Since the damping matrix in the motion equation of damped blade is no longer decoupled as Rayleigh damping, so the complex mode theory is introduced in this paper to overcome the difficulty.

由于带阻尼围带或凸肩叶片(以下简称阻尼叶片)的运动方程中的阻尼矩阵是非解耦的矩阵，只有引入复模态理论才能圆满解决其特征问题的求解。

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A mathematic model of the linear damped oscillation of swing with parameter exciting is presented. The theoretical analysis and numerical simulation for the motion behavior of swing is done.

建立了具有线性阻尼的秋千参激振动的数学模型，并对秋千的运动行为作了理论分析与数值模拟。

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The logarithmic spiral method is a good way of describing damped harmonic motion.

对数螺线方法是描述阻尼谐振动的一个好方法。

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