基于NI9237模块的旋转振荡耦合运动载荷测量方法  

Measurement Method of Rotating Oscillation Coupling Motion Load Based on NI9237 Module

作　　者：李春霞 宋晋[1] 蒋永[1] LI Chunxia;SONG Jin;JIANG Yong(Low Speed Aerodynamics Institute of China Aerodynamics Research and Development Center,Mianyang Sichuan 621000,China)

机构地区：[1]中国空气动力研究与发展中心低速空气动力研究所,四川绵阳621000

出　　处：《自动化与仪器仪表》2023年第4期58-61,共4页Automation & Instrumentation

摘　　要：在风洞中进行旋转天平试验,可以获取飞行器绕速度矢量轴稳定旋转时的气动特性,是分析预测飞机尾旋及尾旋改出特性的主要数据源。为了研究飞行器在旋转流场下单自由度振荡运动中的空气动力学问题,需开展旋转振荡耦合试验,由于旋转天平试验装置的微弱数据信号与运动控制电机供电在通过滑环引电器时存在强弱电干扰现象,影响测量数据精度。因此,设计并实现了一套基于NI9237模块的前端数据采集系统,该系统可给天平提供高精度电压激励,并将采集的数据通过数字信号传回控制计算机端,有效避免了电磁干扰,同时使用色环电阻搭建半桥电路配置振动运动姿态电位计,解决了同步采集天平应变信号及振荡姿态信息的问题。该系统已成功应用于试验,试验结果表明,该系统功能完善,采集数据准确,取得了良好的试验效果。The rotating balance test in the wind tunnel can obtain the aerodynamic characteristics of the aircraft when it rotates stably around the speed vector axis.It is the main data source for analyzing and predicting the tail spin and tail spin modification characteristics of aircraft.In order to study the aerodynamics of aircraft in single degree of freedom oscillatory motion in rotating flow field,it is necessary to carry out rotating oscillation coupling test.Due to the weak data signal of the rotating balance test device and the power supply of the motion control motor,there is strong and weak electric interference when passing through the slip ring inductor,which affects the measurement accuracy.Therefore,a set of front-end data acquisition system based on NI9237 module is designed and implemented.The system can provide high-precision voltage excitation to the balance,and send the collected data back to the control computer through digital signal,which can effectively avoid electromagnetic interference.The color ring resistance is used to build the vibration motion attitude potentiometer,which solves the problem of synchronously collecting the balance strain signal oscillation attitude information.The system has been successfully applied to the test.The test results show that the system has perfect function,which can collect accuracy data and help obtaining good test results.

关 键 词：NI9237 旋转振荡 数据采集 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]