可靠性分析技术

针对目前多数国内机床制造企业可靠性意识差或想做可靠性分析却苦于理论和实践知识缺乏的状况,系统介绍了故障模式、影响及危害性分析、故障树分析、热分析、应力均衡分析、匹配性分析等5种常用可靠性分析技术。介绍了5种可靠性分析技术的分析流程、实施要点、分析原则等。这些可靠性分析技术已成功应用于机床、汽车、航空航天等多个行业,事实证明,通过可靠性分析可以有效提高产品可靠性。

基于故障传递模型的装备可靠性自动分析技术

针对电子装备FMECA和FTA过程中缺乏故障数据的问题,研究了基于故障传递模型自动开展FMECA、 FTA等可靠性分析工作的过程。故障传递模型融合了装备结构、功能、故障影响关系和故障传递关系,可为可靠性分析提供基础数据。首先,给出了建立装备故障传递模型的方法及流程;然后,在此基础上,研究了如何利用已建立的故障传递模型来自动生成装备的FMECA和FTA,从而实现可靠性自动分析的方法;最后,以某短波端机为对象,进行了案例研究,验证了该方法的有效性。

关于电子元器件质量和可靠性技术分析

伴随信息化时代的深入发展,各类电子产品逐渐渗透到我们的日常生活之中,并成为大多数人生活中不可或缺的重要组成部分。电子产品性能的完善与电子元器件质量的提升是密不可分的,尽管现阶段各种电子元器件的质量与可靠性都取得了一定程度的提升,但同时也存在一些问题,需要进一步加强管理。本文笔者就针对电子元器件质量和可靠性管理进行了分析和研究。

结构系统广义可靠性及其数值仿真

建立了结构系统广义可靠性分析模型。根据随机变量可能同时具有随机性和模糊性的特点 ,分别提出了模糊强度—随机应力、随机强度—模糊应力和模糊强度—模糊应力情况下的模糊可靠性分析方法。同时 ,建立了结构系统为独立单元部件串联或并联组成的模糊可靠性分析模型。考虑到不同模糊随机变量组合下的可靠性积分一般不存在解析解的情况 ,提出了用仿真法计算可靠度数值解 。

基于IDAC-STPA模型的战机飞行安全性分析与评价

针对战机飞行安全性分析不全面且缺少定量评价的问题,提出了一种新的飞行安全性分析和评价方法。首先,危险分析技术(system theoretic process analysis,STPA)可以从系统的角度分析影响战机飞行安全的风险源,基于人为可靠性动态分析(information,decision and action in crew,IDAC)模型是目前最全面的人为可靠性分析模型,结合两者的优势提出了IDAC-STPA分析方法。然后,利用该方法分析战机飞行风险源,并在此基础上建立了飞行员操纵-战机机体模型,叠加不同飞行条件下飞行参量的风险度可以得到相应机动动作的安全谱,在此基础上得到该飞行动作的风险度。最后,通过对某型战机眼镜蛇机动的安全性分析,发现该型战机飞行中的不安全控制行为和潜在风险。通过安全谱提供一种直观的分析事故演化的方法,在此基础上计算的风险度提供了一种定量分析事故演化的方法,该方法可以为飞行员的飞行训练提供一定的借鉴。

唐山市再生水利用的经济性分析

再生水利用作为城市第二水源是必然的发展趋势，不仅大大减少水资源的不足，同时减少向河体流域的排污量，同时可带来不断增长的经济效益。

Method of reliability tolerance design based on EDA technology and its application on DC hybrid contactor

Tolerance design, including tolerance analysis and distribution, is an important part of the electronic system’s reli- ability design. The traditional design needs to construct mathematic model of material circuit, which involves large amount of workload and lacks of practicability. This paper discusses the basic theory of electronic system’s reliability tolerance design and presents a new design method based on EDA (Electronic Design Automatic) software. This method has been validated through the application research on reliability tolerance design of the DC hybrid contactor’s control circuit.

Reliability testing and reliability analysis of the over-load protective relay

The over-load protective relay is widely used directly affects the safe running of a motor. The reliability for motor protection. The reliability of the over-load protective relay testing and reliability analysis of the over-load protective relay is an important way to improve the reliability of products. In this paper, the reliability test method of the over-load protective relay is studied, and the reliability tests of the typical products are carried out on a reliability tester developed by authors. In terms of the testing results, the reliability analysis is finished. The failure reasons are found and the measures are put forward to improve the reliability of the products.

多学科设计优化方法在燃气轮机设计中的应用

提出了基于双循环方法的典型燃气轮机部件多学科可靠性优化设计方法,基于近似技术提升了优化效率,缩减了计算规模。以典型燃气轮机涡轮叶片为例实现了燃气轮机部件基于可靠性的多学科优化设计,与确定性优化设计结果比较,本方法可以显著提高燃气轮机部件设计可靠性。

The solution of minimum reliability index for modified weak point of arbitrary curved beam under pure bending

This paper is based on the fundamental loading model of pure bending and the analytical model of a circular beam element with arbitrary initial deflection. The L.W. Guo solution is modified and generalized according to the elastic theory, and the analytical solution for the stress of the beam element with arbitrary initial deflection under pure bending is derived. Using yield theory of edge strength, an expression for the safety margin of one point in the arbitrary curved beam under pure bending （ACPB） is built. This paper modifies the model for weak points of service structures and establishes a foundation for safe design and inspection of imperfect structures. Also, according to the theory of the method of advanced first-order second-moment（AFOSM） , this paper derives an expression for the reliability index of one point in ACPB. Lastly, it modifies the solution for weak points by solving the minimal reliability index.

Combined Implementation of Dependability Analysis Techniques for NPP I＆C Systems Assessment

Dependability analysis of nuclear power plants information and control systems is an important but challenging task. There are several techniques that can be applied for safety and dependability assessments. All of them have limitations and can＇t be easily applied in most cases. Sometimes combined usage of different methods is the most appropriate solution. In this paper we consider techniques of dependability assessment and achievement developed and used by research-and-production corporation ＂Radiy＂. The elements of the assessment methodology are briefly described.

Research and Analysis of the Parallel Computer Network Reliability

With the continuous development of network communication technology and computer technology, parallel computer network applications becoming more widely, its reliability has attracted more attention on researcher. This paper gives a introduction to a simple computer network, given the reliability of the design criteria for computer network analysis, and finally through the examples to illustrate the computer network hardware and software reliability.