CAJ | 학술논문

在基于时域反射的飞机导线故障诊断方法中,针对局部故障、连续故障和跨转接头故障反射信号微弱、信号衰减严重而使故障点难以诊断的问题,提出基于时频反射的飞机导线故障诊断方法,使故障更易被发现,提高飞机导线故障检出率.另外,时频反射方法中检测信号易受噪声信号干扰而产生故障误报,因此,特采用小波系数收缩算法对检测信号进行降噪处理,降低飞机导线故障诊断误报率.最后,通过实验验证了该方法的可行性并与时域反射法进行了比较,结果表明基于时频反射的飞机导线故障诊断方法在故障检出率和误报率方面均有明显改善.
재기우시역반사적비궤도선고장진단방법중,침대국부고장、련속고장화과전접두고장반사신호미약、신호쇠감엄중이사고장점난이진단적문제,제출기우시빈반사적비궤도선고장진단방법,사고장경역피발현,제고비궤도선고장검출솔.령외,시빈반사방법중검측신호역수조성신호간우이산생고장오보,인차,특채용소파계수수축산법대검측신호진행강조처리,강저비궤도선고장진단오보솔.최후,통과실험험증료해방법적가행성병여시역반사법진행료비교,결과표명기우시빈반사적비궤도선고장진단방법재고장검출솔화오보솔방면균유명현개선.
An airplane cable faults diagnosis method based on time-frequency domain reflection is proposed to solve the problems of being difficult to diagnose part faults, serial faults and after-junction faults because of weak echo signal and serious decay in the time domain reflection method. The time-frequency domain reflection method can diagnose faults more easily and improve the hit rates. In addition, the threshold de-noising method based on wavelet decomposition is utilized to eliminate the interference of noise and reduce the false alarm rates. The feasibility is verified and the comparison with time domain reflection method is processed by exporiments. The results show that the time-frequency domain reflection method is better than the time domain reflection method in the aspects of hit rates and false alarm rates.