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针对大载荷对象低频微振动主动振动控制平台的设计问题,提出一种基于模块拼装思想的主被动混合隔振平台结构方案,模块化设计大大简化了主动振动控制平台的设计难度,使得拼装后的平台具有承载能力强、精度高等优点,由于所用模块单元结构形式完全相同,组合后的主动隔振平台的特性完全取决于单元的特性;以主动隔振单元为研究对象运用有限元法建立其动力学模型,模型中包含以位移向量形式表示的外界激振项和以力向量形式表示的主动控制项,当上述两项为零时,可以通过求解动力学模型得到主动隔振单元的固有特性;利用ANSYS商用软件进行主动隔振单元的模态分析,对比结果验证了该动力学模型的正确性.
Aiming at the design problem of low-frequency micro-vibration active vibration control platform of large load object, this paper proposes a structure scheme of active and passive vibration isolation platform based on modular assembly idea. The modular design greatly simplifies the design of active vibration control platform, The platform has the advantages of strong carrying capacity and high precision. Due to the identical structure of module unit used, the characteristics of the combined active vibration isolation platform are completely determined by the characteristics of the unit. The active vibration isolation unit is used as the research object to establish its power The model includes the external excitation term in the form of displacement vector and the active control term in the form of force vector. When the above two items are zero, the inherent characteristics of the active vibration isolation unit can be obtained by solving the dynamic model. The modal analysis of the active vibration isolating unit was carried out by commercial software ANSYS. The comparison results verify the correctness of the dynamic model.