Research On Visual Simulation Technology Applied In Marine Engine Room Simulator

In today's marine education field, engine room simulator has become an important means of marine engineering education and training. The traditional simulation way of engine room simulator is semi-physical simulation or two-dimensional software simulation. The simulation systems are still too professional, lack of dynamic display during application and can't see engine room real scene. Virtual reality technology provides a means to compensate for the lack of visual scene in engine room simulator. But the existing relative researches mostly focus on the development and application with commercial three-dimensional software. The relevant theory of visual system is not involved. This paper studies the principles of scene generation and interaction. A high quality engine room visual simulation system is achieved. The contents of this study are as follows:(1) Establish the geometric model of controllable pitch propeller ship engine room. The illumination and effect calculation is applied on the scene real-time rendering. Gives the methods, processes and techniques of engine room scene modeling. Establish the local illumination model with attenuation considered. Study the principle of environment mapping and bump mapping effects. Enhance the real-time and flexibility of scene rendering. Various materials of engine room equipments's surface is simulated.(2) Improve path planning algorithm so that it can be used to make automatic navigation in virtual engine room. Study and realize the human-computer interaction technologies in visual system, including navigation camera control, three-dimensional pick up and behavioral model. Improve the node's data structure of road map skelton, add into the max free circle radius for the determination of safety margin. Do global path search by A*algorithm, optimize the search results based on visibility rule. Design a virtual force for real-time guidance and obstacle avoidance and smooth during role's automatic roaming process. Achieved the camera control under different navigation mode. Enhance the effectiveness of three-dimensional pick up operation. Build the behavioral models of interactive points.(3) Build the engine room simulator visual simulation environment base on multi-channel stereo projection system. Proposed to use cubic spline function as blend function for projection image edge blending, thus improve the scene's blend effect. Realize the binocular stereo image algorithm by programming. Summarize the factors that affect the stereo effect.(4) Establish and improve the hull-engine-propeller's mathematical model of controllable pitch propeller ship. Achieve ship propulsion system's visual simulation in visual system. By regression analysis on parameters of diesel engine combustion model, replace the interpolation method with regression equation to calculate the parameters. Thus improve the diesel engine model's accuracy and versatility under variable working conditions. Realize propulsion system's virtual maneuvering and three-dimensional monitoring in virtual simulation environment.