Binaural reproduction for headphone-based listening is an active research area due to its widespread use in evolving technologies such as augmented and virtual reality (AR and VR). On the one hand, these applications ...
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In the paper, an optimum proposal of wire tensions based on the penalty function is given and a nonlinear mathematical model of wire tensions is established. By use of the penalty function algorithm, the constrained o...
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ISBN:
(纸本)9781849195379
In the paper, an optimum proposal of wire tensions based on the penalty function is given and a nonlinear mathematical model of wire tensions is established. By use of the penalty function algorithm, the constrained optimization problem of wire tensions will be transformed into unconstrained optimization problem. Two cases which are different minimum preloads at zero attitude position and the same minimum preload at different attitude positions are given to analyse the algorithm. The simulation results show that the curves of wire tensions are relatively smooth. There is no changed impact, and the values of the maximum tensions obtained are also realistic.
In this paper, we propose a method to determine fuel-optimal trajectories for satellite formation maneuver subjected to collision avoidance using low-thrust continuous propulsion. Final bounded desired formation is ob...
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ISBN:
(纸本)9780877035442
In this paper, we propose a method to determine fuel-optimal trajectories for satellite formation maneuver subjected to collision avoidance using low-thrust continuous propulsion. Final bounded desired formation is obtained by including energy-matching condition and final geometry configuration constraints in the optimization formulation. The dynamics model used is a newly developed exact nonlinear relative dynamics considering eccentricity and earth oblateness. Resulting nonlinear optimal control problem is transcribed into nonlinear programming problem by a direct transcription method called Legendre pseudospectral method. The nonlinear programming problem is then solved using a sparse nonlinear optimization algorithm named SNOPT. Examples are presented across a range of applications. These examples demonstrate the applicability of Legendre pseudospectral method to optimal trajectory design for formation maneuver.
The Direct Waveform Inversion (DWI) is a new full-waveform inversion idea that is different from current full waveform inversion (FWI) procedures. DWI combines the seismic imaging and velocity inversion into one proce...
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Energy-saving train operation is an important means to reduce the energy consumption of rail transit system. This paper mainly aims at the problem that different driving strategies will produce different energy and ti...
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The area of the electricity sector that deals with energy needs by the hydroelectric in a coordinated manner, is called Operation Planning of Hydrothermal Power Systems (OPHPS). The purpose of this is to find a politi...
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ISBN:
(纸本)9781467371728
The area of the electricity sector that deals with energy needs by the hydroelectric in a coordinated manner, is called Operation Planning of Hydrothermal Power Systems (OPHPS). The purpose of this is to find a political operative to provide electrical power to the system in a given period, with reliability and minimal cost. Therefore it is necessary to determine an optimal schedule of generation for each hydroelectric, each range, so that the system meets the demand reliably, avoiding rationing in years of severe drought, and that minimizes the expected cost of operation during the planning, defining an appropriate strategy for thermal complementation. Several optimization algorithms specifically applied to this problem have been developed and are used. Although providing solutions to various problems encountered, these algorithms have some weaknesses, difficulties in convergence, simplification of the original formulation of the problem, or owing to the complexity of the objective function. An alternative to these challenges is the development of techniques for simulation optimization and more sophisticated and reliable, it can assist the planning of the operation. Thus, this paper presents the development of a computational tool (Hydro-AI) for solving optimization problem identified and to provide the User an easy handling. Adopted as intelligent optimization technique Genetic Algorithm (GA) and programming language Java. First made the modeling of the chromosomes, then implemented the function assessment of the problem and the operators involved, and finally the drafting of the graphical interfaces for access to the User. The results with the Genetic Algorithms were compared with the optimization technique nonlinear programming (NLP). Tests were conducted with one, three and seven hydroelectric plants interconnected hydraulically. The results of comparison between the GA and NLP techniques shows that the cost of operating the GA becomes increasingly smaller than
作者：
Sampaio, Ph. R.Toint, Ph. L.
Department of Mathematics University of Namur 61 rue de Bruxelles NamurB-5000 Belgium
A trust-funnel method is proposed for solving nonlinear optimization problems with general nonlinear constraints. It extends the one presented by Gould and Toint [nonlinear programming without a penalty function or a ...
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The Linear Sampling Method (LSM) is a promising inverse scattering approach that offers several desirable qualities over traditional filtered back-projection and non-linear optimization approaches. The quality of the ...
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Classical control laws for power converters are based on the average model. Usually, they have a good performance in the transient. Nevertheless, the steady state behavior is not well-controlled (waveform, subharmonic...
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The increasing amount of electric vehicle has brought threat on the distribution network reliability, but it also provides great load flexibility opportunities. With appropriate guidance, electric vehicle charging loa...
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