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failure rate,return-to-sports and magnetic resonance imaging after meniscal repair:119 patients with 7 years mean follow up

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World Journal of Orthopedics 2023年第8期14卷 612-620页

作者： Juan Pablo Zicaro Nicolas Garrido Ignacio Garcia-Mansilla Carlos Yacuzzi Matias Costa-Paz Department of Knee Hospital Italiano de Buenos AiresBuenos Aires 1109Argentina

BACKGROUND One of the most important factors to consider in relation to meniscal repair is the high failure rate reported in the existing *** To evaluate failure rates,return to sports(RTS)rate,clinical outcomes and magnetic resonance image(MRI)evaluation after meniscus suture repair for longitudinal tears at a minimum *** We conducted a retrospective review of meniscal repairs between January 2004 and December *** patients treated for longitudinal tears associated or not with an anterior cruciate ligament reconstruction(ACL-R)were *** ramp lesions,radial and root tears,associated with multiligament injuries,tibial fracture and meniscal allograft transplants were *** details and failure rate,defined as symptomatic patients who underwent a revision surgery,were *** isolated bucket handle tears(BHTs)were usually associated with higher failure rates,we compared BHTs and not BHTs associated or not with an *** 2014,the inside-out technique using cannulas and suture needles with 2-0 Tycron began to *** addition,the number of stitches per repair was *** view of differences in surgical technique,we compared two different cohorts:before and after *** recorded the RTS according to the level achieved and the time to *** and IKDC scores were *** were studied with x-rays and MRI as standard postoperative *** One hundred and nineteen patients were included with a mean follow up of 7 years(SD:4.08).Overall failure rate was 20.3%at a mean 20.1 *** statistically significant differences were found when comparing failure for medial and lateral meniscal repair(22.7%and 15.3%,P=0.36),BHTs and not BHTs(26%and 17.6%,P=0.27),isolated or associated with an ACL-R(22.9%and 18%,P=0.47),or when comparing only BHTs associated with an ACL-R(23%and 27.7%,P=0.9)or *** comparing cohorts before and after 2014,we found a significant decrease in the overall f

关键词： Meniscus repair Bucket handle tears Meniscal suture failure rate Longitudinal meniscus tears

Modeling the failure rate of a Standby Multi-Component System and Improving Reliability

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Modern Mechanical Engineering 2023年第1期13卷 21-33页

作者： Aslain Brisco Ngnassi Djami Wolfgang Nzié Serge Doka Yamigno Department of Fundamental Sciences and Techniques of Engineer Chemical Engineering and Mineral Industries School University of Ngaoundere Ngaoundere Cameroon Department of Physics Faculty of Science University of Ngaoundere Ngaoundere Cameroon

Evaluating the reliability of a system requires knowledge of the failure modes to which it is subjected. Complex topology systems generally require a high level of availability, which is a function of the arrangement of elements (components) in the system. To avoid serious failures for such complex systems, recourse can be had to the redundancy techniques available in the literature. These techniques help to improve system reliability, without affecting the reliability of system components. This paper is interested in the proposal of a model for evaluating the failure rate of a standby multi-components system and in improving the reliability of mechanical systems, arranged in a topology (series, parallel, or mixed).

关键词： Reliability Modeling Topology Redundancy Availability failure rate

Coordinating an Extended Warranty Supply Chain under Increasing,Constant and Decreasing Product failure rates

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Journal of Systems Science and Systems Engineering 2020年第5期29卷 609-628页

作者： Yuwen Chen Jin Qin Tongdan Jin Yating Chen School of Management University of Science and Technology of ChinaHefei 230026China Department of Information Systems City University of Hong KongKowloon 999077Hong KongChina Ingram School of Engineering Texas State UniversitySan Marcos TX78666USA

A product typically exhibits three different failure rates across its lifetime:increasing,decreasing,or *** paper studies how the characteristics of failure rate impact the supply chain coordination for an extended warranty program involving a manufacturer and a retailer.A two-stage Stackelberg game is utilized to model the interaction between these two *** extended warranty channel structures are compared depending on whether the manufacturer or the retailer offers the warranty *** analysis shows that the failure rate trend during the warranty period has different effects on the coordination of the service supply *** a product has an increasing or constant failure rate,the optimal length of extended warranty offered by the retailer is longer than that of the manufacturer,while the optimal length is shorter for a product with a decreasing failure *** a product during the warranty coverage has an increasing or constant failure rate,a longer extended warranty period will motivate customers to buy the product without the warranty,whereas more customers will buy both the product and the warranty if the product experiences a decreasing failure *** is concluded that,if the manufacturer and the retailer incur the same warranty service cost,the total profit in the supply chain is higher when the manufacturer offers the extended *** the game participants'perspective,the one which sells the extended warranty will obtain more profit.

