Research On Testability Virtual Verification Technology And Applications In Heading And Attitude System Of Helicopter

Testability is a crucial characteristic of equipments. Testability verification is a primary and widely used instrumentality to evaluate whether the testability level is satisfying with the requirements stated in the contract.Up to now, testability verification is mainly carried out with the physical test based on fault injection. Practice shows that the physical test has the deficiencies such as the difficulty in fault injection, high risk and cost, long testing period and so on. As the development of modeling and simulation technology, more and more attention has been paid to the Testability Virtual Verification (TVV). However, there are still many problems to research such as TVV flow deciding, testability virtual prototype modeling, fault samples generation, synthesize evaluation and so on. Focus on these issues, the TVV technology is researched and applied to one in this paper.The major contents of the dissertation are as follows.1. Focus on the indeterminacy to the TVV implement flow, the differences between testability physical test verification and virtual test verification are analyzed. Based on the implement flow of physical test, the implement flow of virtual test is proposed. Then, some crucial technology points of TVV are construed. It supplies the guidance to the research on the TVV technology and application on the Built-in test (BIT) of heading and attitude system in certain helicopter.2. Because neither the traditional testability model nor traditional functional virtual prototype can meet the requirement of TVV, the components of testability virtual prototype and the interrelation among the components are studied. Meanwhile, the testability virtual prototype modeling method and flow are described. The basic of TVV, Configuration-Function-Fault-Test-Environment integrated model of the heading and attitude system is set with the software Multisim10.3. In order to obtain the fault injection samples used in the testability verification, a new approach considering the effects of environment stress and maintenance to generate fault samples sequence is proposed based on the Monte Carlo simulation. The implement flow of simulation method is put forward and used to generate the fault injection samples of heading and attitude system. 4. In order to improve the conclusion confidence level of the virtual verification, an integrated evaluation method considering both the physical and virtual test data is put forward. The simulation information creditability analysis theory and the testability index evaluation method based on Bayes are discussed. At last, the virtual test and the index evaluation method are carried out on the heading and attitude system. Compared with other evaluation methods, the approach is demonstrated to be feasible and effective.