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Current issue

ELEKTRO 5/2017 was released on May 11th 2017. Its digital version will be available on June 6th 2017.

Topic: Lightning and overvoltage protection; 23rd ELO SYS 2017

Main Article

Vibrations of rotary machines with magnetic bearings

SVĚTLO (Light) 2/2017 was released on March 17th 2017. Its digital version will be available immediately.

Fair and exhibitions
Inspired lighting from foreign fairs 

Accessories of lighting installations
On lighting operation is possible to save with minimum investments
Maxos fusion – new Philips Quit assembling system
Inteligent solution Dalisys® for control lighting

Sound-proof metamaterial inspired by spider webs

12.09.2016 | Phys.org | www.phys.org

A team of researchers from Italy, France and the UK has designed an acoustic metamaterial (which is a material made of periodically repeating structures) influenced by the intricate spider web architecture of the golden silk orb-weaver, also called the Nephila spider.

By modeling different versions of the new spider-web-inspired acoustic metamaterial, the researchers demonstrated that the new design is more efficient at inhibiting low-frequency sound and is more easily tuned to different frequencies than other sound-controlling materials. Combined with the stiffening mechanical properties and the heterogeneity of spider silk, the tunable acoustic properties demonstrated here suggest that spider-web-inspired metamaterials could lead to a new class of applications for controlling vibrations. Possibilities include earthquake protection for suspended bridges and buildings, noise reduction, sub-wavelength imaging, and acoustic cloaking.

New acoustic metamaterial

The metamaterial is highly tunable because its geometry is defined by five parameters—which is more than traditional acoustic materials—and each of these parameters can be independently controlled to produce a vast number of designs that respond to different acoustic frequencies. The frequency range that is inhibited by these materials is called the band gap, and here the researchers showed that spider-web-inspired acoustic metamaterials can have wide band gaps, with large ranges of tunability.

Read more at Phys.org

Image Credit: M. Miniaci

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