Accession Number : ADA308824

Title :   Component Availability for An Age Replacement Preventive Maintenance Policy.

Descriptive Note : Doctoral thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Murdock, William P.

PDF Url : ADA308824

Report Date : DEC 1995

Pagination or Media Count : 161

Abstract : This research develops the availability function for a continuously demanded component which is maintained by an age replacement preventive maintenance policy. The availability function, A(t), is a function of time and is defined as the probability that the component functions at time t. The component is considered to have two states: operating and failed. In this policy, the component is repaired or replaced at time of failure. Otherwise, if the component survives T time units, a preventive maintenance service is performed. T is known as the age replacement period or preventive maintenance policy. The component is considered to be as good as new after either service action is completed. A renewal theory approach is used to develop A(t). Past research has concerned infinite time horizons letting analysis proceed with limiting values. This research considers component economic life that is finite. The lifetime, failure service time and preventive maintenance service time probability distributions are unique and independent. Laplace transforms are used to simplify model development. The age replacement period, T, is treated as a parameter during model development. The partial Laplace transform is developed to deal with truncated random time periods. A general model is developed in which the resulting availability function is dependent on both continuous time and T. An exact expression for the Laplace transform of A(t, T) is developed.

Descriptors :   *AGING(MATERIALS), *PREVENTIVE MAINTENANCE, FUNCTIONS, TIME INTERVALS, POLICIES, THEORY, AVAILABILITY, LIMITATIONS, LIFE CYCLES, FAILURE(MECHANICS), TRUNCATION, LAPLACE TRANSFORMATION.

Subject Categories : Administration and Management
      Logistics, Military Facilities and Supplies

Distribution Statement : APPROVED FOR PUBLIC RELEASE