Research On The Model Reconstruction Technology Of Propeller Blade Of UAV Based On Reverse Engineering

UAV propeller, as an important part of UAV power plant, is to ensure the safety of UAV, but it is also strictly controlled and blocked by UAV manufacturers as an important core technology. The shape of propeller blade was free curved surface, and it is difficult to obtain a three-dimensional CAD model of the blade by the forward design approach. Therefore, by the use of reverse engineering techniques, this article is to obtain accurate surface models of propeller blades, and it has a great practical significance for shorting the development cycle of a new reprocessing model.This paper briefly describes the definition and composition of the system and the basic steps of reverse engineering, and points out the important role of reverse engineering in engineering practice. Through the introduction of the overseas and domestic current technology of the research status of reverse engineering, put forward future research field of reverse engineering which scholars should focus on. Study the method and process of the 3D data acquisition of the propeller blade. Through the introduction of several common methods of measurement, this paper summarizes the advantages and disadvantages of each method, and finally according to the existing conditions of the laboratory and the characteristics of the propeller blade, the appropriate data measurement method is chosen. Through research and analysis, points out matters which need attention by use of the measurement method in data collection, and forecasts the possible errors in the measurement, which can effectively guide the process of actually measuring data. Do the preparatory work before the acquisition of the propeller blade surface point cloud data, finally complete data collection on the surface of propeller blade with high quality. Point cloud data processing technologies of reverse engineering are discussed in detail, including the multi-view cloud data alignment technology, point cloud data preprocessing technology, data segmentation technology. Through the further study for methods and principles of point cloud preprocessing, sum up the appropriate processing method of propeller blades for point cloud data. According to the theory of the previous analysis which has been carried out, and combined with Geomagic Studio and Imageware software, this article has completed the upper and lower surfaces of the point cloud alignment and hole patching, point cloud coordinate alignment, outlier processing point cloud data, point cloud smooth data, streamlining, and the steps of splitting the point cloud data, and finally gets the better propeller blade point cloud data. This paper focuses on the theory and method of surface reconstruction, and points out that the primary means to evaluate the accuracy of the model error, and emphatically introduces the methods of checking out the fairness of the model. At last, the Imageware software is used to reconstruct the surface of propeller blade according to the "point- line- Surface" method, which has been described in the paper. Through a series of evaluation of the reconstructed surface, it can be known that the propeller blades which this paper has reconstructed can achieve the expected precision and quality requirements, and meet the requirements of engineering practice.