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提出了直升机空间机动飞行及尾传动轴运动位姿的一种描述方法,建立了相关坐标系。基于扩展哈密顿原理,建立了直升机空间机动飞行下尾斜轴横向弯曲振动的动力学模型,并利用伽辽金法将偏微分方程转化为常微分方程。水平传动轴可以当作尾斜轴的一种特例,通过一坐标变换矩阵即可将尾斜轴的动力学方程变换为水平传动轴的动力学方程。分析了直升机空间机动飞行对尾传动轴横向弯曲振动特性的影响。结果表明:直升机的机动飞行会对尾传动轴的横向弯曲振动产生附加的刚度效应、阻尼效应和激励效应,使得传动轴轨迹中心的位置和运动轨道的大小发生改变。 相似文献
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智能弹簧装置减振性能的影响因素分析 总被引:2,自引:1,他引:1
建立了基于智能弹簧的某旋转机械主动减振力学模型和振动控制状态方程。利用数值仿真的方法,分析了压电陶瓷器作动器的作动力、智能弹簧结构参数和滑动摩擦力速度影响系数对智能弹簧装置减振性能的影响。结果表明,随着作动力的增大,系统振幅减小,减振性能增强。智能弹簧有阻尼控制和刚度控制两种控制方式。刚度控制对旋转机械恒转速运行和过临界转速时均有很好的减振效果,阻尼控制仅在过临界时才表现出其优良性能,然而对控制电压的要求更低;智能弹簧结构参数对减振性能影响明显,应根据具体的应用场合,合理选用智能弹簧结构参数;系统的相对速度越大,滑动摩擦力速度影响系数的取值越大,对减振性能的影响越明显。 相似文献
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The objective of this work was to study the vibration transmissibility characteristics of the undamped and damped smart spring systems. The frequency response characteristics of them were analyzed by using the equivalent linearization technique, and the possible types of the system motion were distinguished by using the starting and ending frequencies. The influences of system parameters on the vibration transmissibility characteristics were discussed. The following conclusions may be drawn from the analysis results. The undamped smart spring system may simultaneously have one starting frequency and one ending frequency or only have one starting frequency, and the damped system may simultaneously have two starting frequencies and one ending frequency. There is an optimal control parameter to make the peak value of the vibration transmissibility curve of the system be minimum. When the mass ratio is far away from the stiffness ratio, the vibration transmissibility is small. The effect of the damping ratio on the system vibration transmissibility is significant while the control parameter is less than its optimal value. But the influence of the relative damping ratio on the vibration transmissibility is small. 相似文献
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