摘要
在机翼精加工过程中,需要对机翼的位姿进行计算,以指导其调整。通过对翼面水平测量原理的分析,提出一种基于随机测量点的机翼精加工位姿计算方法。首先,以翼面水平测量数据为基础,采用以最小二乘法为目标函数的迭代最近点算法,求解出测量点在翼面设计模型上的匹配点,形成位姿计算所需的2个点集。然后,运用Levenberg-Marquardt算法计算出这2个点集间的变换关系,实现位姿参数的求解。最后,为减少测量点误差对位姿计算的影响,给出了测量点精度补偿方法。仿真算例表明,该方法具有较高的计算精度,能够满足实际工程需求。
During the process of aircraft wing finishing machining, it is required to calculate the posture of aircraft wing to guide its adjustment. A new method is proposed to calculate the posture for aircraft wing finishing machining through analyzing the level-measuring principle of aircraft wing. Firstly, according to the levelmeasuring data, the proposed method searches the matching points on the theoretic airfoil surface by using the iterative closest point（ICP） algorithm. Two point sets, including level-measuring point set and its matching point set, are established. Then, Levenberg-Marquardt（L-M） algorithm is used to find the rotation and translation relationships between the two point sets. Finally, in order to reduce the influence of measuring point error on posture calculating, a accuracy compensation method for measuring points is proposed. Simulation shows that the method reaches high precision and can meet the actual engineering requirements.
出处
《航空制造技术》
2015年第6期72-76,79,共6页
Aeronautical Manufacturing Technology
