RELIABILITY REDUNDANCY DESIGN-USING SIMULATION

摘要

Reliability is one of the main parameters of the products considered to be important to survive in the competitive market. Reliability in its simple form means the probability that a failure may not occur in a given period of time i.e., the component performs adequately without failure. The subsystems or components in a system are arranged in series or parallel depending on the space constraint. However, the reliability of the system with components arranged in parallel is more than that system for which the components are arranged in series. Redundancy is providing the components in a subsystem in parallel such that if one component fails then the other component automatically comes into operation. Through redundancy any desired level of reliability can be obtained. But in doing so, we have to invest money or other material resources to achieve the desired reliability. But a designer has to consider the economic views of the organization in designing a system with high reliability. Therefore, it is necessary to optimize the number of redundant components in the system by trade off between system reliability and the cost of resources. Component reliability is a random variable in practical situation. Stochastic reliability problem is modeled and simulation technique is employed to arrive at the solution. Reliabilities of the components are assumed to be of stochastic nature as the circuit constants change due to active redundancy and components follow stochastic distributions. A package in 'C + +' language for 'reliability redundancy design using simulation' is developed.