Research And Design Of Control System For The False Bottom In Marine Engineering Pool

The offshore engineering pool is designed to meet the needs of marine engineering research and experiment in a certain proportion to simulate marine environment such as sea breeze,ocean wave and ocean current.Ocean Engineering basin mainly through steel structure lifting in the bottom of the pool bottom to adjust the depth of the pool,the pool will be part of the marine engineering water pump installed in the floor below around the bottom make circulation on the design.Bottom lifting control at present is the main device or buoyancy blocks are installed in the bottom up through the buoyancy control;the winch pulling down at the pool bottom at the lower end of the rope down link.Requirements of marine engineering pool design based on a practical project of the university building design a new floor lift control method and design the whole bottom control system.This paper on the basis of marine engineering pool design requires the establishment of 3D modeling,and design a kind of using 4 hoist synchronous control direct lift pseudosubstrate control mode,then the control system on the whole floor system is designed,the control system mainly consists of three parts,false bottom lifting control unit under water control unit,comprehensive the monitoring unit.Secondly,The design and selection of the hardware and software of the three control unit control system of ocean engineering basin bottom,including power supply,PLC controller,frequency converter and the control box and the external interface connecting cable and bottom on the platform of sensor selection design;the software part mainly includes the design of control unit and software design ideas,design of communication function and the control system for the safe operation of all.Finally,the bottom lift control single motor frequency control method in the system and the multi motor synchronous control is studied,the selected variable frequency speed control of induction motor for SVPWM,using the conventional PID multi motor synchronization control strategy and synchronization control strategy of master-slave multi motor based on fuzzy PID respectively.The modeling is simulated by usingMatlab/Simulink and analysis.Analyzed and compared the final simulation results,it can be concluded that the master-slave synchronous control algorithm based on fuzzy PID self-tuning has better synchronization performance than the traditional PID master-slave synchronous control algorithm.Finally,master-slave synchronization control algorithm based on fuzzy PID self-tuning can be used.improve the stability of the system,it has a high dynamic performance.