The Design And Implement Of The Electronic-Hydraulic Servo Multi-directional Wavemaker System

Simulating random movement of sea wave in the wave basin and making researchs into the action of sea wave on coastal and offshore structures could provide the reliable basis for engineering design and scientific experimentation. The multi-directional wavemaker is the key problem for the realization of the physical model test.This paper introduces the composition and working principle of the electronic-hydraulic servo multi-directional wavemaker system,.The control software of the wavemaker system is based on windows operating system and adopts VC++ development platform,which has the advantages of visualization,high efficiency and strong agility. The software could realize the wavemaker system control,data acpuisition,data analysis and sensor calibration, the applacation of multi-thread technology, precise timing technology and memory management technology in the wavemaker system is described respectively. Furthermore,the software realizes real-time display of sampling process with DirectX technology and adopts object-oriented thinking to handle interfacing card. Estimateing spectrum with AR model and calibrating the sensor with least square algorithm are also discussed in detail. Finally the system is tested and the performance indexes are given.The multi-directional wavemaker system could generate very precise multi-directional random waves. The system has passed the expert appraisal organized by the Ministry of Education. The performance indexes of The multi-directional wave-maker system are consistent with international leading level.