paper expounded the importance of reliability study on low-voltage circuit-breakers and residual current operated circuit-breakers, introduced the general situation of their reliability study carried out by the international authoritative academic academy IEEE and pointed out the difficulty and significance of the research work on these aspects. Then this paper discussed the failure modes of low-voltage circuit-breakers and residual current operated circuit-breakers, and provided their reliability indexes and reliability compliance test plans at the first time, which provided a kind of theory and method for the reliability research work of low-voltage protective electrical apparatus carried through in Chinese electrical apparatus industry.
Keywords： failure modes reliability indexes reliability compliance test plan
A mechanical reliability study of 3-dB waveguide hybrid couplers in submillimeter and terahertz bands Research Articles
Zhongqian Niu, Bo Zhang, Daotong Li, Dongfeng Ji, Yang Liu, Yinian Feng, Tianchi Zhou, Yaohui Zhang, Yong Fan,zhangbouestc@yeah.net
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 8, Pages 1104-1113 doi: 10.1631/FITEE.2000229
Keywords： 定向耦合器；3-dB分支波导定向耦合器；亚毫米波器件；太赫兹电路；机械可靠性
Reliability analysis of corroded oil and gas pipeline
Xu Wei,Liu Mao
Strategic Study of CAE 2010, Volume 12, Issue 9, Pages 69-72
ASME B31G is the international criteria to assess the failure stress of corroded pipeline, taking into account its conservatism, this paper studies the failure stress of corroded pipeline based on the modified B31G, and considers some random variables that contains pipeline wall thickness, corrosion rate, operating pressure, defect depth and so on, so a limit state function of corroded carrying Oil/Gas is established. Afterwards, the first order and second moment method is employed for research on the reliability of corroded pipeline, and calculation on reliability index, failure probability and remaining life. In addition, to further standardize the management of corrosion of pipelines, taking into account the relevant provisions of American Petroleum Institute, different failure probability of pipeline were graded. In the final, a sensitivity analysis was carried out on random variables involved in the problem. The results of sensitivity analysis indicate that the failure probability is the most sensitive to the coefficient of variation of wall thickness.
Keywords： corroded pipeline reliability analysis FORM failure probability
An Estimate Method of Parametric in Reliability Engineering
Han Ming
Strategic Study of CAE 2003, Volume 5, Issue 3, Pages 51-56
In this paper, the Bayesian method, an estimate method for parameter in reliability engineering is put forward. The author gives definition of the new Bayesian estimate for failure probability and failure rate, and shows the estimate of the failure probability and the failure rate by new Bayesian method. Finally, calculations are performed regarding to practical problems, which show that the new Bayesian method is feasible, easy to operate, and convenient to use for engineers and technicians in fieldwork.
Keywords： reliability engineering parameter estimate new Bayesian estimate failure probability
Quantitative methods for warship equipment reliability，maintainability and supportability
Huang Jiadian,Li Yanqiang and Dong Li
Strategic Study of CAE 2015, Volume 17, Issue 5, Pages 14-19
Four methods of benchmarking analysis，Delphi method with similar products，analog estimation method and statistical inference methods were applied to analyze and confirm the adaptability of the quantitative indicators for warship equipment reliability，maintainability and supportability. The principles for constructing the top-level parameter index and the “three of quality” quantitative indicators for warship equipment were proposed.
Keywords： reliability；maintainability；supportability；quantitative indicators
Reliability and Life Management on Aeroengine Used in Army
Xu Kejun,Jiang Longping
Strategic Study of CAE 2003, Volume 5, Issue 1, Pages 82-88
Based on the reliability and life management on aeroengines used in army in western countries, the basic elements of aeroengine reliability and life management are expatiated, and the differences and errors about reliability in China are discussed. The reason that the reliability and life management lag behind is pointed out, for example, outmoded management concept, inadequate management system, weak groundwoork, imperfect standard Finally, the paper points out the proper way to construct and improve the reliability and life managtment in China.
