Session: 05-05-02 Aquaculture and Related Technology II

Paper Number: 104685

104685 - Proposal for Motion Stabilized Platform for Offshore Wind Observations by Doppler Lidar and Its Validation 

It is necessary to obtain accurately actual wind state at the sea where offshore wind farm will be constructed to guarantee its safety and profitability.  In our research group, some methods to reduce motion of floating platform caused by wave, wind and current for offshore wind observations by Doppler Lidar have been investigated, and a spar-buoy with ring-fin motion stabilizer with tension-moored has been proposed for shallow sea and the same spar-buoy with relaxation moored has been proposed for deep sea.  However, the spar-buoy is not small, therefore it requires high installation cost. 

As another method, in this study, a rigid body swing with motion control as a motion stabilized platform of Doppler Lidar to place on floating platform is investigated.  First, a counter-weight type motion stabilized platform is proposed, and its effectiveness of motion reduction on a spar-buoy type floating platform with a tension-moored is confirmed by simulation and model test.  Furthermore, skyhook damper and spring are installed to the motion stabilized platform and it is optimized, and it is confirmed by simulation that its effectiveness of motion reduction is significantly increase.  Finally, the motion stabilized platform is set on a discus-type floating platform whose motion is much larger than a spar-buoy type floating platform and complicate and its effectiveness is also confirmed by simulation.

Presenting Author: Yusuke Yamamoto Osaka Metropolitan University

Presenting Author Biography: I am a Ph. D Student of Osaka Metropolitan University.

Authors:

Yusuke Yamamoto Osaka Metropolitan University
Mizuki Kinugasa Osaka Metropolitan University
Hiroki Morota Osaka Metropolitan University
Toru Katayama Osaka Metropolitan University