基于改进峰值搜索法的旋转机械瞬时频率估计

提出了一种用于提取转子瞬时频率的改进峰值搜索法，并将该方法应用于旋转机械阶比跟踪。改进的峰值搜索法将瞬时频率中相邻两点一阶导数的差值作为搜索峰值是否合理的判别条件，避免了传统峰值搜索法在干扰信号作用下提取到的虚假峰值，提高了瞬时频率的估计精度。仿真实验表明，改进的峰值搜索法能够降低干扰信号对瞬时频率提取的影响，效果优于传统的峰值搜索法。用该方法对实测转子升速振动信号进行阶比分析，取得了良好的效果。

Instantaneous Frequency Estimation of Rotating Machinery Based on Improved Peak Search Method

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.