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.
Ana María Herrera | alfa
Smart Data Transformation – Surfing the Big Wave
02.12.2016 | Fraunhofer-Institut für Angewandte Informationstechnik FIT
Climate change could outpace EPA Lake Champlain protections
18.11.2016 | University of Vermont
Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.
Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
09.12.2016 | Life Sciences
09.12.2016 | Ecology, The Environment and Conservation
09.12.2016 | Health and Medicine