The University of Tokyo Department of Mechanical Engineering,Fracture Mechanics Laboratory.SAKAI & IZUMI group.

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Optimization of the maintenance program of escalators using risk assessment

The maintenance program for escalators is basically done in time-based concept. The inspection periods are determined for each item which is composed of plural parts; however, this inspection interval is based on experiences and does not have clear scientific grounds. In order to rationalize the maintenance program, the application of available data such as failure reports given by customers, and inspection data reported at periodical maintenance is extremely important. Unfortunately, this information is not necessarily utilized sufficiently at this moment. In this research, we try to quantify risk by calculating failure rate of each maintenance item using statistical method and by defining consequence accompanied by failure. Finally, we develop the method of optimizing the maintenance program based on risk.


Fig. R-map of Each Inspection Group








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