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Unformatted text preview: can be computed whereas it is not representative of the whole generated surface. 3. PROPOSED MODEL 3.1. Representation of the part The signature corresponds to the distribution of the real points of the machined surface around to the nominal profile. It represents, in consequence, a statistical estimation of the point population and on only has a sense if the population is built randomly. This is not the case with a classical Z-Map representation were all the z-axes are defined by a grid of constant step along the x and y directions. Such grid construction may result in intensifying the contribution of some characteristically subgroups of the surface point’s population and therefore introduce a statistical bias [Weckenmann et al., 1995]. In first approach, increasing the number of z-axis can easily help to reduce this bias. But in fact, it is not a valuable solution for two reasons. First, it will never totally remove it and second it will dramatically increase the calculation cost. For as much, the...
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- Spring '10
- The Land