Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

A new system for determining the dynamic behavior of a bus body structure

19.01.2010
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.

Real applications.

“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.

Full bibliographic information
Títle: Simplified dynamic torsional model of an urban bus
Authors: Antonio Gauchía Babé, Maria Jesús López Boada, Beatriz López Boada y Vicente Díaz López
Review: International Journal of Heavy Vehicle Systems 16 (3): 341-353 2009
ISSN: 1744-232X

Ana María Herrera | alfa
Further information:
http://www.uc3m.es
http://www.uc3m.es/portal/page/portal/actualidad_cientifica/noticias/carroceria_autobuses

Further reports about: Heavy Vehicle Systems UC3M Vehicle bus body structure rollover limit

More articles from Studies and Analyses:

nachricht Antarctic Ice Sheet mass loss has increased
14.06.2018 | Technische Universität Dresden

nachricht WAKE-UP provides new treatment option for stroke patients | International study led by UKE
17.05.2018 | Universitätsklinikum Hamburg-Eppendorf

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Temperature-controlled fiber-optic light source with liquid core

In a recent publication in the renowned journal Optica, scientists of Leibniz-Institute of Photonic Technology (Leibniz IPHT) in Jena showed that they can accurately control the optical properties of liquid-core fiber lasers and therefore their spectral band width by temperature and pressure tuning.

Already last year, the researchers provided experimental proof of a new dynamic of hybrid solitons– temporally and spectrally stationary light waves resulting...

Im Focus: Overdosing on Calcium

Nano crystals impact stem cell fate during bone formation

Scientists from the University of Freiburg and the University of Basel identified a master regulator for bone regeneration. Prasad Shastri, Professor of...

Im Focus: AchemAsia 2019 will take place in Shanghai

Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.

Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...

Im Focus: First real-time test of Li-Fi utilization for the industrial Internet of Things

The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.

Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.

Im Focus: Sharp images with flexible fibers

An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.

Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Munich conference on asteroid detection, tracking and defense

13.06.2018 | Event News

2nd International Baltic Earth Conference in Denmark: “The Baltic Sea region in Transition”

08.06.2018 | Event News

ISEKI_Food 2018: Conference with Holistic View of Food Production

05.06.2018 | Event News

 
Latest News

Graphene assembled film shows higher thermal conductivity than graphite film

22.06.2018 | Materials Sciences

Fast rising bedrock below West Antarctica reveals an extremely fluid Earth mantle

22.06.2018 | Earth Sciences

Zebrafish's near 360 degree UV-vision knocks stripes off Google Street View

22.06.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>