趋势项误差的低频极限特征理论模型与处理方法研究

To explain the reason of shock response spectrum distortion at low frequency, caused by the trend error in the shock signal, a low frequency trend error limit model was established. An exponential-based decay trend error correction method was designed, and the method was used in the ship underwater explosion shock signal which involved trend error. The results show that the method has a significant effect on the low frequency of the shock spectrum. The roll-off rate of the shock wave is improved by nearly 38 dB/oct during 0.1-10 Hz. The influence on the the middle and high frequency with small error is light. Therefore, the method can be used to correct the trend error of the underwater explosion shock acceleration signal.