Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Helmet-to-helmet collisions: Scientists model how vibrations from football hits wobble the brain

19.10.2012
It's fall football season, when fight songs and shouted play calls fill stadiums across the country. Another less rousing sound sometimes accompanies football games: the sharp crack of helmet-to-helmet collisions.

Hard collisions can lead to player concussions, but the physics of how the impact of a helmet hit transfers to the brain are not well understood. A research team from the U.S. Naval Academy in Annapolis, Md., has created a simplified experimental model of the brain and skull inside a helmet during a helmet-to-helmet collision.

The model illustrates how the fast vibrational motion of the hit translates into a sloshing motion of the brain inside the skull. The researchers will present their findings at the 164th meeting of the Acoustical Society of America (ASA), held Oct. 22 – 26 in Kansas City, Missouri.

Murray Korman, a professor in the physics department at the U.S. Naval Academy, worked with his student Duncan Miller during the course of a semester to develop the experimental model. To simulate a side collision, the researchers hung one helmet from the ceiling with clothesline and swung the second helmet into the first, like a pendulum. Accelerometers mounted on the helmets recorded the vibrations before, during, and after the hit.

Figuring out simple ways to model a human head inside the helmets was a challenge, Korman notes. Human cadavers were out, and crash test mannequins were too expensive. After reading up on skull vibrations, the team settled on a wide plastic hoop, shaped like the skirt of a bell. "They say that when you get hit, you get your bell rung. No pun intended, but your skull does kind of ring like a bell," Korman says.

The researchers modeled the brain as a brass cylinder cushioned in a slot carved out of open-cell foam that mimicked fluid within the brain cavity. By choosing simple materials the researchers minimized the complexity of their set-up while retaining those elements needed to capture the essential motions of the brain and the skull. They found that their brass cylinder brain sloshed back and forth within the skull much more slowly than the rate of vibration of the initial hit. Building a model is important, Korman notes, because it can help determine how a measurable parameter, like the acceleration of a helmet during a hit, would translate into potentially damaging brain motion. "The ultimate damage comes when the brain hits the side of the skull," Korman says.

Korman says there is still a lot of work to do to improve the model. He hopes in the future to collaborate with biophysicists to incorporate more detailed knowledge of the material properties of the brain and skull. Ultimately, the model might be used to test new helmets designed to better protect the brain from hits. Korman describes futuristic helmets that might crumple on impact like plastic car bumpers, leaving the only bell ringing on the field to be done by the marching band.

MORE INFORMATION ABOUT THE 164th ASA MEETING

The Kansas City Marriott Downtown Hotel is located at 200 West 12th Street, Kansas City, Missouri, 64105. The hotel main numbers are: 816-421-6800; fax: 816-855-4418.

USEFUL LINKS

Main meeting website: http://acousticalsociety.org/meetings/kansas_city
Meeting Abstract Database: http://asa.aip.org/asasearch.html
Hotel site: https://resweb.passkey.com/Resweb.do?mode=welcome_ei_new&eventID=8120158
WORLD WIDE PRESS ROOM

ASA's World Wide Press Room contains additional tips about newsworthy stories and with lay-language papers, which are 300-1200 word summaries of presentations written by scientists for a general audience and accompanied by photos, audio, and video.
PRESS REGISTRATION

ASA will grant free registration to credentialed full-time journalists and professional freelance journalists working on assignment for major news outlets. If you are a reporter and would like to attend, contact Charles E. Blue (cblue@aip.org, 301-209-3091), who can also help with setting up interviews and obtaining images, sound clips, or background information.

This news release was prepared for the Acoustical Society of America (ASA) by the American Institute of Physics (AIP).
ABOUT THE ACOUSTICAL SOCIETY OF AMERICA

The Acoustical Society of America (ASA) is the premier international scientific society in acoustics devoted to the science and technology of sound. Its 7,000 members worldwide represent a broad spectrum of the study of acoustics. ASA publications include The Journal of the Acoustical Society of America (the world's leading journal on acoustics), Acoustics Today magazine, ECHOES newsletter, books, and standards on acoustics. The Society also holds two major scientific meetings each year. For more information about ASA, visit our website at http://www.acousticalsociety.org.

Charles E. Blue | EurekAlert!
Further information:
http://www.aip.org

More articles from Physics and Astronomy:

nachricht CCNY-Yale researchers make shape shifting cell breakthrough
12.12.2018 | City College of New York

nachricht Electronic evidence of non-Fermi liquid behaviors in an iron-based superconductor
11.12.2018 | Science China Press

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

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

Im Focus: Lethal combination: Drug cocktail turns off the juice to cancer cells

A widely used diabetes medication combined with an antihypertensive drug specifically inhibits tumor growth – this was discovered by researchers from the University of Basel’s Biozentrum two years ago. In a follow-up study, recently published in “Cell Reports”, the scientists report that this drug cocktail induces cancer cell death by switching off their energy supply.

The widely used anti-diabetes drug metformin not only reduces blood sugar but also has an anti-cancer effect. However, the metformin dose commonly used in the...

Im Focus: New Foldable Drone Flies through Narrow Holes in Rescue Missions

A research team from the University of Zurich has developed a new drone that can retract its propeller arms in flight and make itself small to fit through narrow gaps and holes. This is particularly useful when searching for victims of natural disasters.

Inspecting a damaged building after an earthquake or during a fire is exactly the kind of job that human rescuers would like drones to do for them. A flying...

Im Focus: Topological material switched off and on for the first time

Key advance for future topological transistors

Over the last decade, there has been much excitement about the discovery, recognised by the Nobel Prize in Physics only two years ago, that there are two types...

Im Focus: Researchers develop method to transfer entire 2D circuits to any smooth surface

What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.

Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...

Im Focus: Three components on one chip

Scientists at the University of Stuttgart and the Karlsruhe Institute of Technology (KIT) succeed in important further development on the way to quantum Computers.

Quantum computers one day should be able to solve certain computing problems much faster than a classical computer. One of the most promising approaches is...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

ICTM Conference 2019: Digitization emerges as an engineering trend for turbomachinery construction

12.12.2018 | Event News

New Plastics Economy Investor Forum - Meeting Point for Innovations

10.12.2018 | Event News

EGU 2019 meeting: Media registration now open

06.12.2018 | Event News

 
Latest News

New discoveries predict ability to forecast dementia from single molecule

12.12.2018 | Health and Medicine

CCNY-Yale researchers make shape shifting cell breakthrough

12.12.2018 | Physics and Astronomy

Pain: Perception and motor impulses arise in the brain independently of one another

12.12.2018 | Health and Medicine

VideoLinks
Science & Research
Overview of more VideoLinks >>>