Transfer of Energy from High-Frequency to Low-Frequency Modes in Structures

结构中能量从高频模式转移到低频模式

• 批准号: 9423774
• 负责人: Ali Nayfeh
• 金额: $ 18万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-09-15 至 1999-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9423774&HistoricalAwards=false
• 关键词: Transfer; Energy; Frequency; Low; Modes

9423774 Nayfeh An analytical and experimental investigation is conducted in to the transfer of energy from high-frequency to low- frequency modes in the responses of multi-degree of-freedom and distributed-parameter dynamic systems subjected to periodic excitations. Exchanges of energy between widely spaced modes are generic to certain classes of nonlinear systems and because of possible dire consequences, e.g., instability or chaotic motions, require a complete understanding. This research project demonstrates the energy- transfer phenomenon via relevant experiments; formulation of analytical models to explain the interactions between widely spaced modes of structures and using them to determine conditions under which energy can be transferred from high- frequency to low-frequency modes, as observed in the experiments; and the use of developed analytical models to identify possible control schemes to suppress these potentially dangerous transfers of energy.***

9423774 Nayfeh 对受到周期性激励的多自由度和分布参数动态系统的响应中能量从高频模式到低频模式的转移进行了分析和实验研究。宽间隔模式之间的能量交换对于某些类别的非线性系统来说是通用的，并且由于可能产生可怕的后果，例如不稳定或混沌运动，因此需要完整的理解。本研究项目通过相关实验论证了能量转移现象；制定分析模型来解释广泛分布的结构模式之间的相互作用，并使用它们来确定能量可以从高频模式转移到低频模式的条件，如实验中观察到的；以及使用开发的分析模型来确定可能的控制方案，以抑制这些潜在危险的能量转移。***