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广义Love波的频谱研究 总被引:5,自引:2,他引:5
本文分析了在三层弹性介质中,广义Love波的存在条件,研究了在不同材料组合情形下广义Love波的频率特性,并给出了其相速度随频率变化的计算曲线. 相似文献
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本文提出了裂纹在硬区的软对硬不均匀裂纹体的力学分析模型.疲劳实验研究表明,这种不均匀性影响疲劳裂纹扩展速率.文中的疲劳载荷下不均匀裂纹体的边界元数值计算结果表明,随着疲劳裂纹的扩展,在相同扩展步下,裂纹距软硬区界面越近,裂纹张开位移的幅值△COD 越小,J 积分幅值△J 亦越小.不均匀性对疲劳裂纹扩展速率的影响,主要通过影响△J 来实现.裂纹与软硬区界面的距离越近,疲劳裂纹扩展速率越小. 相似文献
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水平管中受压扭细长圆杆(管)的几何非线性弯曲 总被引:4,自引:0,他引:4
本文建立了水平管中受压扭细长圆杆(管)几何非线性弯曲的微分方程和边界条件,作为特例分析了无重受压扭圆杆(管)的螺旋弯曲。 相似文献
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Multidimensional modal analysis of liquid nonlinear sloshing in right circular cylindrical tank 总被引:1,自引:0,他引:1
The multidimensional modal theory proposed by Faltinsen,et al.(2000) is applied to solve liquid nonlinear free sloshing in right circular cylindrical tank for the first time. After selecting the leading modes and fixing the order of magnitudes baaed on the Narimanov-Moiseev third order asymptotic hypothesis,the general infinite dimensional modal system is reduced to a five dimensional asymptotic modal system (the system of second order nonlinear ordinary differential equations coupling the generalized time dependent coordinates of free surface wave elevation).The numerical integrations of this modal system discover most important nonlinear phenomena,which agree well with both pervious analytic theories and experimental observations. The results indicate that the multidimensional modal method is a very good tool for solving liquid nonlinear sloshing dynamics and will be developed to investigate more complex sloshing problem in our following work. 相似文献
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基于平板小挠度弯曲波动方程,采用摄动方法具有纵向内力作用下的平板开孔弹性波的散射问题进行了研究,得么了传播稳态波时此种平板弯曲波动问题的分析解,分析了均匀纵向内力对弹性波散射结果的影响,作为算例,本文给出了平板圆形开孔的动应力集中系数的数值结果,并对计算结果进行了讨论。 相似文献
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Stable response of low-gravity liquid non-linear sloshing in a circle cylindrical tank 总被引:1,自引:0,他引:1
Under pitch excitation,the sloshing of liquid in circular cylindrical tank includes planar motion,rotary motion and rotary motion inside planar motion.The boundaries between stable motion and unstable motion depend on the radius of the tank,the liquid height,the gravitational intension,the surface tensor and the sloshing damping.In this article,the differential equations of nonlinear sloshing are built first. And by variational principle,the Lagrange function of liquid pressure is constructed in volume intergration form.Then the velocity potential function is expanded in series by wave height function at the free surface.The nonlinear equations with kinematics and dynamics free surface boundary conditions through variation are derived.At last,these equations are solved by multiple-scales method.The influence of Bond number on the global stable response of nonlinear liquid sloshing in circular cylinder tank is analyzed in detail.The result indicates that variation of amplitude frequency response characteristics of the system with Bond,jump,lag and other nonlinear phenomena of liquid sloshing are investigated. 相似文献