Vibration Absorbers for Systems with Cyclic Symmetry
用于循环对称系统的减振器
基本信息
- 批准号:0408842
- 负责人:
- 金额:$ 13万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2004
- 资助国家:美国
- 起止时间:2004-08-15 至 2007-03-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The goal of this work is to investigate the performance of order-tuned absorbers for vibration reduction in cyclic and nearly cyclic systems. The applications of interest are structural systems such as turbine blades, bladed disk assemblies, blisks (integral disk-blade systems), and helicopter rotor blades. These flexible structures rotate at a constant speed and are subjected to traveling wave dynamic loading, resulting in component vibrations that can cause high cycle fatigue failure, noise, reduced performance, and other undesirable effects. A natural means of reducing these vibrations and their attendant problems is the implementation of tuned vibration absorbers. Centrifugally-driven, order-tuned vibration absorbers are ideally suited for this task, yet this approach has received scant attention to date.This project will consider a systematic study of the performance of order-tuned vibration absorbers in individual rotating flexible components and in cyclic systems of interconnected substructures. The basic design features of these absorbers will be explored by considering a hierarchy of models for rotating structural elements fitted with absorbers. The models for the structural members will range from single-degree-of-freedom oscillators to industry-based finite element models. The features of the absorber models will be focused on design-related parameters, specifically: the placement of the absorber on the primary structure, the absorber mass ratio relative to that of the primary structure, the path along which the absorber travels (which sets its linear and nonlinear tuning parameters), and the effects of impacts when the absorber reaches its rattle space limitations. The response of these systems will be analyzed by exploiting the symmetry of the system and will utilize a range of tools that includes linear vibration analysis for cyclic systems, perturbation and bifurcation techniques for symmetric nonlinear systems, matching methods for impacting motions, hybrid time-frequency domain techniques, and simulations of equations of motion. The effects of unavoidable imperfections that destroy the perfect cyclic symmetry (such as blade mistuning) will also be considered. It is known that certain patterns of mistuning among subsystems can drastically reduce worst-case forced response levels, and we will examine the effectiveness of using absorbers tuned to different orders to achieve these effects. In this case the absorbers will serve a dual purpose: to attenuate vibrations in the blade to which they are attached, as well as to provide a pattern of system detuning that reduces vibrations in the overall structure. The general aim of these analyses will be to provide predictive tools that can be used to help select absorber parameters for optimal performance.The proposed research will impact the fundamental understanding of the performance of vibration absorbers, as described above, and will also involve education, outreach, and technology transfer. In terms of education, the PIs will include the linear vibration analyses of these systems in standard vibration courses at both the undergraduate and graduate levels, and some of the nonlinear aspects of the systems will be used as motivating examples and exercises for graduate courses in nonlinear vibrations. In addition, the Michigan State University PIs are involved in a summer outreach program that exposes high school students to the mechanical engineering profession. One topic presented to the students is the practical use of vibration absorbers, and their application to systems such as turbine blades in jet engines will be a natural fit into that program. In the area of technology transfer, the University of Michigan PIs have considerable experience in the area of turbomachinery, and a number of industrial contacts. The results of the research will be shared with representatives from aircraft engine manufacturers, and it is anticipated that the work on absorbers will be guided in part by considerations raised during discussions with them. Overall, the goal will be to transfer the basic knowledge gained by this research into the classroom, to young aspiring engineers, and to industry.
