Download AASHTO guide for design of pavement structures, 1993 by American Association of State Highway and Transportation PDF

By American Association of State Highway and Transportation Officials

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7 "/ $! /" && 3 7! " && / AJ $ . / 7 / . "O @ :" 3/ . 7 Dependence and Independence of Variations of a Geometric Object P. Serré*, A. Rivière*, A. com Abstract: The general objective of this paper is to analyse the dependency relations that may exist between several specifications of a geometric object. This object will be modelled on the basis of the TTRS concept and vector modelling synthesised by the metric tensor of a sheaf of vectors. The first problem that we propose to solve therefore is the formal expression of these relations.

In declarative geometry, a complex geometric object is perceived as a system of specifications between geometric objects. Each object is potentially in relation with all the others (the complexity is O n 2 ). , 2001] and in a PhD [Duong, 2003], and the tensor representation will enable the complexity to be reduced to O ( n ) , that is to say, almost to the level of analytic geometry, at the same time explicitly preserving the relations between objects. Historically speaking, the inventor of the application of tensor computation to technology was G.

Today, dimensional and geometric tolerances are expressed with graphical symbols on a 2D drawing. These symbols are defined in different national and international standards. The main existing ISO standards for tolerancing isolated parts, ISO 8015 (1985), ISO 1101(1983), ISO 2692 (1988) and ISO 5459(1981) are not recent and have a lot of gaps and contradictions [Bennich, 1993]. Also, these standards do not cover the need to express geometric requirements on assembly and does not consider statistical aspects.

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