Keywords： aeroengine reliability life management
Reliability Design and Analysis of Spacecraft Thermal Cont rol/Thermal Management System
Li Yunze ,Ning Xianwen ,Wang Xiaoming ,Shi Xiaobo
Strategic Study of CAE 2007, Volume 9, Issue 7, Pages 53-56
Based on the developing demand of spacecraft thermal control and thermal management, basic design schemes and analysis models for maintaining thermal control/thermal management system's reliability are developed through classifying and reviewing of common spacecraft thermal systems and devices. Examples are given to show the application patterns and methods of the reliability design schemes and analysis models, which provide a fundamental tool for advanced design and analysis for the reliability of spacecraft thermal control and thermal management system.
Keywords： spacecraft thermal control thermal management reliability
Stiction and Friction in Micro Electro Mechanical Systems
Wang Weiyuan
Strategic Study of CAE 2000, Volume 2, Issue 3, Pages 36-41
The stiction and friction influencing the yield and reliability of MEMS are reviewed in this paper.The stiction, called release-related stiction, can occur within micron gaps of Si microstuctures during the etching of sacrifacial layer by HF and drying. It can also occur after packaging of the device due to over range of input signals and is called in-use stiction. It is concluded that the capillary force of water between two Si hydrophilic surfaces at separation gap of micron is the major contributor to the release-related stiction. The origin of in-use adhesion is from the chemical state of Si surface. Coating of anti-stiction films on the surface of Si microstructures and packaging of devices under dry atmosphere or vacuum are the most important methods to prevent the in MEMS devices from stiction. The preparation technology of anti-stiction films and its problems are described. Comparing with stiction, the friction is more complex. The commercially produced accelerometers and digital mirror devices are the devices with no direct contact friction. After using anti-stiction films, the stiction is fully prevented, and even the friction is apparently decreased. However, friction still exists in MEMS of direct contact moving parts. The wear resoluted from friction will decrease the reliability and lifetime of the devices. To fabricate the films with anti-stiction and wear-resitsting ability are the key research projects in high speed moving MEMS devices.
Keywords： micro electro mechanical systems stiction friction anti-stiction films wear-resisting films
Research on initiation network reliability of viaduct demolition blasting
Wu Xinxia,Zhao Gen,Xie Xianqi
Strategic Study of CAE 2014, Volume 16, Issue 11, Pages 72-77
Non-electric initiation system was the only initiation system for viaduct blasting demolition. Aimed at the application actuality, the relay point characteristicof multiple parallel detonator initiation system was studied in the paper, and the simple formula for mean value of the relay point initiation time was put forward. Reliability standard for non-electric initiationsystem of different scale was established. Duplex-cross non-electric initiation systemwas invented, which not only can avoid side roll in the viaduct collapse process, but also can elevate the reliability of the relay point. Research achievements can provide theoretical basis for viaduct blasting demolition initiation system design.
Keywords： viaduct demolition blasting initiation system reliability
Stable Reliability—Based Optimization Designof Compressive Bar
He Xiangdong,Zhang Yimin,Xue Yuchun,Wen Bangchun
Strategic Study of CAE 2007, Volume 9, Issue 5, Pages 33-35
Based on the stable reliability design theory and the optimization design method, the stable reliability-based optimization of compressive bar is extensively discussed and a numerical method for stable reliability-based optimization is proposed. On the condition of known first two moments of basic random variables, the respective program can be used to obtain the stable reliability-based optimization information of compressive bar accurately and quickly.
