Passive Nonlinear Automatic Balancing of Flexible Rotordynamic Structures

柔性转子动力结构的被动非线性自动平衡

基本信息

  • 批准号:
    0856471
  • 负责人:
  • 金额:
    $ 19.19万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2009
  • 资助国家:
    美国
  • 起止时间:
    2009-03-15 至 2012-08-31
  • 项目状态:
    已结题

项目摘要

Imbalance vibration is a significant concern in virtually all rotating structures and is an important problem in engineering. Strategies for imbalance vibration mitigation traditionally fall into two categories; i) passive balancing via attached eccentric masses, and ii) vibration suppression using tuned-mass absorbers or active bearing actuation. The aim of this project is to advance an alternative approach based on the principle of passive, nonlinear, automatic balancing. This approach requires use of a special class of balancing devices know as Autobalancers which have eccentric masses that freely revolve around the rotor?s axis of rotation. Automatic balancing is achieved through nonlinear dynamic interaction between the rotor?s lateral vibration and the balancer mass motions. At certain supercritical rotor speeds, the balancer masses naturally adjust their positions to cancel the rotor?s imbalance. A key advantage of the automatic balancing approach is its ability to naturally adapt to imbalance changes without requiring power, sensors or a control system. The overall goals of this project are to; a) develop a nonlinear dynamic analysis for predicting stability and limit-cycle behavior in flexible shaft and bladed-disk rotors fitted with autobalancer devices, b) explore novel kinematically modified autobalancer concepts to stabilize unwanted non-synchronous limit-cycle orbits in autobalancer systems, c) and explore placement and interaction of spatially distributed autobalancers to achieve multi-mode automatic balancing of flexible rotors. These analyses will be experimentally validated using a flexible-rotor/autobalancer testrig. The nonlinear dynamic analysis methods developed in this project will have important scientific impacts in other active research areas such as coupled fluid-structure dynamics, machine tool vibrations, and rotor-stator interaction problems. This research will also have future benefits on the safety, reliability and efficiency of many civil infrastructures, power generation, transportation and aerospace systems which depend on smooth operation of critical rotating machinery. For example, by gaining an understanding of automatic balancing behavior in bladed-disks, this research will reveal new insights and approaches into the use of autobalancers to enable self-adjusting blade-loss compensation in gas turbine engines which, in turn, will enhance aviation safety. This project also has a significant educational mission. By performing this research, the graduate student involved in this project will be trained with strong analytical and experimental research skills and will develop deep knowledge in areas of rotordynamics, structural vibrations and nonlinear dynamics. Additionally, during high school outreach activities at the University of Tennessee, the laboratory setups in this project will provide a hands-on demonstration which will facilitate an entrée point to motivate and inspire younger students to pursue a scientific career. These efforts will have broad impacts on teaching the next generation workforce and will have a positive influence on education in the East Tennessee region.
不平衡振动是几乎所有旋转结构中都存在的一个重要问题,也是工程中的一个重要问题。缓解不平衡振动的策略传统上分为两类;I)通过附加偏心质量进行被动平衡,ii)使用调谐质量吸收器或主动轴承驱动进行振动抑制。该项目的目的是提出一种基于被动、非线性、自动平衡原理的替代方法。这种方法需要使用一种特殊的平衡装置,称为自动平衡器,它具有绕转子自由旋转的偏心质量。S轴旋转。自动平衡是通过转子之间的非线性动态相互作用来实现的。S横向振动和平衡器质量运动。在一定的超临界转子转速下,平衡器质量自然地调整其位置以抵消转子?年代不平衡。自动平衡方法的一个关键优势是它能够自然地适应不平衡变化,而不需要电源、传感器或控制系统。本项目的总体目标是:A)发展非线性动态分析,用于预测安装了自平衡装置的柔性轴和叶盘转子的稳定性和极限环行为;b)探索新的运动学修正自平衡器概念,以稳定自平衡系统中不需要的非同步极限环轨道;c)探索空间分布的自平衡器的放置和相互作用,以实现柔性转子的多模式自动平衡。这些分析将通过柔性转子/自动平衡器测试进行实验验证。本项目发展的非线性动力分析方法将对其他活跃的研究领域,如耦合流固动力学、机床振动和转子-定子相互作用问题产生重要的科学影响。这项研究还将对许多民用基础设施、发电、运输和航空航天系统的安全性、可靠性和效率产生未来的好处,这些系统依赖于关键旋转机械的平稳运行。例如,通过了解叶片盘的自动平衡行为,本研究将揭示使用自动平衡器实现燃气涡轮发动机叶片损失补偿的自我调节的新见解和新方法,从而提高航空安全。这个项目还有一个重要的教育使命。通过进行这项研究,参与该项目的研究生将具有较强的分析和实验研究技能,并将在转子动力学,结构振动和非线性动力学领域发展深厚的知识。此外,在田纳西大学的高中推广活动中,本项目的实验室设置将提供一个实际操作的演示,这将有助于激励和激励年轻的学生追求科学事业。这些努力将对下一代劳动力的教学产生广泛影响,并将对东田纳西州地区的教育产生积极影响。

项目成果

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Hans DeSmidt其他文献

Imbalance vibration suppression for asymmetric rotors via an enhanced automatic dynamic balancer
  • DOI:
    10.1016/j.jsv.2022.117416
  • 发表时间:
    2023-02-17
  • 期刊:
  • 影响因子:
  • 作者:
    Xiaowen Su;Hans DeSmidt
  • 通讯作者:
    Hans DeSmidt
Non-linear behaviors of off-centered Planar eccentric rotor/autobalancer system mounted on asymmetric and rotational flexible foundation
  • DOI:
    10.1016/j.jsv.2018.05.019
  • 发表时间:
    2018-09-01
  • 期刊:
  • 影响因子:
  • 作者:
    DaeYi Jung;Hans DeSmidt
  • 通讯作者:
    Hans DeSmidt

Hans DeSmidt的其他文献

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{{ truncateString('Hans DeSmidt', 18)}}的其他基金

Collaborative Research: Hybrid Control of Gear System Vibration with Time-Varying Dynamics via Piezo-Composite Array
合作研究:通过压电复合材料阵列对时变动力学齿轮系统振动进行混合控制
  • 批准号:
    1129957
  • 财政年份:
    2011
  • 资助金额:
    $ 19.19万
  • 项目类别:
    Standard Grant
CAREER: Vibration-Based Active and Passive Damage Identification of Time-Varying Dynamical Systems with Applications to Rotating Structures
职业:基于振动的时变动力系统主动和被动损伤识别及其在旋转结构中的应用
  • 批准号:
    0748022
  • 财政年份:
    2008
  • 资助金额:
    $ 19.19万
  • 项目类别:
    Standard Grant

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