Corrugated cardboard presents small geometries that make unfeasible the use of detailed three-dimensional numerical models, though homogenization approaches can be used to define equivalent homogenous plate models at a macro-mechanical scale. In this paper, we performed finite element analysis well-known chair design, originally made honeycomb cardboard, but replacing material with single- and multiple-wall corrugated cardboard. We compared deflections obtained under some load cases defined...

Overhead rigid conductor arrangements for current collection railway traction have some advantages compared to other, more conventional, energy supply systems. They are simple, robust and easily maintained, not mention their flexibility as the required height installation, which makes them particularly suitable use in subway infrastructures. Nevertheless, due increasing speeds of new vehicles running on modern lines, a efficient design is this kind system. In paper, authors present dynamic...

A sensitivity analysis has been performed to assess the influence of elastic properties railway vehicle suspensions on dynamic behaviour. To do this, 144 simulations were modifying, one at a time, stiffness and damping coefficients, primary secondary suspensions. Three values assigned each parameter, corresponding percentiles 10, 50 90 data set stored in database vehicles. After processing results these simulations, analysed parameters sorted by increasing influence. It was also found which...

A sensitivity analysis has been performed to assess the influence of inertial properties railway vehicles on their dynamic behaviour. To do this, 216 simulations were modifying, one at a time, masses, moments inertia and heights centre gravity carbody, bogie wheelset. Three values assigned each parameter, corresponding percentiles 10, 50 90 data set stored in database vehicles. After processing results these simulations, analysed parameters sorted by increasing influence. It was also found...

This study focuses on the effectiveness of resilient wheels in reducing railway noise and vibrations, compares three types wheels. The finite element method has been used to characterize vibratory behaviour these model excited with a realistic spectrum vertical track irregularities, spectral analysis carried out. Results have post-processed order estimate sound power emitted. These calculations assess wheel designs emitted environment propagating structural vibrations.

Vehicle–track interaction for a new resilient slab track designed to reduce noise and vibration levels was analysed, in order assess the derailment risk on curved when encountering broken rail. Sensitivity of rail support spacing relative position breakage between two adjacent supports running speed were analysed different elasticities fastening system. In none cases observed an appreciable difference either elastic systems. As expected, most unfavourable situations those with greater...

This work describes an analytical approach to determine what degree of accuracy is required in the definition rail vehicle models used for dynamic simulations. way it would be possible know advance how results simulations may altered due existence errors creation rolling stock models, whilst also identifying their critical parameters. make maximise time available enhance analysis and focus efforts on factors that are strictly necessary. In particular, parameters related both track quality...

To study the fluid motion-vehicle dynamics interaction, a model of four, liquid filled two-axle container freight wagons was set up. The railway vehicle has been modelled as multi-body system (MBS). include sloshing, an equivalent mechanical developed and incorporated. influence several factors studied in computer simulations, such track defects, curve negotiation, train velocity, wheel wear, solid wagonload, baffles. SIMPACK used for MBS analysis, ANSYS sloshing modelling systems...

The current article presents the results of a research study that dealt with simulation vehicle—track interaction for new slab track design, conceived to reduce noise and vibration levels transmitted neighbouring buildings. This design is mainly distinguished by its high elasticity damping. A more elastic track, however, leads greater rail deflections, which could affect train's overall running safety. In this study, derailment risk trains on when encountering broken has been evaluated. Two...

The purpose of this study is to determine the critical wear levels contact wire catenary on metropolitan lines. has focussed zones where localized produced, normally associated with appearance electric arcs. To end, a finite element model been developed dynamics pantograph—catenary interaction. includes zone and singularity in order simulate worst case scenario from point view stresses. In consider different stages process, depths widths were defined. results dynamic simulations performed...

A traditional use of bioenergy is the main source residential energy in developing countries, essentially using firewood to cook, boil water or heating affecting people countries. Improved cook stoves are more efficient and less polluting, there a need evaluate different design options facilitate their adoption. There types very economical improved cookstoves with high combustion efficiency. In Mexico, multiple projects about have been carried out, root this study being one them: Patsari...

Corrugated cardboard has waved cores with small flutes that prevent the use of detailed numerical models whole structures. Many homogenization methods in literature overcome this drawback by defining equivalent homogeneous plates same mechanical behaviour at a macro-mechanical scale. However, few works have considered complete structures, focusing mainly on beams or plates. For first time, study explores application approaches to larger structures as an aid their design process. We also...

The present paper, describe how to carry out the study of influence strong cross winds on high-speed trains, and draw conclusions mitigate these effects by means analysis with computer fluid dynamics. Due high speed increase mileage in railway traffic lightening axis weight, effect aerodynamic loads trains due are becoming more important. These have a negative stability travelling at high-speed. They can disturb normal operation, cause damages infrastructures or even accidents like...