On robot reliability and safety - bibliography

This paper presents several aspects of robot reliability and safety. An extensive list of selective references is presented.     

On Bayesian estimation of system reliability

For a system with n s-independent components, the uncertainty regarding the reliability of components for a fixed point of time is expressed by a Bayesian probability distribution. Using the moments of these distributions, the exact moments of the system reliability distribution are derived, from which a discrete probability density function is obtained on the basis of the principle of maximum entropy. Taking this distribution as a prior distribution for system reliability, a posterior density function for the system reliability is constructed either using the data obtained from life tests conducted at a system level or from field data. For tracking the evolution of the reliability distribution over time, a modified Kalman filter technique, along with use of a Bayesian procedure, is proposed. This method is simple, elegant and easy to compute.     

On the reliability of a cold standby system attended by a single repairman

We present a reliability analysis of a multiple cold standby system satisfying the usual conditions (i.i.d. random variables, single repair facility, perfect repair, queueing). Each unit has a constant failure rate but an arbitrary repair time distribution. We introduce a basic set of measures related to a stochastic process defined on some filtered probability space. The set of measures constitutes a system of renewal integral equations. The solution is constructed by means of a Cauchy integral. A particular case (deterministic repair) provides some explicit results illustrated by a computer-plotted graph.     

On the increase of system reliability by parallel redundancy

Adding parallel redundancy to different components generally yields different system reliability improvements. The effect of such parallel redundancy upon system reliability when applied at various places and in various systems is investigated. The problem of how to choose components for parallel redundancy is studied, and some results are given. Some examples are presented to illustrate the approach     

Bayesian reliability analysis of a series system

Bayesian analysis combines subjective judgement with experimental data. Using failure information in accumulated time, the present paper deals with the posterior analysis of a series system in respect of its reliability characteristics.     

A certain model of reliability diagnostic of renewal objects

In the paper the model of reliability diagnostic of renewal objects which exploitation process can be described as the interrupting renewal process with the finite time of repair is discussed. The essential relationships between reliability of object and diagnostic parameters are presented.     

软件可靠性与安全性研究

文章通过对软件可靠性与安全性基本概念的探讨与澄清,提出了当前对软件可靠性进行定性评价是十分必要并且切实可行的判断,并希望为今后的研究找到一条切实可行的技术路线。     

Interval reliability of a two-unit stand-by redundant system

This brief note obtains expressions for Interval Reliability of a 2-unit stand-by repairable system by using the regenerative point technique of the Markov Renewal Process.     

Estimation of system reliability for uncooled optical transmittersusing system reliability function

This paper investigates the system reliability for 155 Mb/s optical transmitters by deriving a system reliability function from reliability data of each component for transmitters, laser diode, photodiode, optical assembly, and driver IC. The reliability data for each component reliability function have been obtained from accelerated aging test. The reliability parameters such as failure rate, mean time-to-failure (MTTF), standard deviation are obtained from a probability plotting method. From the system reliability function, the MTTF of the optical transmitter at 65°C was estimated to be 47000 h with 95% confidence. In this estimation, we introduced modified lifetime of laser diodes and reliability function of optical assembly     

Software reliability how it affects system reliability

This paper suggests that there is an additional measurable attribute, system “structuredness” which contributes to system reliability. It examines the effect of the structure of software on the integrity of a system. It shows how intuition fails us, when we accept a less hierarchally structured system and expect it to behave as reliably. “Structuredness”, can be used together with the system availability figure to provide a realistic measure of system integrity. The results of implementing structured programming techniques to increase software reliability are briefly discussed.     

某军用三坐标激光非接触测量系统的安全性及精度控制方法研究

安全性和精度控制是三坐标激光非接触测量技术在武器系统测量领域中应用所必须解决的问题。本文在简要介绍某军用三坐标激光非接触测量系统的基础上,详细介绍了该系统在安全性和精度控制方面所采取的措施,并对系统误差和异常数据处理方法进行了讨论。最后,通过测量应用实例对上述理论分析进行验证,结果显示,该系统单点测量精度优于7μm．球面度测量精度优于22μm,测量系统的安全性和精度符合该武器系统使用要求。     

Quantifying uncertainty in reliability and safety studies

The paper discusses the extent to which the quantification of reliability and safety of engineering systems can be considered to be credible and useful, and the reasons why the standard methods normally used can be misleading. The problem is discussed in relation to prediction and to measurement, for hardware, software and human aspects of engineering systems. Suggestions are made for improving the credibility and value of reliability and safety predictions and measurements.     

Robot safety and reliability: A review

This article reviews selective literature on Robot Safety and Reliability. The litterature is obtained mainly from journals and conference proceedings of the leading world robotic associations and has been classified into three broad categories: Robot Reliability; Robot Safety and Maintenance; and General. The General category includes articles that touched on elements of both Robot Reliability and Robot Safety and Maintenance. Tables are developed in conjunction with this review and a comprehensive list of references is provided.     

On the design of a reliability circuit simulator

This paper describes the outcome of a study into the feasibility of a reliability circuit simulator for ICs in general and the critical parameters involved in particular. The necessary conditions are formulated that have to be fulfilled before any construction of the reliability simulator is meaningful or can be done at all. It has been found that failure mechanisms in the wear-out regime meet these conditions. Next, a general approach is given to make a simulator. This approach is actually derived from circuit simulator activities on hot carrier degradation and electromigration, respectively. Finally, the different groups of parameters are defined.     

A note on solving a system reliability problem

This paper is concerned with solving a constrained system reliability problem from the literature, which is to maximize a nonlinear reliability function subject to two linear constraints. The variables are positive integers, representing the allocations of the stages. By running on an ordinary personal computer the computer program listed in this paper, the best known solution for a widely-known 15-stage example from the literature was obtained thirteen times among the first eighty candidate solutions of one computer run. The computational results presented in this paper suggest that the computer program listed here can be useful as a model for solving the constrained system reliability problem.     

A reliability model of a system with dependent components

A model of a multi-component system with dependent components in the time stationary case is presented. A procedure fits the parameters of the model with respect to given data such as the correlation coefficients. The system reliability of the fitted model is evaluated     

Function process and reliability analysis of a two-dependent-unit system

In this paper, a two-dependent-unit system is discussed. We assume that the life distribution of the two units is a two-dimensional exponential distribution, and the repair distributions are general distributions, respectively, and the failure unit cannot be repaired “as good as new”. By using a function process, some reliability indices are derived.