Li Qiang, Chen Zhiming, Xu Yan, Zhang Shengguo, He Zhaoyun, Li Yaqiong
Artifcial Intelligence School, Wuchang University of Technology, Wuhan 430223, China.
Research Center for Novel Computing Sensing and Intelligent Processing, Zhejiang Lab, Hangzhou 311121, China.
Rev Sci Instrum. 2024 Jul 1;95(7). doi: 10.1063/5.0218360.
In engineering practice, the external horizontal oscillations always influence the working performance of precise instruments, advanced manufacture equipment, and gravitational wave detection. In order to ensure the normal operation of these instruments, it is necessary to attenuate these vibrations adequately. The pendulum mechanism horizontal vibration isolator is an efficient method. Hence, this paper presents a type of two-stage tri-linear pendulum horizontal vibration isolator (TPHVI). The first-stage TPHVI is connected in series with the second-stage one. The dynamic equations of the two-stage TPHVI are subsequently established so that the vibration isolation performance of the two-stage TPHVI is acquired. The analysis result of the natural frequency of the two-stage TPHVI reveals that it can obtain a low frequency vibration isolation performance when the first-stage TPHVI swings in a small value. As a case study, an experimental rig is constructed. The measured transmissibility keeps in good agreement with the calculated one. The natural frequency of the second-stage TPHVI is 0.25 Hz. The initial vibration isolation frequency is 0.3 Hz. When the external frequency is 0.8 Hz, the transmissibility of the second-stage TPHVI reaches -20 dB. Meanwhile, when the external frequency is 3 Hz, the transmissibility of the second-stage TPHVI is -40 dB. These measured data demonstrate that the proposed two-stage TPHVI can realize low frequency vibration isolation horizontally, which will have broad application prospects in the field of ultra-precision in engineering practice.
在工程实践中，外部水平振动总是会影响精密仪器、先进制造设备和引力波探测的工作性能。为确保这些仪器的正常运行，充分衰减这些振动是必要的。摆式机构水平隔振器是一种有效的方法。因此，本文提出了一种两级三线性摆式水平隔振器（TPHVI）。第一级TPHVI与第二级串联连接。随后建立了两级TPHVI的动力学方程，从而获得了两级TPHVI的隔振性能。两级TPHVI固有频率的分析结果表明，当第一级TPHVI以较小值摆动时，它可以获得低频隔振性能。作为一个案例研究，构建了一个实验装置。测量得到的传递率与计算值吻合良好。第二级TPHVI的固有频率为0.25Hz。初始隔振频率为0.3Hz。当外部频率为0.8Hz时，第二级TPHVI的传递率达到-20dB。同时，当外部频率为3Hz时，第二级TPHVI的传递率为-40dB。这些测量数据表明，所提出的两级TPHVI能够在水平方向上实现低频隔振，在工程实践的超精密领域将具有广阔的应用前景。
