内爆炸振动测试对于评估密闭结构的安全具有重要意义,通过测量爆炸容器在內爆炸载荷下几个典型位置的振动情况,并利用小波技术提取振动信号不同频带下的振动分量,研究各频带振动分量的衰减规律,在此基础上,建立内爆炸振动信号多频带小波系数预测模型。结果表明,预测模型能反映出振动信号的强度和频谱以及随装药量和爆心距变化的规律,与实测信号相比,显示出较高的预测精度和较好的实用性。

The test and analysis of internal explosive vibration effects play an important part in the safety of equipment, construction and fortification with closed structure under internal blat loading. The experimental research was conducted to investigate the vibration dynamic response of cylindrical explosion vessel for intensive study of internal explosive seismic wave, and the vibrancy source model and the response model of closed structure were established. According to the time-frequency characteristic and multi-resolution decomposition of discrete wavelet transform, internal explosive vibration components with different frequency band were extracted. The attenuating law of each frequency band's internal explosive vibration component was studied, and a prediction model of the multi-band wavelet coefficients band Peak Particle Acceleration (PPA) was defined. The results indicate that this model can reflect the law that vibration intensity and frequency spectrum of blasting vibration signal changing with different dose and distance, and the model has higher precision and better practicability than experiment data.