414 lry 2s2 rx1s2 1414 ry 2s2 lry1s2 ry1s2 25lrx1s2

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Unformatted text preview: ters (LHP) are constrained by the conditions of contact, which are conditions of non-penetration workpiece/part-holder (GapHP > 0). This thus obliges us to envisage 2 solving procedures: • Slipping contact. We have to apply a positioning function. This function is generally defined by the displacement of a point of the workpiece along a direction appropriated to the contact that has to be maintained. The displacement function has to be maximized, respecting the non-penetration conditions between workpiece and part-holder. These non-penetration conditions are applied at all potential contact points of the boundary of the surface. In some cases, that implies to discretize the edges of the contact zone. In some cases, a simple numerical solution exists. For example, a primary plane/plane connection implies that the link parameters have to be set to zero: ⎧0 ⎪ THkSj,Pi = ⎨ 0 ⎪ Urz kSj ⎩ Utx kSj ⎫ ⎪ Uty kSj ⎬ 0 ⎪Point,Base ⎭ • Floating contact. The parameters of the floating...
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