Adaptable design is a new design approach to create an adaptable product to replace multiple products for satisfying the different requirements in the product life-cycle. In this research, a method to identify the optimal product considering changes of requirements, configurations and parameters in the whole product life-cycle is introduced. The requirements, configurations and parameters of the adaptable product are modeled as functions of the life-cycle time parameter. The adaptable product is changed to different configurations and parameters to satisfy the different requirements in different life-cycle time periods. The evaluation measures, which are achieved from configurations and parameters, are also changed in different life-cycle time periods. The optimal product, modeled by its configurations and parameters, considering the whole product life-cycle is identified through optimization. A case study is provided to demonstrate how the introduced method can be employed for solving engineering problems.

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