大部件对接中iGPS高精度位姿测量优化设计

 为保证大部件对接位姿测量精度,提高对接测量效率,实现大部件最优位姿装配,提出了基于iGPS测量系统的大部件对接位姿测量优化设计方法。首先,基于iGPS系统测量模型和不确定度模型建立对接测量网络,并对其网络测量精度进行仿真分析,优化设计了对接测量网络iGPS多发射器的布站方式;其次,基于对大部件位姿参数求解模型及不确定度模型的仿真分析,优化设计了调姿基准点的布设方式;最后,对某机型大部件对接进行了位姿测量方式的对比实验。结果表明,经过位姿测量优化设计后,大部件对接测量x、y、z的位置调整不确定度均小于0.16 mm,姿态滚转角、俯仰角和偏航角的角度调整不确定度均小于3.1",相较于未经布站优化设计的测量方式,精度至少提高了20%。由此证明该测量优化设计方案能够高效、高精度地对移动大部件进行实时位姿测量,在有效提高大部件对接位姿测量效率及精度方面是可行的。

Optimal design based on iGPS high-precision posture measurement for large size component joining

In order to ensure the accuracy and improve the efficiency of posture measurement for large size component joining, at the same time, to achieve large size optimal component posture assembly, optimal design technology based on iGPS measurement system of posture measurement for large size component joining has been put forward. Firstly, the joining measurement network based on iGPS system measurement model and uncertainty model is established; then, the accuracy of network measurement is analyzed by simulation and iGPS multi-transmitter station distribution of joining measurement network is designed optimally. Secondly, the station distribution of posture alignment benchmark points is designed optimally based on simulation analysis of large size component posture parameters'' solving model and uncertainty model. Finally, posture measurement mode contrast test is conducted on a large size component joining. The results indicate that the position adjustment uncertainty of x, y, z is less than 0.16 mm and the attitude adjustment uncertainty of attitude roll angle, pitch angle and deflection angle is less than 3.1". The accuracy is improved by at least 20% compared to the measurement methods without optimal arrangement design. Consequently, it is proved that the method of measurement optimal design can measure a large mobile part in real time efficiently and with high accuracy, and it is feasible to effectively improve the efficiency and accuracy of large size component measurement .