【摘要】 通过经验模态分解法(EMD)将信号分解为固有模态函数(IMF),结果表明震动信号是由不同频率的具有实际物理意义的固有模态函数分量组成.同时建立了爆炸荷载下的单自由度体系结构动态响应模型,并运用实例分析了结构在爆破震动下的动力放大效应.分析表明不同的IMF分量对结构的影响各不相同,两者频率越接近,其共振作用就越明显.结构对荷载的响应主要取决于不同幅值、不同频率的各IMF分量的共同作用.更多还原

【Abstract】 Signal was decomposed into Intrinsic Mode Function(IMF) by Empirical Mode Decomposition(EMD) method, it is found that the vibration signal is composed by IMFs with different frequency and practical physical meanings. In addition, the model of structure dynamic response to blasting load with single degree of freedom system was established, and dynamical ampliation of structure response to blasting vibration was analyzed with example. It is indicated that influence upon structure from different IMF is unlike, the both frequency nearer, the resonance action more evident, and the structure response to load is mainly lied on co-action of each IMF with different swing and frequency.更多还原