Research of vibration damping of floating rafts for mobile wind lidars

HAN Fei; HU Mingyong; BI Yong; CHEN Yuan; DU Ning; CHEN Ze

doi:10.7510/jgjs.issn.1001-3806.2016.01.011

In order to reduce the impact of vibration on measurement accuracy and stability of a mobile wind lidar, a vibration-damping floating raft was designed by referring to the successful application of floating rafts in the field of ships. The damping performance of mobile system was analyzed in the circulation of harmonic excitation by using multi-body dynamics modeling method. The damping effects of dampers' parameters were obtained. According to the dampers' parameters and the selected model, the peak value of passing rate after calculation avoided effectively excitation frequency during vehicles' transportation. The values of passing rate were less than 1 in effective frequency range. Meanwhile, the vibration range under the action of shock after calculation wasn't beyond the effective range of damping. Experimental results were consistent with theoretical requirements. By comparing the wind speed measured with a lidar and balloons under the vibration, the effect of damping design on measurement precision is proved. By comparing the locking frequency effect of lidar in the stable situation and in the vibration situation, the reliability of damping design is further certified. The results show that the application of floating raft damping is reasonable and successful in mobile wind lidars.

Research of vibration damping of floating rafts for mobile wind lidars

Corresponding author: HU Mingyong, fzstn@sina.com;

1. Nanjing Research Centre of Astronomical Instruments, Chinese Academy of Science, Nanjing 210042, China;

2. University of Chinese Academy of Sciences, Beijing 100039, China;

3. Nanjing Astronomical Instruments Ltd., Chinese Academy of Science, Nanjing 210042, China

Received Date: 2014-11-04

Accepted Date: 2014-11-17

Available Online: 2016-01-25

Abstract: In order to reduce the impact of vibration on measurement accuracy and stability of a mobile wind lidar, a vibration-damping floating raft was designed by referring to the successful application of floating rafts in the field of ships. The damping performance of mobile system was analyzed in the circulation of harmonic excitation by using multi-body dynamics modeling method. The damping effects of dampers' parameters were obtained. According to the dampers' parameters and the selected model, the peak value of passing rate after calculation avoided effectively excitation frequency during vehicles' transportation. The values of passing rate were less than 1 in effective frequency range. Meanwhile, the vibration range under the action of shock after calculation wasn't beyond the effective range of damping. Experimental results were consistent with theoretical requirements. By comparing the wind speed measured with a lidar and balloons under the vibration, the effect of damping design on measurement precision is proved. By comparing the locking frequency effect of lidar in the stable situation and in the vibration situation, the reliability of damping design is further certified. The results show that the application of floating raft damping is reasonable and successful in mobile wind lidars.

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Reference (16)

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Research of vibration damping of floating rafts for mobile wind lidars

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