系统冗余优化设计的启发式算法

可靠性设计是系统设计的重要环节,系统冗余设计是可靠性设计的重要方法,也是提高系统可靠性的有效手段。在Sharma算法思路的基础上,考虑了新的试探方式,试图给“最有可靠度效益的级”增加冗余,并采用级替换因子判断给系统中的哪一级增加冗余对系统最有效益。在替换因子的考虑上,提出两种算法,并举例说明算法如何在部件可靠度确定的情况下,考虑系统设计代价(费用,重量,体积等),优化配置部件的冗余数。     

Residual Strength Study for Damaged Hull and Risk Analysis and Formal Safety Assessment

Residual strength assessment and prediction has been introduced in the project studies, including the determination of risk failure scenario, the change law of structural capacity and load effects in the damage of ship structure, the models for structural response and ultimate strength analysis, and dynamical model of reliability assessment. In addition, the project has improved the calculation method of ship ultimate load -bearing capacity, and studied the change law, assessment criteria of residual strength, and the method of predicting lifetime for aging ships. The valuable conclusions have been obtained by a large number of engineering calculations. The project and its extended results can provide theoretical foundation and background condition to make risk rule and modem design system, and can implement risk analysis and formal safety assessment for the marine world. The results will improve design quality and shipping safety of ship and offshore and enhanced their society and economic benefits.     

Poisson过程的可靠性增长模型(Ⅲ)——评定与预测

本文提出了两个新模型。基于定数和定时截尾试验数据,用最小二乘方法和极大似然方法,研究了在第i阶段失效时间遵从强度(或均值率)为λ_i的Poisson过程的可修系统的可靠性评定与预测问题。这些结果能用于单参数指数分布的无替换(或有替换)定数(或定时)截尾试验的情况。     

A GMRP Approach for Reliability Analysis of Repairable Systems

We propose here a mathematical approach for the study of repairable systems with arbitrary distributions. The idea is to define a new type of stochastic process, called a generalized Markov renewal process (GMRP). which may describe the transition behavior of the stochastic process at non-regenerative points. In the paper an analytical method for the GMRP is put forward and the formulas are then presented for reliability analysis of repairable systems which can be described by a GMRP with finite states. A signal flow graph technique for system modeling is also summarized here. Finally- an analytical model to evaluate the reliability of a m-out-of- n.G system with general repair-time distribution is developed by means of the GMRP approach.     

复杂电子设备研制阶段数据的可靠性综合评估

利用复杂电子设备研制阶段故障数据 ,综合评估其可靠性水平 ,可以为复杂电子设备的定型及可靠性鉴定提供依据。为了对复杂电子设备研制阶段各试验数据进行可靠性综合评估 ,在可靠性增长的杜安模型基础上 ,引入不同试验条件下的环境折合系数 ,建立了复杂电子设备的可靠性综合评估模型 ,并提出了相应的综合评估方法 ,最后给出了所述方法与模型的一个工程应用实例。     

水泥混凝土路面结构设计方法的可靠性验证

依据广泛的路况调查资料，对水泥混凝土路面结构设计方法的可靠性进行了验证，建立了设计方法的理论分析结果同实际使用情况不相符的偏差修正方程。     

任务成功概率模型的正确表述

本文导出允许在不超过τ时间内修复故障的系统任务可靠度模型,以及一组相应的设计公式,给装备的可靠性与维修性指标的正确确定奠定了理论基础;指出了美国MIL—HDBK—338、美国海军维修性设计规范等军用手册中给出的相应公式有误。     

跳频接收与提高漏泄通信可靠性

工业漏泄通信系统中工作频率发生漂移时 ,会导致信号无法正常接收而出现失控 ,利用跳频电路可以提高通信系统可靠性 ,防止通信过程中的信号丢失故障     

基于参数Bootstrap方法的双参数指数分布可靠寿命的置信下限

针对双参数指数分布的截尾数据,利用一种新的参数Bootstrap方法,构建了可靠寿命的置信下限,并从理论上证明了给出的置信下限是精确的.在小样本情形下,通过比较新的参数Bootstrap方法取得的置信下限与Engelhardt-Bain方法取得的近似置信下限的覆盖率,发现参数Bootstrap置信下限更令人满意.     

城市给水管网可靠性分析方法

在分析管段组件可靠度的基础上,得出节点可靠度,进而由权重因子法计算得到将城市给水管网发生机械故障与水力条件变化相结合时的管网可靠度模型,通过该模型的建立总结出给水管网可靠性评估方法,最后就模型分析给出结论及建议。