IJE TRANSACTIONS A: Basics Vol. 31, No. 4 (April 2018) 204-211    Article in Press

PDF URL: http://www.ije.ir/Vol31/No4/A/3.pdf  
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H. Rasay, M. S. Fallah Nezhad and Y. Zare Mehrjardi
( Received: May 28, 2017 – Accepted: October 12, 2017 )

Abstract    Condition monitoring is the base of condition based maintenance (CBM). It is usually required a stochastic model for relating the obtained information from condition monitoring to the actual state of the system. On the other hand, considering the interactions and similarities that exist between CBM and statistical process control (SPC) the integrated models for CBM and SPC have been developed. These models apply the control charts as a condition monitoring technique and inference about the operational states of the system is based on the collected information about the quality of the produced items. Finally, it is decided whether to implement certain type of maintenance actions. This paper describes the application of multivariate control charts as a condition monitoring technique for CBM purposes. To this end, an integrated model is developed while it is used a chi – square control chart as well as a constant hazard policy is applied for determining the inspection time points.


Keywords    condition - based maintenance; statistical process control; chi square control chart; multivariate control chart


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