For fixed damping and fixed excited frequency the motion of the beam under small amplitude of force is periodic, but becomes chaotic through period doubling bifurcation with increase of the force.

对固定的参数激励频率和阻尼，当参数激励幅值较小时梁的运动是周期的，但大幅值激励会使运动通过倍周期分岔变为混沌。

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In this paper, we study the periodic solutions of the impact oscillator with damping.

我们在这篇文章里主要对带阻尼的碰撞振子的周期解作研究。

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This paper is devoted to study the existence of an infinitude of periodic solutions for a class of second order linear PDE systems without damping.

本文首先给出了一类具有无穷多个周期解的无阻尼二阶线性偏微分方程所描述的系统。

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