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首页> 外文期刊>Applied and Computational Mechanics >Determination of the transient vibrations of a rigid rotor attenuated by a semiactive magnetorheological damping device by means of computational modelling
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Determination of the transient vibrations of a rigid rotor attenuated by a semiactive magnetorheological damping device by means of computational modelling

机译：通过计算模型确定由半主动磁流变阻尼装置衰减的刚性转子的瞬态振动

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摘要

Unbalance is the principal source of increase of time varying forces transmitted between the rotor and its stationary part. Their magnitudes can be considerably reduced if the rotor is flexibly suspended and if the damping devices are added to the support elements. Their damping effect must be high for low rotor velocities and small for velocities approximately higher than the critical one to minimize the transmitted forces and the vibrations amplitude. This implies to achieve maximum efficiency of the damping elements, their damping effect has to be adaptable to the current operating conditions. Such technological solution is offered by application of a squeeze film magnetorheological damper. Its hybrid variant consisting of two damping units (one controllable) in a serial arrangement is investigated in this paper. The damping takes place in two concentric lubricating films formed by normal and magnetorheological oils. The damper is equipped with an electric coil generating magnetic flux passing through the layer of the magnetorheological fluid. As resistance against its flow depends on magnetic induction, changing magnitude of the applied current enables to control the damping force. In the computational model, the rotor is considered to be absolutely rigid, unbalanced and the damping elements are represented by force couplings. The goal of the analysis is to study influence of the investigated magnetorheological damper on behaviour of a rigid rotor during different transient regimes. A special attention is focused on passing the rotor through the critical speed and on planning the dependence of the applied current on speed of the rotor rotation to achieve the optimum compromise between minimizing the transmitted forces and maximum attenuation of the rotor vibrations.
机译：不平衡是增加在转子及其静止部件之间传递的时变力的主要来源。如果转子被灵活地悬挂并且如果阻尼装置被添加到支撑元件上，则它们的大小可以被显着减小。对于低转子速度，其阻尼效果必须较高，而对于近似高于临界转速的速度，其阻尼效果必须较小，以最大程度地减小传递的力和振动幅度。这意味着要实现阻尼元件的最大效率，其阻尼效果必须适应当前的运行条件。通过使用挤压膜磁流变阻尼器提供了这种技术解决方案。本文研究了由两个阻尼单元（一个可控）串联组成的混合动力变体。阻尼发生在两个由普通和磁流变油形成的同心润滑膜中。阻尼器配备有电线圈，该电线圈产生穿过磁流变流体层的磁通量。由于其流动的阻力取决于磁感应强度，因此改变施加电流的大小可以控制阻尼力。在计算模型中，转子被认为是绝对刚性的，不平衡的，并且阻尼元件由力偶合表示。分析的目的是研究所研究的磁流变阻尼器在不同瞬态期间对刚性转子行为的影响。特别要注意的是使转子通过临界速度，并计划施加电流对转子旋转速度的依赖性，以在使传递力最小和转子振动的最大衰减之间达到最佳平衡。

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