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Unformatted text preview: bed with an edge-line constraint. The edge-line constraints are expressed as two vertex-line constrains, one for each vertex of the edge. 3. arc-line constraint (1): this constraint is used to describe distance or contact relationships between an arc and an edge, such as the contact between parts P4 and P5 in Figure 1. An arc-line constraint entails a linear equation defining the distance of the arc center to the line supporting the edge as the required distance plus the arc radius. In our tolerancing model [Ostrovsky-Berman, 2004], circular arc segments are specified by the two endpoint vertices v1, v2, and either the radius r or the arc angle α, all of which are functions of the variational parameters. 4. arc-arc constraint (1): this constraint is used to describe contacts between two arcs, which are common in mechanisms with rotating parts, such as the contact between parts P3 and P4 in Figure 1. 5. conditional edge-edge constraint (1): this constraint is used to specify contacts between nominal...
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- Spring '10
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