Research And Design Of 3D Bio-printer Control System

As the aging population intensifies and various major diseases occur frequently,more and more people need to use the method of tissue and organ transplantation to restore health and prolong life.Unfortunately,at present,the number of organ donations is far less than the patients' needs,and the patient who has received allogeneic organ transplants will also need to take drugs for a long time because of immune rejection.3D bio-printing is just to solve this problem.This topic closely follows this hot spot,a set of 3D bio-printer control system has been initially developed based on a comprehensive study of existing bio-printing technologies,including the design of control hardware and software.And it also researches the key control algorithms.First,using STM32ZET6 as the main controller,each functional module was designed in detail according to the module division of the control system hardware,including serial communication module,nozzle motion control module,temperature control module,nozzle extrusion control module and power module.And it described the specific working principle,and built the overall hardware.Secondly,it focuses on the motor control algorithm and temperature control algorithm.The basic S-shaped control curve was optimized and improved,and according to the hardware characteristics of the main controller,the application of motor acceleration and deceleration control is realized.Aiming at the shortcomings of traditional PID control,such as slow response speed and poor control effect on nonlinear systems,a control strategy that combines variable universe and adaptive fuzzy PID control is adopted to improve temperature control performance.Then the software development of PC and the lower computer was carried out in the programming environment of Microsoft Visual Studio and MDK respectively,and the software design of the control system was completed.Finally,relevant test experiments are carried out on the built control system platform,including temperature control experiments and physical printing experiments.The test results show that using three control algorithms to adjust the stage temperature from room temperature to the setting temperature,the designed variable-domain fuzzy PID controller has the best control effect.And the physical printing control has a high precision,which can reach 0.1mm and meet the current printing needs.The overall operation of the system is reliable and the print quality is good,which verifies the effectiveness of the designed control system.