Abstract: Traditional (2-D) technical drawings are still used by people involved in the production chain to manufacture parts to exact specifications. Of the many processes involved in the production of a good technical drawing, dimensioning is one of the most tedious, time-consuming and error prone. Most state of the art CAD systems generate 2-D technical drawings from 3-D models automatically. They also place dimensions automatically, however, in a rather primitive way. In practice, the automatically generated dimensions are the starting point for a manual improvement of the dimension positions. In this paper, we present fast and efficient techniques for the automatic placement of dimensions to 2-D technical drawing, which we have implemented and incorporated into a commercial CAD system. The dimensions produced follow the basic drawing standards and do not produce redundant dimensions.

• Publication Date: 10-Dec-2017
• DOI: 10.15224/978-1-63248-140-5-41
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Abstract: In this paper some initial results concerning the evolution of flame propagation of CNG as a fuel in 4-valve engines with tilted valves were presented. Results were obtained by dint of multidimensional modeling of reactive flows in arbitrary geometry with moving boundaries. During induction fluid flow pattern was characterized with organized tumble motion followed by small but clearly legible deterioration in the vicinity of BDC. During compression the fluid flow pattern is entirely three-dimensional and fully controlled by vortex motion located in the central part of the chamber. The effect of turbulence model variation on flame propagation was tackled as well. Namely, some results obtained with eddy-viscosity model i.e. standard k-ε model were compared with results obtained with k-ξ-f model of turbulence in domain of 4-valve engine in-cylinder flow. Some interesting results emerged rendering impetus for further quest in the near future. In the case of combustion all differences ens

• Publication Date: 10-Dec-2017
• DOI: 10.15224/978-1-63248-140-5-42
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• Downloads: 0