ch17_ism[1] - CHAPTER Maintenance and Reliability 17...

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254 D ISCUSSION Q UESTIONS 1. The objective of maintenance and reliability is to maintain the capability of the system while controlling costs. 2. Candidates for preventive maintenance can be identiFed by looking at the distributions for MTB± (mean time between fail- ure). If the distributions have a small standard deviation, they are usually a candidate for preventive maintenance. 3. Infant mortality refers to the high rate of failures that exists for many products when they are relatively new. 4. Simulation is an appropriate technique with which to investi- gate maintenance problems because failures tend to occur ran- domly, and the probability of occurrence is often described by a probability distribution that is difFcult to employ in a closed-form mathematical solution. 5. Training of operators to perform maintenance may improve morale and commitment of the individual to the job or organiza- tion. On the other hand, all operators are not capable of perform- ing the necessary maintenance functions or they may perform them less efFciently than a specialist. In addition, it is not always cost effective to purchase the necessary special equipment for the operator’s use. 6. Some ways in which the manager can evaluate the effective- ness of the maintenance function include: Maintenance productivity as measured by: or or Machine utilization as measured by: where: A 5 total available operating hours B 5 scheduled downtime C 5 scheduled mechanical downtime D 5 nonscheduled mechanical downtime () ( ) AB CD AB −−+ Actual maintenance hours to do job Standard maintenance hours to do job Maintenance hours Replacement cost of investment Units of production Maintenance hours Effectiveness of preventive maintenance as measured by: 7. Machine design can ameliorate the maintenance problem by, among other actions, stressing component reliability, simplicity of design and the use of common or standard components, simplicity of operation, and provision of appropriate product explanations and user instructions. 8. Information technology can play a number of roles in the maintenance function; among them: Fles of parts and vendors management of data regarding failures active monitoring of system states problem diagnosis and tracking via simulation—pre-testing and evaluation of maintenance policy enabling more precise control to reduce the likelihood of failure enable improved system design. 9. The best response would probably be to enumerate the actual costs, both tangible and intangible, for each practice. Costs of waiting until it breaks to Fx it might include: unnecessary damage to the machine signiFcant down time on the production line random interruption of the production schedule ruined raw materials poor quality of products produced in a time period prior to breakdown frustration of employees costs to repair the machine.
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This note was uploaded on 07/05/2010 for the course OPER 2P91 taught by Professor Eugenekaciak during the Spring '10 term at Brock University.

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ch17_ism[1] - CHAPTER Maintenance and Reliability 17...

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