Be based on the design of the system of car function test of virtual reality technology and development

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As the development of fictitious prototype and virtual reality technology, a revolution was caused in automobile industry, the article uses fictitious prototype technology and virtual reality technology in the function experiment of car to come, designed a car fictitious test system, and with the car operate stability test is exemple undertook developing study, result proof, cooperate fictitious appearance and fictitious environment, fictitious experiment broke through the inadequacy of the evaluation such as original emulation curve, carry stereo vision equipment, the person can be enmeshed in the environment to come, experience the function of car with the means of closed circuit, broke through the means that at present vehicle performance evaluates. 1, foreword is fictitious the occurrence of prototype technology and virtual reality technology, improved the method of traditional car design and experiment. The digitlization car that uses design of fictitious prototype technology rises with union of complex and changeful fictitious experiment environment, undertake emulation driving with true driver, in order to inspect, listen, the action such as touch at the user, of made generation be personally on the scene be enmeshed, mutual move, person -- car -- environmental be in harmony is an organic whole, the vibration that can experience a car directly, tilt, noise equivalent fruit, undertake colliding without danger and attaint, turn over the ultimate experiment such as bend, the numeric curve that improved abstraction is emulated, broke through the daedal driver that be conveyed hard with mathematical model to experience wait for a problem with reaction, in the problem with the inchoate and seasonable potential discovery of the design, undertake adjustment correction, implementation is optimized, have economic fund, but the advantage such as sex of danger of repeatability, calm. Typical case has: Development cycle of the Si Lexin that overcome Lai car is shortened by 36 months to 24 months, ford company also is by 1999 announce development gave complete digitlization car. Benz company had finished digitlization car prototype before 1998, implemented more powerful virtual reality technology, can match to decorate a design to wait with automobile body system to the overall performance of the car in design phase undertake intuitionistic, comprehensive emulation analysis, evaluation is mixed improve. Accordingly the article is consulting on the foundation of a large number of data, had a car the design of fictitious test system, and with operating stability test is exemple undertook developing, via practical test and fictitious experiment contrast, fictitious experiment has better effect than traditional emulation data processing, person -- car -- environmental be in harmony is an organic whole, provided a brand-new means to study system of car closed circuit. Detailed introduction has below. 2, car of design of construction of system is fictitious test system is a complex system, the basic principle such as advanced sex, open sex, dependability is followed when the design, be based on object-oriented design thought, adopt administrative levels to change, the design method of modular, standardization, make the system is below the premise that maintains functional implementation, achieve structural rationalize. The car is fictitious test system is main by input module, fictitious experiment module and output module 3 parts are comprised, if pursue,1 is shown. Guide car model in fictitious environment, dominate a command according to the input of the user, undertake kinematic, kinetic analysis to car model, use analytic data to be in fictitious setting " process of experiment of fictitious emersion car " , the user is experienced through all sorts of sensor and experience the function of this car, reach the evaluation of function, undertake modification model parameter according to the evaluation, this process can repeat ceaselessly, undertake the modification of car parameter, till the car acquires best property. The face has simple description to its below. Graph structure of 1 system frame pursues 1.

Input module: Basically be to offer parameter of car, ground to change the input of the information such as the model, in this module, the data that importable also solid car experiments, use at be being compared with fictitious experiment. 2.

Fictitious experiment module: Basically learn to analyse module by motivation, interface module and fictitious experiment run module, module of dynamical credit analyse basically is the behaviour that changes model, driver according to the parameter of car the performance data of car of real time computation, provide emulation data for fictitious experiment module, fictitious experiment moving module basically is to be an user to provide distinct fictitious experiment environment, realize fictitious car to all sorts of condition in experiment process change and give an user this information feedback. Interface module emulates car the interface equipment such as part of operation part, fictitious moving environment, sensor and user in real time organic link becomes an organic whole. 3.

Function evaluates module: In this module, the user considers all sorts of sense experiences of fictitious experiment below different operating mode integratedly, undertake evaluating to the function of car, revise the parameter of car model according to evaluating a result, undertake optimizing designing. This method was broken through evaluate a standard to be built hard before, index is very difficult the inadequacy such as affirmatory, visible difference. In this module, also can experiment to fictitious experiment and solid car undertake contrast, undertake correction to car model according to the difference. 3, the development example author of fictitious test system with operating the fictitious experiment of stability is exemple undertook developing. The digitlization that uses ADAMS/Car software to build a car above all is fictitious prototype, undertook to its stability emulates an analysis operating, fictitious experiment environment uses WTK (WorldToolKit) and Visual C++ comes true, fictitious appearance part uses the ComponentWorks component implementation of NI company. Figure, distinct implementation will experiment in conveying the emulation data of kinetic analysis to fictitious environment, come through fictitious appearance the metabolic circumstance of accurate indication data. Use interactive technology, make the user has the experience on visual perception official not only, still can pass AGC---System of Viewer G stereo observation, be enmeshed in fictitious experiment environment, experience car function truly, undertake car function is evaluated thereby. Below with car operate the sheet in experiment of stability closed circuit moves line experiment is exemple undertake demonstrative, use ADAMS/Car, the author built the digitlization model of some car, move according to sheet line experiment method (wait like orbit, speed) designed control file, in car in kinetic emulation process, car of this file control makes its the course travel along the regulation, operate from the extraction in emulation analysis result next the main feature parameter of stability (like angular velocity of steering wheel corner, yaw, list horn and side direction acceleration) data, cooperate sheet to move the setting that the line experiments comes the change of itself of dynamic observation car and parameter. The specific parameter in be those who make an user accurate to know car campaign process changes, increased the function of fictitious appearance, use fictitious appearance to cooperate fictitious setting, the change of dynamic indication car in each parameter in emulation process. Show setting for more distinct fact be enmeshed feeling, the stereo setting that developed double viewport shows the result, pass AGC- - system of ViewerG stereo observation, can be enmeshed in fictitious trial setting, process of experiment of feeling, experience. Graph 2 for result of kinetic emulation analysis (speed is 100km/h) , graph 3 move for fictitious sheet the emulation setting in line experiment process and fictitious appearance change. (A) side slants displacement changes (the change of acceleration of corner of B) steering wheel, yaw angular velocity, side direction pursues 2 sheet move line test is main the metabolic contrail of parameter pursues 3 fictitious sheet move the emulation setting in line experiment process and fictitious appearance change 4, brief summary as fictitious prototype and virtual reality technology, take in the design of the car and experiment research respect very great progress. Use motivation of much system interconnected system to learn to analyse software to get car performance data, the test system of performance of fictitious implementation vehicle, can come true completely " indoor and fictitious experiment " , it is future of fictitious prototype system patulous, pass join equipment of a few control, be united in wedlock with fictitious setting photograph, the vibration that can make the user finds a car, side slants, the motion such as list, can get subjective feeling of the person in adding evaluation vehicle performance, come, have very strong real sense. As the development of the technology of the computer, image, technology such as sensor, fictitious experiment technology has the car to develop prospect goodly. CNC Milling