A practical sampling method for profile measurement of complex blades |
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| Affiliation: | 1. Department of Mathematics and Statistics, Washington State University Vancouver, Vancouver, WA 98686, USA;2. Intel Inc., Hillsboro, OR 97124, USA;3. USDA Forest Service, Pacific Northwest Research Station, Portland, OR 97204, USA;1. Bal?kesir University, Necatibey Faculty of Education, Department of Physics, 10100 Bal?kesir, Turkey;2. Bal?kesir University, Balikesir Vocational High School, 10100 Bal?kesir, Turkey;3. Bursa Orhangazi University, Department of Electrical-Electronics Engineering, 16350 Bursa, Turkey;4. Amasya University, Department of Electrical-Electronics Engineering, 05100 Amasya, Turkey;5. At?l?m University, Faculty of Engineering, Department of Mechatronics Engineering, 06830 Ankara, Turkey;1. University of Belgrade, Faculty of Mechanical Engineering, Department for Production Engineering, Kraljice Marije 16, 11120 Belgrade 35 PF 34, Serbia;2. Vienna University of Technology, Faculty of Mechanical and Industrial Engineering, Department for Interchangeable Manufacturing and Industrial Metrology, 1060 Wien, Getreidemarkt 9/3113, BA09, Austria;3. Metropolitan University, Tadeusa Koscuska 63, 11000 Belgrade, Serbia |
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| Abstract: | Blade is one of the most important parts in turbine machinery. The complex geometry of blades not only makes them difficult to fabricate, but also leads them difficult to inspect. Typically, the surface of blades is measured by using coordinate measuring machine (CMM). Since the measurement time and cost increase proportionally as the increase of measurement points, it is essential to sample measurement points which can represent entire blade with sufficient confidence and accuracy. In order to achieve a certain allowable deviation with a suitable set of points, a practical sampling method for surface measurement of blades was studied. Firstly, the leading edge curve and trailing edge curve were supposed to represent the twisted and bend information of blades. A sampling method based on maximum chordal deviation for leading edge curve and trailing edge curve was researched. Further, a fusion approach for sampling points on both edge curves, which determine the cross-sections, was proposed. Secondly, the inspection points sampling method for sectional curves were investigated. Finally, two simulation and one experimental examples were used to demonstrate the sampling methodology. The results indicated that the approach of this study can ensure the measurement precision at high curvature potion by measuring a small number of points. |
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| Keywords: | Profile measurement Blade Adaptive sampling Chordal deviation Sectional curves Coordinate measurement machine (CMM) |
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