Abstract
Maintenance time is a critical quantitative index in maintainability prediction. An efficient maintenance time measurement methodology plays an important role in early stage of the maintainability design. While traditional way to measure the maintenance time ignores the differences between line production and maintenance action. This paper proposes a corrective MOD method considering several important ergonomics factors to predict the maintenance time. With the help of the DELMIA analysis tools, the influence coefficient of several factors are discussed to correct the MOD value and the designers can measure maintenance time by calculating the sum of the corrective MOD time of each maintenance therbligs. Finally a case study is introduced, by maintaining the virtual prototype of APU motor starter in DELMIA, designer obtains the actual maintenance time by the proposed method, and the result verifies the effectiveness and accuracy of the proposed method.
Highlights
Maintainability, as an intrinsic property that shows how well a product can be maintained, should be strictly controlled in the design stage
There isn’t a way to verify if the maintenance time can meet maintenance requirements in the design stage
One is that measuring maintenance time by the actual maintenance work relies on physical prototype which is lagged and modifying the design is very difficult in the in the later stage
Summary
Maintainability, as an intrinsic property that shows how well a product can be maintained, should be strictly controlled in the design stage. He found that the time required for skilled personnel to finish a certain basic action is constant This basic scientific theory has developed into a widely used method called the Predetermined Time Standard (PTS), which is the theoretical basis for existing measurement of nonimmersive, virtual human action time. The MOD method is developed initially for formulating standard labor time, which is usually applied in product line, while the action in product line is different from the action in maintenance action, The operation in product lined is relatively easy and usually repetitive and the operator isn’t influenced by many factors, while the maintenance process is complex, for example sometimes the maintenance personnel have to use maintenance tools to operate. The final maintenance time can be got by adding up all maintenance MOD values
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