Study Of Multi-channel Measurement And Control System For Test Machine On Linux

Testing machine is to measure the mechanical properties of metallic materials,non-metallic materials, machinery parts, engineering structures, process performance, internaldefects and verification of dynamic unbalance of rotating parts precision instrument undervarious conditions, environments. In the process of researching and explorering of newmaterials, new processes, new technologies and new structures, the test machine is aindispensable test equipment.With the development of the national economy, the functions of test machine it’s inincreasingly demanding, testing machine and control system can not simply rely on hardwareto complete the experimental task, the new testing machine and control system are required tohave their own human-computer interaction and real-time monitoring capabilities, and can usethe network as an information transfer medium, therefore, it requires a complex combinationof hardware and software.The research object of this topic is electro-hydraulic servo dynamic testing machine. Ituses embedded technology to complete the data acquisition of sensor and loading control ontest machine, and meets the requirements of test machine for real-time, test data processing,real-time curve drawing, automatic control, etc., the main research work is as follows:1、This paper outlined the use of testing machine, dynamic development at home andabroad, describingthe characteristics and application of the embedded Linux operating system,and the classification of embedded processors.2、It described the working principle of Multi-channel Measurement and Control Systemfor Test Machine, designed the overall structure of the system, and described some featuresmeasurement and part of the functional components.3、It described the building of a platform of embedded control systems for dataacquisition and control function based on ARM microprocessor S3C2440, the hardwaresection includes the selection of a processor, principle analyzing and circuit designing of themain function modules, software section includes building embedded Linux system platform,establishing cross-compiler environment, transplanting bootloader (U-boot) and tailoring and configurating of Linux kernel, making linux root file system, so easy to upgrade andcut.software hardware.4、Studied the control method of the test machine control system to improve the loadingcontrol accuracy and real-time of the testing machine. Researched PID control strategy basedon fuzzy control and made the MATLAB simulation.5、Developed the host machine of test machine control system, including development ofa PC interface by using C++programming language, communication of upper and lowermachine by serial and network.