2016
DOI: 10.1007/s00170-016-8899-3
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Evaluation of the shape deviation of non rigid parts from optical measurements

Abstract: Résumé This paper deals with an approach to identify geometrical deviations of flexible parts from optical measurements. Each step of the approach defines a specific issue which we try to respond to. The problem of measurement uncertainties is solved using an original filtering method, which permits to only consider a few number of points. These points are registered on a mesh of the CAD model of the constrained geometry. The shape resulting from deflection can be identified through the finite-element simulati… Show more

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Cited by 13 publications
(12 citation statements)
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“…Typically, these methods try to find a nonrigid registration that minimizes the Euclidian distance between the acquisition data (or SCAN) and the nominal CAD while respecting some criteria related to the intrinsic (dimensional & shape) properties of the part. The nonrigid point set registration performed within a flexible registration method can be based on a Finite Element Analysis (FEA) [3][4][5][6][7][8][9][10][11][12][13][14] or based on a probability density estimation [16][17]. As a result, a flexible registration operation is either FEA-based or probabilistic.…”
Section: ) Flexible Registration (With Complementary Defect Identifimentioning
confidence: 99%
“…Typically, these methods try to find a nonrigid registration that minimizes the Euclidian distance between the acquisition data (or SCAN) and the nominal CAD while respecting some criteria related to the intrinsic (dimensional & shape) properties of the part. The nonrigid point set registration performed within a flexible registration method can be based on a Finite Element Analysis (FEA) [3][4][5][6][7][8][9][10][11][12][13][14] or based on a probability density estimation [16][17]. As a result, a flexible registration operation is either FEA-based or probabilistic.…”
Section: ) Flexible Registration (With Complementary Defect Identifimentioning
confidence: 99%
“…In order to homogenize both point clouds, to each node of the nominal mesh, p i , a corresponding mean point m i , is computed on the point cloud considering a small neighborhood defined by a cylinder at the vicinity of the node. Furthermore, as the free-state will be the basis for FE simulations [11], it is represented by a finite element mesh. For this purpose, our approach consists in moving p i along its normal vector n i ⃗⃗ by a distance equal to the projection of the distance between the node p i and its mean point m i onto n i ⃗⃗ , minus the calculated displacement at the node, D i , with D i the component of D free conf for each node of the mesh.…”
Section: Free-state Shape Computationmentioning
confidence: 99%
“…To perform accurate assembly simulations whatever the configuration, the intrinsic geometry of components, called the free-state shape, must be known. The free-state is the shape a component should have in absence of loads [11,12]. The free-state turns out to be difficult to identify when flexible parts are concerned, which is the case for aeronautical assembly structures, gravity loads and part fixturing indeed induce part deformations.…”
Section: Introductionmentioning
confidence: 99%
“…Even though these documents only deal with simple geometries, the description of shape defects by eigenmodes can be applied for any geometric complexity of the surface of interest, and any dimension by using finite element solutions. This approach was used, for example, to evaluate defects of large flexible parts [16].…”
Section: Introductionmentioning
confidence: 99%