从多维地震动输入下的结构三维振动方程出发，给出了结构多维随机振动的振型位移法和振型加速度法。
From the equation of three-dimensional vibration of structures, the methods of multi-dimensional random mode displacement and mode acceleration have been put forward.
本文介绍了应用三维地震及电磁法探测采空区边界及含水性的技术方法与地质效果。
The method for the exploration of the mined-out areas by using 3D seismic and electromagnetic laws and its effect are introduced.
研究对比了各结构体系的动力特性，并通过地震弹性时程反应分析法进行了结构体系三维地震反应分析与对比。
The dynamical characteristics contrastive analysis is made, and 3d seismic response contrastive analysis through the method of elastic time-history response of systems is also made.
研究对比了各结构体系的动力特性，并通过地震弹性时程反应分析法进行了结构体系三维地震反应分析与对比。
The dynamical characteristics contrastive analysis is made, and 3d seismic response contrastive analysis through the method of elastic time-history response of systems is also made.
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