某型螺旋桨拉力确定试飞参数不确定度分配及验证

Parameter uncertainty distribution and verification for a certain propeller thrust determination flight test

对依据某型螺旋桨风洞试验数据所建立的螺旋桨拉力计算模型的准确性进行了验证,利用模型开展了参数的敏感性分析工作。针对以往试飞中存在的问题,提出了一种螺旋桨拉力确定试飞参数不确定度分配方法,该方法能够反映不同参数对计算结果的影响程度,并利用蒙特卡洛法对分配方法进行了验证。结果表明,由该分配方法计算所得的拉力计算的不确定度可满足预定要求,分配方法是可靠的。

The accuracy of a propeller thrust determining method is validated by the wind tunnel data in this paper. The parameter sensitivity has been analyzed based on such foundation. Based on the problem frequently encountered in flight test,the uncertainty distribution method has been proposed,and the calculating formula has been provided,which could reasonably reflect the influencing degree of different parameters. The method has been validated using Monte Carlo method,and it is shown that the uncertainty of calculated thrust could satisfy actual requirement based on this method,and the method is reliable.