The proposed finite difference boundary condition expands the scope of application of FDTD to scattering problems of objects with a finite acoustic impedance but without tangential stress.
导出了水中透声目标表面边界条件的时域有限差分(FDTD)表达形式，将FDTD在水声学中的应用范围扩大到无切应力的有限声阻抗目标的散射问题。
The cracking direction is determined by a simplified maximum tangential stress criterion.
开裂方向的计算采用了一种简化的最大切向应力准则。
Analyzed from the stress Angle, the lathe-bed is mainly imposed by a vertically upward force, moreover, the lathe-bed is not slender, so the direction of tangential stress should not be ignored.
从床身的受力角度看来，床身主要受到垂直方向上的力，而且床身不是细长的结构，切应力的方向不能忽略。
Analyzed from the stress Angle, the lathe-bed is mainly imposed by a vertically upward force, moreover, the lathe-bed is not slender, so the direction of tangential stress should not be ignored.
从床身的受力角度看来，床身主要受到垂直方向上的力，而且床身不是细长的结构，切应力的方向不能忽略。
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