Research And Development Of CAD System For Comprehensive Visual Effects Of Civil Servo Cockpit

This paper is a subsidiary of the national basic research program of China (973program NO.2010CB734102). There is no doubt cockpit design has effect on air safety greatly. As a result, research of cockpit ergonomics is an extremely important component of the man-machine-environment system. Based on the fact there’s no useful and reliable system for assisting the researches of cockpit ergonomics, this paper is aim to develop such a system by summarizing the common contents of cockpit ergonomic researches and extracting the key parameters of the objects in cockpit. The design concept of this system is to obtain the indexes that can present the visual performance by simulating the visual tasks to the subjects. Researches of cockpit ergonomics can be conducted with this system conveniently.By literature review, this paper summarizes the characteristic of the lighting environment of cockpit and introduces the factors that can interfere with visual performance of pilots. Relative vision theories of pilot’s vision characteristic are introduced. Based on these theories and the common methods of cockpit ergonomics, this paper defines the indexes of the system:visual acuity, visibility level, identification accuracy/identification time/identification speed, detection accuracy and reaction time.By comparing of the common programming tools, this paper chooses Lab VIEW as the developing tool of the system. According to the determined indexes, the system develops different visual tasks into different modules for each index. The visual tasks of the system are as follows:detecting object, identifying Landolt rings, measuring visual acuity, measuring visibility level and identifying vibrating object. The system chooses Landolt ring as the main object and specifies identifying tasks of them in various ways. This system also provides the conventional formulas for data analysis. Moreover, this system can calculate the results, save and output them.Finally, this paper describes several experiments to verify the system. The first is the research of the effects of luminous contrast of display in cockpit on visual performance. The second is the research of the effects of vibration on visual performance. These two experiments separately use the visual tasks of detecting object and identifying vibrating object of the system. The results of these two experiments prove the validity and reliability of the system. Besides, this paper describes the experiment of luminous determination of the push-button annunciators in cockpit. Purely subjective rating using a psychological scale is the main method of this experiment. These three experiments shows the advantages and disadvantages of two different methods used in cockpit ergonomic research. The comparison of these two methods provides references to the researches of cockpit ergonomics.