土工静力–动力液压三轴扭转多功能剪切仪数据采集处理系统

将从日本引进的新型土工静力–动力液压三轴扭转多功能剪切仪,配备了工业控制计算机和高精度模数转换接口板,以VC 6.0语言作为编程平台,利用现代计算机技术中的多线程编程技术和计算机绘图技术,实现三轴扭转试验仪的计算机数据采集处理系统,完成试验全过程的应力、应变和孔压等12种数据的实时监测、绘制实时动态曲线及实时数据采集处理,或形成数据文件供后期数据处理绘图。系统使用工控机内部高频时钟进行精确的系统采样定时,使试验仪采样周期的精确度达到微秒级,有效地保证数据采集精度改造后的试验仪数据采集处理系统不仅使试验数据的精确采集、处理过程全部自动化,且成功地完成对试验数据后续处理,如滞回圈等非规则曲线面积及莫尔圆公切线求解等一系列复杂计算。

SYSTEM OF COMPUTER DATA SAMPLING AND PROCESSING FOR SOIL STATIC-DYNAMIC UNIVERSAL TRIAXIAL AND TORSIONAL SHEAR APPARATUS

An industrial control computer with high precision A/D board is used to control the soil static-dynamic universal triaxial and tensional shear apparatus,which was introduced from Tokyo SeikenI,nc.J,apan in 2001.The data sampling and processing systems are developed using the multithreading and direct-draw technology on the program platform of VC 6.0 language.The system can perform the collection of all the real time experimental data,including the dynamic stress,strain,and pore pressure through the whole experimental process.The experimental data can be curved on the screen,or be processed in real time,or be saved in a data file on line for processing later.In order to ensure the precision of data sampling cycle,the intramural clock frequency of the computer is used to complete the controlling of sampling frequency.The precision can be set to microsecond.The system can make data processing and data sampling entirely automatic,and succeeds in performing a series of difficult subsequent calculations,such as the calculation of the area of the hysteresis loop irregular cure and the common tangent of Mohr circle.