| Most of the road traffic accidents result from the harmony unbalance among the driver, vehicle, road, and environment, how to carry out traffic safety research from the harmony of combined operation of DVR (driver-vehicle-road and environment), and how to take the design principle of "people first and based on vehicle" into consideration in the highway engineering and safety engineering is one of the key issues of traffic science and technology development. This dissertation firstly puts forward a new research thinking path which takes research and application of visual simulation technology for combined operation of DVR system as the entry point of taking "people first and based on vehicle" into consideration in the highway engineering and safety engineering. Through the simulation tests aimed at design scheme of highway alignment, landscape, traffic engineering facilities, and safety engineering on the visual simulation platform of combined operation of DVR, the DVR harmony of the design scheme is investigated, which provides the high-tech research means for the investigation of highway transportation related issues.Against the technology system of visual simulation for harmony evaluation of combined operation of DVR, this dissertation studies the following contents from three aspects of driver, vehicle, road and environment.1. This dissertation puts forward the concepts of auto mode and interaction mode in combined operation of DVR, and builds the road safety evaluation model based on the visual simulation platform.2. This dissertation studies the inducement property of road and traffic environment to driving speed in quantity, and establishes the vehicle speed control model of driver in auto mode. Through the field perception evaluation tests on typical highway segments, this dissertation studies fuzzy evaluation method of the safety perception factors to road conditions of driver on the basis of the effective comment data. Taking the average vehicle speed and road structure parameters measured on typical highway segments as the sample, this dissertation studies the modeling technology of the rules of vehicle speed fuzzy control of driver for safety consideration, and obtains the logical deduction model of driver's vehicle speed control with the acceleration/deceleration model.3. This dissertation studies the vehicle dynamics modeling technology and key implementation technology of network real-time solution to vehicle dynamics in the visual simulation platform of combined operation of DVR, and discusses the implementation technology of vehicle 3-D geometry model database and vision rendering. Against the characteristic of real-time solution to vehicle dynamics, theeleven-DOF 3-D vehicle dynamics model for visual simulation is investigated. The vehicle dynamics model consists of overall vehicle handling stability model, tire model, steering system model, engine model, brake system model, and etc. The vehicle dynamics network real-time solution software is developed by use of Winsock communication technology. Through the study on 3-D vehicle geometry modeling technology, the 3-D model database of car, truck, off-road vehicle, and bus is established by use of the Multigen Creator software system. The means for improving real-time operating of vehicle model are studied by use of LOD model simplification technology. The methods for improving the model reality are also studied by use of such illumination model and texture mapping as realistic image technology.4. This dissertation studies the 3-D modeling technology of terrain, road and environment, and the technological means for improving the model reality and real-time operating in the visual simulation platform of combined operation of DVR. The 3-D terrain modeling technology is introduced on the basis of fractal theory and real terrain data, and the optimized display technology of terrain is studied on the basis of chop texture and clip texture. The draw priority, external references and instances technologies are used to accelerate the display the road and environment model database.5. This dissertation studies the hardware implementation technology in virtual simulation platform of combined operation of DVR, sets up a hardware platform, and investigates the interactive signals collection technology on the basis of semi-physical model in interaction mode. The hardware platform design consists of three parts, the first part is the design of RC (reality center) system, the second part is the design of driving test stand, the third part is the development of data collection system, that is, the data collection and calibration of handling signal, i.e., acceleration pedal, brake pedal, clutch, transmission, steering wheel and etc. based on singlechip system and serial communication technologies. Furthermore, to improve the general purpose of visual simulation platform, the DirectX8.0 SDK is used to design the data collection interface of simulator.6. This dissertation studies the software implementation technology in visual simulation of combined operation of DVR, develops a software system, and carries out the virtual tests based on the visual simulation platform. Scene simulation module is developed by use of MFC and Vega API; the free driving vehicle behavior in traffic environment is simulated by use of Multi-Agent theory; the collision detection algorithm is used to solve the impact issues of vehicle against road and environment objects; OpenGL performer is used to display the simulation situation information dynamically; Winsock technology is used to display the multi-channel scene synchronously; the AVI recording and playing of simulation process is also investigated.In general, the key points of innovation in this dissertation mainly rest in the following aspects: 1. This dissertation firstly puts forward a new research thinking path which takes research and application of visual simulation technology for combined operation of DVR system as the entry point of taking "people first and based on vehicle" into consideration in the highway engineering and safety engineering.2. For the first time, this dissertation puts forward and discusses the concepts of auto mode and interaction mode simulation.3. For the first time, this dissertation studies the inducement property of road and traffic environment to driving speed in quantity, and establishes the vehicle speed control model of driver.4. This dissertation develops the network real-time solution software of vehicle dynamics based on the eleven-DOF 3-D vehicle dynamics model.5. This dissertation firstly studies the modeling principle and implementation technology of 3-D road model based on the Creator systematically.6. For the first time, this dissertation studies the implementation technology on visual simulation of combined operation of DVR and develops a visual simulation platform of combined operation of DVR.
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