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I.IntroductionBoundaryelementmethod(BEM)hasbeenwidelyusedforlinearandnonlinearanalysisofengineeringstructures.ThetriditionalboundaryelementdiscretizationforthecouplingproblemoftbullditliollandpipeinFig.IisshowninFig.2.ConlparcdwithFEM,BEMIlasmoreadvantages.Inthispaper,thegeneralmethodoffindingthecomplexfundamentalsolutions(CFSs)I'orsemi-illfiniteplanealldintllliteplanewithholeundervariousboundaryconditions(aCs)hasbeenestablishedbyLlsillgRiemann-Schwarzsymmetricprincipleandsuperpositio… 相似文献
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尊敬的中国力学学会、周培源基金会的各位专家、各位领导、各位老师和同学: 首先,请允许我代表所有获奖单位,获奖个人以及所有参赛单位和个人,对这次力学竞赛取得圆满成功表示衷心的祝贺! 作为参赛单位之一,我们深感到力学竞赛的举行为提高全国大学生学习力学的兴趣,为发现人才,并促进基础力学教学改革和提高教学质量,起到了很大的作用. 正如钱令希院士等老一辈科学家在1999年6月的倡仪书中所言“普及是科学的力量所在,在某种意义上说,它是一切科学活动的目的和归宿,只有较充分地向公众宣传力学的贡献和作用,才能使公众… 相似文献
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半无限及含孔无限平面在各种边界条件下的复位势基本解* 总被引:3,自引:1,他引:2
运用Riemann-Schwarz对称原理和线弹性力学解的叠加原理建立了半无限平面及含孔无限平面在各种边界条件下基本解的一般求解方法,并分别导出边界上受不同荷载以及边界固定等各种边界条件下的复位势基本解。 相似文献
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The vibration and stability analysis of moderate thick plates by the method of lines 总被引:1,自引:0,他引:1
The method of lines based on Hu Hai-chang's theory for the vibration and stability of moderate thick plates is developed. The standard nonlinear ordinary differential equation (ODE) system for natural frequencies and critical load is given by use of ODE techniques, and then any indicated eigenvalue could be obtained directly from ODE solver by employing the so-called initial eigenfunction technique instead of the mode orthogonality condition.Numerical examples show that the present method is very effective and reliable. 相似文献
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本文在直接解析法的基础上,进一步提出结构损伤识别的非线性解析法.它与直接解析法不同之处是:考虑了频率和振型对损伤参数的二阶偏导数项,以此构造损伤参数为未知量的超定非线性方程组.求解该方程组可以一次性得到全部损伤参数值.本方法不仅具有直接解析法的优点,而且由于构建方程组时增加了损伤参数的二次项,极大地提高了损伤识别的精度.最后,通过对一个五层框架结构进行数值模拟分析验证了该方法的可行性,同时经过比较计算结果表明:在损伤识别中,非线性解析法在精度及节省计算工作量上明显优于直接解析法. 相似文献
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In this paper, the basic formulae for the semi-analytical graded FEM on FGM members are derived. Since FGM parameters vary along three space coordinates, the parameters can be integrated in mechanical equations. Therefore with the parameters of a given FGM plate, problems of FGM plate under various conditions can be solved. The approach uses 1D discretization to obtain 3D solutions, which is proven to be an effective numerical method for the mechanical analyses of FGM structures. Examples of FGM plates with complex shapes and various holes are presented. 相似文献