结合旋转机械启停阶段振动信号的特点,提出一种基于Viterbi算法的Gabor阶比跟踪(Gabor order tracking based on Viterbi,V_GOT)算法,此算法采用Viterbi算法代替了传统的Gabor阶比跟踪(Gabor order tracking,GOT)算法中的时频滤波技术。V_GOT算法和传统的GOT算法相比,其能够对复杂机械振动信号产生的邻近阶比和交叉阶比分量进行有效的跟踪和分离,并且具有计算量小、精度高、无需转速计等硬件和用纯软件的方法实现等优点。详细讨论了V_GOT技术的基本原理、算法及进行阶比跟踪的实现过程,另外,对偶函数对Gabor阶比跟踪结果的影响进行了深入的研究。采用仿真和实际试验对V_GOT算法进行了验证,试验结果表明该方法能够在时频域准确地提取幅值和复杂频率变化的阶比,适合于复杂旋转机械振动响应特征提取。
The study proposes an improved Gabor order tracking technique based on Viterbi algorithm (V_GOT) to cope with close orders and crossing orders that cannot be effectively separated by using the original Gabor order tracking (GOT) scheme. Time-frequency filter technique is replaced by the viterbi algorithm in the process of the V_GOT. In contrast with the original method of GOT, this technique has some advantages, for example, the use of tachometer and other special hardware are avoided in the method so the a...