Research On Selection Optimization Of Testability Parameters For Equipment

Testability takes an important part at development of equipment. A suitable set of testability parameters(TFOM, test figure of merit) is acquired to describe the testability characteristics for testability design. Now, the TFOMs lack widely accepted standard and the number is large. Some TFOMs'definitions are ambiguous and overlapped and correlations exist among them. So they are difficult to control in design and could hardly be validated in operation. Then, it is essential to get a logical set of TFOMs. A practical method of selection optimization of TFOMs is needed. Supported by one advanced project, the selection optimization of TFOMs for equipment is researched in this dissertation. The main contents are shown as follows:1. The influencing factors of TFOMs are analyzed. The basic concept of TFOM is analyzed, and the whole set of TFOMs is sorted. This shows the need of TFOMs optimization. Then, the influencing factors of TFOMs are analyzed from the definition factor, test factor and project factor.2. A method of TFOMs selection is proposed to reduce the large number of TFOMs. The process of the method is introduced firstly. The relationship between the equipment requirements and TFOMs is analyzed which can be used to check the TFOMs. Then, the TFOM correlations are analyzed which can be used to select the TFOM.3. A method of TFOMs optimization is proposed. The importance and cost of the TFOMs are analyzed and calculated with fuzzy evaluation. Then, the set of TFOMs is optimized according to the importance and cost.4. Based on the above method, a TFOMs'selection software is programmed. The method and software are used and validated in the missile control system. The results show that the method and software can achieve the TFOMs'selection effectively.