Request PDF on ResearchGate Reliability Block Diagram Modeling - Comparisons. The three software packages that were compared are Reliasoft BlockSim Version. Vendors usually provide free demonstration versions of their software.

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Contents • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Overview Reliability, maintainability, and availability (RAM) are three system attributes that are of great interest to systems engineers, logisticians, and users. Collectively, they affect both the utility and the life-cycle costs of a product or system. The origins of contemporary reliability engineering can be traced to World War II. The discipline’s first concerns were electronic and mechanical components (Ebeling, 2010). However, current trends point to a dramatic rise in the number of industrial, military, and consumer products with integrated computing functions Because of the rapidly increasing integration of computers into products and systems used by consumers, industry, governments, and the military, reliability must consider both hardware, and software. Maintainability models present some interesting challenges. The time to repair an item is the sum of the time required for evacuation, diagnosis, assembly of resources (parts, bays, tool, and mechanics), repair, inspection, and return.

Administrative delay (such as holidays) can also affect repair times. Often these sub-processes have a minimum time to complete that is not zero, resulting in the distribution used to model maintainability having a threshold parameter.

A threshold parameter is defined as the minimum probable time to repair. Garmin mobile xt download. Estimation of maintainability can be further complicated by queuing effects, resulting in times to repair that are not independent. This dependency frequently makes analytical solution of problems involving maintainability intractable and promotes the use of simulation to support analysis. System Description This section sets forth basic definitions, briefly describes probability distributions, and then discusses the role of RAM engineering during system development and operation.

The final subsection lists the more common reliability test methods that span development and operation. Basic Definitions Reliability defined as the probability of a system or system element performing its intended function under stated conditions without failure for a given period of time (ASQ 2011).

A precise definition must include a detailed description of the function, the environment, the time scale, and what constitutes a failure. Each can be surprisingly difficult to define as precisely as one might wish. Maintainability defined as the probability that a system or system element can be repaired in a defined environment within a specified period of time. Increased maintainability implies shorter repair times (ASQ 2011). Availability probability that a repairable system or system element is operational at a given point in time under a given set of environmental conditions.

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