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Unformatted text preview: ess loads induced by macrogeometrical errors will no longer be lowered by local accommodations of the contact surfaces. Any small variation of the initial geometry of the part will thus result in an early failure of the mechanical system. 3. BASIS OF THE GEOMETRICAL UNCERTAINTY MODEL Any variation of the geometry will influence the operating perfo rmance of the mechanical system. This variation can be defined by an uncertainty. It has been divided in three types by the ISO TC/213 standard [Srinivasan, 2001] : correlation uncertaint ies, specification uncertaint ies and measurement uncertaint ies. A model has already been proposed in previous papers to define the two last uncertainties [Sprauel et al., 2001], [Linares et al., 2003]. In this model, each surface is not only described by its mean parame ters, but its variations are defined by a random vector â (ai). Impact of Geometric Uncertainties
λi 229 ni Mi
Error bar of point Mi or Propagated uncertainty at point Mi a1 a0 x
Assumption: Uncertainty only on direction...
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This note was uploaded on 08/03/2010 for the course DD 1234 taught by Professor Zczxc during the Spring '10 term at Magnolia Bible.
- Spring '10
- The Land