Ultra-low-frequency vertical vibration isolator based on a two-stage beam structure for absolute gravimetry

2016 ◽  
Vol 87 (10) ◽  
pp. 105101 ◽  
Author(s):  
G. Wang ◽  
K. Wu ◽  
H. Hu ◽  
G. Li ◽  
L. J. Wang
Keyword(s):  
Low Frequency ◽  
Vertical Vibration ◽  
Vibration Isolator ◽  
Beam Structure ◽  
Two Stage ◽  
Absolute Gravimetry

scholarly journals Ultra-low-frequency vertical vibration isolator based on a two-stage beam structure

2016 ◽  
Vol 65 (20) ◽  
pp. 200702
Author(s):  
Wang Guan ◽  
Hu Hua ◽  
Wu Kang ◽  
Li Gang ◽  
Wang Li-Jun
Keyword(s):  
Low Frequency ◽  
Vertical Vibration ◽  
Vibration Isolator ◽  
Beam Structure ◽  
Two Stage

Ultra-low frequency vertical vibration isolator based on LaCoste spring linkage

2014 ◽  
Vol 85 (10) ◽  
pp. 104502 ◽  
Author(s):  
G. Li ◽  
H. Hu ◽  
K. Wu ◽  
G. Wang ◽  
L. J. Wang
Keyword(s):  
Low Frequency ◽  
Vertical Vibration ◽  
Vibration Isolator

An active ultra-low frequency vertical vibration isolator

2016 ◽  
Author(s):  
G. Wang ◽  
H. Hu ◽  
K. Wu ◽  
G. Li ◽  
L. J. Wang
Keyword(s):  
Low Frequency ◽  
Vertical Vibration ◽  
Vibration Isolator

Novel Euler-LaCoste linkage as a very low frequency vertical vibration isolator

2012 ◽  
Vol 83 (8) ◽  
pp. 085108 ◽  
Author(s):  
M. A. Hosain ◽  
A. Sirr ◽  
L. Ju ◽  
D. G. Blair
Keyword(s):  
Low Frequency ◽  
Vertical Vibration ◽  
Vibration Isolator ◽  
Very Low Frequency

An Ultra-Low Frequency Active Vertical Vibration Isolator With Geometric Anti-Spring Structure

2017 ◽  
Author(s):  
Jiamin Yao ◽  
Kang Wu ◽  
Jin Qian ◽  
Guan Wang ◽  
Meiying Guo ◽  
...  
Keyword(s):  
Vibration Isolation ◽  
Low Frequency ◽  
Ground Vibration ◽  
Stage Structure ◽  
Target Object ◽  
Vertical Vibration ◽  
Vibration Isolator ◽  
Restoring Force ◽  
Second Stage ◽  
Allowable Load

Vibration isolators have been widely used to keep the target object from the ground vibration in order to improve the measurement accuracy. Nowadays, the ultra-low frequency vibration isolator based on a two-stage structure shows the best performance. Traditionally, vertically suspended springs are usually applied as the second-stage. As the requirement of the low stiffness, the springs need to be long, which brings the disadvantages of relatively large size and small allowable load. A novel ultra-low frequency active vertical vibration isolator is proposed in this paper, which applies geometric anti-spring (GAS) instead of the second-stage suspended springs. The isolated object (the second stage) is supported by GAS fixed on an inner frame (the first stage), and the inner frame is hung with supporting springs from the base of the vibration isolator. The inner frame is driven by a voice coil to track the motion of the isolated object according to the relative motion signal detected by a photoelectric detector. Ideally, GAS provides zero restoring force for the object, thus realizing a long natural resonance period. Experimental results show that the isolator can achieve a resonance period of 14.7 s, compared with a simulated result of 20.7 s. Therefore, it is accessible to reduce the isolator’s volume and increase the allowable load by replacing the traditional second-stage suspended springs with GAS, without harming the vibration isolation effect. Promisingly it will be applied in free-falling and atomic-interference absolute gravimeters, and other precise measurements.

Investigation on a two-stage platform of large stroke for broadband vertical vibration isolation

2018 ◽  
Vol 25 (6) ◽  
pp. 1233-1245 ◽  
Author(s):  
Xiling Xie ◽  
Mingke Ren ◽  
Hongbo Zheng ◽  
Zhiyi Zhang
Keyword(s):  
Vibration Isolation ◽  
Vertical Vibration ◽  
Optical Switches ◽  
Static Properties ◽  
Two Stage ◽  
Maximum Displacement ◽  
Primary Stage ◽  
Low Frequencies ◽  
Attenuation Rate ◽  
Secondary Stage

For the purpose of preventing vibration-sensitive optical switches from malfunction caused by broadband vertical vibration, a novel two-stage vibration isolation platform is proposed. The primary stage is a bellows-type isolator of large stroke and low isolation frequency, and the secondary stage is a small-stroke hybrid isolator composed of bellows and voice-coil actuators. In the primary stage, two pre-compressed horizontal bellows and one vertical bellows are used to counter the weight of the switch and to reduce the total height of the isolator. The static properties of the primary stage are analyzed, and the vibration isolation of the platform is investigated. Numerical results indicate that the two-stage platform is effective in isolating vertical vibration. Experiments are also conducted to verify the performance of the platform. It is exhibited that the transmissibility is less than 0 dB over 2 Hz, and the attenuation rate reaches −35 dB/dec at high frequencies. The frequency range of test is 2–200 Hz, and the maximum displacement is 10 mm at 2 Hz. In the secondary stage, the actuators can substantially suppress the resonance peak, and promote isolation performance at low frequencies.

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