航空电连接器典型失效模式及影响分析

发布时间：2018-03-18 01:20

本文选题：电连接器　切入点：弯针　出处：《南京航空航天大学》2016年硕士论文　论文类型：学位论文

【摘要】：电连接器作为电气线路互联系统(Electrical Wiring Interconnection Systems,EWIS)的重要部件,用于实现电信号的传输和控制以及电子与电气设备之间的电连接,其可靠性直接影响到EWIS能否稳定的工作以及飞机的安全飞行。本文针对航空电连接器的典型失效模式及影响进行研究,主要完成以下工作:首先,以某型航空电连接器为例,给出了一种弯针分析的方法并利用MATLAB GUI开发了弯针分析软件,该软件可计算不同类型电连接器在多种弯针失效模式下的短路、断路失效率。此外,通过对弯针失效的电连接器建立电路模型定量分析并仿真验证了弯针失效对电连接器接触对间传递信号的干扰作用。其次,在对电连接器间歇性失效机理研究的基础上,提出了一种基于元胞自动机算法模拟电连接器间歇性失效过程的方法,最终仿真得到电连接器的间歇性失效曲线。此外,建立电连接器间歇性失效时的电接触阻抗模型和电路模型,定量分析并仿真验证了电连接器间歇性失效对高频传输信号的衰减作用。然后,针对航空电气系统中单个电连接器间歇性失效的检测问题,提出了一种基于自适应滑模观测器的失效检测方法。该方法通过等价误差介入原理获取电连接器特征参数的具体信息,从而可直接判断出电连接器是否失效,避免故障误报和漏报。仿真结果表明了设计方法的有效性。最后,针对多个电连接器间歇性失效的检测问题,提出了一种结合奉献观测器和滑模观测器策略的方法。该方法采用奉献观测器隔离出可能失效的电连接器,并通过滑模观测器对定位出的电连接器的特征参数和系统中的扰动同时进行重构。仿真结果表明设计的方法可提高多失效检测的准确度。
[Abstract]:As an important component of Electrical Wiring Interconnection Systems (EWIS), electrical connectors are used to realize the transmission and control of electrical signals and the electrical connection between electronic and electrical devices. Its reliability directly affects the stability of EWIS and the safe flight of aircraft. In this paper, the typical failure modes and effects of avionics connectors are studied. The main works are as follows: first, take a certain type of aircraft electrical connectors as an example. A bending needle analysis method is presented and a bending needle analysis software is developed by using MATLAB GUI. The software can calculate the short circuit and break failure rate of different types of electrical connectors under various bending pin failure modes. Through the quantitative analysis of circuit model of electric connector with bending needle failure and simulation, the interference effect of bending needle failure on contact signal transfer between electric connector is verified. Secondly, based on the research of intermittent failure mechanism of electric connector, A method of simulating the intermittent failure process of electrical connectors based on cellular automata algorithm is proposed. Finally, the intermittent failure curves of electrical connectors are obtained by simulation. The electrical contact impedance model and circuit model for intermittent failure of electrical connectors are established. Quantitative analysis and simulation verify the attenuation effect of intermittent failure of electrical connectors on high-frequency transmission signals. In order to detect the intermittent failure of single electrical connector in aeronautical electrical system, A fault detection method based on adaptive sliding mode observer (ASO) is proposed, in which the specific information of the characteristic parameters of electrical connectors is obtained by the principle of equivalent error intervention, and the failure of electrical connectors can be directly determined. The simulation results show that the design method is effective. Finally, aiming at the intermittent failure detection of multiple electrical connectors, In this paper, a method of combining dedication observer with sliding mode observer strategy is proposed, which is used to isolate electrical connectors that may fail. The characteristic parameters of the located electrical connector and the disturbance in the system are reconstructed simultaneously by the sliding mode observer. The simulation results show that the design method can improve the accuracy of multi-failure detection.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：V242

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