这项工作的目标是研究阶数调谐吸振器在循环和近循环系统中减振的性能。 感兴趣的应用是结构系统,如涡轮机叶片,叶盘组件,整体叶盘(整体盘叶片系统),和直升机旋翼叶片。 这些柔性结构以恒定速度旋转并且经受行波动态载荷,导致部件振动,该部件振动可引起高周疲劳失效、噪声、性能降低和其它不期望的影响。 减少这些振动及其伴随问题的自然手段是实施调谐振动吸收器。 主动驱动的阶次调谐吸振器非常适合于这一任务,但这种方法迄今很少受到关注,本项目将考虑系统地研究阶次调谐吸振器在单个旋转柔性部件和互连子结构循环系统中的性能。 这些吸收器的基本设计特征将通过考虑装有吸收器的旋转结构元件的模型层次来探讨。 结构构件的模型范围从单自由度振荡器到基于行业的有限元模型。 吸振器模型的特点将集中在与设计相关的参数上,特别是:吸振器在主结构上的位置、吸振器相对于主结构的质量比、吸振器行进的路径沿着(设置其线性和非线性调谐参数)以及当吸振器达到其振动空间限制时的冲击效应。 这些系统的响应将通过利用系统的对称性进行分析,并将利用一系列工具,包括循环系统的线性振动分析,对称非线性系统的扰动和分叉技术,碰撞运动的匹配方法,混合时频域技术,以及运动方程的模拟。 破坏完美循环对称的不可避免的缺陷(如叶片失谐)的影响也将被考虑。 众所周知,某些模式的子系统之间的失谐可以大大降低最坏情况下的强迫响应水平,我们将检查使用不同的顺序调谐到实现这些效果的吸收剂的有效性。 在这种情况下,吸收器将用于双重目的:衰减它们所附接的叶片中的振动,以及提供减少整个结构中的振动的系统失谐模式。 这些分析的总体目标是提供预测工具,可用于帮助选择减振器参数以获得最佳性能。拟议的研究将影响对减振器性能的基本理解,如上所述,还将涉及教育,推广和技术转让。 在教育方面,PI将包括这些系统的线性振动分析在标准的振动课程在本科和研究生水平,和一些系统的非线性方面将被用作激励的例子和练习的研究生课程在非线性振动。此外,密歇根州立大学的PI参与了一个夏季外展计划,使高中生接触机械工程专业。 其中一个主题是介绍给学生的实际使用的振动吸收器,和他们的应用系统,如涡轮机叶片在喷气发动机将是一个自然适合到该计划。 在技术转让领域,密歇根大学的PI在技术转让领域有相当丰富的经验,并与一些工业界有联系。 研究结果将与飞机发动机制造商的代表分享,预计减震器方面的工作将在一定程度上以与他们讨论期间提出的考虑因素为指导。 总的来说,我们的目标是将这项研究所获得的基本知识转移到课堂上,年轻的有抱负的工程师和行业。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Christophe Pierre其他文献
Automatic volumetric temperature regulation during in vivo MRI-guided laser-induced thermotherapy (MRg-LITT) with multiple laser probes
- DOI:
10.1016/j.compbiomed.2024.109445 - 发表时间:
2025-01-01 - 期刊:
- 影响因子:
- 作者:
Manon Desclides;Valéry Ozenne;Pierre Bour;Thibaut Faller;Guillaume Machinet;Christophe Pierre;Julie Carcreff;Stéphane Chemouny;Bruno Quesson - 通讯作者:
Bruno Quesson
A new formulation for the torsional vibration analysis of rotating cantilever rods
- DOI:
10.1007/bf02944888 - 发表时间:
1997-03-01 - 期刊:
- 影响因子:1.700
- 作者:
Hong H. Yoo;Christophe Pierre;Robert R. Ryan - 通讯作者:
Robert R. Ryan
Christophe Pierre的其他文献
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{{ truncateString('Christophe Pierre', 18)}}的其他基金
Graduate Research Fellowship Program (GRFP)
研究生研究奖学金计划(GRFP)
- 批准号:
1753809 - 财政年份:2017
- 资助金额:
$ 13万 - 项目类别:
Fellowship Award
Vibration Absorbers for Systems with Cyclic Symmetry
用于循环对称系统的减振器
- 批准号:
0632441 - 财政年份:2005
- 资助金额:
$ 13万 - 项目类别:
Standard Grant
Mid-Frequency Vibration Analysis of Complex Structures
复杂结构的中频振动分析
- 批准号:
9634954 - 财政年份:1997
- 资助金额:
$ 13万 - 项目类别:
Standard Grant
Localization Phenomena in Structural Dynamics
结构动力学中的局域化现象
- 批准号:
8913196 - 财政年份:1990
- 资助金额:
$ 13万 - 项目类别:
Continuing Grant
Research Initiation: Structural Stiffness Variations in Flexible Multibody Dynamic Systems
研究启动:柔性多体动态系统中的结构刚度变化
- 批准号:
8809430 - 财政年份:1988
- 资助金额:
$ 13万 - 项目类别:
Standard Grant
Localization of Vibrations by Structural Irregularity
结构不规则性引起的振动局部化
- 批准号:
8700820 - 财政年份:1987
- 资助金额:
$ 13万 - 项目类别:
Continuing Grant
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