道路空-地图像探测控制器可靠性增长设计

Design of Reliability Growth for Air to Ground Graphic Detecting Controller

可靠性历来是航空航天领域关注的焦点之一,可靠性增长是产品设计过程中不断完善的迭代过程,但大多工作都局限于概念或顶层框架的研究,未涉及具体工程实现。以道路空——地图像探测控制器可靠性增长设计为背景,提出了一种基于电路优化的可靠性增长综合设计方法。通过分析控制器硬件电路结构,建立了可靠性结构模型与数学模型,根据模型分析结论对控制器基本可靠度较低的D/A结构驱动电路进行了优化,设计了一种基于动态可编程电压比较器的新型驱动电路。通过可靠性评估,优化后控制器的基本可靠性理论上增长了33.2%。进一步的环境应力筛选等可靠性验证试验表明:通过可靠性增长设计后,控制器不仅满足了系统功能与性能指标及可靠性要求,而且体积、重量、成本等综合性能也得到了提高。

The reliability has always been one of the focuses in the field of aeronautics and astronautics,the reliability growth is a continuous improved iterative process during product design,but most of them are confined to the research of concept or top frame,rather than refer to specific engineering implementation. In this paper,an comprehensive reliability growth design method based on circuit optimization was proposed in the light of reliability growth design of road air-to-ground image detecting controller. The reliability structure model and the mathematical model were established through the analysis of the controller hardware circuit structure,then the D / A structure driving circuit with low reliability of the controller was optimized according to the model analysis conclusion,at last a new driving circuit based on dynamic programmable voltage comparator was presented. Through the reliability assessment,the basic reliability of the optimized controller was increased by 33.2% theoretically. Further reliability verification tests,such as environmental stress screening,showed that： the controller,optimized by the reliability growth design,not only met the system function and performance index and reliability requirements,but also had better comprehensive performances,such as volume,weight,cost and so on.