The testability modeling and model conversion technology based on multi-signal flow graph

Along with the increase of the level of complexity, integration and intelligence of system, prognostics and health management technology (PHM) has gotten more and more attention and application. The technology has become the key technology of increasing the reliability, testability, maintainability, supportability and safety of complex system. Doubtless the higher requirements are put forward to the testability technology. The testability modeling and model conversion technology are more and more emphasized by the product designer with widespread application for design for testability. In this paper, the testability modeling and model conversion technology based on the multi-signal flow graph are introduced. After describing the basic principle of testability model, the paper discussed the method of testability modeling and analysis and the method of model conversion. Finally, by using a PDU controller of momentum drive equipment of some airplane, it is validated that the methods are valid. At the same time, results show that the methods are feasible and effective in the design for PHM of modernized equipment.