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Please Welcome New Moderator: RickS

Some of you have been asking how we evaluate people for moderator role. Thought I post this video of Rick being interviewed instead of explaining it in words:

 
amirm said:
how we evaluate people for moderator role.
Click to expand...

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@AdamG

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@Jimbob54

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@RickS

;) :cool:


JSmith
 
amirm said:
Some of you have been asking how we evaluate people for moderator role. Thought I post this video of Rick being interviewed instead of explaining it in words…
Click to expand...

Lol, after that interview, should know I really closed the deal by making a big plate of sushi for Amir while blasting The Warning on my CBTs…


Now you know what it really takes to become an ASR moderator.;)
 
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Welcome! Nice to see new moderators to help keep this place as good as it is
 
Congratulation from France @RickS

Your new listening room is almost ready !

Habu

IMG_6371.jpeg
 
Last edited:
Todd k said:
What is that room? Where is that? Wonder where the main listening position is, on top of a ladder?
Click to expand...
Hi Todd K
The main listening position is outside the room, otherwise with 163 dB you can’t listen anything anymore….
Habu

Source: https://en.wikipedia.org/wiki/Space_Power_Facility
The Reverberant Acoustic Test Facility has 36 nitrogen-driven horns to simulate the high noise levels that are experienced during a space vehicle launch and supersonic ascent conditions.
The RATF is capable of an overall sound pressure level of 163 dB within a 101,500-cubic-foot (2,870 m3) chamber.
 
Habu said:
Hi Todd K
The main listening position is outside the room, otherwise with 163 dB you can’t listen anything anymore….
Habu

Source: https://en.wikipedia.org/wiki/Space_Power_Facility
The Reverberant Acoustic Test Facility has 36 nitrogen-driven horns to simulate the high noise levels that are experienced during a space vehicle launch and supersonic ascent conditions.
The RATF is capable of an overall sound pressure level of 163 dB within a 101,500-cubic-foot (2,870 m3) chamber.
Click to expand...
So no music. What a shame. Was really curious when I saw the picture and deduced it was not for music. Thanx for the reply and explanation. 163db mite piss off the neighbors.
 
Astoneroad said:
They ripped off the idea from Grateful Dead's "Wall of Sound" circa 1973....
Click to expand...

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The RATF chamber is located within the Vibroacoustic Highbay, taking advantage of the 1.8 m (6 ft)thick surrounding concrete walls to help attenuate sound migration through the SPF. The highbay alsoserves as redundant protection from the RATF nitrogen atmosphere during operation. The RATF is a2,860 m3 (101,189 ft3) reverberant acoustic chamber capable of achieving an empty-chamber acousticoverall sound pressure level (OASPL) of 163 dB. The facility structure is designed for a future upgrade to166 dB OASPL, including areas in the horn room wall which have been left blank for future installationof additional modulators/horns. The RATF includes various supporting sub-systems including gaseousnitrogen generation system, horn room with acoustic modulators and horns, acoustic control system, andhydraulic supply system. Test articles are mounted onto elevated customer-provided mounting fixtures fortesting. The chamber has been constructed with load-bearing wall attachments for future installation of a5-ton interior bridge crane. The chamber can be operated as a Class 100,000 clean room once the accessdoors are closed and the facility is cleaned. The combinations of servo-hydraulic and electro-pneumaticnoise modulators utilize gaseous nitrogen capable of producing a tailored wide-range of acousticspectrums in the frequency range from 25 to 10,000 Hz. The RATF chamber internal dimensions are11.4 m (37.5 ft) wide by 14.5 m (47.5 ft) deep by 17.4 m (57 ft) high.A photograph of the RATF horn wall is shown in Figure 5, and overall chamber is shown in Figure 6. A maximum of 19 control microphones can be placed around the test article for closed-loop controlusing the Acoustic Control System (ACS). The ACS, control microphones, or other responseinstrumentation (accelerometers, microphones) may be input into the Analog Abort System (AAS) toprovide automatic shutdown capability. Each of twenty-three (23) servo-hydraulic acoustic modulators iscoupled with individual horns of six different cut-off frequencies. Each of thirteen (13) electro-pneumaticacoustic modulators is coupled with individual horns of one cut-off frequency. This combination ofmodulators and horns provides for an extremely variable and tailored acoustic spectrum. Threaded insertsare located in the floor for attachment of test article mounting fixtures.The East side of the chamber has a large rolling door and hinged door to provide access to thechamber up to 10.5 m (34.5 ft) in width. A 5.5 m (18 ft) wide by 4.2 m (14 ft) high door is located on theWest side of the chamber for loading equipment when the vacuum chamber is occupied.The Vibroacoustic Highbay is secured and support systems (hydraulics, compressed air, liquidnitrogen, gaseous nitrogen, HVAC systems, and video systems) are setup and energized. A watchdogFacility Control System (FCS) monitors these sub-systems and ensures that all permissives and interlocksare verified. The acoustic chamber is filled with a predetermined level of gaseous nitrogen. The FCSverifies that a matching modulator selection file agrees with the ACS and subsequently provides a RunPermit to the ACS. The ACS performs a self-check and the operator initiates testing using the tailoredchoice of modulators/horns. The nitrogen generation system automatically vaporizes liquid nitrogen intogaseous nitrogen as required up to 1,981 standard cubic meters per minute (70,000 scfm). At theconclusion of testing, fresh air is force-ventilated into the chamber via the HVAC system to purge thechamber of nitrogen for safe entry. Temperature, humidity and oxygen monitors are located in thechamber and highbay.Data is acquired at the RATF via the Facility Data Acquisition System (FDAS), a 1,024-channelhigh-speed digital system.The RATF has been tested up to a maximum OASPL of 161 dB, and is currently undergoingcharacterization checkout testing in preparation for customer testing in early 2013. The following arevarious characteristics of the acoustic facility.Parameters:Team Mk VI modulators: 12Team Mk VII modulators: 11Wyle WAS5000 modulators: 13Horns: 36Max. Empty-chamber SPL: 163 dB OASPLFrequency Range: 25 Hz to 10 KHzPhysical Characteristics:Chamber Dimensions: 14.5 by 11.4 by 17.4 m (47.5 by 37.5 by 57 ft H)Chamber Volume: 2,860 m3 (101,189 ft3)Crane Capacity: 18,143 Kg (40,000 lb)Floor Loading: 54,422 Kg (120,000 lb)Blank Penetrations: 25 at 0.15 m (6 in.) dia.2 at 0.20 m (8 in.) dia.
 
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