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991.
992.
993.
Dynamic characteristic analysis of a 3-D semi-submerged body as a fluid-structure interaction system
An Arnoldi‘s method with new iteration pattern, which was designed for solving a large unsymmetric eigenvalue problem introduced by displacement-pressure FE (Finite Element) pattern of a fluid-structure interaction system, was adopted here to get the dynamic characteristics of the semi-submerged body. The new iteration pattern could be used efficiently to obtain the Arnoldi‘s vectors in the shift-frequency technique, which was used for the zero-frequency problem. Numerical example showed that the fluid-structure interaction is one of the important factors to the dynamic characteristics of large semi-submerged thin-walled structures. 相似文献
994.
空间几何构造分析的有限单元法 总被引:2,自引:0,他引:2
提出空间杆系几何构造分析的有限单元法,构造了两种单元(链杆单元和准梁单元)的几何约束矩阵,集成为整体矩阵并引入承条件后,通过对其阶数与秩的比较分析确定体系的几何可变性及静定性.本法原理简单,便于计算机实施,结果完备:对于几何不变体系,可指出多余约束的数目;对于几何可变体系,可给出体系的自由度数及相应的运动模态,并确定自由度的常变瞬变性质. 相似文献
995.
In this contribution, an inverse identification strategy of constitutive laws for elastoplastic behaviour is presented. The proposed inverse algorithm is composed on an appropriate finite element calculation combined with an optimisation procedure. It is applied to identify material anisotropic coefficients using a set up of easy performed laboratory tests. The used experimental data are the plane tensile test and the off axes tensile tests. The identified behaviour models are mainly based on Hill's quadratic yield criterion. Two cases of this yield criterion have been considered: the transverse isotropic and the orthotropic one under an associated and non-associated flow rule assumptions for each case. The yield surface has been assumed to expand isotropically (isotropic strain hardening law) as a function of the plastic work.In order to better describe anisotropic plastic properties of the studied materials, a recently planar anisotropic yield function is used. It is a non-quadratic yield criterion which takes account of anisotropic yield stresses as well as anisotropic strain ratios. It is subsequently shown that the agreement between inverse identification results and experimental measurements were improved.We prove also that the presented strategy is a good alternative to the simplified homogeneous tests assumption, especially for the plane tensile test. 相似文献
996.
997.
厚壁圆筒自紧问题的弹粘塑性有限元分析 总被引:1,自引:0,他引:1
在双剪应力强度理论的基础上,应用弹粘塑性模型求解厚壁圆筒自紧问题,算例表明,这一算法是可行有效的。 相似文献
998.
本文采用两套变量构造有限元试函数空间,在单元内部要求试函数精确满足平衡微分方程,在单元边界上对位移和转角分别用Peano升阶函数插值,然后利用广义变分原理建立了一种薄板弯曲问题的P型杂交解析有限方法,与常规有限元法相比,该方法不心进行过细的网格剖分,通过增加单元插值多项式的阶数P来提高精度,此外,该方法还具有积分计算只需在单元边界上进行、单元钢度矩阵和载荷向量具有嵌入结构、协调程度可以自动控制等优 相似文献
999.
A SINGULAR VALUE DECOMPOSITION BASED TRUNCATION ALGORITHM IN SOLVING THE STRUCTURAL DAMAGE EQUATIONS 总被引:1,自引:0,他引:1
RenWei-Xin 《Acta Mechanica Solida Sinica》2005,18(2):181-188
The structural damage identification through modal data often leads to solving a set of linear equations. Special numerical treatment is sometimes required for an accurate and stable solution owing to the ill conditioning of the equations. Based on the singular value decomposition (SVD) of the coefficient matrix, an error based truncation algorithm is proposed in this paper. By rejection of selected small singular values, the influence of noise can be reduced. A simply-supported beam is used as a simulation example to compare the results to other methods.Illustrative numerical examples demonstrate the good efficiency and stability of the algorithm in the nondestructive identification of structural damage through modal data. 相似文献
1000.
Yao Koutsawa El Mostafa Daya 《International Journal of Solids and Structures》2007,44(25-26):8735-8750
Static behavior and free vibration analysis of laminated glass beam on viscoelastic supports are performed. For the static case, an analytical way is developed for analyzing and optimization of laminated glass beam with general restraints at the boundaries. In the case of free linear vibrations, the modal properties of the glass are determined using a finite element method which is a powerful tool in the design of support damping treatment of a sandwich glass for passive vibration control. 相似文献