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首页> 外文会议>AD-vol.69; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20041113-19; Anaheim,CA(US) >ACTIVE VIBRATION CONTROL OF PERIODIC ROTATING SHAFTS
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ACTIVE VIBRATION CONTROL OF PERIODIC ROTATING SHAFTS

机译：主动旋转轴的振动控制

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摘要

The propagation of transverse waves in periodic rotating shafts is controlled actively by using piezoelectric inserts which are placed periodically along these shafts. The control strategies aim at tuning the unique filtering characteristics of the periodic shafts in such manner that prevent the propagation of the waves within specific frequency bands called "stop bands". The spectral characteristics of these "stop bands" are controlled in response to the shaft vibration. A finite element model is developed for this class of actively controlled periodic shafts which is then used to generate the "transfer matrix" for the unit cell of these shafts. The eigenvalues of the resulting transfer matrix are utilized to predict the characteristics of the stop and the pass bands of the rotating shaft as function of the shaft geometry, rotation speed, and control gains of the active inserts. The obtained characteristics are validated experimentally using shafts driven via gearbox assembly which subject the shafts to broadband excitations. The obtained results are also compared with the characteristics of passive shafts with stepped periodic geometries. Such a comparison aims at demonstrating the effectiveness of the active periodic shafts in redistributing the energy spectrum by confining the propagation to specific frequency bands. Particular emphasis is placed on studying the effect of the active control strategies on the vibration dampisg characteristics of the shafts. The proposed class of active periodic shafts can be useful in numerous critical applications such as the drive shafts of helicopters where transmitted vibrations can have detrimental effect on the performance of the tail rotor. Other applications are only limited by our imagination.
机译：横波在周期性旋转轴中的传播是通过使用沿这些轴周期性放置的压电插件来主动控制的。该控制策略旨在以防止波在称为“阻带”的特定频带内传播的方式来调整周期轴的独特滤波特性。这些“阻带”的光谱特性是根据轴振动来控制的。针对此类主动控制的周期轴开发了有限元模型，然后将其用于生成这些轴的单位单元的“传递矩阵”。所得传递矩阵的特征值可用于预测旋转轴的挡块和通带的特性，该特性随轴几何形状，旋转速度和有效刀片的控制增益而变化。使用通过齿轮箱组件驱动的轴对轴进行宽带激励进行实验验证了所获得的特性。还将获得的结果与具有阶梯式周期性几何形状的被动轴的特性进行比较。这样的比较旨在通过将传播限制在特定的频带内来证明主动周期轴在重新分配能谱方面的有效性。特别强调研究主动控制策略对轴振动阻尼特性的影响。提议的主动周期轴类别可用于许多关键应用中，例如直升机的传动轴，在这些应用中，传递的振动会对尾桨的性能产生不利影响。其他应用程序仅受我们的想象力限制。

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