So , a kind of device is needed , which can be fixed on the airplanes and can provide the tractor drivers with the exact distance between the dangerous points and the barriers . furthermore , the device should alert the drivers with sounds and lights to minimize the possibility of these accidents and ensure the airplanes ’ safety 因此在飞机上安装一种测量障碍物距离的装置,让司机坐在牵引车内就能获得飞机危险点与障碍物之间的精确距离,并能通过声、光等形式提醒司机,这样就可以尽量减小车辆作业过程中的事故率,保障飞机的安全。
Integrated automation system possesses the character of advanced technology content , complicated structure , and novel operating method , close relation between each subsystem , thus in the process of construction , technical transformation and managing innovation , how to adapt the new environment , grasp advanced technology , and deeply analyze the danger point becomes especially important 由于综合自动化系统技术含量高、结构复杂、运行操作方式新颖、各子系统间联系紧密，所以在变电站综自设备的建设、技术改造和管理创新过程中，如何适应新环境、掌握新技术、深入分析危险点，对安全生产显得尤为重要。
The azimuths of the central principal axes of the dangerous sections on the frame of bulldozer are determined . the inertia moments to the central principal axes of the dangerous sections on the frame are calculated . this paper also determines the positions of the dangerous points and calculates the stress values of dangerous points on the dangerous sections 分析了推土机台车架在最危险工况下的受力状况，确定了台车架危险截面的形心主轴的方位、计算了台车架危险截面对形心主轴的惯性矩、确定了危险点的位置、计算了危险面上危险点的应力值。
The nsoft software of usa msc corporation is used to analyze the bump in the way of fatigue strength reliability on the basis of dynamic stress analysis , and getting all of measured points " fatigue strength reliability , fatigue strength dangerous positions of bump on different working situations are got by generally analyzing all o " f the data 在动应力分析的基础上，利用美国msc公司的nsoft软件对该型泵车进行了疲劳寿命分析，计算出泵车上所有测点的疲劳寿命，综合分析后得出该型泵车的疲劳寿命危险点。
Nowadays , in the process of airplane maintenance , when airplanes are towed to move on the parking apron or in the garage , they are often on the hazard of bumping with the garage wall or other barriers at the dangerous points ( such as head , wings or tail ) because of their bulkiness . but the maintainers have to avoid these accidents by eyes 目前,在飞机保养与维修过程中,由于飞机体积庞大,飞机在停机坪上或机库中被拖拽做地面移动时,机翼、机头、机尾等危险点,经常有可能与机库墙壁或其他障碍物碰撞,而维修人员只能靠目测来防止此类事故的发生。
