用于动平衡测试的MDAC窄带跟踪滤波器

为了从强干扰噪声中提取出与转速同频的振动分量,且适应转速波动时的情形,利用互相关原理导出了跟踪滤波方法,并采用乘法数模转换器(MDAC)设计并实现了窄带跟踪滤波器。实验结果表明,其增益相对误差优于0.2%,相位绝对误差优于0.4°,当转速变化率不超过9000r/min2时,滤波器的输出能够跟踪转速的变化。该滤波器能较好地满足动平衡测试的需要。

MDAC Narrowband Tracking Filter for Dynamic Balancing Measurement

In order to extract the vibration value which indicates the same frequency as rotating speed from the lower S/N ratio signal and adapts to speed variety, the method of Narrowband Tracking Filtering was deduced by the principle of correlation analysis. Based on this method a Narrowband Tracking Filter was designed and implemented by Multiplying Digital-to-Analog Converter (MDAC). The experimental results demonstrate that the filter has the good performance and is able to meet the requirements of dynamic balancing measurement, which the relative error of amplification is better than 0.2%, the absolute error of phase is better than 0.4° and its output can track the change of rotating speed when the variety ratio of speed is under 9000r/min².