Predictive maintenance is the complement of preventive maintenance. Offline since the early 1990s, major interest in socalled online monitoring has started to appear in the industry. Technology has significantly enhanced our ability to detect and monitor the health and condition of critical components in army aviation. Cbm data allows maintenance personnel to perform maintenance at the exact moment it is needed, prior to failure. There is no such thing as monitoring something based on condition. Reissues dod department of defense instruction dodi 4151. The guiding principle of ppm is the regular and systematic application of engineering knowledge and maintenance attention to equipment and facilities to ensure their proper functionality and to reduce their rate of deterioration. An overview of timebased and conditionbased maintenance. A wellorchestrated condition monitoring system is an opportunity for continuous improvement, and the impacts can be dramatic. Tools to prevent equipment failures rendela wenzel, eli lilly and company one of the crucial roles of a reliability engineer is to develop and maintain a longlasting and effective predictive and preventive maintenance program. For example, if an image indicated a difference between a pulley belt temperature. Condition based maintenance in particular can be expensive due to the cost of maintaining sensor devices, so its best used on critically important equipment. Preventive maintenance pm, as scheduled maintenance tends to be called, doesnt prevent anything, navarro says. Conditionbased maintenance was introduced to try to maintain the correct equipment at the right time.
Cbm is based on using realtime data to prioritize and optimize maintenance resources. For example, most people change the oil in their vehicles every 3,000 to 5,000 miles traveled. Such a system will determine the equipments health, and act only when maintenance is actually necessary. Condition monitoring cm is the monitoring of several parameters such as equipment vibration. Condition based maintenance cbm or predictive maintenance is a technology that strives to identify incipient faults before they become critical which enables more accurate planning. More competitive together reduce maintenance costs by standardized solutions and services within condition monitoring. A condition monitoring system enhances safe operation, preserves assets and minimizes environmental impact. Cbm dictates that maintenance should only be performed when certain indicators show signs of decreasing performance or upcoming failure. How and why is this ability to detect and visualize an objects temperature proile. I condition based maintenance cbm i condition monitoring required, more appropriate scheduling. I maintenance is performed when the unit reaches age t. You will recall that preventive maintenance is time based. Implementing conditionbased maintenance using realtime. The paper discusses how the tbm and cbm techniques work toward maintenance decision making.
Condition based maintenance cbm is a maintenance strategy that collects and assesses realtime information, and recommends maintenance decisions based on the current condition of the system. This relatively new approach to maintenance uses data drawn during operations andor maintenance intervals to forecast the need for additional or future maintenance. With the advent of smallscale computing technology, such as embedded sensors in valuable equipment, companies can now engage in condition based maintenance. Then, based upon this factual information foundation, reliability engineering begins. Condition monitoring is a central part of a condition based maintenance strategy. The purpose of this paper is to demonstrate how internet of things iot technology can enable highly distributed elevator equipment servicing by using remotemonitoring technology to facilitate a shift from traditional corrective maintenance cm and time based maintenance tbm to more predictive, condition based maintenance cbm in order to. These principal maintenance strategies, rather than being applied independently, are integrated to take advantage of their re. Condition based monitoring is an accepted feature of many industries. In recent decades, research on cbm has been rapidly growing due to the rapid development of computer based monitoring technologies. Cbm is a set of maintenance actions based on realtime or nearreal time assessment of equipment condition which is obtained from embedded sensors it allows.
Implement an optimum mix of maintenance technologies e. Reductions in the total labor needed to maintain facilities in the required condition 5. This will allow maintenance to be scheduled based onequipment condition and not time. A comparison of timebased maintenance and condition. The cbm philosophyit is about utilising the condition monitoring technologies topredict the failure patterns of an asset. Cbm is theory used in the industry and government to actively monitor the health of the components or system in order to optimize operating costs and determine maintenance needs. This paper presents an overview of two maintenance techniques widely discussed in the literature. Bleymaier director of logistics, engineering, and force protection headquarters, air mobility command. Choose the maintenance strategy which gives maximum reward.
