非线性振动

Limit cycle flutter of a two-dimensional airfoil in cubic nonlinear aeroelastic system in incompressible flow is investigated.

引 言 在不可压缩流中的二元机翼是一个典型的自激振动的例子，在该系统中引入非线性项一般会产生如Hopf分岔，极限环颤振[1]，周期倍化及混沌等现象。

Then, a typical 5-degree-of-freedom system with cubically nonlinear stiffness was given to show the accuracy of the new method.

然后，以一个含有立方非线性的5自由度强迫振动系统为例阐明了新方法的有效性。

A new time-mode approach to nonlinear axisymmetric free vibrations of cylindrically orthotropic thin shallow spherical shell s is presented in this paper.

给出了一种研究圆柱正交异性扁薄球壳非线性轴对称自由振动的新的时间模态方法。

In this paper,using the improved L-P method and the interpolation perturbation method,the authors seek to solve a class of the damped strongly nonlinear free oscillation problems.

文摘：本文用插值摄动法及改进的L-P法相结合的方法求解了一类有阻尼的强非线性自由振动问题，得到了一级近似解。

It can be concluded that the feature of position curve of water in jig is the same as the curve of typical damped vibration. In the equations the motion parameters of water in jig, such as velocity, acceleration, force etc. are in a direct proportion to the air pressure, and have a definite non-linear relationship with jigging cycle, thickness, and mobility of jig bed.

结果表明，水流运动的位移曲线特性符合阻尼强迫振动规律，水流运动的位移、速度、加速度、受力、动能等运动参数与跳汰机风压有直接的线性关系，与跳汰周期、阻力、床层松散度等跳汰参数有明确的非线性关系。

Based on Crank-Nicoson's technique, and a new approach for the numerical simulation of the model is raised. The truncation error of the one step difference method reaches O (△t^2+△x^2) and of quite good stability condition.

基于Coriolis加速度和Lagrangian应力公式，利用Newton第二定律导出轴向加速度运动弦线横向振动的动力学模型；通过线性变换将方程化为一阶无量纲的非线性微分方程组；并利用Crank-Nicoson的中点离散技巧，给出运动方程的单步二阶差分方法；算法把对运动方程和本构方程分别离散，使之可以用于不同本构的运动弦线的数值仿真。

In chapter one, by using Krasnoselskii s fixed point theorem, necessary and sufficient c...

第一章讨论了一类带阻尼项的高阶非线性中立型差分方程正解的存在性，利用Krasnoselskii不动点定理，得到了非振动解存在的若干充分必要条件，这些结果改进和推广了一些已知的结果。

Some sufficient conditions for the forced oscillation of solutions of the systems are obtained.

研究具有连续分布滞量的非线性中立型双曲偏泛函微分方程系统，获得了该类系统解强迫振动的充分条件。

In order to discuss chaos motion, a kind of nonlinear dynamical free oscillation equation is solved.

为了讨论混沌运动，对一类非线性动力系统的自由振动方程进行了求解。

An accurate solution to the free oscillation equation of the shallow reticulated conical shell is obtained.

对于扁锥面网壳的非线性动力学的自由振动方程，给出了准确解。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。