Ultra-low frequency vertical vibration isolation system based on zero-length spring
We design and realize an ultra-low frequency vertical vibration isolation system based on the zero-length spring technology. In the system, a horizontal beam is supported by a zero-length spring and can oscillate with a nature period of 20 s. The movement of the beam is detected by an optical detector and a Proportional-Integral-Derivative control module (PID) is applied to compensate the system drift due to temperature change and spring creep. In addition, the impact of the control parameters on the oscillation period is analyzed. The integral control is necessary to compensate the system drift, and the proportional control is applied for adjusting the system elasticity. Additionally, the derivative control contributes to the system damping. By setting the control parameters appropriately, the oscillation period can be adjusted to more than 30 s. This vertical vibration isolation is important in precision measurement applications such as the ultra-high precision absolute gravimetry.
State Key Laboratory of Precision Measurement Technology & Instruments, NIM-THU Joint Institute for Measurement Science , Department of Precision Instruments, Tsinghua University, Beijing100084, China
We design and realize an ultra-low frequency vertical vibration isolation system based on the zero-length spring technology. In the system, a horizontal beam is supported by a zero-length spring and can oscillate with a nature period of 20 s. The movement of the beam is detected by an optical detector and a Proportional-Integral-Derivative control module (PID) is applied to compensate the system drift due to temperature change and spring creep. In addition, the impact of the control parameters on the oscillation period is analyzed. The integral control is necessary to compensate the system drift, and the proportional control is applied for adjusting the system elasticity. Additionally, the derivative control contributes to the system damping. By setting the control parameters appropriately, the oscillation period can be adjusted to more than 30 s. This vertical vibration isolation is important in precision measurement applications such as the ultra-high precision absolute gravimetry.
李 刚，胡 华，伍 康，王 观，王力军. 基于零长弹簧的超低频垂直隔振系统研究[J]. 振动与冲击, 2015, 34(7): 33-37.
Li Gang，Hu Hua，Wu Kang，Wang Guan，Wang Lijun. Ultra-low frequency vertical vibration isolation system based on zero-length spring. JOURNAL OF VIBRATION AND SHOCK, 2015, 34(7): 33-37.
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