Key Problems of Virtual Testability Demonstration Based on Digital Twin Technology

Prognostics and system health management (PHM) performance mainly relies on the testability level of equipment. Testability demonstration is very important to verify and assess the testability index. The existing methods based on actual test have several disadvantages, such as lack of fault samples and irrationality of fault samples. The method of virtual testability demonstration which is based on digital twin technology maybe solve those problems. The development of the testability demonstration is summarized and the virtual testability-oriented modeling method is analyzed in this paper. The paper emphasizes the key technology parts in the virtual testability demonstration based on digital twin technology, including the testability-oriented modeling, the generation of fault sample, the test and diagnosis simulation based on digital twin. The methods and models proposed in the paper are of great application value in the testability demonstration and PHM. It also can help the designers to improve design schemes in design stage and truly achieve the integration of design.