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1引言随着国民经济的快速发展,作为新型的、具有特殊功能的高分子聚合物已成为在国民经济各部门中应用最为广泛的新型材料之一,如SAN、PP、PVC等高聚物.高聚物状态方程是研究这类新型材料性能及其加工过程,以及生产这些高聚物机械设备设计的重要依据,长期以来一直为广大高分子科技工作者十分重视的研究领域。但由于高聚物具有其特殊且又十分复杂的物质结构,与常规的气、液等物态有着很大的差异,尤其热物性与这些常规物质间存在着很大的不同,因此研究起来往往十分困难,至今为止国外的研究仍寥寥无几,国内在这方面的研究几乎尚… 相似文献
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叙述了RBF神经网络的结构和“薄管板”结构强度分析过程以及应用RBF神经网络对“薄管板”结构应力的非线性系统进行了系统辩识 ,网络输出值与计算值符合较好。说明基于神经网络的系统辩识方法在结构强度分析过程中具有一定的实用性。 相似文献
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IntroductionSincefiniteelementanalysisprogramsdealwiththetheoriesandmethodsofthreefieldsofmechanics,appliedmathematicsandcomputerscience,theyarecomplicatedanderror_prone .Duringdevelopmentpeopleallthroughseekthemethodtoimproveprograms.Theobject_oriente… 相似文献
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The improved element-free Galerkin(IEFG) method of elasticity is used to solve the topology optimization problems.In this method, the improved moving least-squares approximation is used to form the shape function. In a topology optimization process, the entire structure volume is considered as the constraint. From the solid isotropic microstructures with penalization, we select relative node density as a design variable. Then we choose the minimization of compliance to be an objective function, and compute its sensitivity with the adjoint method. The IEFG method in this paper can overcome the disadvantages of the singular matrices that sometimes appear in conventional element-free Galerkin(EFG) method. The central processing unit(CPU) time of each example is given to show that the IEFG method is more efficient than the EFG method under the same precision, and the advantage that the IEFG method does not form singular matrices is also shown. 相似文献
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A hybrid natural element method(HNEM)for two-dimensional viscoelasticity problems under the creep condition is proposed.The natural neighbor interpolation is used as the test function,and the discrete equation system of the HNEM for viscoelasticity problems is obtained using the Hellinger–Reissner variational principle.In contrast to the natural element method(NEM),the HNEM can directly obtain the nodal stresses,which have higher precisions than those obtained using the moving least-square(MLS)approximation.Some numerical examples are given to demonstrate the validity and superiority of this HNEM. 相似文献
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面向对象有限元分析程序设计及其VC++实现 总被引:2,自引:0,他引:2
采用面向对象的方法确定了有限元分析过程的对象、对象间的关系及类库,并使用VC++语言,利用其MFC类库实现了有限元分析类库及相应窗口图形化界面的程序体序。程序系统具有良好的可靠性,可再用性和可扩充性。为进一步开发大型、通用、功能性强的面向对象的有限元分析软件提供参考。 相似文献