基于ap-Welch的随机角振动信号的 频谱估计方法研究

在转台的随机角振动试验中,频谱估计的精度是一个非常重要的指标,直接影响到频谱复现的精度.在分析经典的频谱估计方法的基础上,提出了一种基于ap-Welch频谱估计(基于全相位预处理的Welch频谱估计)的方法,从理论上证明了其比Welch频谱估计法具有更强的旁瓣抑制作用.仿真实验结果表明,ap-Welch频谱估计法能够有效提高频谱估计的精度,而且随着全相位阶数的增加,频谱估计的收敛特性也随之改善.

Study on Spectrum Estimation Method of Rondom Angular Vibration Signal Based on ap-Welch

The precision of spectrum estimation is a very important index in random angular vibration test of turntable, which directly affects the spectrum reproduction. Based on the analysis of other classical methods of spectrum estimation, this paper proposes a method based on ap-Welch spectrum estimation (Welch spectrum estimation based on all-phase preprocessing), which proves theoretically that compare with Welch spectrum estimation method stronger side-lobe inhibition. Simulation results show that ap-Welch spectrum estimation method can effectively improve the accuracy of spectrum estimation, and the convergence property of spectrum estimation is improved with the increase of all-phase order