Noise-Cancelling Windows With Piezoelectric Patches

There's nothing like a nice, thick wall to shield you from noisy urban environments. Windows pose a real problem because of the way they transmit vibration.

"A window acts like a loudspeaker and a membrane. If you control the vibration of the window, you can control transmitted noise in such a way that it is not acting like a membrane or a loudspeaker," said Thilo Bein, Fraunhofer Institute for Structural Durability and System Reliability LBF in Darmstadt, Germany.

Simple expedients like using triple-pane windows can help, but they are expensive; it would be better to eliminate the vibration. Bein and his research team have developed a way to make a single-pane window damp out vibration by about fifty percent.


(Noise-canceling window)

Here's how it works. Stamp-sized patches of a piezoelectric ceramic are attached to the window at regular intervals; they are connected to each other and to a controller by fine wires. When a sound-generated vibration moves the window, the patches sense it.

The controller then delivers a specific electric charge back to the patches, causing them to vibrate at a phase that cancels out the sound vibration. In experiments, 90-100 decibel noise was reduced by fifty percent. Bein estimates that these windows would be commercially available within five years; the patches would be more fully integrated into the window (and hopefully transparent).

Science fiction writers of the 1950's were very concerned with noise reduction, apparently. For instance, in his 1957 story Silence Please, Arthur C. Clarke wrote about the Fenton Silencer:

It consisted of a microphone, a special amplifier and a pair of loud speakers. Any sound that happened to be about was picked up by the mike, amplified and inverted so it was exactly out of phase with the original noise. Then it was pumped out of the speakers, the original wave and the new one cancelled out, and the net result was silence...
(Read more about Clarke's Fenton Silencer)

SF fans will doubtless remember the hush corner from Heinlein's Double Star as well as the legendary cone of silence from Dune.

Via Discovery.

Scroll down for more stories in the same category. (Story submitted 5/1/2007)

Follow this kind of news @Technovelgy.

| Email | RSS | Blog It | Stumble | del.icio.us | Digg | Reddit |

Would you like to contribute a story tip? It's easy:
Get the URL of the story, and the related sf author, and add it here.

Comment/Join discussion ( 0 )

Related News Stories - (" Lifestyle ")

Nissan ProPILOT Slippers Are Self-Parking, Autonomous
Beyond science and fiction, that's what they are.

Seiko Astron Always Knows Your Time Zone
'Harrington glanced at his wrist watch - a bulky affair - and whistled.' - Robert Heinlein, 1940.

The Ring Clock IS Heinlein's Finger Watch
'Crayn glanced at his finger watch...' - HB Fyfe, 1951.

3D Printed Fashion - Plastirobes And Transdresses
'... dial a new fashion every day!' - Niven and Barnes, 1992.

 

Google
  Web TechNovelgy.com   

Technovelgy (that's tech-novel-gee!) is devoted to the creative science inventions and ideas of sf authors. Look for the Invention Category that interests you, the Glossary, the Invention Timeline, or see what's New.

 

 

 

 

 

Current News

A 'Genuine Nanorobotic Production Factory'
'Microscopic machinery, smaller than ants, smaller than pins, working energetically, purposefully - constructing something...'

Neuromorphic Computer Offers Non-von Neumann Architecture
Fires faster than brain at 1/10K energy.

Evorus Your Crowd-Powered Conversational Assistant
'...the DS [Daily Schedule] was suddenly transformed into a valued confidante.'

Mealworms Food Of The Future
Get your grubs on.

Alibaba's AI May Read Better Than You
'Mike ... could accept other languages and was doing technical translating - and reading endlessly.'

Musk's Boring Flamethrower
'Skeletons in tatters. Burned by a flesh gun'

Humanity Star LEO Advertisement?
'Everyone has noticed those enormous advertisements...'

Nissan ProPILOT Slippers Are Self-Parking, Autonomous
Beyond science and fiction.

Atomristors - Atomic Memristors - Using Thin Nanomaterials
'I could almost feel those little tunnel junction neuristors working, forming their own interconnections as I operated it.'

Bigelow Prepares Inflatable Lunar Hotel
'Suddenly, hitherto unheard-of sums of money became available for investment in civilian orbital stations.'

Drunk Driver Of Tesla Claims Autopilot Was In Charge
'Mr. Garden, you are in no condition to drive.'

Medical Exoskeleton From Cyberdyne Gets FDA Approval
It's been a long road for HAL-5; I started writing about it in 2005.

Fungi-Infused Concrete Repairs Itself
'I noticed that curious mottled knots were forming, indicating where the room had been strained and healed faultily.'

Shiftwear Display Shoes
'He unlaced her shoe and glanced at its readout.'

NASA SEXTANT First With X-Ray Nav In Space
'You need at least four beacons for an accurate fix.'

GM Introduces Cruise AV With No Steering Wheel
'How about the steering wheel?' ... 'I do not need one.'

More SF in the News Stories

More Beyond Technovelgy science news stories

Home | Glossary | Invention Timeline | Category | New | Contact Us | FAQ | Advertise |
Technovelgy.com - where science meets fiction™

Copyright© Technovelgy LLC; all rights reserved.