Monday, March 14, 2011

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Updated UNE relationship related to acoustics and vibration published in the BOE, processed in November 2010 and published by the Directorate General of Industrial Development, under Ministry of Industry, Tourism and Trade.

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The English Association for Quality Acoustics, Aecor, continues its series of enhancements to its associated service by creating a new platform in its new bulletin board system website, www.aecor. is . Partners can apply for professional and business opportunities in companies associated with the association fosters a better internal communication within the sector, especially in these times when recession and unemployment figures remain high and there needs to Channel smarter and faster.

The new job board is within the great renewal experienced by the forum system, which seeks to not only constituted as a handy tool for finding information related to the sector, but it allows communication among professionals in the field of acoustics. From the management and administration are moderated Aecor various discussion forums on technical and environmental aspects related to acoustics.


Aecor offers an important and timely information on developments work in the sector, information on courses, acoustic instrumentation, noise pollution, national legislation, regional and foreign and domestic advisory work among partners, which becomes another engine within the association.


The forum has established itself as an element of added value, to improve and increase services offered and making more available all the information of the association, serving as a reference for all those partners who want to delve into specific issues environmental and building acoustics.

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From March dBA sound opens its new customer service office in the capital of Granada, on Calle Gran Capitán. Thus dBA, noise creates a new link with partners and customers.

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UNE processed from March to October 2010 Published

The hotel industry in the city of Murcia will begin on February 14 a campaign against night noise caused by people leaving to smoke in the nightlife spots in town. The title of this campaign is "Have fun without disturbing", and will consist of placing stickers on the visible areas of the bars the door warning customers to respect the rest of the neighbors. These stickers are also placed in other locations such as payphones or panels.

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The prosecution has asked for up to five years in prison and 47,000 euros compensation to residents affected by noise from a local for a drink in Alhedín. This offense would be leading from 1994 to 2008, which have led to psychological problems in those affected.

Measurements made on the premises recorded 52.6 decibels, when the maximum is 43.9.

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UNE-ISO 21930:2010

The March 11, 2010 was a great day for the residents of Valencia and Xirivella. The first plane took off into the sea in the morning went off a few meters to the south two miles after takeoff from Manises and thereby prevent fly over the houses in the neighborhoods of San Marcelino and San Isidro. That day came into force a route Aena studied for months to cause as little inconvenience to the residents of both cities. A year later, however, that path that has so benefited the rest of the neighbors will be canceled.

Within ten days, as reported by the state company technicians to municipalities affected by noise from the Manises airport, the route will take off before the 11 March. It will be a temporary change that will last about four months, and coincides with the increase of flights from the end of March will occur with the new routes during the summer season.

The reason given Aena to return to the past is to replace the current system of radio navigation aids air by one of last generation. This technology allows pilots to follow a preset route flight, while not actively require aircraft to use the old path off the straight line, and that flies thousands of homes and neighborhoods Xirivella south Valencia.

technicians did not think the seven municipalities that attended yesterday's meeting, convened by Aena, which they had prepared this surprise. At the tenth meeting of the Technical Working Group on Noise, after complaints from City Council Valencia, Aena has decided to ask to enable a telephone number that will be available on the web to be the public company which "inform the public directly about the situation."

Noise Pollution Councilwoman of the City of Valencia, Lourdes Bernal, said yesterday that it is a "good news for the neighbors, since we have spent many years fighting to ensure that planes do not dare the city risks involved and the noise they generate. " For now, it had only managed to approve the change in take-off path, and still is to advance route changes following the aircraft for landings.

Yes there has been progress, however, launch a new application, which is viewed through the Aena website paths of aircraft and the noise level in a particular location.
its meeting held yesterday, and the technicians who were called the consistory of Valencia, Manises, Xirivella, Quart de Poblet, Mislata, Ribarroja and Aldaia, Aena said that this new application will allow to view Movimas aircraft and reported data as code, altitude or type of aircraft, although 30-minute delay for security. Recorded data will be available by the noise monitoring system installed around the airport during the past 45 days, and even select a location for the system to calculate the distance that separates him from any plane that passes through there.
This system, already in force at the airport Barajas and El Prat, will also allow residents to file claims or complaints to the routes of the aircraft. In this regard, the council of noise made it clear that the City Council "will be followed up to confirm their implementation, as it is important to residents suffering from aircraft noise. "
Aena
technicians also reported that in the coming months will be subject to public consultation and information "noise easements Manises airport and associated action plan." This action, according to Aena, "will clearly benefit the residents concerned and that the easements are established definitively associated with the actual activity of the airport." That is, there will be a larger number of neighbors who have the right to isolate him his home, since the last study on the condition of the planes was calculated before the extension the airport and when the number of flights was much lower than the current.

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Brüel & Kjær adds a new array of microphones to the widest range of equipment for measuring acoustic holography market. This is an array of 30 microphones pentangular low cost (model 4949) with a diameter of 3.5 meters.

