机载设备测试性建模与应用

The application and analysis of testability simulation of airborne equipments

摘要:

测试性模型是进行测试性仿真、设计、分析、评估的基础和关键。该文描述了设备测试性建模方法与测试性建模流程，为实现对复杂系统的测试性分析及故障诊断，获取有指导意义的诊断策略服务实际应用。测试性设计中采用多信号流建模技术，分层次建立某型机载音频设备的测试性模型；对设备故障模式、故障影响的分析归纳，收集各层级设备故障模式样本形成FMEA分析表；运用计算机建模仿真工具辅助，构建了定量化的测试性模型；通过模型仿真获得被测设备故障检测率、隔离率以及相关故障诊断流程；经测试性指标对比分析及测试性试验验证，发现该测试性模型中薄弱环节，经过迭代模型、改进测试性方案后，显著提高了设备的测试性指标，满足设备的应用使用需求。

Abstract:

Testability model is the basis and key in implementing testability simulation, design, analysis and evaluation. This paper introduces the modeling methods of equipment testing and the testing procedure in simulating software, to achieve the purposes of realizing the testing analysis and failure diagnosis of complex system, and obtaining instructive application of diagnostic policy service. The testability design adopts the modeling technology of multi-signal flow, and establishes the testability model of airborne audio equipment of a certain flight in a hierarchical way. By analyzing and inducing the failure modes and effects, collecting the failure mode samples as the FMEA analysis report, it establishes quantitative testability model with the help of computer modeling and simulation tool, and obtains its rates of failure detection and isolation and relative failure diagnosis process through modeling and simulation. The weak link of this testability model is discovered through comparative analysis of testability indicators and testability experimental verification. The testability indicators of the equipment are improved significantly with model iteration and improved testability plan to meet the needs of application of the equipment.