advertisement

TOROID

50 %
50 %
advertisement
Information about TOROID
Science-Technology

Published on November 3, 2008

Author: acoustics101

Source: authorstream.com

advertisement

The Toroidal Whistle : The Toroidal Whistle by Rick Weisenberger Background of the Invention : Background of the Invention In the past, whistles were loud but very inefficient devices for producing sound. Part of the problem was that they were designed to operate at high (150 PSI) pressure and also required large flow rates of approx. 100 CFM per inch in diameter. Toroidal whistles still require large flow rates, but operate efficiently at only 15 PSI. A toroidal whistle operates as a very large phased array of conventional cylindrical whistles. The Prototype Test : The Prototype Test Click left mouse button on video to play What is a Toroidal Whistle? : What is a Toroidal Whistle? Plain toroidal whistle : Plain toroidal whistle What is a toroidal whistle? : What is a toroidal whistle? Horn loaded inverted toroidal whistle driver section : Horn loaded inverted toroidal whistle driver section Horn loaded inverted toroidal whistle : Horn loaded inverted toroidal whistle What are the advantages over Sirens? : What are the advantages over Sirens? A siren produces not only the fundamental (operating) frequency, but a rich spectrum of harmonics as well. At close range, these harmonics occur at levels and frequencies most injurious to hearing, however they contribute very little to overall level in the far field, as these frequencies are most attenuated by atmospheric absorption. As a result, sound levels fall off quicker than predicted by the inverse square law alone. Fighting Paradigm Paralysis : Fighting Paradigm Paralysis Since the 1940s, sirens and air horns have replaced whistles as the prime long range sound signal, due to their much higher operating efficiencies. The conversion efficiency of a plain toroidal whistle compares favorably to that of an air horn, while the efficiency of a horn loaded inverted toroidal whistle compares with that of a siren or even that of the new high powered electronic warning devices. Applications for Toroidal Whistles : Applications for Toroidal Whistles A toroidal whistle is by nature a very efficient high power sound signal, as it operates as a large phased array of conventional cylindrical (steam) whistles, but at approx. 1/10 the pressure. At a pressure of only 15 PSI a 20” diam. Toroidal whistle produces an SPL of 125 dB @ 100 ft. A horn loaded inverted toroidal whistle uses 25% less airflow, but can produce an SPL of 135 dB @ 100 ft. Finally-A Warning that will reach the Public : Finally-A Warning that will reach the Public As we all know, although the largest sirens are near field rated as high as 135 dB @ 100 ft. most warning sirens simply cannot be heard indoors at a great distance. This is due to much of their output at upper harmonics trying to heat the air around them. A 135 dB rated siren is down to approx 70 dB at under 10,000 ft. The 125 dB @ 100 ft. toroidal whistle prototype was still producing 76 dB at 2 miles! Introduction to the Market : Introduction to the Market The next step is to introduce a working model of the horn loaded inverted toroidal whistle to the public by having one built and installed where it can be demonstrated. Its far field performance will amaze any DES official familiar with the performance limitations inherent in the present system of warning sirens. Slide 14: For further information on the technology behind the toroidal whistle visit my webpage at http://rjweisen.50megs.com

Add a comment

Related presentations

Related pages

Toroid Technology

Toroid Technology produziert in der Tschechischen Republik, die sich durch niedrige Lohnkosten auszeichnet, und ist ...
Read more

Torus – Wikipedia

Ein Torus (Plural Tori; von lateinisch torus „Wulst“) ist ein mathematisches Objekt aus der Geometrie und der Topologie. Er ist eine „wulstartig ...
Read more

Toroid Corporation > Home

Whether you need 1 piece or 20,000, a 20VA transformer or an 18,000VA transformer, let Toroid assist you with your transformer needs. Learn more
Read more

dict.cc | toroidal | Wörterbuch Englisch-Deutsch

Übersetzung für toroidal im Englisch-Deutsch-Wörterbuch dict.cc. ... Unter folgender Adresse kannst du auf diese Übersetzung verlinken: http://www.dict ...
Read more

Toroid - Wikipedia

In mathematics, a toroid is a surface of revolution with a hole in the middle, like a doughnut. The axis of revolution passes through the hole and so does ...
Read more

Abhijit Menon-Sen - toroid

Abhijit Menon-Sen. My journal (and other writings) Software I've written; My résumé. Birds and bird-watching; Guided bird-watching tours; Photographs. I ...
Read more

Toroidal inductors and transformers - Wikipedia

Toroidal inductors and transformers are inductors and transformers which use magnetic cores with a toroidal (ring or donut) shape. They are passive ...
Read more

toroid - Deutsch-Übersetzung – Linguee Wörterbuch

Viele übersetzte Beispielsätze mit "toroid" – Deutsch-Englisch Wörterbuch und Suchmaschine für Millionen von Deutsch-Übersetzungen.
Read more

Using Git to manage a web site - toroid.org

Using Git to manage a web site By Abhijit Menon-Sen 2008-12-17 The HTML source for my (i.e., this) web site lives in a Git repository on ...
Read more

Magnetics - Ferrite Toroids

Hardware, such as toroid mounts and headers, is available. Learn More. Key Characteristics. Composition: Mn • Zn • Fe; Shapes: Toroid; Sizes: 3 mm to ...
Read more