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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The motion pattern of a scanning point is studied in case a fixed laser beam is pointing at a rotating ball with fixed center.

研究了当用固定不动的激光束扫描球心固定的旋转球体时扫描点在球面上的移动模式。

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This Paper gives a method of drawing the influence line of fixed end beam and the influence area of fixed edge flat plate which are lying on the elastic foundation bed.

本文提出一种绘制支承于弹簧地基上固端梁影响线及四边固定板影响面的方法。

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