杆式风洞应变天平动态解耦-补偿

Dynamic decoupling-compensation for bar-shaped wind tunnel strain gauge balance

采用串行动态解耦-补偿网络实现多维力/力矩传感器的动态解耦-补偿,对已有的设计方法进行了改进。基于单通道加载实验数据,通过系统辨识方法设计网络的各个环节。具体针对六维杆式风洞应变天平,采用负阶跃单元加载法进行动态标定实验。对力矩加载实验数据进行预处理。采用OE模型描述串行动态解耦-补偿网络中的各个环节,通过基于预报误差的系统辨识方法确定其参数。对实验数据处理的结果表明,所设计的杆式风洞应变天平动态解耦-补偿网络能将杆式天平的维间动态耦合误差由高至88.85%降低至6%以内,主通道阶跃响应调节时间缩短至30 ms以内且超调量降低至5%以下,从而大幅度改善了杆式风洞应变天平的动态性能。

Serial dynamic decoupling-compensation network is adopted to implement the dynamic decoupling-compensation for multi-dimensional force/torque sensors,and the existing design method is improved.According to the experimental data of single channel loading,various links of the network are designed using system identification method.Specifically,the dynamic calibration experiments of six-dimensional bar-shaped wind tunnel strain gauge balance are performed by means of single channel loading method of negative-step.The experimental data of moment-loading are pre-processed.An output error model is used to describe various links of the serial dynamic decoupling-compensation network,and the predication-error based system identification method is utilized to determine their parameters.The processing results of the experimental data show that,the dynamic decoupling-compensation network designed for bar-shaped wind tunnel strain gauge balance can reduce dimensional coupling error from up to 88.85% to lower than 6%,and at the same time the adjusting time of step response of main channel is shortened to less than 30ms,the overshoot is also reduced to less than 5%.Therefore,the dynamic performance of bar-shaped wind tunnel strain gauge balance is improved significantly.