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1.
弹性厚矩形板受迫振动的功的互等定理法   总被引:1,自引:0,他引:1  
本文将功的互等定理法(RTM)推广应用于求解基于Reissner理论的厚矩形板受迫振动问题·本文导出了厚矩形板动力基本解;给出了三边固定一边自由厚矩形板在均布简谐干挠力作用下稳态响应的精确解析解·这是计算厚矩形板受振动稳态响应的一个简便通用的方法·  相似文献   

2.
弹性地基上矩形板弯曲的CC型级数解   总被引:7,自引:0,他引:7  
本文利用双变量函数的Stockes变换,用CC型级数求弹性地基上矩形板弯曲问题的解析解。以弹性地基上四边自由矩形板中点作用一集中力为例给出数字计算结果。  相似文献   

3.
本文应用广义函数的Fourier积分变换,导出了双参数地基上Reissner板弯曲问题的两个基本解·在此基础上,从虚功原理出发,依据胡海昌导出的Reissner板弯曲理论,推导出适用于任意形状、任意荷载、任意边界条件情形的三个边界积分方程,为边界元法在这一问题中的应用提供了理论基础·文中给出了固支、简支、自由三类边界的算例,并与解析解比较,均得到满意的结果·  相似文献   

4.
双参数地基上Reissner板弯曲问题的边界积分方程   总被引:1,自引:0,他引:1  
本应用广义函数的Fourier积分变换,导出了双参数地基上Reissner板弯曲问题的两个基本解。在此基础上,从虚功原理出发,依据胡海昌导出的Reissner板弯曲理论,推导出适用于任意形状,任意荷载,任意边界条件情形的三个边界积分方程,为边界元法在这一问题中的应用提供了理论基础。中给出了固支、简支、自由三类边界的算例,并与解析解比较,均得到满意的结果。  相似文献   

5.
本文由设定两个位移函数,应用最小二乘法和能量法,得到中厚悬臂矩形板固有振动和稳定的Reissner近似解。  相似文献   

6.
弯曲厚矩形板精确角点静力条件的推导   总被引:2,自引:0,他引:2  
本文根据最小势能原理 ̄[1]严格地导出弯曲厚矩形板精确的角点静力条件.  相似文献   

7.
考虑横向剪切效应的悬臂矩形板的弯曲   总被引:8,自引:0,他引:8  
本文以Reissner板理论为基础,利用厚板的广义简支边概念及迭加法,求得了考虑横向剪切效应的悬臂矩形板弯曲的精确解.从所得结果来看,这种方法是有效的.  相似文献   

8.
矩形中厚板和夹层板的后屈曲   总被引:2,自引:2,他引:0  
本文研究了矩形Reissner中厚板和夹层板的后屈曲特性。首先将矩形中厚板和夹层板的基本方程和边界条件表述成统一的无量纲形式。对不同的边界条件,特别是不对称边界条件,文中发展了一种应用于非线性分析的混合Fourier级数求解新方法,获得了级数形式的精确解。非线性偏微分方程化为无穷元非线性代数方程组,数值计算中截取有限项进行迭代求解。  相似文献   

9.
本文给出了两对边简支另两对边任意支承的中间有任意多个单向弹性线支矩形板横向振动的一个新的解析解法、将弹性线支反力看作是作用于板上的待求外力,求得了含有来知的弹性线支反力的两对边简支矩形板的运动方程的解析解;利用弹性线支反力与板横向位移之间的线性关系导出频率方程;频率方程及振型函数的表述均与已有方法不同.  相似文献   

10.
三边夹紧一边自由的矩形厚板的弯曲   总被引:5,自引:2,他引:3  
利用厚板的Reissner理论中的广义简支边概念得到了三边夹紧一边自由受均布横向载荷作用的矩形厚板的精确解.研究和考察了板的厚度对弯曲的影响及薄板弯曲的Kirchhoff理论的适用范围.  相似文献   

11.
应用功的互等定理,求解了悬臂厚矩形板在集中载荷作用下的挠曲面方程;同时也通过编程计算给出了具有实际价值的计算结果,进一步证明了应用功的互等法求解厚矩形板的正确性和优越性.  相似文献   

12.
悬臂矩形板的弯曲问题一直是平板经典理论中的著名难题,利用中厚板虚拟功的互等定理,借助付宝连提出的角点静力边界条件,得到了均布载荷作用下悬臂厚矩形板弯曲的封闭解析解,并采用现代数值方法和计算软件对所得解析解进行了数值计算.结果表明功的互等法是求解中厚板弯曲问题的一个简明有效的方法.  相似文献   

