本文提出了一种基于Kriging代理模型的风洞应变天平静态校准方法。采用拉丁超立方设计的试验设计(DOE)方法选取校准加载点,以六分量组合加载技术为支撑,采用一阶回归基函数和EXP关联函数对校准数据构建Kriging模型,以电压信号增量和其他条件变量为自变量,通过Kriging模型对天平所受载荷进行预测。校准结果表明,与传统的OFAT(One Factor at A Time)校准方法相比,该方法具有相同的准度,加载点数量极大减少。将该方法应用于某矢量喷管推力测量天平的校准工作中,以通气流量和天平电压信号增量作为自变量,较好预测了喷管产生的推力,解决了传统校准方法难以克服的通气影响问题。
A new static calibration method for strain-gage balance used in wind tunnel test is introduced here.A design of experiments(DOE)method,Latin hypercube design,is used to choose samples.Kriging surrogate models constructed by using first order regression base function and EXP correlation function are mathematical models which predict loads by taking measured voltage increments and other factors as parameters,and six-component combining load calibration technique is used too.Compared with the traditional one factor at a time(OFAT)method,the new method not only has equivalent accuracy,but also remarkably reduces the number of samples.The new method is used in the calibration of some balance which is used to measure the thrust of a vector nozzle,and predicted thrust forces well.It figures out the interference of gas inflow which is hardly handled by traditional calibration method.