利用三维变分差分方法研究薄壳的动力分析。
The three dimensional variational difference method was applied to dynamic analysis of thin shells.
研究了双多基地多普勒雷达资料的配对方法、风场反演的区域和精度，并研制了基于三维变分方法的双多基地多普勒雷达系统的风场反演系统。
The data processing and variational algorithm for 3-D wind field retrieval by bistatic Doppler radar network are developed and bias of retrieved wind is analyzed.
介绍了三维接触问题的变分原理，推导了接触问题有限元计算公式，讨论了边界接触模式和接触条件。
The variation principle of the 3-D contact problem is introduced, the related formulas based on the finite element method are derived, and the contact mode and condition of the boundary are discussed.
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