Reducing Noise in the Transportation Landscape
In an unexpected discovery, researchers have found that highway noise barriers with jagged edges are better at shielding sound than those with smooth walls. Penelope Menounou and her colleagues at the University of Texas (email@example.com) have come up with an explanation for this phenomenon (1aNSb2). Maria Heckl of Keele University in England (firstname.lastname@example.org) will describe how the "curve squeal" created by trains as they round a bend is closely related to the exact friction-based process responsible for creating sound in a bowed string instrument such as a violin. To actively control these noises, Heckl has devised a feedback system that stabilizes the vibrations of the train wheels (2pSA1). Investigating the noise from another increasingly popular mode of transportation--motorcycle scooters--Cho H. Lu of the Industrial Technology Research Institute in Hsinchu, Taiwan (email@example.com) will show how padding the exhaust pipe and separating the power transmission box from the rest of the scooter can make them significantly quieter (5aNSb2).
Other Important Uses of Sound in Animals
Using a biological form of sonar, fish-eating flying bats have the amazing ability to detect underwater
Contact: Ben Stein
American Institute of Physics