[PDF] Top 20 Vibroacoustic Problems in High Speed Trains

... noise in the interior of the train is a very complex problem, involving many different parameters: complex geometries and mate- rials, different noise sources, complex interactions among those sources, broad range ... 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

... relationship in the wheel-rail contact it is very common to consider that wheels have the same state of motion with their relative points on the rail and it can be seen in [1], [4], [5], [8], [10], [11], ... See full document

... done in rail industry along the last years to characterize the noise sources [ ...treatments in order to reduce the sound pressure lev- el and increase the comfort of the passenger [ (Forssén 2011), (Choi ... See full document

... Discussion. In Table 1 the results of the parameter extraction in relation to the 1-diode/2-resistor and 2-diode/2-resistor equivalent circuit models of the Emcore ZTJ solar cell (see Figure 2) are ...data ... See full document

... 2013 In figure 8, the difference in the predicted overall sound pressure level A-weighted are presented for the different flow detachment sections hypothesis for the two different speeds, 300 and 350 ... See full document

... main problems that occurred were in high-speed simulations the methodology did not converge properly or as intended, and the proposal currently on the principle of having an overview of the ... See full document

... (CBM). In the run-to-break, the machines work until a fault occurs, this fault can have catastrophic results in the machined part or even in the rest of the ...variable, in which the ... See full document

... mid-length, in the form of an ellipsoid or, more feasibly with wet chemical etching, a rhomboid (see Figure ...forces in the liquid, promoting reagent accumulation and the formation of air paths once the ... 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

... 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

... Demand. In this paragraph the demand time dependencies are modelled. We assume that users of a origin- destination pair who want to travel during time period are prepared to use any adequate railway service which ... See full document

... wall in approximately ...tunnel in terms of pressure drag and friction resistance as ...typical high speed tunnel-train system, when the blockage ratio is around ...six trains travel ... See full document

... for high speed trains has experienced a considerable in- crease over the last 10 years, a big part of the resources have been invested in railway tunnels ...generated in the ... See full document

... presented in this communication are in accordance with the train wave signature and the pressure wave theories, summarized in ...detail in certain ...the trains under study, a detail ... See full document

... • If several functional modules are combined on a single PCB, the PCB should be partitioned into separate functional units. This is particularly important if analog and digital signals are being processed on the same ... 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

... 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

... Very High Rate Digital Subscriber Line (VDSL) es la última y mayor de las tecnologías XDSL, pudiendo suministrar rangos de datos hasta 52 Mbps de downstream y hasta 34 Mbps de upstream en ciertas versiones ... See full document

... tickets in advance and organise their trip by choosing a specific service, as frequencies are not as high as they are in transit ...systems. In these cases, the accessibility analyses ... See full document