关键词： Supply chain coordination extended warranty failure rate warranty policy game theory

AGING PROPERTIES OF THE LIFETIME IN SIMPLE ADDITIVE DEGRADATION MODELS

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Journal of Systems Science & Complexity 2011年第4期24卷 753-760页

作者： Xiaohu LI Rongfang YAN Yiqiang ZHAO School of Mathematical Science Xiamen University Xiamen 361005 China. College of Mathematics and Information Beienee Northwest Normal University Lanzhou 730050 China. Schoolof Mathematics and Statistics Carleton University Ottawa Ontario KIS 5B6 Canada.

This paper deals with the simple additive degradation models with single random effect. The authors further study the link between the aging property of the implied lifetime and that of the random variation. It is found that both the aging property of the random variation and the analytical behavior of the mean degradation path influence the aging behavior of the implied lifetime.

关键词： decreasing reversed hazard rate (DRHR) failure rate increasing failure rate (IFR) increasing failure rate in average (IFRA) new better than used (NBU) star-shaped super-additivity.

Time-dependent Vibration Frequency Reliability Analysis of Blade Vibration of Compressor Wheel of Turbocharger for Vehicle Application

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Chinese Journal of Mechanical Engineering 2014年第1期27卷 205-210页

作者： WANG Zheng WANG Zengquan ZHUANG Li WANG A-na Science and Technology on Diesel Engine Turbocharging Laboratory China North Engine Research Institute Center of Engine Test and Measurement China North Engine Research Institute

Blade vibration failure is one of the main failure modes of compressor wheel of turbocharger for vehicle application. The existing models for evaluating the reliability of blade vibration of compressor wheel are static, and can not reflect the relationship between the reliability of compressor wheel with blade vibration failure mode and the life parameter. For the blade vibration failure mode of compressor wheel of turbocharger, the reliability evaluation method is studied. Taking a compressor wheel of turbocharger for vehicle application as an example, the blade vibration characteristics and how they change with the operating parameters of turbocharger are analyzed. The failure criterion for blade vibration mode of compressor wheel is built with the Campbell diagram, and taking the effect of the dispersity of blade natural vibration frequency and randomness of turbocharger operating speed into account, time-dependent reliability models of compressor wheel with blade vibration failure mode are derived, which embody the parameters of blade natural vibration frequency, turbocharger operating speed, the blade number of compressor wheel, life index and minimum number of resonance, etc. Finally, the rule governing the reliability and failure rate of compressor wheel and the method for determining the reliable life of compressor with blade vibration is presented. A method is proposed to evaluate the reliability of compressor wheel with blade vibration failure mode time-dependently.

关键词： turbocharger compressor wheel blade vibration reliability failure rate reliable life

Risk Analysis and Assessment of Overtopping Concerning Sea Dikes in the Case of Storm Surge

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China Ocean Engineering 2014年第4期28卷 479-487页

作者：王莉萍黄桂玲陈正寿梁丙臣刘桂林 College of Mathematical Science Ocean University of China School of Naval Architecture and Marine Engineering Zhejiang Ocean University College of Engineering Ocean University of China

Risk analysis and assessment relating coastal structures has been one of the hot topics in the area of coastal protection recently. In this paper, from three aspects of joint return period of multiple loads, dike failure rate and dike continuous risk prevention respectively, three new risk analysis methods concerning overtopping of sea dikes are developed. It is worth noting that the factors of storm surge which leads to overtopping are also considered in the three methods. In order to verify and estimate the effectiveness and reliability of the newly developed methods, quantified mutual information is adopted. By means of case testing, it can be found that different prior variables might be selected dividedly, according to the requirement of special engineering application or the dominance of loads. Based on the selection of prior variables, the correlating risk analysis method can be successfully applied to practical engineering.

