Study Of Photogrammetric Technique For Center Of Mass Determination

With the development of the aerospace industry, the mass characteristicparameters have become an important parameter to consider in aircraft design, anddirectly determine the flight parameters, stability and control accuracy requirements.By theoretical calculations and model tests to obtain accurate mass characteristicparameters of the aircraft, has become an important research direction in the field ofspace science and technology. Photogrammetric traditional applications in remotesensing, topographic survey, under the premise of technical means and missionrequirements are changing in recent years, photogrammetric technology in theconstruction, industrial and biomedical applications in the field of development hasalso made significant progress. With the characteristic of "as long as things can bephotographed can be measured", photogrammetry is used in a very wide variety ofapplications, producing a lot of research results. The aircraft centroid measurementby photogrammetry is a new research topic in the field of space science andtechnology. It may result some very good application prospects.Based on centroid measurement system using photogrammetric technologydesign, this paper focuses on close-range photogrammetric centroid measurementsystem modeling, mathematical modeling of the measured target and the centroidalgorithm analysis, close-range photogrammetric centroid measurement systemexperiment were studied. The main contents are as follows:In this paper, close-range photogrammetric centroid measurement systemmodeling has been completed. Photogrammetric system perspective transformationmodel has been identified. The problem of photogrammetric system cameracalibration has been solved. The design of the measuring sensor and the featuremarking points has been completed. The center of the feature marking pointspositioning method has been determined.In this paper, the mathematical modeling of the measured target and centroidalgorithm analysis has been completed. According to task requirements, targetmodel has been established. The position and orientation of the target solutionmodel has been determined, and the analysis of the algorithm has been completed.The plumb line of the model has been fit by the least squares algorithm. Thecentroid of the model algorithm has been obtained.In this paper, close-range photogrammetric centroid measurement system testverification and data processing have been completed. According to the actual needsof the task, the test targets have been divided into symmetrical shape model andasymmetric shape model. By using multi-point weighing method and computer image method, centroid measurement as comparison test has been completed, thetest results as reference value has been relatively analyzed. Close-rangephotogrammetric centroid measurement test has been completed; the test data hasbeen processed. The effectiveness of the close-range photogrammetric centroidmeasurement system has been demonstrated.