Research method for determining preventive maintenance period based on time stress factors

Determining the time interval for preventive maintenance is one of the most important duties in programming maintenance guides. The purpose of planning the time interval is to keep and restore the reliability of equipment, which means selecting the suitable interval to avoid failures before they occur. Existing methods of determining a fixed-time interval always ignore influences such as cumulative failure, overhaul, and repair, which could cause insufficient maintenance or surplus inspection. Therefore, making full use of preventative maintenance is a matter of being able to arrange the time interval introduced by time stress factors that could reflect the effect of cumulative failure, repair, overhaul, etc. By extending or shortening the time interval according to the specific circumstances of equipment, a modified method of time-interval determination is proposed and verified.