Data Visualization Research On Geometry Dimension Of Thin Wall Revolving Body

A kind of thin wall revolving body is a key part in a high speed aircraft. Its machining precision could directly affect the stability of high speed aircrafts in flight. Measuring geometry parameters such as profile and thickness precisely is a effective instrument to test the machining precision of the thin wall revolving body. The thin wall revolving body is a kind of thin-wall part with complex three-dimension surface and large ratio of depth and radius. But the demand of measuring precise for the geometry parameters is very strict (0.001mm level). Researches on the high performance thin wall revolving body could not be addressed by existing measuring equipments and techniques in accuracy and efficiency. So our research team developed a high precision and high efficiency thin wall revolving body geometry dimension measuring facility. Math base, software programs and technology to visualize the data got by the facility are all researched in this paper.Considering the geometry characters of the thin wall revolving body and measuring precision demand on profile and thickness, measuring principle and the total design scheme that installing once, measuring twice and three axis linkage are introduced.Mathematic algorithms that visualize data into curves and surfaces are summed up and analyzed. Mathematics that will be used in data visualization such as NURBS surface re-construction, cubic spline fitting and interpolation arithmetic are expressed and analyzed in details. All prepares for the visualization of the thin wall revolving body's measuring data.NURBS surface re-construction algorithm which is used to visualize profiles is put forward. According to the profile data measured by this facility, NURBS surface re-construction algorithm is used. And vector calculations of reference points and the constructions of boundary conditions are primarily researched in this paper. The NURBS algorithm which express the profile of thin wall revolving body is also givenThe thickness data visualization technology which is basing on curve fitting of cubic spline and interpolation algorithm is researched. For the data got by regional measuring mode in thickness measure, cubic spline is used to measure generatrix. And not only is interpolation algorithm used to compute thickness data and the coordinates of reseau points in measuring region but also to construct the surface of thickness measuring region.Measuring data visualization software system is developed. Data pretreatment, the profile visualization of the thin wall revolving body, three-dimension error nephogram of thickness and two-dimension section nephogram are all realized basing on the visual technology of OpenGL on VC++ 6.0 development platform.The thin wall revolving body geometry dimension measuring facility which installs this data visualization system has been delivered to some war industry department. The difficult problem of thin wall revolving body geometry precise measurement is solved very well. Application result indicates that this data visualization software could display vividly besides its friendly human-machine interface, accurate output and stability.