Condition based maintenance 1996 page 3 of 11 online vs. As it is normally used, pm minimizes downtime only. The condition based maintenance data eliminated the need for many of the repairs that would normally have been included in the maintenance outage. Condition based maintenance and condition monitoring. Maintenance instructions based on actual condition and usage. Observing the state of the system is known as condition monitoring. Conditionbased maintenance cbm is a maintenance philosophy used by industry to actively manage the health condition of assets in order to perform maintenance only when it is needed and at the most opportune times. Navy surface ship rcm processes zclassic rcm initial maintenance requirements development zbackfit rcm surfmer program institutionalizing rcm discussion. Pdf condition based maintenance byron ellis academia. Internet of things enabling conditionbased maintenance in. Physical inspections are reduced or eliminated cbm working group cbm program objectives are. Though the term is used in industry, it is used incorrectly. The pf curve condition based maintenance is a preventive maintenance tactic which utilises condition monitoring as a data gathering technique to assess the health of critical assets at a facility. In manufacturing, its application has been somewhat muted.
Conditionbased maintenance is a predictive maintenance strategy where various elements of an operating asset are observed and measured over time to identify and prevent deterioration and possible failure at the earliest possible moment. Reliabilitycentered maintenance methodology reliabilitycentered maintenance rcm is the optimum mix of reactive, time or interval based, condition based, and proactive maintenance practices. Maintenance policies i time based maintenance tbm i easy to implement, no condition monitoring needed. Implementation strategies and tools for condition based. Condition based maintenance, which is predictive in nature, is part of condition based monitoring. An introduction to condition based maintenance cbman approach to cbm application and management by. Conditionbased maintenance cbm is a maintenance strategy that monitors the actual condition of an asset to decide what maintenance needs to be done. By combining these technological advances with the existing systems for vibration analysis, we have developed a. The condition based maintenance plus approach to maintenance. The goal of a cbm implementation is to move from a calendar based preventive. Condition based maintenance cbm uses sensor devices to collect realtime measurements ie.
The overall benefits of condition based maintenance management have proven to substantially improve the overall operation of both manufacturing and process plants. One issue is to implement the conditionbased maintenance cbm approach that makes a diagnosis of the asset status based on wire or wireless monitored data, predicts the assets abnormality, and. Infrastructure and configuration required to turn diagnostics into information. Condition based maintenance cbm offers the promise of enhancing the effectiveness of maintenance programs in a way that no other single concept has ever matched. Cbm is maintenance based on evidence of need, and rcm provides the rules of evidence. The paper discusses how the tbm and cbm techniques work toward maintenance decision. Department of defense instruction under secretary of. Condition based maintenance also known as cbm is a maintenance methodology in which maintenance operations are performed depending on the current condition of your assets. This text attempts to present the fundamental justification for condition based maintenance together with enough analytic and practical guidance for its implementation. Condition based monitoring cbm and predictive maintenance pm are two maintenance strategies which aim at optimizing equipment efficiency and reducing service timing and costs during equipment lifecycle. Cbm can drastically reduce operating costs and increase the safety of assets requir ing maintenance.
Condition based maintenance is the process of monitoring the condition of an asset and taking an action to avoid the consequences of a failure. The concept, quite correctly, is based on the belief that if equipment can be evaluated, and. Both predictive and condition based maintenance can be expensive to initiate, though they both justify their upfront cost by saving money on downtime and equipment maintenance. The complete conditionbased maintenance cbm guide fiix. Effectiveness of condition based maintenance in army aviation, by maj marc p. Condition based maintenance cbm, also known as predictive maintenance, is a maintenance practice that derives maintenance requirements, in large part, from realtime assessment of platform or weapon system condition obtained from embedded sensors andor external tests and measurements using builtin diagnostic equipment. Predictive maintenance and conditionbased monitoring. Under cbm, maintenance only occurs when data indicates a decline in performance or the early warning signs of failure. Conditionbased maintenance and machine diagnostics.
353 1413 257 36 781 1100 831 15 1 872 1132 521 1081 405 255 1458 211 967 518 301 262 382 896 884 917 584 1255 993 462 1006 395 169 754 180 27 255