一种改进的窄带Fx-Newton算法及在振动主动控制中的应用

摘要

窄带Fx-Newton算法应用在振动主动控制中具有收敛速度快、收敛效果好等优点,其中窄带滤波器在算法的信号通道和更新通道中能有效的提高待处理信号的信噪比,增强信号的相关性.针对多频带窄带算法在实际应用过程中不可避免出现的频带间过度问题,提出一种改进的窄带Fx-Newton算法,通过设计一组跨频带的窄带滤波器组,增加窄带滤波器的个数、改变窄带滤波器的分布,使得算法对于频带间的线谱控制能力得到提高.算法进行了仿真分析和试验对比,结果表明改进后的算法提高了线谱处于频带边缘时的收敛速度,提高了算法的稳定性和可靠性,对窄带Fx-Newton算法在振动主动控制中的应用具有重要意义.%The narrowband Fx-Newton algorithm has the advantage of fast convergence speed and good performance.The narrowband filter in the algorithm improves the signal to noise ratio of measured signals and confirms the advantage.In the paper,the narrowband filters in the Fx-Newton algorithm were improved aiming at dealing with the spectrum between the edges of divided frequency bands by designing a cross-band filter bank to increase the number of filters and change the distribution of narrowband filters in the algorithm.The improved algorithm was tested and the results show that it increases the convergence speed when the spectrum is between the edges of divided frequency bands and improves the algorithm's steadiness and reliability.It is meaningful for the application of Fx-Newton algorithm in active vibration controls.