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Helicopter blades running elevation measurement using omnidirectional vision
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作者 Chengtao CAI xiangyu weng 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2017年第6期1974-1984,共11页
Omnidirectional dynamic space parameters of high-speed rotating helicopter blades are precise 3 D vector description of the blades. In particular, the elevation difference is directly related to the aerodynamic perfor... Omnidirectional dynamic space parameters of high-speed rotating helicopter blades are precise 3 D vector description of the blades. In particular, the elevation difference is directly related to the aerodynamic performance and maneuverability of the helicopter. The state of the art detection techniques based on optics and common vision have several drawbacks, such as high demands on devices but poor extensibility, limited measurement range and fixed measurement position. In this paper, a novel approach of helicopter blades running elevation measurement is proposed based on omnidirectional vision. With the advantages of panoramic visual imaging integration, 360° field of view and rotation in-variance, high-resolution images of all rotating blades positions are obtained at one time. By studying the non-linear calibration and calculation model of omnidirectional vision system, aiming at solving the problem of inaccurate visual space mapping model,the omnidirectional and full-scale measurement of the elevation difference are finalized. Experiments are carried out on our multifunctional simulation blades test system and the practical blades test tower, respectively. The experimental results demonstrate the effectiveness of the proposed method and show that the proposed method can considerably reduce the complexity of measurement. 展开更多
关键词 Full-scale measurement Helicopter blades elevation Non-linear calibration Omnidirectional vision Unified sphere model
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