Design of automatic control system of circular low speed wind tunnel and its measurement uncertainty evaluatio
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摘要: 为了满足矿用风速传感器的快速、准确、自动化检测和矿用气体传感器风速影响测试的需求，设计了一种环形低速风洞自动控制系统。该系统采用PLC为主控单元，根据风速与静压差的关系，通过对大气压力、空气温度、静压差的自动采集与计算，利用PID控制模块对变频器进行快速控制，最终通过控制电动机转速的变化，实现风速的自动输出。以检测GFY15矿用风速传感器为例，对测量过程中的皮托管、自动控制系统、风洞风速的不均匀性、不稳定性和流场紊流度等的不确定度进行了分析评定，结果表明，该自动控制系统能够满足矿用风速传感器自动化检测的需求。Abstract: In order to satisfy demands of rapid, accurate, automatic detection of mine-used wind speed sensor and wind speed impact test of mine-used gas sensor, an automatic control system of circular low speed wind tunnel was designed. The system uses PLC as main control unit, and adopts PID control module to control frequency converter fastly according to relationship between wind speed and static pressure difference and through automatic collection and calculation of atmospheric pressure, wind temperature, static pressure difference, so as to realize automatic output of wind speed by controlling change of rotate speed of motor. The uncertainty evaluation was analyzed including uniformity, stability and turbulence intensity of pitot tube, automatic control system, wind tunnel wind speed in the measuring process for detecting GFY15 mine-used wind speed sensor as example.The evaluation results show that the automatic control system can meet needs of automatic detection for mine-used wind speed sensor.
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