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针对大口径望远镜由于自身尺度的增加以及钢桁架结构所带来的阻尼不足的情况,开展了大口径望远镜阻尼调制技术的研究,提出了一种基于动力学模型的调制质量阻尼器的设计方法。首先分析了现有的大口径望远镜的阻尼调制策略,选择了使用专门的阻尼调制器的解决方案;之后,研究了建立系统动力学缩减模型以及基于该模型的动力学检测方法,为阻尼调制器的设计打下基础。最后,设计了适应某大口径望远镜主镜模态的调制质量阻尼器。为验证文中的正确性,针对一阶固有频率为172 Hz实验系统进行了阻尼调制实验,使用调制质量阻尼器后,该频率所对应的响应有明显的下降。同时,对于用于验证的大口径望远镜,计算得到其141 Hz的主镜模态对应的调制质量阻尼器质量为7.015 kg。刚度为5.506 N/mm。提出了一种基于动力学模型的调制质量阻尼器的设计方法。分析了现有大口径望远镜的阻尼调制策略,选择了使用专门阻尼调制器的解决方案,不仅可指导下一代望远镜的建设工作,还可以对现有设备进行有效的升级。
In view of the large scale telescope’s increase of its own scale and the lack of damping brought by the steel truss structure, the research on damping modulation technology of large aperture telescope is carried out. A design method of modulation mass damper based on dynamic model is proposed. Firstly, the damping modulation strategy of the existing large-aperture telescope is analyzed and the solution of using the special damping modulator is selected. Then, the system dynamics reduction model and the dynamic detection method based on the model are studied. Design laid the foundation. Finally, a modulation quality damper adapted to the mode of the primary mirror of a large-aperture telescope is designed. In order to verify the correctness of the paper, a damping modulation experiment was carried out for the first-order natural frequency 172 Hz experimental system. The response of this frequency decreased obviously after the modulation mass damper was used. In the meantime, for the large-aperture telescope used for verification, the mass damper quality corresponding to the main mirror mode of 141 Hz is calculated to be 7.015 kg. Stiffness is 5.506 N / mm. A design method of modulation mass damper based on dynamic model is proposed. The damping modulation strategy of the existing large-aperture telescope is analyzed, and the solution of using the special damping modulator is selected, which can not only guide the construction work of the next generation telescope, but also effectively upgrade the existing equipment.