Research On Visual Simulation In Cutter Suction Dredging Simulation Training System

"The research of dredging process training simulator" is a part of the project "Research And Development Of New Equipment And Technologies In The 1750m3/h Cutter Suction Dredger", which is a Chinese Ninth Five Years Key Project. The dredging process training simulator is used to train the operator so as to make the dredging process more efficient. The system uses a lot of new techniques including computer science, multimedia technology and computer graphics science and so on. According to the visual system of the dredging process training simulator, this paper presents many important techniques such as three-dimension objects modeling, mathematics description of the virtual objects motion relations, the minimal-shape software engineering method, multi-thread program and so on.Firstly, this paper introduces the main software engineering techniques and analyzes the excellence and limitation of each one. The minimal-shape software engineering method is adopted according to the characteristic of the project. Secondly, the paper gives out the procedure of the three-dimensional dredge boat modeling, which uses the VR (Virtual Reality) tool-MultiGen. Establishing the DOF (DOF, Degree Of Freedom) of the VR model and the VR model motion relations are depicted in the third chapter. At last, the paper presented the visualization implementation of the under working state for a cutter suction dredging simulator in detail after a brief introductions of the basic knowledge of computer graphics science. This part includes terrain visualization, interactive operations between VR model and control panel, the profile system of the dredge working state and so on. Also in this part, multi-thread programming and network communications are presented. In the visual system one thread process receives the control signal and the other take charge of the refreshing window.This technique solves the delay phenomenon between the visual system and the operations on the control panel.As a part of the dredging process training simulator, the visual system can display the result of the trainee's operation on the screen in real-time. This simplifies the evaluation procedure and perfects the function of the dredging simulation training system. The whole system provides a way for the trainee to dredge efficiently.