新型半主动颗粒阻尼器耗能机理及动力学特性研究

The traditional passive particle damper may be applied in extreme temperature environments where most conventional dampers would fail. Passive particle damper is used in aerospace, mechinery and other fields. However, the damping effect is limited in the low frequency. In addition, it can not meet the needs of the complex external load.With excellent energy consumption performance and controllability of the semi-active particle damping technology is expected to solve the lack of traditional particle damping technology. but its energy dissipation mechanism and nonlinear dynamics characteristicsis unknown. This item focuses on the study of the nonlinear dynamics theory and the damping characteristics of forecasting methods of the magnetic field-particle damper system. Firstly, the mechanical characteristics and particle motion law of magnetic field-particle damper system will be investigated. Secondly, the dynamics model of the magnetic field-particle damper system is established based on the discrete element method-finite element method, and the influence of control strategies on the vibration attenuation performances of system is research. Thirdly, through the orthogonal experiment of the magnetic field-particle damper system, based on the support vector machine its multi-parameter damping model of is established on particle, particle damper and control strategy. Lastly, an optical design method of magnetic field-particle damper system is presented. The objective of this study is to explore the nonlinear dynamic characteristics of magnetic field-particle damper system, and to provide guidance for application of magnetic field-particle damping and method for vibration and noise reduction of structure in extreme environment.

传统的被动颗粒阻尼技术已应用于航空、航天等领域，但在低频段其减振效果较差，且不能满足外载荷复杂变化时的减振需求。而具有优良耗能性和可控性的半主动颗粒阻尼技术有望解决传统颗粒阻尼技术的不足，但目前半主动颗粒阻尼技术的减振机理不详，动力学行为不明。本项目以磁场-颗粒阻尼半主动减振系统为研究对象，建立其耗能机理模型、动力学行为分析方法及阻尼特性预测方法。首先，分析半主动系统中各种力学特性，建立其耗能模型。其次，基于离散元-有限元法建立半主动系统动力学模型并求解，分析其动力学行为，研究各种半主动控制策略对减振效果的影响规律。再次，采用支持向量机建立多参数半主动系统阻尼比定量预测模型，并基于实验数据进行修正。最后，建立带多个半主动颗粒阻尼器系统的减振优化设计方法，最终建立一套半主动颗粒阻尼减振系统的设计方法。本项目为半主动颗粒阻尼技术的应用奠定理论和技术基础，为恶劣环境下结构的减振提供新的研究思路。

本项目以半主动颗粒阻尼半主动减振系统为研究对象，建立了其耗能机理模型、动力学行为分析方法及阻尼特性预测方法。首先，分析了半主动系统中各种力学特性，建立了其耗能模型。其次，基于离散元-有限元法建立了半主动系统动力学模型并求解，分析了其动力学行为，研究了各种半主动控制策略对减振效果的影响规律。再次，采用支持向量机建立了多参数半主动系统阻尼比定量预测模型，并基于实验数据进行修正。最终建立了一套半主动颗粒阻尼减振系统的设计方法。本项目为半主动颗粒阻尼技术的应用奠定了理论和技术基础，为恶劣环境下结构的减振提供了新的研究思路。