Design Of Single Axis High Precision Turntable Control System

Turntable,as a high-precision and sophisticated optoelectronic integrated equipment,is an important component of inertial navigation and guidance system.Turntable plays an important role in aircraft design experiment,advanced complex weapon system design and radar servo control system.Therefore,the research on high-precision turntable has important significance and value for the development of national defense industry and economic and livelihood undertakings.This paper introduces the background and significance of turntable research,the current development of turntable at home and abroad,and various high-precision turntable control methods proposed by scholars at home and abroad.The composition,function and specific circuit realization of each part of the turntable control system are introduced in the form of modularization,and the transformation of the hardware part of the turntable is realized.Taking the transformed turntable control system as the research object,the hardware part of the turntable is analyzed,and the mathematical model of the high-precision single-axis turntable control system is established.It lays a foundation for further research on control methods through MATLAB simulation and physical turntable.In this paper,the design and improvement of the hardware circuit part of the turntable mainly includes the establishment of the DC brushless torque motor in the driving part of the single axis turntable.It is determined that the 19 position is definitely the photoelectric encoder.The STM32F103 processor is chosen as the core of the control circuit board,and the corresponding minimum system circuit and peripheral interface circuit are used to communicate with the upper computer control interface.The communication between the absolute photoelectric encoder and the feedback original part is converted to the control of the turntable through the analog and digital conversion element,which converts the digital quantity obtained by the control algorithm to the analog quantity of the driving motor operation.The software part mainly consists of the upper computer control interface written by VC++6.0,the instruction issuing and the data image displaying.The lower computer program is designed through the Keil u Vision5 software as the development platform,and the C-51 language,which is widely used in MCU programming,is chosen as the programming language.The control algorithm program is designed,and the control of the turntable is completed.This paper discusses and introduces the basic principles of the traditional PID controller and fuzzy PID two control methods,and designs the PID and fuzzy PID controller applied to the turntable system according to the specific controller design method of the two algorithms.Through MATALB simulation tool,the PID control and fuzzy PID control are tested for the control of the turntable without load,increasing load,interfering signal,tracking sine curve and applying wave force moment.The simulation results show that PID control and fuzzy PID control have good tracking ability for step signals,and the sinusoidal signals of 1HZ,5HZ,10 HZ can basically be realized.Better tracking is achieved,with smaller amplitude attenuation and phase.Finally,the traditional PID control and fuzzy PID control are applied to the physical control of the turntable.The results show that both the PID control and the fuzzy PID control can complete the control requirements of position accuracy within 10 angular seconds,speed error within 1%,amplitude attenuation and phase lag within 10% when tracking 10 HZ sinusoidal signal.Compared with the traditional PID control algorithm,the fuzzy PID control algorithm has smaller steady-state error and better control performance.