关键词： sea dikes risk analysis failure rate mutual information

Mathematical Modeling and Evaluation of Reliability Parameters Based on Survival Possibilities under Uncertain Environment

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Computer Modeling in Engineering & Sciences 2023年第3期134卷 1943-1956页

作者： Alhanouf Alburaikan Hamiden Abd El-Wahed Khalifa Pavan Kumar SeyedaliMirjalili Ibrahim Mekawy Department of Mathematics College of Science and ArtsQassim UniversityAl-Badaya51951Saudi Arabia Department of Operations Research Faculty of Graduate Studies for Statistical ResearchCairo UniversityGiza12613Egypt Division of Mathematics School of Advanced Science and LanguagesVIT Bhopal UniversitySehore466114India Centre for Artificial Intelligence Research and Optimization Torrens University AustraliaBrisbane4006Australia Department of Mathematics College of Science and ArtsQassim UniversityAr Rass6688Saudi Arabia YFL(Yonsei Frontier Lab) Yonsei UniversitySeoul03722Korea

In this article,mathematical modeling for the evaluation of reliability is studied using two *** of the methods,is developed based on possibility *** performance of the reliability of the system is of prime *** view of this,the outcomes for the failure are required to evaluate with utmost *** possibility theory,the reliability information data determined from decision-making experts are *** samemethod is also related to the survival possibilities as against the survival *** other method is the one that is developed using the concept of approximation of closed interval including the piecewise quadratic fuzzy *** this method,a decision-making expert is not sure of his/her estimates of the reliability *** experiments are performed to illustrate the efficiency of the suggested methods in this *** the end,the paper is concluded with some future research directions to be explored for the proposed approach.

关键词： Reliability function probabilistic function piecewise quadratic fuzzy numbers survival possibility failure rate possibility distribution state function closed interval approximation

Modeling,Simulation,and Risk Analysis of Battery Energy Storage Systems in New Energy Grid Integration Scenarios

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Energy Engineering 2024年第12期121卷 3689-3710页

作者： Xiaohui Ye Fucheng Tan Xinli Song Hanyang Dai Xia Li Shixia Mu Shaohang Hao School of Electrical Engineering Yanshan UniversityQinhuangdao066004China Power System Department Electric Power Research InstituteBeijing100192China

Energy storage batteries can smooth the volatility of renewable energy *** operating conditions during power grid integration of renewable energy can affect the performance and failure risk of battery energy storage system(BESS).However,the current modeling of grid-connected BESS is overly simplistic,typically only considering state of charge(SOC)and power *** lithium(Li)-ion battery cell models are computationally intensive and impractical for real-time applications and may not be suitable for power grid operating ***,there is a lack of real-time batteries risk assessment *** address these issues,in this study,we establish a thermal-electric-performance(TEP)coupling model based on a multitime scale BESS model,incorporating the electrical and thermal characteristics of Li-ion batteries along with their performance degradation to achieve detailed simulation of grid-connected ***,considering the operating characteristics of energy storage batteries and electrical and thermal abuse factors,we developed a battery pack operational riskmodel,which takes into account SOCand charge-discharge rate(Cr),using amodified failure rate to represent the BESS *** integrating detailed simulation of energy storage with predictive failure risk analysis,we obtained a detailed model for BESS risk *** model offers a multi-time scale integrated simulation that spans month-level energy storage simulation times,day-level performance degradation,minutescale failure rate,and second-level BESS *** offers a critical tool for the study of ***,the performance and risk of energy storage batteries under three scenarios—microgrid energy storage,wind power smoothing,and power grid failure response—are simulated,achieving a real-time state-dependent operational risk analysis of the BESS.

关键词： Grid-connected battery energy storage system thermal-electric-performance coupling model operational risk model failure rate risk analysis

Reliability Growth Test Planning and Verification of Commercial Vehicles

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Automotive Innovation 2019年第4期2卷 328-337页

作者： Liu Jicheng Huang Liyan Zhou Renmin Markus Volmer Beiqi Foton Motor Co. Ltd.Beijing 102206China

Reliability and durability are two important technical indicators in automobile research and development.A research-and-design and testing organization can increase inherent quality attributes by adopting a systematic approach based on statistical tools and clearly defined *** process affects the design phase,validation through testing,and quality assurance in *** the basis of reliability growth theory and the Duane model,this study established an estimation method for the definition of the target mileage and specific test cycles in reliability growth testing.A construction method for defin-ing test conditions was proposed that adopts the theory of the design of *** simulation was conducted under a variety of typical test conditions including differing operation times,loads,and logistics modes to predict customer use and detect *** cases were then analyzed in *** the same time,a reliability growth prediction model was established on the basis of the initial test data and used for test process tracking and risk control.

关键词： Reliability Duane model Reliability growth prediction model failure rate