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随着计算机技术的发展 ,基于标准个人计算机平台的虚拟仪器技术正成为测试与控制领域的重要应用工具。结合薄层干燥实验要求 ,给出了一种增量式 PID控制算法 ,根据此控制算法和脉宽调制法 ,采用虚拟仪器技术 L ab VIEW软件开发平台 ,开发了一种实用的基于虚拟仪器技术的薄层干燥实验系统。对实验台干燥温度实行自动控制 ,控制精度为± 0 .5℃ ;通过间歇自动称量样品的质量 ,实现对样品水分、降水率等的自动监测 ;热风温度、样品质量、样品水分、样品降水率、尾气温度、尾气湿度等以图表实时显示 ,并以电子表格存储。实验表明 ,该系统具有自动化程度高、实验操作简单、测试项目多、工作界面友好、数据处理分析功能强 ,测试精度高等优点。
With the development of computer technology, the virtual instrument technology based on the standard personal computer platform is becoming an important application tool in the field of testing and control. According to the experimental requirements of thin layer drying, an incremental PID control algorithm is given. According to this control algorithm and pulse width modulation method, a virtual instrument technology L ab VIEW software development platform is used to develop a practical virtual instrument technology Thin layer drying experimental system. Automatic control of the drying temperature of the test bed, the control accuracy of ± 0 .5 ℃; by intermittent automatic weighing sample quality, to achieve automatic monitoring of sample moisture, precipitation rate; hot air temperature, sample quality, sample moisture, sample precipitation Rate, exhaust temperature, exhaust humidity and other charts in real time, and stored in a spreadsheet. Experiments show that the system has the advantages of high degree of automation, simple experimental operation, many test items, friendly working interface, strong data processing and analysis functions, and high testing accuracy.