通过分析拖拉机车身及其冲压成形的特点，结合柱面扁壳及球面扁壳件，建立一套扁壳类零件刚度的试验分析系统。
The system of stiffness test analysis is created by analyzing the shapes and forming processes of tractor body panels, of which based on cylindrical shallow shells and spherical shells.
最后由空间第一类机构与球面四杆机构的等效性，阐述了将此识别方法应用于第一组空间机构的方法。
Rotation angle symbol method to identify circuit and branch of spherical four bar is presented in this paper. Finally, the method about application to spatial first group mechanism is elaborated.
本文利用移动球面法证明了一类半线性椭圆型方程组正解的存在性与不存在性。
Existence and nonexistence of positive solutions for a class of semilinear elliptic systems are considered via the method of moving spheres.
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