A Study of Job Scheduling for Automatic Test Systems.
Abstract
This thesis investigated the effects of different scheduling methods on the throughput of Automatic Test Equipment. The types of scheduling considered were first-in-first-out (FIFO), a modified FIFO where all components of the same type were processed in a batch, and a priority scheduling based on determination of the expected time to the next backorder, as predicted by renewal theory, with priority given to the component with the shortest expected time to a backorder. The study was accomplished by constructing a simulation model of the Royal Australian Air Force ATE workshop at 492SQN in South Australia. The repair process was modelled from the time a component became unserviceable to the time it became serviceable again. The arrival process for components was assumed to be Poisson. The ATE testing of components was modelled in detail, but the physical repair and any spares delay were represented by a gamma distribution. The study showed that, for this workshop, the different scheduling methods had little effect because the repair time and spares delay were relatively large, compared to the ATE testing time, and these were the controlling influences in the system. Keywords: Simulation; Automatic test equipment; avionics; maintenance; Job scheduling.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1985
- Accession Number
- ADA161440
Entities
People
- David A. Higgins
Organizations
- Air Force Institute of Technology