Used item replacement policy

Abstract

The block replacement policy, wherein items are replaced at regular intervals of time and on failure, is rather wasteful because sometimes almost new items are also removed. As an alternative a policy of replacement by new items at regular intervals of time and by used items on failure, is suggested. The consequences of this policy, called used item replacement policy, are studied for Erlangian and sub-exponential life-time distributions. The latter distribution which is the difference of two negative exponential distributions, does not seem to have received much attention in the literature so far.

Review of Long-Term Warranty Policies

“…However, reconditioning/overhaul is worthwhile if the expected saving in the warranty servicing cost or the increased profit due to increased sale price exceeds the costs associated with the improvement. Bhat (1969) introduced the application of useditem in rectification. Nakagawa (1979) developed optimum replacement policies for used units.…”

Long Term Warranty and After Sales Service

“…Reliability improvement through overhaul and upgrades has received some attention in the reliability literature. Bhat (1969) introduced used item replacement policy. Nakagawa (1979) developed optimum replacement policies for used units.…”

A modified block replacement policy with two variables and general random minimal repair cost

“…Barlow and Hunter [4] assumed that the repair cost is constant. Cox [17], Crookes [18], Blanning [11] and Nakagawa [21,22] suggested allowing the system to remain inactive if a failure occurs in [(k -1)T + To, kT) for any k and for some To, and Bhat [10], Tango [29,30], and Ait Kadi et ale [2] proposed replacing a failed system by a used one. Nakagawa [20] introduced replacement by used systems or minimal repair depending on the interval in which the failure occurred.…”