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IJE TRANSACTIONS A: Basics Vol. 31, No. 4 (April 2018) 597-604

 APPLICATION OF MULTIVARIATE CONTROL CHARTS FOR CONDITION BASED MAINTENANCE H. Rasay, M. S. Fallahnezhad and Y. Zaremehrjerdi

( Received: May 28, 2017 – Accepted in Revised Form: October 12, 2017 )

 Abstract    Condition monitoring is the foundation of a condition based maintenance (CBM). To relate the information obtained from the condition monitoring to the actual state of the system, it is usually required a stochastic model. 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 control charts as a condition monitoring technique, and the 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. Also, to determine the inspection time points, a constant hazard policy is applied.

 Keywords    Condition Monitoring; Condition - Based Maintenance; Statistical Process Control; Multivariate Control Chart

 چکیده    اساس سیاست نگهداری و تعمیرات مبتنی بر وضعیت، پایش وضعیت است. معمولا برای ارتباط دادن اطلاعات بدست آمده از پایش وضعیت به حالت واقعی سیستم، نیاز به مدل های احتمالی است. از طرف دیگر، با درنظر گفتن ارتباط نزدیکی که بین نگهداری و تعمیرات مبتنی بر وضعیت و کنترل فرایند آماری وجود دارد، مدل های یکپارچه توسعه داده شده است. این مدل ها از نمودارهای کنترل به عنوان یک ابزار پایش وضعیت استفاده می کنند و استنباط در مورد وضعیت عملیاتی سیستم برمبنای اطلاعات بدست آمده از پایش وضعیت صورت می گیرد. درنهایت تصمیم گرفته می شود که چه نوع تدابیر نگهداری و تعمیراتی به کارگفته شود. این مقاله کاربرد نمودارهای کنترل چند متغیره را به عنوان یک تکنیک پایش وضعیت، در نگهداری و تعمیرات مبتنی بر وضعیت نشان می دهد. در این راستا، یک مدل یکپارچه توسعه داده شده در حالیکه از نمودار کنترل کای اسکوار استفاده می شود. همچنین برای تعیین دوره های بازرسی، یک سیاست تحت عنوان سیاست نرخ خرابی ثابت به کار گرفته می­شود.
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