A New Positioning Device Designed for Aircraft Automated Alignment System 2019-01-1883
Accurate and fast positioning of large aircraft component is of great importance for Automated Alignment System. The Ball joint is a widely-used mechanical device connecting the aircraft component and Automated Alignment System. However, there are some shortcomings for the device in man-machine engineering, such as the entry state of the ball-head still needs to be confirmed by the workers and then switched to the locking state manually. To solve above problems, a new positioning mechanism is present in this paper, which consists of a ball-head and a ball-socket. The new device is equipped with a monocular vision system, in which a calibrated industrial camera is used to collect the images of the ball-head. And then, the 3-D coordinate of the ball-head center is calculated by a designed algorithm, which combines the symmetry of the sphere and the principle of projection transformation, guiding the positioner to capture the ball-head. Once the ball-head gets into the ball-socket, the pneumatic system inside the ball-socket will drive the piston to move to the specified location. Meanwhile, the amount of compression of a set of springs has changed, so the steel balls are compelled to compress, contact or separate the ball-head, which means the states can be switched automatically. At last, an experiment is carried out to verify the accuracy of the visual system through a standard length rod measurement. The experimental results indicate that the design of the new positioning device with ergonomics can not only reduce the labor intensity, but also improve the assembly efficiency.
Jie Huang, Long Yu, Yilian Zhang, Yuhan Wang
Shanghai Jiao Tong University, Shanghai Top NC Tech Co Ltd