Research On Fuzzy Control Applied In The Deep Sea Mining Compensate Simulation System

With the exhaust of the resource in mainland, people draw their attention to the expans i on sea, the hydraulie lift mining system is widely used as a new technology in the deep sea polymetallic manganese nodules mining, during the mining period, owning to the impact of the wind, wave, flow, tide, the mining ship produce the heave motion along the gravity direction inevitably. If the connection between the mining ship and lifting mining pipeline is rigid.The lifting mining pipeline will produce tension and bend distortion. In order to raise the stability , dependability, using life, efficiency and economy. We need to install a set of compensation equipment between upper of the lifting mining pipeline and the mining ship in order to maintain the normal deep sea mining process. The aim of the installation of the lifting mining pipeline heave compensation system is to maintain the quiescence of the mining ship when the lifting mining pipeline heave with the wave and minimize the changing axis stress and distortion possibly. This paper aimed at the shortcoming of traditional compensation technology and put forward a new type of an active electro-hydraulic servo compensation system. The successful develop of this system provide the technology accumulate for the deep mining in the Sea area for our country.The experiment system is composed of industry computer, proportional valve, grating displacement sensor, data acquisition card and D/A card. They are the hardware realization foundation. We apply VB as development tools and combined with VC,MIATLAB,ACCESS validly. We apply the DLL and ActiveX technology to realize the function of real-time control, graphic display, data save and data process etc.The software adopts the module construction which is expansible and revisable. The interface of the system is simple, practical and perfect.Owing to the time changing, non-linear, uncertain mathematics model of thehydraulic system. We bring forward fuzzy control idea. The system adopt three ma i n contro I method i nc I ud i ng fuzzy control, fuzzy self-adj ustment PID contro I , fuzzy PID hybrid controI. The exper i ment resu11 approve that they have good robust character compared with traditional PID control. The fuzzy PID hybrid control is superior and practical among them.During the following experiment, we are urgent to develop a type of more advanced contro I method , for examp I e , the NN contro I , expert contro I to perfect the control way of the system and elevate the compensate precision to a new standard. At the same time, we need to collect the actual signal of mining ship under the complex sea status as the simulate signal to test the robust and self-adaptive ability of the control method.