Keywords： compressive bar probabilistic perturbation method stable reliability optimization design
Zero-failure accelerated reliability demonstration test method based on degradation model
Zhang Huirui
Strategic Study of CAE 2015, Volume 17, Issue 5, Pages 31-37
Traditional life demonstration test is conducted under normal conditions and fails to use degradation observations，thus requires large amount of time and money. We can employ degradation data to predict whether a unit will pass the test by the end of test，and the test can be terminated early when this prediction does not cost unacceptable risk. Also higher stress can accelerate the degradation of the unit to cut down the test time. Thus it is necessary to propose a method that take advantage of both degradation data and accelerated test to reduce the test time and cost，which is done by this article. In particular，the article propose an approach to analyses and calculate the additional risks caused by early termination of the test and applying higher stress based on degradation model，then the minimum sample size of different test time can be picked. The article also use optimal plan to give expected test time and give deciding rules of terminating the test for each unit. At last，the method is illustrated by an example， showing that the method is efficient in reducing test time.
Keywords： degradation model；accelerated testing；life demonstration；risk analysis；optimum plan
Reliability Optimization Design for Coil Tube-spring
Zhang Yimin,He Xiangdong,Wen Bangchun
Strategic Study of CAE 2002, Volume 4, Issue 5, Pages 71-74
Techniques from the second moment method and reliability optimization design method are employed to present the practical and effective method for the reliability optimization design for coil tube-spring on the condition of known probabilistic characteristics of basic random variables. The respective program can be used to obtain the reliability optimization design information of coil tube-spring accurately and quickly.
Keywords： coil tube-spring reliability optimization design second moment method
Reliability-centered Maintenance Method and Its Application in a Tunnel
Wang Jingchun,Fang Sisi,Li Xiaomeng and Zhang Wei
Strategic Study of CAE 2017, Volume 19, Issue 6, Pages 61-65 doi: 10.15302/J-SSCAE-2017.06.009
This study is presented in view of the current tunnel monitoring maintenance status and existing problems, and proposes reliability-centered maintenance (RCM) as a maintenance concept. RCM can be introduced into tunnel management. Accordingly, a preliminary study on the application of the RCM method in tunnel monitoring maintenance is performed through the tunnel equipment failure mode and a reliability analysis. Finally, by adopting a case, this study shows that a tunnel using the RCM analysis method can effectively reduce the maintenance cost, and has certain economic and social benefits.
Keywords： tunnel reliability maintenance monitoring failure analysis
Title Author Date Type Operation
Study of operation reliability based on diagnosis information for mechanical equipment
He Zhengjia,Cai Gaigai,Shen Zhongjie,Cao Hongrui,Li Bing
Journal Article
The Operator Reliability Experiment at Qinshan Nuclear Power Plant by the Simulator
Zhang Li,Huang Xiangrui,Zhao Bingquan,Wang Yao
Journal Article
Study on Reliability of Low-voltage Circuit Breakers and Residual Current Protective Electrical Apparatus
Lu J ianguo
Journal Article
A mechanical reliability study of 3-dB waveguide hybrid couplers in submillimeter and terahertz bands
Zhongqian Niu, Bo Zhang, Daotong Li, Dongfeng Ji, Yang Liu, Yinian Feng, Tianchi Zhou, Yaohui Zhang, Yong Fan,zhangbouestc@yeah.net
Journal Article
Quantitative methods for warship equipment reliability，maintainability and supportability
Huang Jiadian,Li Yanqiang and Dong Li
Journal Article
Reliability Design and Analysis of Spacecraft Thermal Cont rol/Thermal Management System
Li Yunze ,Ning Xianwen ,Wang Xiaoming ,Shi Xiaobo
Journal Article
Research on initiation network reliability of viaduct demolition blasting
Wu Xinxia,Zhao Gen,Xie Xianqi
Journal Article
Stable Reliability—Based Optimization Designof Compressive Bar
He Xiangdong,Zhang Yimin,Xue Yuchun,Wen Bangchun
Journal Article
Zero-failure accelerated reliability demonstration test method based on degradation model
Zhang Huirui
Journal Article
Reliability Optimization Design for Coil Tube-spring
Zhang Yimin,He Xiangdong,Wen Bangchun
Journal Article
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