The Dynamics of Structures With Tuned Subsystems

本研究项目涉及开发与多个调谐减振器的系统的行为的更深入的理解，并利用这些知识，为减振器系统的设计提供改进的指导方针。从一个基本的动力学观点的工作涉及的动态响应的结构，其中连接多个调谐子系统的振动衰减的目的，虽然研究的重点是应用旋转机械，开发的技术是更广泛的适用，例如，平移振动吸收系统。在多吸振器领域，最近的结果表明，一个特殊的吸振器系统所需的协调运动可能会变得动态不稳定，导致在一个急剧减少的工作范围。建议的工作的分析部分的推力将集中在更一般的多个吸收器系统的动态性能，包括：多个吸收器的动态性能：一般路径的系统（包括：在工业应用中最常见的失谐圆形路径），在吸收器路径的缺陷的影响，和转子的灵活性的影响。 这项研究将大大扩展调谐吸收器应用于旋转系统的知识基础，并将提供对具有附加调谐子结构的一般类系统的动力学的更好理解。这样的理解可以被提炼成改进的设计准则，将包括一个一般类的系统的动态连接调谐子结构。这样的理解可以被提炼成改进的设计准则，其中将包括动态分叉及其对系统性能的影响。 将与工业联络机构交流信息，以便将研究集中在正确的方向上，并转移拟议研究所获得的理解。具体而言，汽车发动机（福特汽车公司）和轻型飞机/直升机发动机（德事隆莱康明公司）的制造商将对本研究的结果进行评估，并咨询方向。

This research project deals with developing a deeper understanding of the behavior of systems with multiple tuned vibration absorbers and to use this knowledge to offer improved guidelines for the design of absorber systems. From a fundamental dynamics viewpoint the work concerns the dynamic response of structures to which are attached multiple tuned subsystems for the purpose of vibration attenuation although the focus of research is on applications to rotating machinery, the techniques developed are more widely applicable, for example, to translational vibration absorber systems. In the area of multiple absorbers, recent results for a special absorber system have shown that the desired unison motion can become dynamically unstable, resulting in a drastic reduction in operating range. The thrust of the analytical portion of the proposed work will focus on the dynamic performance of more general multiple absorber systems, including: the dynamic performance of multiple absorber:systems with general paths (including: the mistuned circular paths most commonly found in industrial applications), the effects of imperfections in the absorber paths, and the effects of rotor flexibility. this research will significantly expand the knowledge base for tuned absorbers as applied to rotational systems and will offer an improved understanding of the dynamics of a general class of systems which have attached tuned substructures. Such understanding can be distilled into improved design guidelines that will include dynamics of a general class of systems which have attached tuned substructures. Such understanding can be distilled into improved design guidelines that will include dynamic bifurcation's and their effects on system performance. Exchange of information with industrial liaisons will be carried out in order to focus the research in the proper direction and to transfer the understanding gained by the proposed research. Specifically, manufactures of automotive engines (Ford Motor Company) and light aircraft/helicopter engines (Textron Lycoming) will be kept appraised of the results of this research and consulted for direction.