in this research, the calculation method of aerodynamic loads on an airplane in all flight situations is presented. in order to find an calculation equation for aerodynamic loads on an airplane in all flight conditions, the f-5 aircraft is selected as a prototype is divided into one hundred small parts longitudinally. therefore, the numerical solutions are taken place in different conditions of...

In order to understand the mechanism by which a pantograph can generate aerodynamic noise and grasp its far-field characteristics, simplified double-strip is analyzed numerically. Firstly, unsteady flow field around simulated in frame of large eddy simulation (LES) technique. Then location main source determined using surface fluctuating pressure data vortex structures are means Q-criterion. Ba...

Sweden is now considering new railway lines typically adapted to high speeds up to 320 km/h. Noise impact from high-speed lines and noise mitigation measures where required becomes urgent to be investigated. As the current calculation model for railway noise used in Sweden is not applicable for the purpose, the Swedish Transport Administration decides to prepare a new noise assessment method fo...

Abstract In this paper, the unsteady flow around a high-speed train is numerically simulated by detached eddy simulation method (DES), and far-field noise predicted using Ffowcs Williams-Hawkings (FW-H) acoustic model. The reliability of numerical calculation verified wind tunnel experiments. superposition relationship between radiated local aerodynamic sources whole source analyzed. Since trai...

This paper presents the noise characteristics of axial fans in process variable frequency adjustment, so as to clarify basis adjustment and high-risk area division for practical purposes. In aerodynamic performance experiment, 11 kinds operating conditions (OC) were divided into 3 groups, air flow rate power consumption measured. At same time, an experiment was carried out, nine measuring point...