基于SSTDR技术的战机电缆隐性故障检测仿真分析

Feasibility Simulation Analysis of Stealth Fault Detection of Fighter Cable Based on SSTDR Technology

飞机尤其是战机电缆故障会造成重大事故和财产损失,实际飞机制造、维护和修理中电缆隐性故障的发现和排除是一项重要而又困难的工作。首先对国内外电缆隐性故障检测技术进行综合分析论述。断路故障和短路故障是航空电缆中最为常见的故障类型,但由于战机线缆多段、多接头的特性使得检测信号会发生衰减和扰动变形,传统的信号时域反射(TDR)方法对电缆的故障定位存在误差。针对航空电缆中断路和短路这两种故障类型提出了扩展频谱时域反射的方法(SSTDR),该方法利用检测信号反射的延迟特性来定位系统中故障点,从而有效避免测试信号衰变对故障定位的影响。最后使用仿真技术对不同损伤状态进行仿真分析,形成理论结果,供相关技术人员学习参考。

Cable faults of aircraft, especially fighter aircraft, can cause serious accidents and property losses.It is an important and difficult work to find and eliminate hidden cable faults in actual aircraft manufacturing, maintenance and repair.Firstly, the cable recessive fault detection technology at home and abroad is analyzed and discussed.Circuit breaker and short circuit fault are the most common fault types in aviation cables.However, due to the multi-segment and multi-joint characteristics of aircraft cables, detection signals will attenuate and perturb deformation, and the traditional signal time domain reflectometry(TDR) method has errors in cable fault location.Based on this, the spread spectrum time domain reflectometry(SSTDR) method is proposed for the two fault types of aviation cable interruption and short circuit.It uses the delay characteristic of detection signal reflection to locate fault points in the system, so as to effectively avoid the influence of test signal decay on fault location.Finally, the simulation technology is used to simulate and analyze different damage states, and the theoretical results are formed for the reference of relevant technicians.