摘要
姿态角动态测量精度对风洞试验至关重要,姿态角的视频测量技术因对风洞模型设计无要求,受到国内外风洞试验机构的青睐。为此,开展迎角视频测量的不确定度研究,以评价其测量数据的精度,给出其系统误差的补偿方法,即在风洞试验结束后,采用高一个等级计量标准的角度静态测量仪器测量此时的模型姿态角,用该测量结果替换视频测量估计值,可消除视频测量方法的系统测量误差,并在2 m超声速暂冲式风洞进行试验。3组迎角视频实测数据表明:各阶梯迎角测量数据的标准差在0.002 2°～0.009 4°之间,迎角实测估计值的标准不确定度≤0.003°,故姿态角视频测量系统的迎角精密度≤0.009 4°;同时,此方法既不破坏模型的外形,又不改变模型的刚度与强度,具有实用价值。
The dynamic measure accuracy of modal attitude angle is critical in wind tunnel tests, and video measurement technique of attitude angle becomes a research focus for wind tunnel institutions at home and abroad, because it has no special requirement for model design. Therefore, the video measurement uncertainty of model＇s attitude is investigated, and a compensation method of its systematic error is also presented by this paper to evaluate the video measurement accuracy of attitude angle in wind tunnel tests. The video measurement estimating value is replaced by the value of a higher accuracy instrument measuring the same static angular after wind tunnel test, so the system error can be eliminated, and the three engineering experiments are investigated in 2 meters supersonic wind tunnel. It has been demonstrated that the standard deviation of the measured data on each step ranges from 0.002 2°to 0.009 4°, the standard uncertainty of evaluated attack angle is ≤0.003°, as a result, the precision of this video measurement system developed by this paper is≤0.009 4°, in addition it neither destroys aerodynamic shape, nor changes the stiffness and intensity of model, so it is useful and effectively.
出处
《兵工自动化》
2013年第2期71-74,共4页
Ordnance Industry Automation
基金
国家自然科学基金(51075385)
关键词
迎角
视频测量
风洞试验
不确定度
attack angle
video measurement
wind tunnel test
uncertainty
