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Table of Contents
1.0 Summary............................................................................................................................................ 2
2.0 Introduction....................................................................................................................................... 3
3.0 Review of Research Works on Maintenance Strategy Selection ...................................................... 3
4.0 Comparative Study of Maintenance Strategies................................................................................. 4
5.0 Selection of Criteria and Sub-Criteria................................................................................................ 5
6.0 Conclusion ......................................................................................................................................... 5
7.0 References......................................................................................................................................... 6
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1.0 Summary
Maintenance strategy plays a very important role in all kind of manufacturing industries. Each
maintenance strategy has their characteristics, importance and drawbacks. Performance of a
machine depends on the type of maintenance strategies employed on it. Machines used in industries
need proper maintenance because failure of machine may cause the production loss. Maintenance
strategy may vary from one machine to another machine because of the various conflicting factors
like safety, cost, customer satisfaction etc. Factors affecting machines performance need to be
identified and controlled. Use of inappropriate maintenance strategy may increase the maintenance
cost. Increase in maintenance cost will increase the production cost.
Selection of a maintenance strategy to a particular machine or group of machines is a problem of
decision making and it is always a challenging task for maintenance Manager/Engineer. By using the
decision making tools, this problem can be solved. It also facilitates to calculate the weight of factors
through which decision maker can analyze the difference between actual condition and required
condition. Present project paper shows that the problem of selecting an optimum maintenance
strategy to a machine can be overcome by using decision making tool.
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2.0 Introduction
Maintenance has emerged since the construction of physical structures such as ships and machines.
In general, maintenance is defined as the combination of all technical and administrative actions,
including supervision and action indented to retain the machine or restore it to a state in which it can
perform a required function. Effective maintenance ultimately aims to determine suitable action’s
that can keep machine performance at acceptable level and extend the life cycle of the machine.
Different types of maintenance alternatives have been proposed to achieve the ultimate goal.
However, a maintenance policy implemented in a similar machine but in different manufacturing
environments may not produce similar results because of various operating factors such as humidity,
temperature and work load. In addition, decision making in maintenance selection is often
accompanied by diverse constraints and economic perspectives. Examples of these constraints
include operator safety issues, government regulation, resource limitation and budget, consequently
the selection of a suitable maintenance policy becomes a crucial decision making process to obtain
high levels of success for the firm beneficiaries in manufacturing industry.
3.0 Review of Research Works on
Maintenance Strategy Selection
In last few decades there were lots of research work had been done all over the world on
maintenance strategy selections. Few of them are introduced in this project paper. M. Bevilacqua et
al. (March 2000), the research work is all about the selection of maintenance strategy in a plant
which is still in construction phase. Possible alternatives are considered preventive, condition based,
corrective and opportunistic maintenance. There are approximate 200 facilities for which best
maintenance policy have to select. The machines are clustered in three homogeneous groups after a
criticality analysis based on internal procedures of the oil refinery. Several aspects, which
characterize each of the above mentioned maintenance strategies, are arranged in hierarchic
structure and evaluated using only a series of pair wise judgments.
Massinio Bertolin et al. (2005) presents a Lexicographic goal programming (LGP) approach to define
the best strategies for the maintenance of critical centrifugal pumps in an oil refinery for each pump
failure mode , the model allows to take into account the maintenance policy Borden in terms of
inspection or repair and in terms of the manpower involved , linking them to efficiency risk as peats
quantified as in FMECA methodology through the use of the classic parameter occurrence , severity
and detestability.
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4.0 Comparative Study of Maintenance
Strategies
When there is need to identify the various alternatives to take in consideration for the selection
of best maintenance strategy, it is always helpful to compare the alternatives by important factors
like philosophy, reliability level, percentage in use, advantages, disadvantages etc. It simplifies the
understanding between various points and conditions.
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5.0 Selection of Criteria and Sub-Criteria
Selection of criteria is also a very important factor in the process of selecting the best maintenance
strategy. Criteria’s which highly influence the performance of machine or to achieve the goal of
company, need to be analyzed very carefully. Multi-Criteria Decision Making tools facilitate to rank
these criteria’s with respect to the others. Most general criteria and sub criteria for manufacturing
industries.
According to Ling Wang (2007), the important criteria’s and sub-criteria’s are classified in table
form.
6.0 Conclusion
This project paper aims to show how a typical problem of maintenance strategy selection can be
simplified by using a decision making tools. Using the advantages and facilities of MCDM methods
helps to control the factor which influences to achieve the goal of company. In this paper review of
various researches suggest that large scope of applicability of MCDM methods. Comparative study of
alternatives can help to understand the condition of problem and also at the time of decision making
i.e. to fulfill questionnaire part for data collection.
Selection of any criteria is also a challenging task but it can be well estimated by review of various
research studies at different conditions in different companies. It can be concluded at the end of this
research paper that for the general problem of maintenance strategy selection above steps can be
taken in the account and along with this sensitivity analysis can also be implemented so that
influence in output can be measured by changing the criteria weight.
Chapt
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7.0 References
[1] M. Bevilacqua, M. Braglia(2000), The analytic hierarchy process applied to maintenance strategy
selection, Reliability Engineering and System Safety 70 (2000) 71–83
[2] Massimo Bertolini, Maurizio Bevilacqua(2005), A combined goal programming – AHP approach to
maintenance selection problem, Reliability Engineering and System Safety 91 (2005) 839-848
[3] Ling Wang, Jian Chu, Jun Wu, 2007, Selection of optimum maintenance strategies based on a
fuzzy analytic hierarchy process, Int. j. Production Economics 107(2007) 151-163-50
