本文根据机轮摆振的点接触理论，导出了为克服摆振所需线性阻尼的计算公式。
In this paper the formula of requisite linear damping for overcoming shimmy is derived according to the point contact theory of wheel shimmy.
在讨论输入和阻尼机理的基础上，提出了用振幅大小和起振门槛值作为衡量摆振大小和抗御摆振能力的衡量指标。
Based on the mechanism of input and damping, it is suggested that the vibration amplitude and threshold be taken as a criterion for evaluation vibration strength and anti-vibration ability.
分析了直升机从悬停到小速度前飞时，定常垂直气流的非均匀分布对直升机平衡操纵以及对系统摆振后退型模态阻尼的影响。
The influences of nonuniform vertical flow on helicopter trim controls and regressive lag modal damping levels were analyzed in hovering and forward flight.
利用正弦平方势，把粒子运动方程化为具有运动阻尼和周期调制的摆方程。
The equation of motion of particles has been reduced to the pendulum equation with a damping term and a forced term by using the sine_squared potential.
然而，液压减摆器的阻尼特性大都是非线性的。
However damping property of the hydraulic shimmy damper is mostly non-linear.
试验及分析表明，该车摆振主要为强迫振动，通过控制激振源、增大转向系统阻尼可抑制摆振。
The test and analysis show that the shimmy is a forced vibration and can be restrained by controlling excitation source and increasing steering system damping.
参照某型直升机旋翼系统对减摆阻尼器的结构及性能的要求，首次研制了一种金属橡胶-钢丝绳索型减摆器。
According to requirement of the shimmy damper's structure and performance of a kind of helicopter rotor system, the paper presents a new kind of metal rubber-steel cable shimmy damper firstly.
六年来，我们用无阻尼水平摆地倾仪，在1.7秒—5秒的周期范围内，在一系列的强震发生前，分别记录到了一种明显的波动异常。
Since 1976, by using the non—damping horizontal pendulum tiltmeter at the range of 1.7"—5" period. we have recorded one wave anomaly signal before a series of strong earthquakes respectively.
六年来，我们用无阻尼水平摆地倾仪，在1.7秒—5秒的周期范围内，在一系列的强震发生前，分别记录到了一种明显的波动异常。
Since 1976, by using the non—damping horizontal pendulum tiltmeter at the range of 1.7"—5" period. we have recorded one wave anomaly signal before a series of strong earthquakes respectively.
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