The system has a camera in the center of the array and its arms can be oriented at 0 ° or 30 ° to the plane of acquisition. The main applications are the localization of sound sources at a distance or large areas (factories, wind turbines, trains ...).

Like other applications of acoustic holography, this array using the PULSE system and equipment acquisition. In this way the user not only has a tool designed to locate sources of noise if no access to the platform complete acoustic and vibration market.

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Tidoni Davide is a visual artist and sound very interesting for an acoustic. I leave you with two of their last jobs.

The first is different signals that make us see we're in an interesting sound. Each sign represents the interaction that takes place in an architectural space with sound that can occur. The human figure suggests the point where it should locate to listen.

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I think our city should be full of these signs, and there are many sites with reverb, galleries whispers, echoes and reflections curious. We would be more aware of how sounds behave and sound spaces give us information about our environment.

This second job you can see and hear what is called a flutter echo . Sound waves trapped between two parallel walls and how to go over and over again the same space are deformed. We could say that the wave is trapped between the smooth reflective surfaces and reflected energy is coming to create a different sound than originally issued. And change because they interfere with certain frequencies and canceling others interfere joining in the different reflections that occur.



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Bizkaia Provincial Council over noise barriers installed in the A-8 as it passes through

www.acusticaweb.com

That Hollywood reinterprets the reality and what we are clear, but we like. Although the silence the sound of a gun with a rolled towel or put a pad in front of the barrel as does Toni Soprano, the acoustic cast us not ever.

The noise level of a shot gun without a silencer is around 140 or 160 decibels (which can cause permanent damage to the ears), while if you put a silencer, the noise decreases only up to 120 or 130 decibels . This noise is equivalent to a jackhammer (able to cause you damage your hearing if you're close enough).

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need to reduce the length of muffler sound. It's pure physics, but can make some tweaks to increase capacity.

The shot noise comes from three different causes:

  1. The detonation, which is the combustion of gunpowder and is the main noise. That is eliminated or reduced with the use of silencers.
  2. The breaking the sound barrier . For this subsonic ammunition is used and integrated sonic suppressants. The
  3. automatic weapon. They are metal parts that move and make noise.

Using a supersonic ammo silencer reduces the sound but not apaga.Usar subsonic without silencer reduces the sound too, but it would be best to use subsonic ammunition with a silencer.


I leave you with a couple of videos to illustrate the topic.




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In the sixties, the U.S. arranged a series of powerful underwater microphones (hydrophones) at strategic points in the Atlantic and Pacific oceans, to several hundreds of meters deep. The spy network called SOSUS submarine hearing, Sound Surveillance System. His mission was to "hear" the passage of Soviet submarines by these oceans and to alert the U.S. Navy. Currently still remains the network of hydrophones but at the end of the Cold War, declassified the project and allowed its use to scientists, biologists, oceanographers, etc.

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The Bloop sound spectrogram

Throughout the nineties and even today, occasionally fail to capture these scientists and record sounds of unknown origin that can be located thousands of meters deep . It has been dubbed the most famous of them as "The Bloop " because it is more like onomatopoeia recorded sound. Some of these sounds are believed to be caused by underwater earthquakes and volcanoes and has not yet been reach abyssal depths, where the ocean floor a much larger mystery to scientists than outer space. But some of these sounds challenge the knowledge accumulated by scientists to date.

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Location sound


Christopher Fox of the U.S. National Oceanic and Atmospheric Administration's Acoustic can you tell if a sound is produced by a living being by a series of marks "on the sound . Some of these unfamiliar sounds recorded by the system SOSUS seem to have a biological origin, but more mysterious is that, judging by the intensity of sound recorded by sensitive hydrophones located at large distances between them, which captured the sounds and allowed them to locate the source, it follows that, if sounds produced organically should be a giant sea creature, much bigger than a whale .
Monitoring Project in Portland, said the sound waves are like fingerprints:


is exciting as it was then strong comeback the romantic idea of \u200b\u200bthe existence of sea monsters and the kraken in this world and almost lost his sense of wonder about the unknown. Some even venture to name the Cthulhu himself, as some of the recordings were located near the area where the horror story writer HP Lovecraft placed the mythical R'lyeh, the sunken city where sleep this being immortal who came to Earth from the stars long before the appearance of life on the planet, hoping to reimpose his reign of nightmare and madness.

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less fun
Another hypothesis is that it also could be sounds produced by shock, friction, cracks and dips of large icebergs . These sounds can be caught the so-called deep sound channel, an area of \u200b\u200bdeep underwater where the pressure and water temperature cause the sound to be trapped and can travel thousands of miles without dissipating horizontally vertically. But what we know now, it could also be not previously recorded sounds produced by animals known to drastically alter their behavior may sound (read the post " A seals would like Pink Floyd).


You can hear some of these unfamiliar sounds of the deep online and judge yourself but I'm trying to memorize the following verse in case I needed in the future: ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn.


Jordi Casadevall

The Bloop You can hear in this video

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Updated