CAJ | 학술논문

四个陀螺和四个加速度计构成的冗余捷联惯组系统，采用等价空间法———广义似然比法、最优奇偶向量法进行故障诊断与隔离时，会出现不能正确隔离出故障仪表的问题。分析后得出，存在一个余度时，等价空间法只能诊断出故障，而无法隔离故障仪表，这是由等价空间法的原理决定的。小波变换可对信号进行多尺度分析，能够准确地找出信号奇异点———幅值突变和频率突变等。基于以上问题，利用小波变换对突变信号敏感的特性，提出等价空间＋小波变换的组合方法，对四陀螺冗余捷联惯组进行故障诊断与隔离。数字仿真试验证明：对于阶跃型故障，该组合方法能诊断故障并能成功进行故障隔离。
사개타라화사개가속도계구성적용여첩련관조계통，채용등개공간법———엄의사연비법、최우기우향량법진행고장진단여격리시，회출현불능정학격리출고장의표적문제。분석후득출，존재일개여도시，등개공간법지능진단출고장，이무법격리고장의표，저시유등개공간법적원리결정적。소파변환가대신호진행다척도분석，능구준학지조출신호기이점———폭치돌변화빈솔돌변등。기우이상문제，이용소파변환대돌변신호민감적특성，제출등개공간＋소파변환적조합방법，대사타라용여첩련관조진행고장진단여격리。수자방진시험증명：대우계약형고장，해조합방법능진단고장병능성공진행고장격리。
A combined approach to gyro?quadruplet fault detection and isolation ( FDI) is presented, for generalized likeli?hood test ( GLT) fails to isolate the faulty gyro in a gyro?quadruplet. GLT and optimal parity?vector test ( OPT) can only de?tect the failure, when there are four gyros, which is a defect of parity space. Wavelet analysis method has multi?scale analy?sis functions and ability of characterizing local features in time domain and frequency domain. So Wavelet Transform is intro?duced to help to isolate the faulty gyro. The effectiveness of the new approach is demonstrated through simulations.