Preventive replacement is applied to improve the device availability or increase the profit per unit time of the maintenance system.
In this paper, we study age-replacement model of technical object for n-state system model. The criteria function applied in this
paper describe profit per unit time or coefficient of availability. The probability distribution of a unit‘s failure time is assumed to be
known, and preventive replacement strategy will be used over very long period of time. We investigate the problem of maximization
of profit per unit time and coefficient availability for increasing the failure rate function of the lifetime and for a wider class of lifetime. The purpose of this paper is to obtain conditions under which the profit per unit time approaches a maximum. In this paper
we shows that the criteria function (profit per unit time or coefficient availability) can be expressed using the matrix calculation
method. Finally, a numerical example to evaluate an optimal replacement age is presented.
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