The Control And Realization Of Wave Maker

Wave-making technology is an important test technology; wave maker is an important tester. They both occupy the important position in those Filed, such as ship, port, coastal engineering, ocean engineering. It has been more than years since Wave maker and its theory appeared.Wave-making theory is the application of wave theory to wave maker, the foundation of wave maker design, the basis of theory wave maker Control. Wave-making theory, the research state and development of wave maker are described. The essential and absorbing wave-making theory are outlined. The concept and theory of automatic control are applied to the control of absorbing wave maker.At present, AC servo wave maker shows the advanced development of wave maker at aboard, and also the developing trend of wave maker in china. AC servo wave maker is mad up of ball crew, parallels, wave-making plate in machine, is made up of AC servo motor, Driver, Motion Controller and PC in electric. In the AC servo 16 cells rocker-flap pool wave make and in the AC servo single plate push flume wave maker, programming implementation of motion control has achieved. On the base of LabWindows/CVI (C for Virtual Instrumentation) which is a C language development p lat form owned by National Instrument, wave-making program system has been realized. The program system includes communication, system setup, 2D regular generation, 2D irregular generation, data acquisition and real time display, spectrum analysis, statistics analysis.Except for a wave height probe which is installed before plate, absorbing wave maker is the same as common one. From the point of wave-making theory, it has that name. When the motion that has the adverse phase of the reflected wave is been done, at the same time do the wave-making motion, the second reflected wave caused by wave-making plate is been avoided. From the point of automatic control, absorbing wave maker is a fully closed loop one. On the base of wave-making plate's position of inside loop, real-time wave height of outside loop is added, named wave-form feedback. Common wave maker only has position feedback. In order to do the research about absorbing wave-making technology, we do following things: installing a AC servo single plate push flume wave maker on a glass flume which is 0.4m wide and 15m long; compiling and debugging of program, including common wave-making and absorbing wave-making; acquitting wave height , calculating and adjusting wave-making plate's position, 1000 times per second. As a result of test data, when active absorption is used, the surface cloud quickly turn to calmness; when absorbing wave-making is used, wave height automatically adjusts to setting value, and wave shape keep good stability. That both digital filtering and control arithmetic must be real-time is the key in the control of absorbing wave maker.