Research On The Experiment Of Data Acquisition System About Lower Limb Rehabilitation Training Robot

The acquisition and processing of biomedical signals is an important branch of the Biomedical Engineering, it Provides the essential data for basic research and clinical diagnosis,analysis of Biomedical Engineering. In order to meet the demands of teaching and scientific research, it is necessary to carry on the research and design about acquisition and Processing system of biomedical signals.This paper introduces the research background and significance of rehabilitative robot. The main task of the research is the design of data acquisition system for limbs rehabilitative training robot.Through analysis of the gait and gesture mechanical structure and the functional requirements of the data acquisition system, the general designing scheme of the data acquisition system has been proposed. The data acquisition system about lower limb rehabilitation training robot system of biomedical signals is composed of two parts: hardware and software.The hardware part mainly content of design include the selection of controller chip, the main circuit design, the serial communication interface design , the conditioning, amplifying and filtering of analog signal, interface level converter , A/D converting which are imposed on the signals , only after this can the signals enter the computer.C8051F021 has been chosen as the main controller chip of the servo control system. The support circuit for this chip is the main work of the main circuit design. Maxim 197 has been chosen as the A/D converte chip. The Maxim 197 includes high accuracy reference voltage supplies and time circuit inside,which can do A/D conversion without outside circuit and time circuit convenience.The software part mainly content of design include the deal with the acquisition data and control parts of the system. Do the program of chip microprocessor, collect data ,signal communication and control function by using C language .And ensure the communication between PC and MCU successfully, realize the monitoring of MCU by PC. In addition, calibrate the pressure sensor,and deal with sole force. Servo control algorithm is designed using MATLAB/Simulink and simulated based on dSPACE HWIL(Hardware-in-Loop) simulation platform. MATLAB/RTW is used to generate servo control algorithm code for the system from the model.The experimentation validates that the system has high stability,high precision in hardware circuit, and also could be monitored by PC, not only convenient but also achieving good result, I believe that it has an important role in the studying..