Search results for "Transition curve"

showing 3 items of 3 documents

Using Genetic Algorithms for Optimizing the PPC in the Highway Horizontal Alignment Design.

2016

Various studies have emphasized the interesting advantages related to the use of new transition curves for improving the geometric design of highway horizontal alignments. In a previous paper, one of the writers proposed a polynomial curve, called a polynomial parametric curve (PPC), proving its efficiency in solving several design problems characterized by a very complex geometry (egg-shaped transition, transition between reversing circular curves, semidirect and inner-loop connections, and so on). The PPC also showed considerable advantages from a dynamic perspective, as evidenced by the analysis of the main dynamic variables related to motion (as well as rate of change of radial accelera…

050210 logistics & transportationPolynomialMathematical optimizationFitness function05 social sciencesPerspective (graphical)Motion (geometry)020101 civil engineering02 engineering and technologyTransition curve0201 civil engineeringComputer Science ApplicationsGeometric designComplex geometryGenetic algorithmGenetic algorithms Horizontal alignment Polynomial curve Transition curve0502 economics and businessHorizontal alignment.Polynomial curveSettore ICAR/04 - Strade Ferrovie Ed AeroportiReversingParametric equationAlgorithmCivil and Structural EngineeringMathematics
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A PSO algorithm for designing 3d highway alignments adopting polynomial solutions

2017

Intelligent optimization algorithms for highway alignments have produced good results so far. However, considering the numerous constraints and factors directly implied in the infrastructure design, the researchers' efforts usually focus only on simplifying the alignment choice, supporting engineers in the design phase. Implementing strategic considerations regarding comfort and safety would be also very important. In this paper, the authors propose a method for designing improved 3D highway alignments using a specific optimization algorithm, based on a Swarm Intelligence technique, adopting an innovative polynomial transition curve as the unique horizontal curvature element, called PPC (Po…

OptimizationArtificial intelligenceDesignPolynomial approximationPSO3D highway alignmentCurve fittingSettore ICAR/04 - Strade Ferrovie Ed AeroportiAlignment Artificial intelligence Curve fitting Design Optimization Polynomial approximationtransition curveAlignment
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An algorithm based on the PPC (Polynomial Parametric Curve) for designing horizontal highway alignments

2015

Criteria for geometric design of highway alignments have been studied in various researches so far, providing new methods, as alternative to traditional approaches. They can be useful for obtaining better solutions, characterized by high performances in terms of motion safety and comfort. In particular, continuous curvature alignments, based on polynomial functions, are highly consistent solutions with users' driving behaviour and vehicle trajectories. Moreover, alignment geometry optimization allows engineers to minimize dynamic effects on drivers with considerable advantages in terms of comfort and safety. This paper carries on the research of a previous study, in which a polynomial param…

polynomial curvestransition curvesHighway design polynomial curves transition curvesSettore ICAR/04 - Strade Ferrovie Ed AeroportiHighway design
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