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Shape Optimization of the Cross Section for a Non-circular Spring Wire of Valve Springs for an Automotive Engine  

Kim, Do-Joong (Department of Mechanical Engineering, University of Ulsan)
Kim, Young-Kyung (Graduate School of Mechanical Engineering, University of Ulsan)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.19, no.2, 2011 , pp. 117-124 More about this Journal
Abstract
Valve springs with non-circular cross-section are widely used in automotive engines. Because of the reduced height, the oval cross-section provides some merits in its install height and stress distribution. This paper introduces a new method to generate optimal shape of the non-circular cross-section. For given width and height, arbitrary shape of the cross-section are described using the Hermite spline curves. Cross-section area and maximum stress level are chosen as performance indices, and nonlinear optimization problems are formulated with inequality constraints. Compared to a production spring wire, cross-section area can be reduced about 2.4 [%] without increasing maximum stress level. In addition, the other approach gives an optimum cross-section which reduces maximum stress level of 2.0 [%] without increasing cross-section area.
Keywords
Valve spring; Wire cross-section; Non-circular cross-section; Automotive engine; Shape optimization;
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