[PDF] Top 20 Aeroacoustics in high speed trains

... issue in the design of engineering struc- tures (aircraft, wind turbines, bridges, tall buildings, power lines, ...found in Crawley et ...induced in the structure, which change the angle of attack, ... See full document

... km/h. In these figures the results obtained with the method propossed above are compared with those obtained using the moving loads method (see [27]) which does not consider the interaction between vehicle and ... See full document

... around high speed trains in open ...train in open field by using finite element method FEM, boundary element method (BEM) and statistical energy analysis (SEA) depending on the ... See full document

... as high as 800 Pa, in the rear section there is no overpressure, and an expansion wave is ...obtained in all the trains under study, being the explanation quite simple: While the head of the ... See full document

... number; in addition, j=integer number taking values equal to or greater than ...resonance speed V-¡ ...explained in (Yang et ...that in any given instant have abandoned the bridge; as a ... See full document

... The train services are grouped in lines. A line is characterized by its terminal stations, by a path through the infrastructure between the terminals, and by a set of stations along the path. Train services run up ... See full document

... focused in pantograph noise, only the results obtained for this source will be ...of trains riding at operation conditions has been measured, processed and compared to come to the following ...pantograph ... See full document

... that in comparative terms the vibration effects in such bridges from moving railway traffic are generally significantly smaller than for simply supported (isostatic) ...established in railway ... See full document

... services in simple composition and 3 in double composition; 19 trains services are not ...shown in Figure ...services in the best ... See full document

... During the last years a research plan has being developed at IDR/UPM (Insti- tuto de Microgravedad “Ignacio Da Riva”, Universidad Polit´ecnica de Madrid) involving both numerical simulations, wind tunnel and full-scale ... See full document

... flow in the standard tunnel geometry and in the configuration with airshafts along the tunnel ...ducted in a scaled facility where train models travelled at a maximum velocity of about 150 km/h ... See full document

... amplifier. In most cases a ...at high frequencies the impedance of a capacitor ...at high frequencies. Placing a ceramic bypass capacitor, in the range of 10 nF to 100 nF directly at the ... See full document

... trips in the Spanish HSR ...friction in network analyses, reveal the potentials of network configurations but generally overestimate the outcomes, as they assume all nodes in a network are equally ... See full document

... coefficient, and six cepstrum coefficients. The selected process variables were the acceleration signals from the workpiece and the cutting force signals. After an intensive searching procedure, four different ANN models ... See full document

... The sample was prepared by filling a stoppered bottle of 21 cm 3 and degassing it with an ultrasound bath PSelecta, model Ultrasons H, to prevent bubbles formation and consequently an air intake in the ... See full document

... In a previous contribution to the CST 2002 conference [9], the authors presented a formulation of the equations of motion of the SIM based on dimensionless parameters, very similar to [r] ... See full document

... 1998). This wall-to-wall design allows a reasonable compensation of the lateral refraction when measuring the traverse angles (used to carry forward the azimuths), and also enables it to be quantified more easily. Under ... See full document

... Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of ... See full document

... Efficiency impacts are assessed in terms of the improvements in accessibility resulting from the HSR project, with a focus on major urban areas; and spatial equity implications are der[r] ... See full document

... Moreover, it can be shown that the maximum reductions of the bridge response take place at the resonance speeds (or wavelengths), thus making the moving loads model excessively conser[r] ... See full document