Based on the principle of virtual work,the one-way recursive method for construction has been presented here. This method has high efficiency in formulation and the analogy in solving the equations of different problems makes it easier to organize the program.
基于虚功原理提出多体系统的单向递推组集方法，该方法建模效率高，对不同类型的问题方程具有很高的相似性，便于编程。
参考来源 - 多体系统动力学方程计算机自动组集求解·2,447,543篇论文数据，部分数据来源于NoteExpress
再串行组集界面刚度和质量阵，并求解缩减后的整体方程。
Then the interface stiffness matrices and the mass matrices are assembled serially and the final reduced equations are solved.
再串行组集和求解界面方程得界面位移，最后返回各个子区，并行求解内点应力和位移。
By serially assembling and solving global equation to get interface displacements and backing to every sub-region, the inter-nodal displacements and element stresses can be solved.
对于单一分组集或多个分组集，分组列的次序是无所谓的；但是对于ROLLUP，列的次序不能随意安排。
While the ordering of the grouping columns does not matter for a single grouping set or multiple grouping sets, the order of the columns does matter for ROLLUP.
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