13.
In this study, the bending solution of simply supported transversely isotropic thick rectangular plates with thickness variations is provided using displacement potential functions. To achieve this purpose, governing partial differential equations in terms of displacements are obtained as the quadratic and fourth order. Then, the governing equations are solved using the separation of variables method satisfying exact boundary conditions. The advantage of the purposed method is that there is no limitation on the thickness of the plate or the way the plate thickness is being varied. No simplifying assumption in the analysis process leads to the applicability and reliability of the present method to plates with any arbitrarily chosen thickness. In order to confirm the accuracy of the proposed solution, the obtained results are compared with existing published analytical works for thin variable thickness and thick constant thickness plate. Also, due to the lack of analytical research on thick plates with variable thickness, the obtained results are verified using the finite element method which shows excellent agreement. The results show that the maximum displacement of the plates with variable thickness is moved from the center toward the thinner plate edge. In addition, results exhibit the profound effects of both thickness and aspect ratio on stress distribution along the thickness of the plate. Results also show that varying thickness has not a profound impact on bending and twisting moments in transversely isotropic plates. Five different materials consist of four transversely isotropic and one isotropic, as a special case, are considered in this paper, which it is shown that the material properties have a more considerable impact on higher thickness plate.  相似文献   

14.
The symplectic geometry approach is introduced for accurate bending analysis of rectangular thin plates with two adjacent edges free and the others clamped or simply supported. The basic equations for rectangular plates are first transferred into Hamilton canonical equations. Using the symplectic approach, the analytic solution of rectangular thin plate with two adjacent edges simply supported and the others slidingly supported is derived. Accurate bending solutions of title problems are then obtained using the superposition method. The approach used in this paper eliminates the need to pre-determine the deformation function and is hence more reasonable than conventional methods. Numerical results are presented to demonstrate the validity and efficiency of the approach as compared with those reported in other literatures.  相似文献   

15.
本文在von Krmn型板理论的基础上,采用双重Fourier级数方法,研究了对称正交层合矩形板在简支边条件下,承受任意分布横向载荷和面内载荷联合作用的非线性弯曲问题,得到了满足控制方程和边界条件的解.  相似文献   

16.
Recently, the present authors proposed a simple mixed Ritz-differential quadrature (DQ) methodology for free and forced vibration, and buckling analysis of rectangular plates. In this technique, the Ritz method is first used to discretize the spatial partial derivatives with respect to a coordinate direction of the plate. The DQ method is then employed to analogize the resulting system of ordinary or partial differential equations. The mixed method was shown to work well for vibration and buckling problems of rectangular plates with simple boundary conditions. But, due to the use of conventional Ritz method in one coordinate direction of the plate, the geometric boundary conditions of the problem can only be satisfied in that direction. Therefore, the conventional mixed Ritz-DQ methodology may encounter difficulties when dealing with rectangular plates involving adjacent free edges and skew plates. To overcome this difficulty, this paper presents a modified mixed Ritz-DQ formulation in which all the natural boundary conditions are exactly implemented. The versatility, accuracy and efficiency of the proposed method for free vibration analysis of thick rectangular and skew plates are tested against other solution procedures. It is revealed that the proposed method can produce highly accurate solutions for the natural frequencies of thick rectangular plates involving adjacent free edges and skew plates using a small number Ritz terms and DQ sampling points.  相似文献   

17.
It is of significance to explore benchmark analytic free vibration solutions of rectangular thick plates without two parallel simply supported edges, because the classic analytic methods are usually invalid for the problems of this category. The main challenge is to find the solutions meeting both the governing higher order partial differential equations (PDEs) and boundary conditions of the plates, i.e., to analytically solve associated complex boundary value problems of PDEs. In this letter, we extend a novel symplectic superposition method to the free vibration problems of clamped rectangular thick plates, with the analytic frequency solutions obtained by a brief set of equations. It is found that the analytic solutions of clamped plates can simply reduce to their variants with any combinations of clamped and simply supported edges via an easy relaxation of boundary conditions. The new results yielded in this letter are not only useful for rapid design of thick plate structures but also provide reliable benchmarks for checking the validity of other new solution methods.  相似文献   

18.
In this paper, the analytical bending solutions of clamped rectangular thin plates resting on elastic foundations are obtained by a rational symplectic superposition method which is based on the Hamiltonian system. The proposed method is capable of solving the plate problems with different boundary conditions via a step-by-step derivation without any trial solutions. The presented solution procedure can be extended to more boundary value problems in engineering.  相似文献   

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