Abstract
In the calibration process of the positioner, in order to obtain the accurate angular position information of each axis of the turntable, it is necessary to test the rotation accuracy of the turntable higher than the accuracy of the target gyroscope, in order to achieve the test and calibration of the positioner. Therefore, this paper uses the non-magnetic technology to carry out research on the pointing accuracy and motion control of the turntable. At the same time, the influence of grating installation error on precision detection is analysed. The influence of steady-state error of turntable on the motion accuracy of turntable is analysed. Finally, the influence of servo control parameters on the dynamic performance of turntable and the influence on steady-state error are analysed. The test of the corner positioning accuracy of the turntable is carried out. The positioning accuracy and motion control parameters of the two-axis precision non-magnetic turntable are obtained, and the PID adjustment is introduced to make the accuracy index of the non-magnetic turntable meet the requirements. The turntable can realize a non-magnetic working environment and can achieve the high precision required by the index under the driving of the ultrasonic motor.
Highlights
The turntable is generally divided into an inertial test bench and a simulation turntable for calibration, performance testing, and semi-physical simulation of aircraft guidance products [1, 2], testing the attitude angle variation of a single carrier or the relative motion between multiple carriers, the docking process, and other parameters [3, 4].In 1954, the turret developed by the Massachusetts Institute of Technology used photoelectric angle–measuring sensors and precision bearings, which improved the precision greatly and was put into production [5, 6]
The rotary table is driven by an ultrasonic motor to ensure the nonmagnetic and high-precision requirements of the turntable [11, 12]
It can be found that the following error in the motion of the turntable is very small, almost negligible, and a) P = 1.0, I = 0.05 b) P = 1.0, I = 0.06 c) P = 1, I = 0.08 Fig. 11 Azimuth-axis PID parameter tuning By setting the parameters of the two-axis precision turntable pitch axis at different angles, it was determined that the PID parameters at 1°/s rate were P = 0.5 and I = 0.02, as shown in Fig. 13; when the pitch-axis rotation speed was 1 /s, P = 1.0 and I = 0.1
Summary
The turntable is generally divided into an inertial test bench and a simulation turntable for calibration, performance testing, and semi-physical simulation of aircraft guidance products [1, 2], testing the attitude angle variation of a single carrier or the relative motion between multiple carriers, the docking process, and other parameters [3, 4]. In 2013, the five-axis flight simulation turret developed by Acutronic has successfully been able to meet the high-precision requirements for testing high-dynamic missile performance. Ultrasonic motors use the linear effects of piezoelectric materials to achieve linear or rotational motion through frictional coupling. They do not distort the magnetic field and achieve high precision [13, 14]. The positioning accuracy and control parameters of the two-axis precision nonmagnetic turntable were obtained, and the PID adjustment was introduced to make the accuracy index of the nonmagnetic turntable meet the requirements. The turntable could realize a nonmagnetic working environment and achieve the high precision required by the index under the driving of the ultrasonic motor [15]. Two-axis precision turntable control system construction and index requirements
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
