Abstract:
An integrated model of maintenance planning and statistical process control is developed for a production process. The process has two operational states including an in-control state and an out-of-control state, where the process failure mechanism is supposed as a general continuous distribution with non-decreasing failure rate. Based on the information obtained from the control chart, three types of maintenance actions may be implemented in the process. The integrated model optimally determines the parameters of the control chart and maintenance actions so that the expected cost per time unit is minimized. To evaluate the performance of the integrated model, a stand-alone model is developed. In the stand-alone model, only maintenance planning is considered. Finally, a real case study is presented to clarify the performances of these models.
Machine summary:
The integrated model optimally determines the parameters of the control chart and maintenance actions so that the expected cost per time unit is minimized.
Integrated models of MM and SPC can be classified based on different criteria, such as type of the control chart employed for the process monitoring, process failure mechanism, number of the process states, inspection policy applied to the process monitoring, impact of the maintenance on the process, and maintenance policy in different situations.
2014), chi-square chart(Wu and Makis 2008) (Hasan Rasay, Fallahnezhad, and Zare Mehrjerdi 2018), cause-selecting control chart (Jianlan Zhong & Yizhong Ma 2017), and exponential weighted moving average (EWMA) chart ((Charongrattanasakul and Pongpullponsak 2011),(Abouei Ardakan et al.
From the perspective of process failure mechanism, in some integrated models, it is assumed that the probabilities of process transitions between different states are based on an exponential distribution ((Liu et al.
Some models are developed based on the Weibull distribution ((Zhou and Zhu 2008),(Linderman, McKone-Sweet, and Anderson 2005)), and in some research studies, it is supposed that the failure mechanism follows a general distribution ((S.
In some integrated models, the effect of maintenance on systems is supposed to be perfect ((Linderman, McKone-Sweet, and Anderson 2005),(Sofia Panagiotidou and Tagaras 2010),(Abouei Ardakan et al.
In the integrated model, based on the information obtained from the control chart, different types of maintenance actions are possible to be implemented in the process.