Abstract：An improved peak search method used to extract the instantaneous frequency of the rotor is proposed, and this method is used for order tracking of rotating machinery. With the improved peak search method, the difference between the first derivative of the adjacent points in the instantaneous is considered as the condition to determine whether the search peak is reasonable, it avoids the false peaks that extracted with the traditional peak search method, and instantaneous frequency estimation accuracy is improved. Simulation results show that the improved peak search method can reduce the impact of the interference signals on the instantaneous frequency extraction, the effect is better than the traditional peak search method. With this method, vibration signal of rotor speed is analyzed, and good result is got.
2013, Vol. 32 
