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Figure 8a: Membership function of Frequency Figure 8b: Membership function of Downtime Figure 9a: Output (strategies) membership function Figure 9b: The nine rules of the DMG. Figure 10: The Fuzzy Decision Surface. Towards an Intelligent Holonic Maintenance System 66
67 Towards an Intelligent Holonic Maintenance System Figure 11: The Fuzzy Decision Surface Showing The Regions of Different Strategies The DMG could be used for practical continuous impro v e m e n t p rocess because when machines in the top ten have been addre s s e d , they will then, if and only if, appropriate action has been takes, move down the list of top ten worst machines. When they move down the list, other machines show that they need improvement and then re s o u rces can be directed towards the new offenders. If this practice is continuously used then eventually all machines will be ru n n i n g optimally. If problems are chronic, i.e. regular, minor and usually neglected; some of these could be due to the incompetence of the user and thus skill level upgrading would be an appropriate solution. However, if machines tend towards RCM then the problems are more sporadic and when they occur could be catastrophic. Uses of maintenance schemes such as FMEA and FTA can help determine the cause and may help predict failures thus allowing a prevention scheme to be devised. F i g u re (12) shows when to apply TPM and RCM. TPM is appro p r i a t e at the SLU range since Skill Level Upgrade of machine tool operators is a fundamental concept of TPM. Whereas, RCM is applicable for machines exhibiting severe failures (high downtime and low f requency). Also CBM and FMEA will be ideal for this kind of machine and hence a RCM policy will be most applicable. The significance of this approach is that in one model we have RCM and TPM in a unified model rather than two competing concepts. Generally the easy Preventive Maintenance (PM), Fixed Ti m e Maintenance (FTM) questions are Who, and When (eff i c i e n c y questions). The more difficult ones are What and How (effectiveness questions), as indicated in the figure (13). Conclusion The main idea is based on the fact that the 'black hole' or missing functionality in conventional CMMSs is intelligent decision analysis tools. A model has been proposed based on the Analytic Hierarc h y P rocess (AHP) combined with Fuzzy Logic Control (FLC) to render a 'Decision Making Grid'. This combination provides features of both fixed rules and flexible strategies. This grid supports the decision making process on how assets should be maintained; directing the business to choose to run out to failure, upgrade operator skills, choose fixed time maintenance, or to design out the causes (as examples of such policies). It then gives a prioritised focus within the scope of the suggested policy in order to dynamically adapt maintenance plans through the perf o rmance of trade-off comparisons in a consistent approach. The basic data requirements being simply, for example: the asset register, a fault counter, and timer, and a hierarchical fault tree. The role of each requirement is as follows: - Asset Register (Machine identifier). This is to identify different machines and plants. - Counter of Faults (Frequency). This is the first criterion used by the DMG. It could be obtained from any CMMS or using Programmable Logic Controllers (PLCs). - Timer of Faults (Down-time). This is the second criterion used by the DMG. It could be obtained from any CMMS or using Programmable Logic Controllers (PLCs). - Level of Faults (Hierarchical). This is important for the AHP model. Here the combination of structured fault codes and flexible description needs to be considered. These basic re q u i rements are usually easy to find in existing CMMS. It is therefore proposed that such a model could be attached as an intelligent module to existing CMMSs in order to transfer a black hole concept to an intelligent black box that adds value to the business.
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The Entek product family - complete
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May Editorial The annual survey of
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Financials Products Production Stor
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RCMeasy... Workshop and Software $1
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those basic needs or standards are
Page 16 and 17:
Hugh Blackwood 6 of Alcoa’s Mt Ho
Page 18 and 19: T h i rd l y, Pareto analysis of eq
Page 20 and 21: THE COMPLETE INFRARED CM/PM PACKAGE
Page 22 and 23: acute failures; repair costs for th
Page 24 and 25: It can be seen that significant imp
Page 26 and 27: congestion, accidents, injuries or
Page 28 and 29: with the detailed life cycle costin
Page 30 and 31: oot causes to be identified and rel
Page 32 and 33: New Generation Of Reliability Tools
Page 34 and 35: New Generation Of Reliability Tools
Page 36 and 37: For example, one of the most celebr
Page 38 and 39: MERIT draws data from the Marine’
Page 40 and 41: d i s c re p a n c y. The short par
Page 42 and 43: p roblems, and getting their ideas
Page 44 and 45: M E X M A I N T E N A N C E M A N A
Page 46 and 47: system performance and efficiency.
Page 48 and 49: CMMS DETAILS - Functionality C H A
Page 50 and 51: Fax: (905) 844-0347 Email: mcudmore
Page 52 and 53: Typical cost of the CMMS software S
Page 54 and 55: Available as a stand-alone system.
Page 56 and 57: Ivara EAM Company: Ivara Corporatio
Page 58 and 59: Small site: $3,000 Medium Site: $40
Page 60 and 61: MicroMain’s CMMS and modules are
Page 62 and 63: Available as a stand-alone system.
Page 64 and 65: Towards An Intelligent Holonic Main
Page 66 and 67: 1200 1000 800 600 400 200 Breakdown
Page 70 and 71: Decision Making Grid (DMG) Decision
Page 72 and 73: Table 1 What type of industry does
Page 74 and 75: Table 9 Can your condition based mo
Page 76 and 77: KEY WHAT WHY Check packing to see i
Page 78 and 79: • Laser range of 20m (40m diamete
Page 80 and 81: systems, and provided the turn-key
Page 82 and 83: (RCA), and risk based inspection (R
Page 85 and 86: Maintenance 2004 Seminars Course On
Page 87 and 88: Course Two Maintenance Planning Adv
Page 89 and 90: The seminar is presented by Len Bra
Page 91 and 92: E F F I C I E N C Y Maintenance Exp
Page 93 and 94: To speed registration, please provi
Page 95 and 96: SHUTDOWNS AND TURNAROUNDS Day One:
Page 97: Separately Bookable Post-Conference
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May - Library

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