JUST IN TIME DYNAMIC & COST-EFFECTIVE MAINTENANCE (JIT DMAINT) FOR MORE RELIABLE PRODUCTION: A CASE STUDY

Basim Al-Najjar

doi:10.5937/jaes10-2132

Basim Al-Najjar School for Engineering, Linnaeus University, Sweden

DOI: https://doi.org/10.5937/jaes10-2132

Keywords: prediction of vibration level, dinamyc and cost-effective maintenance, Just in time maintenance, probability,

Abstract

Using CM, we have past data for describing damage initiation & development and
current data for describing the current condition of a component/machine. Data describing
possible behaviour of the condition in the close future are usually lack in the available
commercial systems although it is important for planning production/maintenance actions,
reducing failures/accidents, & consequently reducing losses & production cost. In general,
accurate maintenance decisions prolong life length of components/machines and maintain
production continuity which adds competitive advantages. When CM parameter exceeds a
significant (warning) level, it demands a clear understanding of what happened to avoid
failures. Also, reliable answers concerning; what is the probability of failure of a component,
its residual life and when is the most profitable time of conducting maintenance are necessary.
In this paper, a new innovative eMDSS consists of three strategies for cost-effective
maintenance & production processes is introduced and discussed. The major focus is given on
one strategy (Accurate Maintenance Decisions). This strategy offers opportunity to achieve
Just on Time Dynamic & Cost-effective Maintenance by selecting the most profitable time for
maintenance is developed, tested in case companies and discussed. It offers unique solutions
to increase maintenance profitability by enhancing maintenance decision accuracy via;

1. Predicting the value of CM parameter, e.g. vibration, level, PreVib.

2. Estimating the probability of failure at the close future and component residual life,
ProLife.

3. Using this new information, it will easily estimate the most profitable time for
maintenance action.

Accurate Maintenance Decisions provides data about future situation in addition to the
current & past data, which is necessary for production and maintenance successful planning.
This toolset; predicts the vibration level (PreVib), assesses the probability of failure of

equipment and its residual life (ProLife), and consequently it becomes possible to determine the best time of maintenance action. It has been tested in several Swedish and European companies within the branches of car manufacturing, production machine manufacturer and process industry. This study was partly funded by EU-IP DYNAMITE (Dynamic Decisions in Maintenance ) 2005-2009 and partly by E-maintenance Sweden AB. The major conclusions are; applying this toolset it is possible to reduce failures appreciably, prolongs the life length of components/equipment, and perform profitable maintenance.