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Copula is a powerful tool for multivariate probability analysis. Estimation of distribution algorithms are a class of optimization algorithms based on probability distribution model. This paper introduces a new estimation of distribution algorithm with multivariate Gaussian copulas. In the algorithm, Gaussian copula parameters are firstly estimated by estimating Kendall's tau and using the relationship...
Air bending processes are analyzed in JCO forming for X80 welded pipe using plane strain element by the Finite Element Analysis Software Abaqus. In bending deformation, the springback is various for different punch radius and the final pipe geometries obtained are influenced. The residual stress and equivalent plastic strain distributions after unloading for five punch radius is discussed using static...
In this paper, the engine optimal matching is done to improve the efficiency of supercharging lean burn LPG engines by optimizing the compression ratio and the distribution phase of camshaft. The gas consumption and emissions of LPG engine are reduced. A whole engine model is set up on one-dimensional simulation software. The optimal compression ratio is determined by comparing the simulation computed...
Cloud model is an effective tool in uncertain transforming between qualitative concepts and their quantitative expressions. In this paper, we introduce a new optimization method inspired from cloud model theory. The innovations of the algorithm are the estimation of good solution regions and new solution production according to the cloud model theory. First, the algorithm uses information obtained...
To solve the premature convergence problem of particle swarm optimization, two novel methods are introduced to adjust the inertia weight in parallel according to different fitness values of two dynamic sub-swarms. When the fitness values of the particles are worse than the average, the inertia weight is adjusted by the introduced dynamic piecewise linear chaotic map which can make the local-optima...
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