Two-Stage Inspection Model Based on a Three-Stage Failure Process

• Published in: 东华大学学报（英文版） Vol. 33; no. 2; pp. 215 - 218
• Main Author: 杨瑞锋 康建设 王广彦
• Format: Journal Article
• Language: English
• Published: Department of Management Engineering, Mechanical Engineering College, Shijiazhuang 050003, China 30.04.2016
• Subjects: preventive maintenance (PM); delay time; two-stage inspection; three-stage failure process
• ISSN: 1672-5220

As the non-periodic inspections are common in practice,a two-stage inspection model based on a three-stage failure process is proposed. The two-stage inspection means that the system is inspected with the first inspection interval T_1 and the second inspection interval T_2. Because of the three color schemes commonly used in industry,three stages are divided by the system lifetime：normal, minor defective and severe defective stages. Upon the failure of the system,replacement is carried out. Maintenance is done once identifying the severe defective stage. However,when the minor defective stage is identified by the second inspection interval T_2,action of halving the subsequent inspection interval is adopted.Otherwise,no action is required. Our objective function is to optimize the inspection intervals so as to minimize the expected cost per unit time. Finally,a numerical example is presented to illustrate the effectiveness of the proposed model.