空间柔性机械臂弯扭耦合振动的主动控制研究
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浙江大学,浙江大学,浙江大学,浙江大学

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国家自然科学基金项目(面上项目)


Active control of bending-torsional-coupled vibration of a space flexible manipulator
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Zhejiang University,Zhejiang University,,

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The National Natural Science Foundation of China (General Program)

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    摘要:

    由于太空机械臂的结构形式和末端操作对象的影响,空间多连杆机械臂系统存在着强烈的刚柔耦合的非线性特性。针对伺服驱动的空间柔性机械臂系统,基于经典振动理论,提出柔性臂弹性弯曲、扭转的变形假设,然后采用假设模态法和Lagrange方程得到系统的动力学方程。为了抑制系统在大范围运动过程中的弯曲、扭转弹性振动,提出了基于Lyapunov稳定性的模糊自适应速度反馈控制策略。数值仿真结果表明:空间机械臂系统在转动过程中必然会激起柔性臂的弹性振动;采用提出的控制策略利用压电剪切致动器和压电扭转致动器不仅可以抑制柔性臂的弯曲和扭转振动,还可以降低伺服电机的驱动扭矩,提高柔性机械臂系统的末端定位精度。

    Abstract:

    The space multi-link manipulator is a complex nonlinear system, due to the rigid-flexible and bending– torsional coupling effects, and the problem of vibration will be caused when slewing and external disturbance excitation, which will affect the stability of the system. Based on classical vibration theory, the bending and torsional deformation assumptions for the flexible manipulators are proposed, and the dynamic equations of a space flexible manipulator are established using assumed mode methods and Lagrange equations. To suppress the elastic vibration, an adaptive fuzzy velocity control strategy based on Lyapunov stability is presented. The simulation results show that the elastic vibrations of the flexible manipulators aren’t avoidable in the rotating motion. Using the proposed control strategy, both the bending and torsional vibration of the flexible manipulators are effectively suppressed under control of the PZT shear actuator and torsional actuator, furthermore, the precision of the rotating motion is improved, which leads to a reduction of the control torque of the servo-motor. Therefore, the active control technologies of vibrationSsuppression for the space flexible manipulator system are achieved, and the positioning accuracy is also improved.

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娄军强,魏燕定,杨依领,谢锋然.空间柔性机械臂弯扭耦合振动的主动控制研究[J].振动工程学报,2014,27(3).[Lou Junqiang, Wei Yanding, and. Active control of bending-torsional-coupled vibration of a space flexible manipulator[J]. Journal of Vibration Engineering,2014,27(3).]

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  • 收稿日期:2013-01-15
  • 最后修改日期:2014-06-12
  • 录用日期:2013-09-27
  • 在线发布日期: 2014-09-11
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