US-Egypt Cooperative Research: On-Line Tonal Tuning of a Variable Inertia Vibration Absorber

描述：该奖项旨在支持伊利诺伊州迪卡尔布北伊利诺伊大学机械工程系的Behrooz Fallahi博士和Mohamed Seif博士以及埃及开罗大学机械设计与生产系的Said Megahed博士的合作项目。他们计划研究一种新型自适应调谐减振器（TVA：可变有效惯性减振器）的动力学和控制。该方法包括两个方面：激励的频谱分析和吸收器的在线调谐。谱分析揭示了激励的频率含量。在线调谐利用激励的频率内容来重新定位运动质量以抑制音调振动。分析工作，包括方程的线性化及其影响的研究，将辅以实验研究，以评估所提出的音调调谐方法的有效性。该方法的新颖之处在于在线进行吸振器调谐以抑制音调振动，移动二次质量会改变吸振器的谐振频率，并推导出具有时变控制参数的动力学方程。适用范围：该技术可广泛应用于民用建筑、飞机机翼、潜艇外壳和直升机舱室等工业领域。振动抑制装置的稳定性始终得到保证。美国和埃及的合作者在机械动力系统，振动和控制以及机器人和自动化系统的应用方面有着强大的研究记录和经验。双方相辅相成，Megahed博士在建模和仿真方面特别有经验，而美国团队在实验的规划和执行以及数据分析方面特别强。该提案符合INT在共同感兴趣的领域支持合作研究的目标。该项目得到了美国-埃及联合基金项目的支持，该项目向两国的科学家和工程师提供赠款，以开展这些合作活动。

0108951FallahiDescription: This award is to support a collaborative project by Dr. Behrooz Fallahi and Dr. Mohamed Seif, both in the Department of Mechanical Engineering, Northern Illinois University, Dekalb, Illinois, and Dr. Said Megahed, Mechanical Design and Production Department, Cairo University, Cairo, Egypt. They plan to study the dynamics and control of a new class of adaptive Tuned Vibration Absorber (TVA: variable effective inertia absorber). The approach has two facets: spectral analysis of the excitation and online tuning of the absorber. The spectral analysis reveals the frequency content of the excitation. The online tuning uses the frequency content of the excitation to reposition a moving mass for tonal vibration suppression. The analytical work, involving linearization of equations and study of its effect, will be supplemented by experimental study to assess the effectiveness of the proposed tonal tuning method. The novelty of the method is that the absorber tuning is done online for tonal vibration suppression, that moving a secondary mass changes absorber resonant frequency, and that the dynamic equation is derived with time dependent control parameter.Scope: The proposed technique may be widely implemented in industrial cases such as civic structures, airplane wings, submarine hulls, and helicopter cabins. The stability of the vibration suppression device is always guaranteed. The US and Egyptian collaborator have strong records of research and experience in mechanical dynamic systems, vibrations and control, and application to robotics and automating systems. The two sides complement each other, as Dr. Megahed is particularly experienced in modeling and simulation, while the US team is particularly strong in the planning and execution of the experiments and in the analysis of the data. The proposal meets the INT objective of supporting collaborative research in areas of mutual interest. This project is being supported under the US-Egypt Joint Fund Program, which provides grants to scientists and engineers in both countries to carry out these cooperative activities.