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1. Analysis and optimization of an innovative fatigue tests profile for three axle semi-trailers.

Author

Malon, H., Tello, L., and Martin, C.

Subjects
*MATHEMATICAL optimization, *MATERIAL fatigue, *TRAILERS, *EXPERIMENTAL design, *PROTOTYPES, *PERFORMANCE evaluation, *TRANSPORTATION engineering, UNIVERSITY of Zaragoza (Zaragoza, Spain)
Abstract

Nowadays, a fundamental aspect in the design of any type of vehicle, in particular of semi-trailers, is the development and testing of prototypes that confirm the correct performance of the vehicles before their launch into the market. At present, fatigue tests exist for different structural components from large machines to small components in vehicles, but up to now, there is no knowledge about fatigue tests of complete vehicles of large dimensions, with the exception of the fatigue tests of semi-trailers that are carried out by the company LECITRAILER S.A., under the supervision of the Transportation Engineering Area of the University of Zaragoza, in particular the research group VEHIVIAL. The aim of this paper is to decribe the process developed for the analysis and optimization of an initial profile of fatigue testing for semitrailer. The result of this optimization process is an innovative profile of fatigue testing for three axle semi-trailers developed by the University of Zaragoza in collaboration with the company LECITRAILER S.A., which is applied to the process of optimization of all the prototypes made by the company. [ABSTRACT FROM AUTHOR]

Published
2011
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2. Cost optimization of the design of CHCP (combined heat, cooling and power) systems under legal constraints

Author

Lozano, Miguel A., Ramos, Jose C., and Serra, Luis M.

Subjects
*COGENERATION of electric power & heat, *HEAT storage, *COOLING, *ELECTRIC power systems, *HEAT radiation & absorption, *LINEAR programming, *MATHEMATICAL optimization
Abstract

Abstract: Combined heat, cooling and power (CHCP) systems are interesting for the supply of different energy services in urban districts and in large buildings. CHCP systems utilize a fuel''s energy to a greater extent, because the cogenerated heat can be used for heating in winter as well as for cooling in summer with an absorption refrigerator. The use of thermal energy storage (TES) provides the additional advantage of covering variable thermal demands while the production system operates continuously at nominal conditions. Thus, energy supply systems integrating the technologies of cogeneration, absorption refrigeration and thermal storage can provide substantial benefits from economic, energetic and environmental viewpoints. In this paper an optimization model is developed, using mixed integer linear programming (MILP), to determine the preliminary design of CHCP systems with thermal storage. The objective function to be minimized is the total annual cost. Taking into account the legal constraints imposed on cogeneration systems in Spain, the optimization model is applied to design a system providing energy services for a set of buildings constituted of 5000 apartments located in the city of Zaragoza (Spain). The effect of legal constraints in the design and operation of CHCP systems is highlighted in this study. [Copyright &y& Elsevier]

Published
2010
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