Abstract
Effective maintenance is crucial for equipment performance in industry. Imperfect maintenance conform to actual failure process. Taking the dynamic preventive maintenance cost into account, the preventive maintenance model was constructed by using age reduction factor. The model regards the minimization of repair cost rate as final target. It use allowed smallest reliability as the replacement condition. Equipment life was assumed to follow two parameters Weibull distribution since it was one of the most commonly adopted distributions to fit cumulative failure problems. Eventually the example verifies the rationality and benefits of the model.
Highlights
Equipment is the major asset of the modern enterprise
The proper adjustment of the engine is imperfect maintenance, because the engine will not return to a new state but a state improved a lot after the adjustment
Age reduction factor is influenced by equipment age and preventive maintenance cost rate
Summary
Equipment is the major asset of the modern enterprise. Preventive maintenance is an ideal repair method in eliminating fault. Malik proposed the concept of improvement factor[3] It can measure age improvement degree and failure rate after repair. The traditional preventive maintenance method calculates the maintenance cycle according to the average life, reliability or single repair cost. Age reduction factor is influenced by equipment age and preventive maintenance cost rate. (4) Single preventive maintenance cost shows a linear relationship with repair numbers. It is expressed as cpmi c f icv .Equipment is worn with increase of device age, each maintenance time becomes longer, which is tpmi 1/ k i h , 1/ k is time adjustment parameter. Figure. is the periodic imperfect preventive maintenance strategy model diagram
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