【摘要】 在固体火箭发动机地面试验中,由于燃气喷流噪声的作用,使得测量得到的发动机壳体振动信号中包含有很强的噪声分量。通过对噪声信号与振动信号相关性的分析,确定了噪声对振动信号作用最强的频段,并结合小波分析,小波包分析理论,应用频带分离方法对振动信号进行去噪处理,取得良好效果。更多还原

【Abstract】 During solid rocket motor ground tests, because of action of jet noise, there are strong noise component in measured vibration signal. The correlativity between noise signal and vibration signal is analyzed in this paper. The strong frequency bands in which noise signal affect vibration signal are determined. Combination with wavelet analysis and waveletpacket analysis, the noise signal is extracted from vibration signal by using method of separating frequency band, and satisfied result is given.更多还原