LabVIEW中DAQ数据采集系统设计

摘要

针对模拟火箭喷管堵盖打开试验难模拟、难控制、难测量等特点，采用LabVIEW软件中DAQ数据采集系统。考虑到模拟火箭喷管堵盖打开时的压力上升速率，且要求压力上升速率可调可测，提出基于NI-cDAQ9174机箱、数字量NI9421 NI9472模块和模拟量NI9221 NI9227模块的程序平台。开发了一套包含数字量组合与模拟量混合的压力信号采集、靶线电压记录的数据采集系统，最终实现了模拟火箭喷管堵盖打开时压力数据的采集与靶线电压信号的记录。%The open test for rocket nozzle closure is difficult to simulate, control and measure, by using DAQ data acquisition module in LabVIEW software, the pressure rising rate can be easily simulated when the closure is opened, and this rising rate can be adjustable and measured. Based on platform of NI-cDAQ9174 chassis, digital modules NI9421, NI9472 and analog modules NI9221, NI9227, the data acquisition system including pressure signal acquisition with digital combination and analog combination, and target line voltage record has been developed, to implement pressure data acquisition and target voltage signal record when the closure of rocket nozzle is opened.