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李逸豪徐典陈一鸣安东琦李锐 《应用数学和力学》2023,(9):1112-1121
Analytical solutions, with unique research value, can serve as benchmarks for empirical formulas and numerical methods, a tool for rapid parameter analysis and optimization, and a theoretical basis for experimental designs. Conventional analytical methods, e.g., the Lévy solution method, are only applicable to mechanical problems of plates and shells with opposite simply-supported edges, which, however, may fail to obtain analytical solutions for the issues with complex boundary constraints. In recent years, the finite integral transform method for plate and shell problems was developed to deal with non-Lévy-type plates and shells, but it is still infeasible to solve the mixed boundary constrains-induced complex boundary value problems of higher-order partial differential equations. Herein, for the first time, the finite integral transform method was combined with the sub-domain decomposition technique to solve the free vibrations of rectangular thin plates with mixed boundary constraints. The rectangular plate was first divided into 2 sub-domains according to the mixed boundary constraints, and the 2 sub-domains were solved analytically with the finite integral transform method. Finally, the continuity conditions were introduced to obtain the analytical solution of the original problem. Based on the side spot-welded cantilever plates commonly used in engineering, the free vibration problem of a rectangular thin plate with 1 edge subjected to clamped-simply supported constraints and the other 3 edges free, was analyzed. The obtained natural frequencies and mode shapes are in good agreement with those from the finite element method as well as the solutions in literature, thus verifying the accuracy of the proposed method. The solution procedure of the finite integral transform method can be implemented based on the governing equations without any assumption of the solution form. Therefore, this strict analytical method is widely applicable to complex boundary value problems of higher-order partial differential equations for such mechanical problems of plates and shells. © 2023 Editorial Office of Applied Mathematics and Mechanics. All rights reserved. 相似文献
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用分离解法求解弹性接触问题时,在增量加载和迭代过程中,由于接触区某些节点的状态发生改变而导致方程组的系数矩阵某些行和列元素随之变化。根据此特点,本推导了一种新的自适应迭代算法-快速凝缩消元法,并给出具体的迭代步骤,避免了系数矩阵变化时必须重新形成矩阵的重复计算。 相似文献
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Legendre小波求解超奇异积分 总被引:1,自引:1,他引:0
超奇异积分的数值算法一直是近些年来研究的重要课题. 基于超奇异积分的 Hadamard 有限部分积分定义, 本文给出了利用 Legendre 小波计算超奇异积分的方法. 当奇异点位于区间内时, 由于 Legendre 小波具有很好的正交性、显式表达式以及小波函数的可计算性, 将区间内的奇异点变换到区间端点处, 再利用区间端点处 Hadamard 有限部分积分的定义,进而可以计算 p+1(p∈N+) 阶超奇异积分. 文中最后给出的算例表明了该方法的可行性和有效性. 相似文献
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1 动手实验———物理创造思维发展的摇篮李政道博士在对中国科技大学少年班的一次讲演中说 ,美国的孩子从小就有动手做各种用具、家具的习惯 ,动手已成为不可缺少的内容 . 1 8世纪前 ,许多发明创造都是中国人搞的 ,因此不会动手决不是中国人的传统 .现在的学生不重视动手 ,这 相似文献
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接触问题是固体力学领域的一个重要问题.也是工程实际中经常遇到的问题之一,而解决接触问题有多种方法.本文给出一个带摩擦的Signorini边值问题及其等价的变分不等式,并证明它们的等价性,从而可以把带摩擦的接触问题的偏微分方程通过相应变分不等式加以解决。 相似文献
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