CAJ | 학술논문

扫描角和转速是某伞一弹系统风洞试验中要求必须测量的重要技术参数.对伞-弹系统扫描角和转速进行定量动态测量是试验中必不可少的技术环节.投影图像法测量的原理就是利用一定截面积的两路正交平行光源,将旋转弹体分别投影到两个正交的投影屏上,利用两套高速CCD成像系统,将两路弹体投影图像同步采集并实时记录下来,试验结束后利用图像处理软件自动计算出两路图像序列角度分量,按照时序合成出每一时刻弹体的空间扫描角,并根据序列角度分量,计算出弹体的瞬时转速和全周期平均转速.利用该测量方法,在西安某所立式风洞中成功对多个型号的伞-弹旋转弹体空间扫描角和弹体转速进行了测量,取得了良好的测量结果.旋转体的静态角度测量精度为0. 18°,动态扫描角测量精度控制在0. 25°以内.作者从扫描角测量原理和方法人手,着重介绍该投影图像处理测量系统的设计和实际运用,给出了某伞-弹系统风洞试验的测量结果.
소묘각화전속시모산일탄계통풍동시험중요구필수측량적중요기술삼수.대산-탄계통소묘각화전속진행정량동태측량시시험중필불가소적기술배절.투영도상법측량적원리취시이용일정절면적적량로정교평행광원,장선전탄체분별투영도량개정교적투영병상,이용량투고속CCD성상계통,장량로탄체투영도상동보채집병실시기록하래,시험결속후이용도상처리연건자동계산출량로도상서렬각도분량,안조시서합성출매일시각탄체적공간소묘각,병근거서렬각도분량,계산출탄체적순시전속화전주기평균전속.이용해측량방법,재서안모소입식풍동중성공대다개형호적산-탄선전탄체공간소묘각화탄체전속진행료측량,취득료량호적측량결과.선전체적정태각도측량정도위0. 18°,동태소묘각측량정도공제재0. 25°이내.작자종소묘각측량원리화방법인수,착중개소해투영도상처리측량계통적설계화실제운용,급출료모산-탄계통풍동시험적측량결과.
Sweeping angle and rotating speed are important parameters of a parachute-ball ro-tator in wind tunnel measurement experiment as well as a necessary quantitative dynamic meas-urement test. The principle of the orthogonal projection method is to use a two-way orthogonal parallel light source of a given cross-section area to project the rotator into two orthogonal screens, two high-speed cameras synchronically record the projecting images. The image process-ing software automatically calculates the angularity of two-way image sequence, sequentially pho-tographs every moment's spatial sweep angle, and according to the sequential angularity, the in-stantaneous rotating speed and average rotating speed of all cycle can be calculated. Applying the orthogonal projection method, we have successfully measured different types of parachute-ball ro-tator in a vertical wind tunnel in Xi'an and obtained good results. The static angle measurement accuracy is 0.18°, the dynamic sweeping angle measurement accuracy is limited in 0.25°. This pa-per describes the principle and structure of the orthogonal projection method as well as the appli-cation of the image processing system, and the wind tunnel measurement results were also given.