CAJ | 학술논문

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0.0022°~0.0094°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≤0.0094°;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.
자태각동태측량정도대풍동시험지관중요,자태각적시빈측량기술인대풍동모형설계무요구,수도국내외풍동시험궤구적청래.위차,개전영각시빈측량적불학정도연구,이평개기측량수거적정도,급출기계통오차적보상방법,즉재풍동시험결속후,채용고일개등급계량표준적각도정태측량의기측량차시적모형자태각,용해측량결과체환시빈측량고계치,가소제시빈측량방법적계통측량오차,병재2 m초성속잠충식풍동진행시험.3조영각시빈실측수거표명:각계제영각측량수거적표준차재0.0022°~0.0094°지간,영각실측고계치적표준불학정도≤0.003°,고자태각시빈측량계통적영각정밀도≤0.0094°;동시,차방법기불파배모형적외형,우불개변모형적강도여강도,구유실용개치.
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.