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.
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. 5figs., 1 tab, 11refs.
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2007年第3期9-12,共4页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
贵州省科技攻关项目(黔科合GY字(2007)3015)
贵州省教育厅重点项目(2006203)
贵州省第六批优秀青年科技人才资助
教育部"春晖计划"资助
关键词
爆炸荷载
EMD
结构响应
频率
共振
blast load
EMD
structure response
frequency
resonance
