微速差双转子系统不平衡信号提取方法

摘要

微速差双转子系统的两个频率相近不平衡信号形成拍振,传统不平衡信号提取方法的精度和快速性不佳.提出一种以数字带通滤波后数据为样本的改进型Prony方法用于识别两个转子的频率,可以有效解决微差双转子系统中转差不易测量的难题,把最小二乘方法用于识别已知频率的两个不平衡信号的幅值和相位,可以在噪声背景下快速、准确的实现参数估计.最后给出了详细的仿真结果和分析,证明了该方法的正确性.%Two unbalanced signals with adjacent frequencies form a beat signal in a dual-rotor system with slightly different rotating speeds.The precision and efficiency of the traditional extraction methods for unbalanced signals are not good.Here,an improved Prony method was presented to identify frequencies of two rotors based on bandpass filtered data,it could solve the problen that little rotating speed difference is not easy to be measured.The least square method was used to recognize amplitude and phase of a beat signal with known frequencies and to realize parametric estimations accurately and quickly.At last,simulations and analyses were given to prove the correctness of the proposed method.