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首页> 外文期刊>International journal of non-linear mechanics >Mitigation of nonlinear oscillations of a Jeffcott rotor System with an optimized damper and nonlinear energy sink
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Mitigation of nonlinear oscillations of a Jeffcott rotor System with an optimized damper and nonlinear energy sink

机译：带有优化阻尼器和非线性能量吸收器的Jeffcott转子系统的非线性振荡的缓解

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摘要

Contact occurrence between disk and stator as result of undesirable vibrations produced by eccentricity of the disk is one of the most destructive and common phenomena in rotor dynamics systems. In this work, utilizing tuned mass damper (TMD) and nonlinear energy sink (NES) are suggested as a solution for preventing contact occurrence. The mass and angular position of absorbers determine their efficiency for resisting the eccentricity force produced by the disk, and their stiffness and damping coefficients determine the displacement scope of the absorber. In order to efficiently design absorbers, optimization is proposed. In this suggested optimization process, complex averaging method is used in order for deriving the equations of motion of the system in presence of dynamic absorbers at the steady state condition. Afterwards, for determining trustworthiness of each absorber's performance, system's behavior is studied for different values of its parameters such as rotational speed, stiffness, clearance and eccentricity in presence of each absorber. From the obtained results, it can be perceived that TMD and NES are as efficient as possible and they have exactly the same positive influence on the system's vibrations. The reliability of the proposed optimization process can be determined by the results. (C) 2017 Elsevier Ltd. All rights reserved.
机译：由于盘的偏心产生的不希望的振动而导致的盘与定子之间的接触发生是转子动力学系统中最具破坏性和最普遍的现象之一。在这项工作中，建议使用调谐质量阻尼器（TMD）和非线性能量吸收器（NES）作为防止接触发生的解决方案。减震器的质量和角度位置决定了其抵抗圆盘产生的偏心力的效率，而其刚度和阻尼系数则决定了减震器的位移范围。为了有效地设计吸收体，提出了优化方法。在此建议的优化过程中，为了在稳态条件下存在动态吸收器的情况下，使用复数平均方法来推导系统的运动方程。然后，为了确定每个吸收器性能的可信赖性，针对每个吸收器存在时其转速，刚度，游隙和偏心率等参数的不同值，研究系统的行为。从获得的结果可以看出，TMD和NES尽可能高效，并且它们对系统的振动具有完全相同的积极影响。所提出的优化过程的可靠性可以由结果确定。 （C）2017 Elsevier Ltd.保留所有权利。

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