Featured Research

from universities, journals, and other organizations

Virtual laboratory predicts train vibrations

Date:
February 9, 2011
Source:
Plataforma SINC
Summary:
A team of researchers Spain has designed a mathematical procedure for evaluating the vibrations produced by a train as it travels along its tracks. The model, which has been validated using data from the Madrid-Barcelona AVE high speed train line, makes it possible to predict the pattern of vibrations according to the type of train, the materials involved, and the condition of the track.

Researchers test in the computer what happens in the railway line.
Credit: SINC

A team of researchers from the Polytechnic University of Valencia (UPV, Spain) has designed a mathematical procedure for evaluating the vibrations produced by a train as it travels along its tracks. The model, which has been validated using data from the Madrid-Barcelona AVE high speed train line, makes it possible to predict the pattern of vibrations according to the type of train, the materials involved, and the condition of the track.

Related Articles


The construction of new rail lines, or the relocation of old ones underground, has increased society's interest over recent years in the vibrations produced by trains, especially among people who live or work near the tracks. Now a study headed by the Polytechnic University of Valencia (UPV) has made it possible to estimate the trajectory of vibrations from the point at which they are generated (wheel-rail contact) through to the ground.

"The model acts as a "virtual train laboratory', meaning that, if the parameters of the train or the track ballast are changed, it is possible to infer the pattern of the resulting vibrations," says Julia Real, professor of transport and railways at the UPV and lead author of the study. "This is ideal for testing changes that, if they work, could be put into practice."

If, for example, the data from an AVE high speed train with an aerodynamic nose are entered rather than those from another train with different mechanical characteristics, different vibration patterns are obtained. The same thing happens when comparing a track without any levelling defects with another older one, or if the condition or type of material used beneath the sleepers are changed.

"The results depend to a large extent on the elasticity, density and thickness of the materials, especially the ballast (gravel that the sleepers rest on)," points out Pablo Salvador, another UPV researcher, who is also a co-author of the study.

The scientists created the analytical model using mathematical equations that describe the frequency and number of waves. The details are published in the Journal Mathematical and Computer Modelling.

"It's a fairly robust model that is relatively simple to use, and which makes it possible to determine potential vibration levels in an area following the introduction of a rail line, and also provides input information for a 2D surface vibration propagation system," explains Salvador.

Validation on the Madrid-Barcelona line

The theoretical results have been successfully compared with experimental frequency and vibration duration measurements taken along the Madrid-Barcelona high speed line. This information was provided by the public company Ineco, which is attached to the Ministry of Public Works.

This study is the first of a series of three, which will use the same methodology to analyse two other rail facilities -- an urban tram line (line 1 of the FGV in Alicante) and a Spanish narrow gauge railway along the Santander-Liιrganes line.

"In the first case, which has just been published, we focused on 'the best' (new vehicles and tracks meeting maximum speed and international gauge requirements); in the second case, the urban tram calls for the greatest possible attention with regard to vibrations, requiring extreme care even though they have only small loads and speeds; and the third case will look at a mixed rail operation (passengers and merchandise) making optimum use of resources," explains Julia Real.

"These are three different kinds of rail facility, each having its own structure, requirements and determining factors... but all of which are tremendously efficient with regard to society and the environment," the researcher concludes.


Story Source:

The above story is based on materials provided by Plataforma SINC. Note: Materials may be edited for content and length.


Journal Reference:

  1. Pablo Salvador, Julia Real, Clara Zamorano, Antonio Villanueva. A procedure for the evaluation of vibrations induced by the passing of a train and its application to real railway traffic. Mathematical and Computer Modelling, 2011; 53 (1-2): 42 DOI: 10.1016/j.mcm.2010.07.016

Cite This Page:

Plataforma SINC. "Virtual laboratory predicts train vibrations." ScienceDaily. ScienceDaily, 9 February 2011. <www.sciencedaily.com/releases/2011/02/110209082638.htm>.
Plataforma SINC. (2011, February 9). Virtual laboratory predicts train vibrations. ScienceDaily. Retrieved October 24, 2014 from www.sciencedaily.com/releases/2011/02/110209082638.htm
Plataforma SINC. "Virtual laboratory predicts train vibrations." ScienceDaily. www.sciencedaily.com/releases/2011/02/110209082638.htm (accessed October 24, 2014).

Share This



More Matter & Energy News

Friday, October 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

3D Printed Instruments Make Sweet Music in Sweden

3D Printed Instruments Make Sweet Music in Sweden

Reuters - Innovations Video Online (Oct. 23, 2014) — Students from Lund University's Malmo Academy of Music are believed to be the world's first band to all use 3D printed instruments. The guitar, bass guitar, keyboard and drums were built by Olaf Diegel, professor of product development, who says 3D printing allows musicians to design an instrument to their exact specifications. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Chameleon Camouflage to Give Tanks Cloaking Capabilities

Chameleon Camouflage to Give Tanks Cloaking Capabilities

Reuters - Innovations Video Online (Oct. 22, 2014) — Inspired by the way a chameleon changes its colour to disguise itself; scientists in Poland want to replace traditional camouflage paint with thousands of electrochromic plates that will continuously change colour to blend with its surroundings. The first PL-01 concept tank prototype will be tested within a few years, with scientists predicting that a similar technology could even be woven into the fabric of a soldiers' clothing making them virtually invisible to the naked eye. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Jet Sales Lift Boeing Profit 18 Pct.

Jet Sales Lift Boeing Profit 18 Pct.

Reuters - Business Video Online (Oct. 22, 2014) — Strong jet demand has pushed Boeing to raise its profit forecast for the third time, but analysts were disappointed by its small cash flow. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Internet of Things Aims to Smarten Your Life

Internet of Things Aims to Smarten Your Life

AP (Oct. 22, 2014) — As more and more Bluetooth-enabled devices are reaching consumers, developers are busy connecting them together as part of the Internet of Things. (Oct. 22) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins