杆式风洞应变天平动态实验、建模与补偿

杆式应变天平是一种6维力传感器,在风洞实验中测量飞行器模型所受的各个方向的力和力矩.但是,其动态响应的超调量大,调节时间长,即动态性能差,无法满足动态测试的要求.为此,设计了应变天平动态标定装置,进行动态标定实验;基于实验数据建立应变天平的动态数学模型,给出性能指标;研制基于DSP的动态校正系统,实现对应变天平6路输出信号的动态补偿,以加快应变天平的动态响应.所建的模型和所研制的系统得到实验结果的验证.

Dynamic experiment, modeling and compensation of bar-shaped strain gauge balance for wind tunnel

Bar-shaped strain gauge balance is a kind of six-dimension force/moment sensor used to measure force and moment applied to an aircraft model in wind tunnel. But the overshoot of its dynamic response is large and the adjusting time is long, i.e. its dynamic performance is so poor that it cannot meet dynamic test requirements. Therefore a dynamic calibration setup is designed for the bar-shaped strain gauge balance, and dynamic calibration experiments are conducted in this paper. The dynamic mathematic models are built up according to the experimental data, and the dynamic performance indexes are presented. In order to speed up the dynamic response of the strain gauge balance, a real-time dynamic correction system is developed with DSP to achieve dynamic compensation for the six output signals of the strain gauge balance. The effectiveness of the models built and the compensation system developed in this paper are verified by experimental results.