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MAINTENANCE OF COMPLEX EQUIPMENT ISSUES AND 复杂设备的维护及问题
MAINTENANCE OF COMPLEX EQUIPMENT: ISSUES AND CHALLENGES Professor Pra Murthy The University of Queensland Brisbane, Australia NEED FOR EQUIPMENT Businesses use a variety of equipment to produce output and services Equipment unreliable – failure due to failure of one or more components Most equipment are complex systems (a truck has more than 15,000 components, an aircraft has 4.5 million components) CONSEQUENCE OF FAILURE Failure of equipment results in reduction in availability This in turn results in loss of revenue Aircraft (747): 1 million dollars per day Other indirect costs: Delays to production, Loss of good will, Dissatisfied customers etc EQUIPMENT FAILURE Equipment failures depend on inherent reliability which is determined by the decisions made during design and manufacture Equipment degrade with age and usage The rate of degradation depends on usage intensity, operating environment, and maintenance actions RELIABILITY THEORY Reliability theory deals with the study of equipment degradation and failures It includes Reliability Science, Reliability Engineering, Reliability Management and Reliability Mathematics Maintenance is also part of reliability theory – needed for coping with unreliability MAINTENANCE Maintenance are actions (or activities) needed to (i) control equipment degradation and failures and (ii) to restore a failed equipment to operational state. The former is termed Preventive Maintenance (PM) and the latter as Corrective Maintenance (CM) APPROACHES TO MAINTENANCE Changed significantly over the last fifty years. Pre 1950: Maintenance was regarded simply as an unavoidable cost Post 1950: Scientific approach to maintenance (mainly OR models - dealing with operational and economic issues) APPROACHES TO MAINTENANCE Post 1970: Maintenance management - Integral to business performance - Part of strategic management - More integrated and pro-active approach - Many approaches (e.g., TPM, RCM, Tero-technology, ILS) have evolved IMPACT
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