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The Research of Sculpture Surface Point Distribution Strategy and Error Evaluation Method

Author: ZhangSong
Tutor: HeGaiYun
School: Tianjin University
Course: Mechanical Manufacturing and Automation
Keywords: Complex surface Cloth -point strategy Shape and position errors The method of least squares Projection Method
CLC: TH161
Type: Master's thesis
Year: 2010
Downloads: 88
Quote: 2
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Abstract


With the rapid development of modern manufacturing , it is constructed of parts contours diversified requirements , parts surface quality requirements have been increased . Processing quality driving Geometrical detection technology development . Cloth point method and error assessment algorithm to improve the detection quality and efficiency has a direct impact . The main point strategy and error evaluation of complex surface of the cloth . First complex surface measurement points distributed problem , a curve, surface distribution method based on distance . According to the curve - Surface relationship , in the basis of research curve cloth point method , be extended to resolve the sampling problem surfaces . According to the processing requirements of the curve initial measurement point split refinement iterations choice of site , and then layer by layer , adaptive distribution curve . Then apply the initial grid points with a combination of distance - based iterative selected point sampling method , the adaptive distribution of surface points . This method allows the measurement point can be carried out with the surface curvature changes the density distribution , the topology information of the effective reflection surfaces . Second, the error evaluation of complex surface . Built using the method of least squares error evaluation of the objective function . By aligning the local coordinate system and construct the constraint conditions, to optimize the initial condition , and then apply the iterative closest point (ICP) algorithm , to affect the surface displacement and rotation of the six parameter optimized , thereby completing the complex curved surface profile error assessment work . Molding theory , according to the base case processing and surface projection transformation coordinates for gentle surface slope and curvature change , flatness minimum zone method for solving method . Finally, the simulation experiments of the above algorithm validation . Using cloth point method based on the distance from the curved surfaces simulation point of Adaptive cloth , and to simulate the real error by adding points , and then apply the ICP method and the projection method with respect to their error evaluation . The experiments show that the proposed method is effective and practical .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Machinery Manufacturing Technology > Theory of machining accuracy
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