Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Height sensitive: Rear crash protection devices for heavy trucks

17.11.2003


Penn State simulation testing suggests that barriers, called underride guards, placed on the rear end of heavy trucks to prevent cars from sliding underneath and being crushed in rear-end collisions may be less effective if placed lower or higher than 16 inches (400 mm) from the ground.

The National Highway Transportation Safety Administration regulations set a maximum ground clearance of 22 inches (560 mm) and no minimum for underride guards on new trucks.

The Penn State simulation study also showed that underride guards that include diagonal struts increase impact resistance. When the struts are used, vehicle penetration under the truck was fairly small in the simulations.



Dr. Moustafa El-Gindy, director of the Vehicle Simulation Research Center at Penn State’s Pennsylvania Transportation Institute, led the study. He says, "On average, 500 passenger vehicle occupants are killed and over 18,000 are injured each year in rear impact crashes with trucks."

El-Gindy presented the Penn State team’s results today (Nov. 17) at the ASME International Mechanical Engineering Congress and R & D Expo in Washington, D. C. Co-authors of the paper are Dr. Ali O. Atahan, assistant professor of civil engineering, Mustafa Kemal University in Turkey, and Abhishek S. Joshi, a master’s degree student in Penn State’s Department of Industrial and Manufacturing Engineering. The paper is "A Rear-End Protection Device for Heavy Vehicles. "

In the studies, the Penn State researchers used a commercially available computer simulation program, called LS-DYNA, to model different underride guard designs and a Geo Metro computer model from the National Crash Analysis Center as a representative of small passenger vehicles.

Sixteen simulations were carried out. In half, the underride guard had diagonal struts and the other half did not. Each underride guard was tested at four different heights from the ground, i.e. 12 inches (300mm), 16 inches (400 mm), 20 inches (500 mm) and 24 inches (600 mm). For each height, simulations were performed at 30 miles per hour (48 kph) and 40 miles per hour (64 kph). The Geo Metro impacted the underride guard head on.

The simulations, which were validated when compared to actual crash test results, suggest that the optimum height for the underride guard is 16 inches (400 mm) when the impacting vehicle is traveling at 40 miles per hour. When the height is higher or lower, risk for vehicle damage and injury to its occupants increase.

He notes "The impact behavior of the optimum underride guard should be further evaluated using different types of vehicles with varying bumper heights to gain broader acceptability."

Barbara Hale | Penn State
Further information:
http://www.psu.edu/ur/2003/crashpreventor.html

More articles from Transportation and Logistics:

nachricht Study sets new distance record for medical drone transport
13.09.2017 | Johns Hopkins Medicine

nachricht Researchers 'count cars' -- literally -- to find a better way to control heavy traffic
10.08.2017 | Florida Atlantic University

All articles from Transportation and Logistics >>>

The most recent press releases about innovation >>>

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

Im Focus: Nanoparticles help with malaria diagnosis – new rapid test in development

The WHO reports an estimated 429,000 malaria deaths each year. The disease mostly affects tropical and subtropical regions and in particular the African continent. The Fraunhofer Institute for Silicate Research ISC teamed up with the Fraunhofer Institute for Molecular Biology and Applied Ecology IME and the Institute of Tropical Medicine at the University of Tübingen for a new test method to detect malaria parasites in blood. The idea of the research project “NanoFRET” is to develop a highly sensitive and reliable rapid diagnostic test so that patient treatment can begin as early as possible.

Malaria is caused by parasites transmitted by mosquito bite. The most dangerous form of malaria is malaria tropica. Left untreated, it is fatal in most cases....

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

Corporate coworking as a driver of innovation

22.11.2017 | Business and Finance

PPPL scientists deliver new high-resolution diagnostic to national laser facility

22.11.2017 | Physics and Astronomy

Quantum optics allows us to abandon expensive lasers in spectroscopy

22.11.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>