脉冲风洞天平动态标定加载系统设计

摘要

Since the short effective measurement time and the large impulsive load for the impulse combustion testing in wind tunnel,model system will vibrate intensively during the experiment,which will reduce the accuracy of force testing.In order to provide the dynamic forces which the experiment needs,we proposed a new dynamic force measurement system.The mechanical part was consist of a set of motor,leading screws and screw nuts.Meanwhile the control part was based on embedded soft PLC.The EtherCAT terminal boxes which are connected to the controller are used for detecting the signals from sensors and driving motors.The modular integrated hardware making the system more compact.Experiment shows that the system meet the requirement of wind-tunnel balance.%由于脉冲风洞试验时间短,冲击载荷大,试验过程有强烈振动,影响天平的测力精度,因此,需要对天平模型进行动态标定.针对风洞天平的动态标定所需要的高频率、重载荷稳定的动态力,设计了一套动态力加载系统.机械结构运用电动机带动丝杠副的结构设计,控制部分采取嵌入式PC,在系统内虚拟出软PLC.传感器检测模块和电动机驱动模块等通过EtherCAT总线与软PLC通讯,实现硬件的模块化集成.经试验测试,该系统能满足风洞天平的测试要求.