GOALI: Nonlinear Vibration Absorbers for Multi-Frequency Excitation

这个学术与工业联络资助机会（GOALI）项目的目标是研究由多个调谐到不同频率的吸振器组成的系统中的动态相互作用。大多数调谐吸收装置的设计是为了减少在给定频率附近的振动，通常是为了抑制一个麻烦的振动模式的共振。例如，如果使用一组调谐到不同频率的吸收器来处理多种振动模式，吸收器之间可能发生非线性动态相互作用，导致吸收器系统的有效性显著降低。因此，多频吸收系统的优化设计需要对这些相互作用有一个基本的了解，这样才能避免它们。该研究项目旨在开发这一知识库，并将其应用于减少汽车动力系统多频扭转振动，例如，在采用汽缸停用的发动机中。该方法包括物理建模、通过摄动方法和计算机模拟进行分析、实验验证以及通过选择吸收器系统参数（特别是调谐和惯性）来制定满足性能规范的指导方针。所获得的结果将把减振器的知识库扩展到多频率激励的情况，这将允许在广泛的操作条件下提高减振器系统的有效性。这所大学和工业伙伴将密切合作，开发吸收系统，促进汽车发动机节油技术的实施，使它们能够在高效率的状态下运行，否则就会受到振动问题的困扰。这项研究的结果将通过技术出版物和专题报告广泛提供。研究活动也将在节能技术的一般背景下，由大学的pi和他们的研究生在面向初高中学生的暑期拓展项目中进行描述。

The goal of this Grant Opportunity for Academic Liaison with Industry (GOALI) project is to investigate dynamic interactions in systems composed of multiple vibration absorbers that are tuned to different frequencies. Most tuned absorber devices are designed to reduce vibrations near a given frequency, typically to suppress the resonance of a troublesome vibration mode. If one uses a set of absorbers tuned to different frequencies, for example, to address multiple vibration modes, nonlinear dynamic interactions between absorbers can occur, causing a significant reduction in the effectiveness of the absorber system. Thus, optimal design of multi-frequency absorber systems requires a fundamental understanding of these interactions, so that they can be avoided. The research program is aimed at developing this knowledge base and implementing it to reduce multi-frequency automotive powertrain torsional vibrations that occur, for example, in engines that employ cylinder deactivation. The approach involves a combination of physical modeling, analysis by perturbation methods and computer simulations, experimental verification, and development of guidelines for meeting performance specifications by selection of absorber system parameters, specifically, tunings and inertias.The results obtained will extend the knowledge base for vibration absorbers to situations with multi-frequency excitations, which will allow for improved effectiveness of absorber systems over a wide range of operating conditions. The university and industrial partners will work in close cooperation to develop absorber systems that will facilitate the implementation of fuel-saving technologies for automotive engines, by allowing them to operate in regimes with high efficiency that are otherwise plagued with vibration problems. The results of the research will be made widely accessible by technical publications and presentations. The research activity will also be described, in the general context of energy conservation technologies, by the university PIs and their graduate students in summer outreach programs geared to middle and high school students.