【摘要】 针对振动试验控制领域低频控制精度不足的难题,提出基于多抽样率理论的多分辨谱分析方法,利用数字信号处理的抽取与插值滤波原理,实现整个频带范围内变分辨率的谱估计,保证了在低频段具有更高的频率分辨率。经过仿真与试验研究,该方法成功解决了振动试验低频时试验信号幅值分离精度不高及低频时多个相邻试验信号分量无法分离的难题,从试验结果分析中,可得出该方法不仅能提高振动试验低频控制精度,而且能改善高频控制精度,从而验证了该方法的可行性与正确性。更多还原

【Abstract】 Aiming at the problem of low control precision at low frequencies in vibration tests,a new algorithm for multi-resolution spectrum estimation based on multi-samping rate theory was put forward.Making use of the decimation and interposition filter theory in digital signal processing,integrating the single-resolution spectrum,different rate spectrum estimation in whole frequency band was achieved and high resolution can be ensured at low frequencies.By simulation and experiment,the control method was proved to be successful in solving the problem of amplitude separating precision in vibration signal as well as the difficulty to separate the adjacent vibration components at low frequencies.The results show that the method can not only increase control accuracy at low frequencies,but also improve control accuracy at high frequencies.Good test results verify the feasibility and correctness of the method proposed.更多还原