Featured Research

from universities, journals, and other organizations

Protecting passengers: New system for determining the dynamic behavior of a bus body structure

Date:
January 21, 2010
Source:
Universidad Carlos III de Madrid - Oficina de Información Científica
Summary:
Scienitists have developed a mathematical model which simplifies and speeds up the study of bus body structure, one of the key elements in protecting bus passengers.

Bus structure.
Credit: Image courtesy of Universidad Carlos III de Madrid - Oficina de Información Científica

Scienitists have developed a mathematical model which simplifies and speeds up the study of bus body structure, one of the key elements in protecting bus passengers.

Related Articles


One of the accidents in which a bus can be involved is bus rollover. In these cases, the body structure is essential for the protection of the passengers, and the scientists analyze how to improve the structure's behavior when dealing with an event of this kind. Along these lines, the study carried out by the researchers from the UC3M Instituto de Seguridad de los Vehículos Automóviles (Automobile Safety Institute) (ISVA) proposes a mathematic model to estimate the vibration frequencies of the bus structure itself.

What is remarkable about it, according to one of the authors of the study, Antonio Gauchía, from the UC3M Mechanical Engineering Department, is its simplicity: "There are other numerical techniques such as the finite element method, to determine the vibration's own frequency, but this model allows it to be done in a faster and simpler fashion."

The idea behind this research arose from the need to improve the behavior of bus body structure, and especially to increase the torsional rigidity, "In some vehicles headlights that break because they are not rigid enough have been observed," according to Professor Gauchía. "Moreover," he continued, "it has been observed that this factor is particularly relevant in the increase of the rollover threshold, and that as such, results in greater vehicle safety. Several factors are involved in obtaining a resistant rigid torsion structure, such as the dimensions of the cross-section of the profiles that make up the structure, the material of the profiles and the availability of the same in the bus structure.

"This research study, as well as others that we are carrying out along these same lines, have direct application in the bus sector, since they not only improve safety but also evolve from the idea of an oversized structure to a body structure somewhat smaller in design, in which variables such as weight, consumption, torsional rigidity, etc., are taken into account," explained the ISVA Director, UC3M Full Professor Vicente Díaz, one of the authors of the study, which was recently published in the International Journal of Heavy Vehicle Systems.

In driving conditions, vehicle rollover depends on a parameter (known as "rollover threshold") which is determined by the lateral acceleration from which the vehicle initiates the process. In this way, the larger the parameter, the greater the lateral acceleration that the vehicle would have to be subject to in order to make it roll over, thus, making the vehicle safer. "A body structure with high torsional rigidity increases the rollover limit and in addition offers a higher level of safety," Gauchía pointed out. On the other hand, if the rollover occurs and the body structure hits the ground, it should be sufficiently resistant so as to protect the passengers. Concretely, the Reglamento de Ginebra (Geneva Regulation) R66 and la Directiva (Guideline) 2001/85/CE establish that the bus structure be sufficiently rigid so as to maintain a space inside the bus, termed the survival space, in which no object can enter or exit.


Story Source:

The above story is based on materials provided by Universidad Carlos III de Madrid - Oficina de Información Científica. Note: Materials may be edited for content and length.


Journal Reference:

  1. Gauchia et al. Simplified dynamic torsional model of an urban bus. International Journal of Heavy Vehicle Systems, 2009; 16 (3): 341 DOI: 10.1504/IJHVS.2009.027137

Cite This Page:

Universidad Carlos III de Madrid - Oficina de Información Científica. "Protecting passengers: New system for determining the dynamic behavior of a bus body structure." ScienceDaily. ScienceDaily, 21 January 2010. <www.sciencedaily.com/releases/2010/01/100119074846.htm>.
Universidad Carlos III de Madrid - Oficina de Información Científica. (2010, January 21). Protecting passengers: New system for determining the dynamic behavior of a bus body structure. ScienceDaily. Retrieved December 21, 2014 from www.sciencedaily.com/releases/2010/01/100119074846.htm
Universidad Carlos III de Madrid - Oficina de Información Científica. "Protecting passengers: New system for determining the dynamic behavior of a bus body structure." ScienceDaily. www.sciencedaily.com/releases/2010/01/100119074846.htm (accessed December 21, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Sunday, December 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Building Google Into Cars

Building Google Into Cars

Reuters - Business Video Online (Dec. 19, 2014) — Google's next Android version could become the standard that'll power your vehicle's entertainment and navigation features, Reuters has learned. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
AP Review: Nikon D750 and GoPro Hero 4

AP Review: Nikon D750 and GoPro Hero 4

AP (Dec. 19, 2014) — What to buy an experienced photographer or video shooter? There is some strong gear on the market from Nikon and GoPro. The AP's Ron Harris takes a closer look. (Dec. 19) Video provided by AP
Powered by NewsLook.com
Double-Amputee Becomes First To Move Two Prosthetic Arms With His Mind

Double-Amputee Becomes First To Move Two Prosthetic Arms With His Mind

Buzz60 (Dec. 19, 2014) — A double-amputee makes history by becoming the first person to wear and operate two prosthetic arms using only his mind. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com
Navy Unveils Robot Fish

Navy Unveils Robot Fish

Reuters - Light News Video Online (Dec. 18, 2014) — The U.S. Navy unveils an underwater device that mimics the movement of a fish. Tara Cleary reports. Video provided by Reuters
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