|M.Sc Student||Lavi Yifat|
|Subject||A Reliability Approach to Spare Parts Supply|
|Department||Department of Quality Assurance and Reliability||Supervisor||Professor Dov Ingman|
Companies who wish to support their product in the course of its use by the customer, operate a support system, such as a supply chain.
The total time it takes supply a spare part mostly serves as indicator of the process efficacy. Current approach, assumes this time to be uniformly distributed, and measures it only.
We present a new method for measuring the spare parts supply time, based on a Reliability-oriented approach, introducing a reliability model, using a set of existing reliability tools. With the supply process considered as a series-parallel system, it will be possible to identify its “failures” and “successes”, and evaluate the supply system reliability.
The paper comprises a characterization study of all sub-processes within the supply process, a development of an algorithm for determining the distribution of each sub-process population and development of criteria for it.
The conclusions of this study are on two main levels:
of the reliability approach
1) The total supply time is not distributed uniformly and contains sub-processes with dissimilar populations.
2) Different distributions (mostly new and unfamiliar distributions) were found for the different sub-processes within the supply process.
3) The Spare Parts supply process is independent of the system type.
Effect of sub-process timing on the total supply time
Each sub-process has certain limitations in terms of its timing. With the supply process traversed backwards, criteria were developed for each sub-process, within the framework of the overall time criterion prescribed by the company.