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| CENTRIFUGE MODELING STUDY OF CYCLIC WAVE LOAD ON BREAKWATER IN DEEP WATER |
| JIANG Minmin1，CAI Zhengyin1，2，XU Guangming2，WANG Zhixuan3，XIAO Zhaoran1 |
| (1. School of Civil Engineering and Architecture，Henan University of Technology，Zhengzhou，Henan 450001，China；2. Nanjing Hydraulic Research Institute，Nanjing，Jiangsu 210024，China；3. Center of Test Science and Experiment，Jilin University，Changchun，Jilin 130026，China) |
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Abstract A new non-contact cyclic wave load generation system for centrifuge model test is developed. Through computer controlled load device，the system can simulate storm wave load on breakwater in deep water. The system solves the problems accounted in previous study such as difficulty in energy dissipation，generating additional constraint and mass，and applying of reversal load that is hard to be carried out. Then a new measuring and controlling system is developed for dynamic centrifuge model test，which contains four functional modules：high speed data acquisition，low pass digital filter for signal noise and interference removal，modified proportion integration differentiation(PID) load control and signal generation control. The system also optimizes load control and data acquisition functions in dynamic centrifuge test. The feasibility of non-contact wave load generation system is verified by suction caisson breakwater centrifuge model test. Test results show that the device can apply wave load accurately and steadily，and can adjust load amplitude randomly. Cyclic displacement characteristics of suction caisson breakwater under wave load are as follows：accumulated value and amplitude of dynamic tilt angle both increase；horizontal displacement amplitude increases notably；while accumulated value of vertical displacement increases significantly. Suction caisson breakwater has oscillation-rock coupled motion mode.
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Received: 25 December 2012
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2013, Vol. 32 
