MAINTENANCE POLICY FOR DUMPTRUCK CONSIDERING USAGE RATE AND OPPORTUNITY OF MAINTENANCE

• Main Author: ALFI (NIM : 23410069), RIZKI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/24062
• Institution: Institut Teknologi Bandung

The maintenance policy studied is a hybrid maintenance policy, ie replace the item if it failure in (T, S] and other failures are repaired with minimal repair. The policy is extended with the involvement of opportunity factor in the interval (T, S], which means that if there is failure in (T,S] with probability p (0 <p<1) it is replaced, and 1 - p is not replaced. Failure modelling uses the AFT (Accelerated Failure Time) model that allows to incorporate usage and operating condition in the failure rate function h(t). The decision variables of the model are T and S. T* and S* optimal are <br /> <br /> <br /> obtained by minimizing the expected total maintenance cost per unit time, J(T,S). Sensitivity analysis was done to see the behaviour of the solution with respect to the change of parameter values. The results show that the greater of y and &#947; values, the wider the interval <br /> <br /> <br /> (T,S] and the lower expectations total cost per unit time (T,S], and the greater the p value, the greater the J(T,S). Comparison of the model results indicate that the EHOP (External Hybrid Opportunitas) model yield better solutions than the EHD (External Hybrid Dasar) model.