Research on the Reliability Allocation Method for a Production System Based on Availability

Abstract

This paper involves a production system, which is composed of units (workstations) and buffers. The buffer is used to store semifinished and finished products in the production process, to reduce the impacts of bad equipment in the production system on the entire system performance. Considering the characteristics of the large number of components and the state of the buffers in the production system, this paper considers the influences of buffer states on upstream and downstream units. When using the availability as the allocation index and combining it with Markov theory, the production unit (workstation) and upstream and downstream buffers are regarded as an equivalent unit (workstation) with multiple output states. We establish the relationship between the availability of each equivalent unit (workstation) and the production system availability and determine a scaling factor for the availability of the equivalent unit to account for the system availability. The expected availability goal of the production system is allocated to each equivalent unit (workstation) by the scaling factor; then, the availability of each equivalent unit (workstation) is assigned to each unit. Finally, the Plant Simulation software is used to simulate and analyze the production system to verify the correctness of the allocation method and realize the reliability allocation from a complex production system to a unit.

Reliability Allocation Considering Risk Indicators and Their Uncertainties Through Probabilistic Composition of Preferences

“…Saadi et al (2019) put forward an extension of the threedimensional method proposed by Yadav (2007) and Yadav et al (2006) to contemplate systems with multiple phases, to include the dependencies between the operational phases with impact on the reliability of the components. Wang et al (2020) presented an approach to reliability allocation that considers the availability of production systems. The authors urged the consideration of buffers (inventories of finished and semi-finished products) for the analysis of productive processes.…”