随着保护区逐渐增大，系统函数的不连续边界出现，而且系统在此边界处的能量跳跃也逐渐增大。

As it gradually increases, the discontinuous border of the system function appears, and the jump of the system energy at it also becomes bigger.

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本文利用可视原则对不连续介质边界条件等效处理，通过一种更简便的拉格朗日法施加不连续边界以及本质边界条件。

This paper treated discontinuous medium boundary condition by using visual principle and through a more convenient method of Lagrange multipliers method.

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一般常用薄板单元分析薄壳内力，但由于内部边界联接斜率的不连续性而影响到求解精度。

Generally, the internal forces of shells are analysed by the plate elements, but because of the slope discontinuity of internal boundaries, it always influences the accuracy of the solution.

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