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A simulation model for joint optimization of GM and spare part inventory control under infinite horizon is presented through analyzing the characteristic of spare part demand of a system under group maintenance (GM) policy. In this model, maintenance activities of GM and spare supply are simulated using Monte Carlo method, by which costs of repair, spare inventory, and loss of system downtime induced...
The paper presents a possibility of observation of singular values evolving in time as quantities carrying diagnostic information. To prove the usefulness of singular values for this purpose many numerical simulations have been conducted. It has been proved that when observing changes of singular values obtained from SVD during the lifetime of a machine, the appearance of reversal points must be taken...
Traditional dynamic reliability analyzing methods which are evolved from those methods used in discrete system, are short in dealing with continuous variable and process variable. Using dynamic reliability analyzing methods, this paper proposes a system hybrid dynamic model in which discrete events are included in the continuous system model. Simulation results show that this method can detailed depict...
Reliability and availability have always been important characteristics of systems but become even more critical and complex issues on networks. Due to the high complexity of accurate calculation methods, simulation methods for network reliability and availability evaluation have been a popular area of research, and received significant attention. In this paper the network topology model, the failure...
The paper analyzes the conception and the measuring model of operational availability. For the restrictions of present models' assumptions, an instantaneous operational availability model and an average operational availability model for evaluating material availability together with a simulation method for the two models are put forward. The distinctions between the two models are also given by the...
In this paper, we presented a simulation based model to analysis the reliability of phased-mission system (PMS) with repairable components. Many researches on the repairable PMS supposed that failed components would be repairable only when the system is in a good state. It is different here that failed components can be repaired no matter what state is the system in. The mission successes if and only...
This article elaborates the concept and meaning of virtual reality technology and virtual maintenance, discusses the virtual reality technology application in the process of equipment maintenance, and gives a brief introduction to virtual maintenance system, which use VC and vega software as a platform and set up by Multigen Creator and 3D MAX, quoted an cannon as an example.
Turbo fan engine mathematical model is a highly complex nonlinear system. Solving engine mathematical model with traditional iteration methods turns out to be difficult as these methods are very sensitive to initial values. Therefore particle swarm optimization is used to solve the model. An improved particle swarm optimization algorithm is produced. The mechanism of immune is introduced in the new...
Evaluation is significant tool for contractor equipment maintenance support construction, and also a primary mean to reflect construction effect objectively and accurately. This paper presents basic theory and methods of System Dynamics at first. Then the elements and structure of contractor equipments maintenance support construction system are analyzed, which is help to describe the control relationship...
Breech mechanism is the key and important device to improve reliability and maintenance for large caliber guns. It's major fault mode is grain abrasion caused by dry sliding friction. There are no feasible and practical technologies to simulate and predict the abrasion failure life of key components for breech mechanism. A new simulation and prediction method is firstly put forward in this paper....
Transmission system is the key subsystem of Complicated equipment to realize its maneuverability. Statistic data show that 36 percent of chassis faults is caused by transmission system. To overcome the difficulties of battle decision in confirming appropriate maintenance periods and allocating maintenance resource, a new kind service life and evaluation method based on virtual prototype and Finite...
In this paper, we deal with a preventive maintenance (PM) scheduling and spare parts problems for a rolling stock system. We determine the optimal PM interval and the optimal number of spare parts for components in the rolling stock system to minimize the system life cycle cost during satisfying the system target availability. The system availability and system life cycle cost are estimated by simulation...
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