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PARAMETRIC CONTROL OF BLADE VIBRATIONS IN ROTATING MACHINERY

机译:旋转机械叶片振动的参数控制

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摘要

Parametric control is a useful method to reduce the vibrations of mechanical structures. For many applications the blading of rotating machines can be modeled as cantilever beams. In this paper the stiffness parameter of a cantilever beam structure representing a single blade model is subject of variation due to an applied feedback controlled parametric excitation force. A string is used inside the beam combined with a sensor/actuator system to apply this parametric force. Based on [1] and [2] a nonlinear feedback control law using state-dependent amplification of the axial velocity of the beam tip is developed to introduce artificial damping to the beam lateral motion, and to achieve boundedness of the applied force. The latter property is of importance for practical applications. Numerical simulations show that with the presented control law the artificial damping of the beam lateral motion can be increased significantly compared to [2].
机译:参数控制是减少机械结构振动的有用方法。对于许多应用,旋转机器的叶片可以建模为悬臂梁。在本文中,由于施加了反馈控制的参数激励力,代表单个叶片模型的悬臂梁结构的刚度参数发生变化。梁内部使用一根绳子,与传感器/执行器系统结合使用以施加此参数力。基于[1]和[2],开发了一种非线性反馈控制定律,该定律使用了状态依赖的梁尖端轴向速度的放大来将人工阻尼引入梁的横向运动中,并实现施加力的有限性。后一特性对于实际应用很重要。数值模拟表明,与[2]相比,利用所提出的控制律,可以显着提高梁横向运动的人工阻尼。

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