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The nose length is the key design parameter affecting the aerodynamic performance of high-speed maglev train, and the horizontal profile has a significant impact on the aerodynamic lift of the leading and trailing cars Hence, the study analyzes aerodynamic parameters with multi-objective optimization design.

The nose of normal temperature and normal conduction high-speed maglev train is divided into streamlined part and equipment cabin according to its geometric characteristics. Then the modified vehicle modeling function (VMF) parameterization method and surface discretization method are adopted for the parametric design of the nose. For the 12 key design parameters extracted, combined with computational fluid dynamics (CFD), support vector machine (SVR) model and multi-objective particle swarm optimization (MPSO) algorithm, the multi-objective aerodynamic optimization design of high-speed maglev train nose and the sensitivity analysis of design parameters are carried out with aerodynamic drag coefficient of the whole vehicle and the aerodynamic lift coefficient of the trailing car as the optimization objectives and the aerodynamic lift coefficient of the leading car as the constraint. The engineering improvement and wind tunnel test verification of the optimized shape are done.

Results show that the parametric design method can use less design parameters to describe the nose shape of high-speed maglev train. The prediction accuracy of the SVR model with the reduced amount of calculation and improved optimization efficiency meets the design requirements.

Compared with the original shape, the aerodynamic drag coefficient of the whole vehicle is reduced by 19.2%, and the aerodynamic lift coefficients of the leading and trailing cars are reduced by 24.8 and 51.3%, respectively, after adopting the optimized shape modified according to engineering design requirements.

Das Thema hat zwei Begriffe zur Grundlage, die beide noch nicht restlos zufriedenstellend definiert werden konnten. Vielleicht liegt dies auch an der schnellen Entwicklung. Beim Fremdenverkehr jedenfalls ist es evident, dass sein begrifflicher Inhalt laufenden Veränderungen unterworfen ist. Er wurde aus einem Vorrecht begüterter Kreise, ja Klassen der Gesellschaft immer mehr zu einer Massenbewegung, die alle Schichten der menschlichen Gesellschaft zu erfassen in der Lage ist. Dabei kommen aber gleichzeitig stets neue Arten des Fremdenverkehrs auf; schon dadurch wird der Umfang des Begriffes «Fremdenverkehr» ständig verschoben und ausgeweitet.