首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   7篇
  完全免费   4篇
  力学   11篇
  2007年   2篇
  2005年   2篇
  2004年   1篇
  2003年   4篇
  1999年   2篇
排序方式: 共有11条查询结果,搜索用时 15 毫秒
1.
波纹壳的摄动解法   总被引:16,自引:2,他引:14  
袁鸿 《应用力学学报》1999,16(1):144-148
应用扁锥壳的非线性大挠度理论,研究了在均布载荷和中心集中载荷下,具有光滑中心的锯齿形和梯形波纹壳,采用摄动法和幂级数方法,得到了波纹壳的弹性特征。本文的解答符合实验结果。  相似文献
2.
Winkler地基上薄板问题的准格林函数方法   总被引:11,自引:0,他引:11  
袁鸿 《计算力学学报》1999,16(4):478-482
将准格林函数方法应用到Winkler地基上的薄板理论中,得到了一个第二类Fredholm积分方程。通过边界方程的适当选择,积分方程 奇异性被克服了。算例表明,本文采用的方法具有较高的精度。  相似文献
3.
均布载荷作用下带边缘大波纹膜片的非线性弯曲   总被引:6,自引:0,他引:6  
袁鸿  刘人怀 《力学学报》2003,35(1):14-20
采用轴对称旋转壳体的简化Reissner方程,研究了在均布载荷作用下具有硬中心的带边缘大波纹膜片的非线性弯曲问题.应用积分方程方法,获得了具有夹紧固定和滑动固定两种外边界的膜片的特征关系,即荷载-中心挠度曲线.作为算例,给出了夹紧固定膜片中的应力分布.  相似文献
4.
集中载荷作用下具有光滑中心波纹膜片的非线性分析   总被引:4,自引:0,他引:4  
袁鸿  张湘伟 《上海力学》2003,24(1):124-128
波纹膜片是一种薄壳弹性体,由于它的参数很多,又相互制约,所以使得它的设计很复杂。在大多数位移式仪器仪表中,要求波纹膜片产生至少和膜片厚度是同样数量级的弹性位移。这就要求使用薄壳的几何非线性理论进行分析。大多数学者研究波纹膜片的弯曲问题,是采用扁壳理论讨论具有浅波纹的膜片。而工程实际中,经常遇到深波纹膜片,这就要求从一般壳体大挠度方程进行求解。本文采用轴对称旋转壳体的简化Re-issner方程。研究了在中心集中载荷作用下具有光滑中心波纹膜片的非线性弯曲问题。应用积分方程方法,可以获得膜片的特征关系(载荷-中心挠度关系)和应力分布。文末给出实例计算的数值结果。  相似文献
5.
复合载荷作用下具有光滑中心波纹膜片的非线性分析   总被引:2,自引:0,他引:2  
采用轴对称旋转壳体的简化Reissner方程,研究了在复合载荷作用下具有光滑中心波纹膜片的非线性弯曲问题。应用积分方程方法,可以获得膜片的特征关系(载荷-中心挠度关系)。文末给出了实例计算的数值结果。  相似文献
6.
METHOD OF GREEN'S FUNCTION OF CORRUGATED SHELLS   总被引:1,自引:1,他引:0       下载免费PDF全文
By using the fundamental equations of axisymmetric shallow shells of revolution, the nonlinear bending of a shallow corrugated shell with taper under arbitrary load has been investigated. The nonlinear boundary value problem of the corrugated shell was reduced to the nonlinear integral equations by using the method of Green's function. To solve the integral equations, expansion method was used to obtain Green's function. Then the integral equations were reduced to the form with degenerate core by expanding Green's function as series of characteristic function. Therefore, the integral equations become nonlinear algebraic equations. Newton' s iterative method was utilized to solve the nonlinear algebraic equations. To guarantee the convergence of the iterative method, deflection at center was taken as control parameter. Corresponding loads were obtained by increasing deflection one by one. As a numerical example,elastic characteristic of shallow corrugated shells with spherical taper was studied.Calculation results show that characteristic of corrugated shells changes remarkably. The snapping instability which is analogous to shallow spherical shells occurs with increasing load if the taper is relatively large. The solution is close to the experimental results.  相似文献
7.
IntroductionCorrugateddiaphragmisatypeofelasticthinshells .Itsdesignisverycomplicatedbecauseoftoomanyparametersthatinfluenceeachother.Inanumberofinstrumentsmeasuringdisplacements,corrugateddiaphragmissubjectedtoelasticdisplacementthatisatleastthesameorderasitsthickness,sothatitisnecessarytousegeometricalnonlineartheoryofthinshellstoanalyze.Sofarasweknow ,inmostcases,investigatorsdiscussedonlytheproblemofcorrugateddiaphragmwithuniformanddensecorrugationsundertheactionofaunique(uniformlyorconcen…  相似文献
8.
Introduction Corrugateddiaphragmiswidelyusedaselasticmeasurementelementinprecision instruments.Sometimes,corrugateddiaphragmismanufacturedwithconicorsphericaltaper toadjustthecharacteristicofdiaphragm.Forexample,theshapetaperisoftenusedtoincreasesensitivityofdiaphragmindesignofvacuumdiaphragmforheightmeter.Inmanyengineeringpracticalproblems,controlequationscanbedescribedbyeither differentialequationsorintegralequations.Usually,differentialincreaseserrorandintegral decreaseserrorinnumericalana…  相似文献
9.
采用轴对称旋转壳体的简化Reissner方程,研究了在均布载荷作用下具有光滑中心波纹膜片的非线性弯曲问题。应用格林函数方法,波纹膜片的非线性边值问题化为了非线性积分方程的求解。为了求解积分方程并防止发散,一个插值参数被引入到迭代格式中。计算表明,当载荷很小时,任何插值参数值均能保证迭代的收敛性,取插值参数值接近或等于1获得较快的收敛速度,而当载荷较大时,插值参数值不能取得过大。绘出了波纹膜片的特征曲线,得到的特征曲线可供设计参考。可以断言,当载荷不大时,特征曲线是近似线性的,随着载荷的增大,特征曲线开始向上弯曲,明显偏离线性。本文中提出的解决方法适应于任意轴向截面的波纹壳体。  相似文献
10.
Based on the large deflection dynamic equations of axisymmetric shallow shells of revolution, the nonlinear forced vibration of a corrugated shallow shell under uniform load is investigated. The nonlinear partial differential equations of shallow shell are reduced to the nonlinear integral-differential equations by the method of Green's function. To solve the integral-differential equations, expansion method is used to obtain Green's function. Then the integral-differential equations are reduced to the form with degenerate core by expanding Green's function as series of characteristic function. Therefore, the integral-differential equations become nonlinear ordinary differential equations with regard to time. The amplitude-frequency response under harmonic force is obtained by considering single mode vibration. As a numerical example, forced vibration phenomena of shallow spherical shells with sinusoidal corrugation are studied. The obtained solutions are available for reference to design of corrugated shells  相似文献
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号