Om0015

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  • Topic: Maintenance, Decision making, Mean time between failures
  • Pages : 11 (3356 words )
  • Download(s) : 101
  • Published : February 24, 2013
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Q1.
a. What Maintenance policies to be pursued by the operations manager to reduce failures and improve productivity? Answer:- Manufacturing & Operations Manager with extensive lean manufacturing implementation experience. Accomplished leader of operational excellence and continuous improvement programs. Long history of orchestrating substantial performance leaps and cost reductions in numerous manufacturing facilities across North America. Business minded decision maker relentlessly focused on bringing quality and cost to world class levels. Highly dedicated team builder revered for leading crucial change initiatives while simultaneously winning employee loyalty and trust. Thorough knowledge of all lean manufacturing & total productive maintenance processes, methodologies, and applied best practices. Demonstrated success in turnaround and crisis management, with experience in “right-sizing” operations to improve P&L scenario.

Selectively pursuing plant operations positions in southern Michigan and northern Ohio. Desire organizations in need of a strong "change agent" to drive real operations improvements, while increasing efficiencies and reducing overall costs. b. Explain components of work execution.

Answer:- On a mainframe computer many different applications execute at the same time. The expectations for executing work are consistent execution times and predictable access to databases. On z/OS the Workload Manager (WLM) component fulfills these needs by controlling work's access to system resources based on external specifications by the system administrator. The system administrator classifies work to service classes. The classification mechanism uses work attributes like transaction names, user identifications or program names which specific applications are known to use. In addition the system administrator defines goals and importance levels for the service classes representing the application work. The goals define performance expectations for the work. Goals can be expressed as response times, a relative speed (termed velocity) or as discretionary if no specific requirement exists. The response time describes the duration for the work requests after they entered the system and until the application signals to WLM that the execution is completed. WLM is now interested to assure that the average response time of a set of work requests ends in the expected time or that a percentage of work requests fulfill the expectations of the end user. The definition of a response time also requires that the applications communicate with WLM. If this is not possible a relative speed measure – named execution velocity - is used to describe the end user expectation to the system

Q2.
a. What is meant by MTBF? How this measurement will help maintenance management to understand the conditions of the machines and equipment? Answer:- Mean time between failures (MTBF) is the predicted elapsed time between inherent failures of a system during operation. MTBF can be calculated as the arithmetic mean (average) time between failures of a system. The MTBF is typically part of a model that assumes the failed system is immediately repaired (mean time to repair, or MTTR), as a part of a renewal process. This is in contrast to the mean time to failure (MTTF), which measures average time to failures with the modeling assumption that the failed system is not repaired (infinite repair rate). The definition of MTBF depends on the definition of what is considered a system failure. For complex, repairable systems, failures are considered to be those out of design conditions which place the system out of service and into a state for repair. Failures which occur that can be left or maintained in an unrepaired condition, and do not place the system out of service, are not considered failures under this definition. In addition, units that are taken down for routine scheduled maintenance or inventory control are not considered...
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