The Study On The Universal Testing Machine Measurement And Control System Based On μC/OS-Ⅱ

The universal testing machine is one of the basic equipments of measuring the mechanical properties of materials, it has the wide range of applications. With the rapid development of the test machine technology and microelectronics technology, the old control system can't meet with the customer's requirements of testing machine. Therefore, it urgently requires a new generation of test machine control system of digital, intelligent, integration.In the universal testing machine real-time systems, because of the complex of the system, using the traditional before and after single-task control mechanism can not meet with the requirements of the real-time system's stability, maintainability and scalability, etc. Using the RTOS of the system, (Real-time multitasking operating system), because it use the preemptive kernel, all time-critical events can be handled effective and effective, it greatly improve the stability, reliability, dynamic response of the control system. Using the embedded real time operating system, it can control during the experiment in real-time system to improve the test quality. Therefore, using an embedded operating system in the control system has the advantages of compact structure,real-time monitoring, interrupt functions, high reliability, and low cost. It can significantly improve the level of the testing machine automation and intelligence.This paper introduces the work principle and the structure of control system about the testing machine.We select high-performance embedded operating systemμC/OS-Ⅱas operate system in the paper and give a porting advice in the testing machine study work,successful transplanted it into high-performance microprocessors ARM9,and applied to the testing machine software design. It selected the 32-bit ARM microprocessor with S3C2440A as the core master of the master controller of the control system. Select the model of the measurement part of the system, and achieve the circuit design of the sensor measurement interface channels. Data acquisition part use the ADS7805 analog-digital conversion chip of 16-bit high integration, it can meet with the requirements of precision and the numbers of the channels. The system use the fuzzy adaptive PID control strategy, according to fuzzy adaptive PID control algorithm to regulate the loading of the testing machine. It design the software of the system. According to the hydraulic serve system driven by hadraulic to complete the displacement, load and deformation dynamic and static measurements.