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为解决传统STFT(Short Time Fourier Transform)方法因非同步采样引起频谱泄漏,造成频域曲线幅值降低,产生较大误差的问题,提出一种基于频域带通滤波的数据处理方法,通过在频域逐次移动带通滤波器的中心频率,获得信号中各个频率分量幅值的最大值。利用该方法对某载人航天器搭载的力学参数测量系统在整器正弦振动试验中采集的数据进行频谱分析,结果表明,该方法可有效获取力学参数测量系统各测点的频率幅值曲线,减少传统STFT方法产生的能量泄漏的影响。研究成果也可用于不依赖振动控制仪或无COLA通道的数据采集系统正弦振动试验的数据处理。
In order to solve the problem that traditional STFT (Short Time Fourier Transform) method causes spectrum leakage caused by non-synchronous sampling, resulting in a large error in the frequency domain curve amplitude reduction, a data processing method based on frequency-domain band-pass filtering is proposed. The frequency domain shifts the center frequency of the band-pass filter one by one to obtain the maximum value of the amplitude of each frequency component in the signal. The method is used to analyze the spectrum of the mechanical parameter measurement system of a manned spacecraft in the sinusoidal vibration test of the whole device. The results show that the method can effectively obtain the frequency amplitude curve of each measurement point of the mechanical parameter measurement system, Reduce the impact of energy leakage from traditional STFT methods. The results can also be used for data processing in sinusoidal vibration tests of data acquisition systems that do not rely on vibration controllers or COLA channels.