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过去在大电机水轮机设计中,基本上按材料力学,弹性理论来分析结构部件内部的变形和应力状态。这种方法的缺点是适用范围狭窄,只能用于求解一些轮廓形状和边界条件简单的结构,如规律荷载条件作用下的矩形、圆形等结构件。至于实际工程问题中提出的大量复杂课题,则已超出这一方法的解题能力范围,只能近似求解。在一段时间内,有限差分法曾
In the past in large motor turbine design, basically according to the material mechanics and elasticity theory to analyze the structural parts of the internal deformation and stress state. The disadvantage of this method is its narrow application range, which can only be used to solve some simple structures with contour shapes and boundary conditions, such as rectangular and circular structures under regular load conditions. As for the large number of complex topics raised in the actual engineering problems, the scope of the problem solving ability of this method has been exceeded and can only be solved approximately. In a period of time, the finite difference method used to be