摘要
该文介绍了基于微机通讯的数字式应变仪的研究与设计。针对微弱信号在硬件选择上和软件方面采用相应方法来提高精度和抗干扰能力。采用RS232串行方式与上位机之间通讯,并且控制数据和实时数据采用不同种通讯协议来进行传输。
本系统以MCS-51系列单片机兼容的单片机AT89e52为核心,由中央处理模块、信号放大模块、数据采集模块、人机接口模块和电源模块五部分构成。软件由上位机软件和下位机软件两部分构成:下位机软件采用模块化编程思想,选择执行效率最高的汇编语言编写系统软件。
本测试仪器具有测试静应变量、动应变量、动荷系数和频率等功能。经实验验证,本仪器及配套的上位机应用软件可以适应等强度梁冲击动应变测试测试的需求,同时通过设置参数还可以用于其它动态信号的测试。
Research on the dynamic strain testing instrument based on micro-computer communication is introduced. In hardware and software we adopt different measure to improve precision and ability of anti-jamming. The instrument communicate with upper compute in asynchronism serial communication. The relevant communication protocol are used for control-data and time-data.
AT89C52 compatible with MCS-51 is the center of the dynamic strain impact testing instrument. The system include center process unit, signal amplificatory modules, signal collecting modules, monitor interface modules and power supply modules. The system software is composed of down-computer software and upper- computer software. Because of the high executing efficiency of the assemble language, it is used to write modularized program for the down-computer software
This testing instrument has the function of testing static strain, dynamic strain, dynamic load-coefficient, frequency and so on. The apparatus and the upper computer application may fit to the needs of dynamic strain impact testing apparatus of beam with equal strength and may be used to other dynamic testing by setting different parameters.
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