Some Considerations on the Advanced Total Maintenance Model with Mutual Relief System between Decks' and Engines' Complements due to Digital Simulation

Abstract

This third trial mutual relief maintenance model (MODEL H) is a more advanced one which has three modes of intervals T_p (port one) during home port, T_f (unrelieved one), T_h (relieved one) within a propelling one T_s (=T_f+T_h) and the corresponding three types of manpowers M_p (port relief one), M_f (inherent engines' one; =M_s), M_h (combined one) with a common complement M_c (M_h=M_f+M_c) between decks' and engines' department during T_h than MODEL I (24 hours maintenance model) and MODEL II (8 hours one) of [1] ISSOA-'79 Tokyo and MODEL T (total one with home port relief) of [2] MESJ-'82.
According to some results of GPSS digital simulation [3] with only two input data of occurring rate λ and man-hour per occurrence mh some useful trade-off relationships among many variables of total member M_T (=M_p+M_f+M_c) and an equivalent complement M_E (T_v⋅M_E=T_p⋅M_p+T_f⋅M_f+T_h⋅M_h) from due to a queuing length L and its rate l corresponding to some residual man-hour (ΔMH) are obtained by an important index of utilization η [4] which satisfies two necessary- and sufficientconditions with an allowable inventory L_c for MODEL H.
Considering an overtime H_o the statistical results of simulation agree with the concept of theoretical queuing model for mutual system.