EricM9104 Posted September 20, 2008 Report Share Posted September 20, 2008 NASA Selects Term-LAB to Measure Shuttle LaunchNASA has recently selected Term-LAB to measure the Sound Pressure Level generated by the Space Shuttle during liftoff. According to NASA engineers, acoustical measurements during liftoff have not been attempted for more than a decade. And, even then, reliable measurements were difficult if not impossible to achieve due to the extreme nature of the SPL being produced. After researching the available test equipment on the market, Term-LAB was selected for this very demanding application. NASA plans to use the measurements recorded by Term-LAB to identify specific frequencies that could be causing damage to the pad during launches. The need for logged data required some significant additions and enhancements to the Term-LAB software. Wayne Harris, president of WHE Inc., worked closely with NASA engineers to develop these changes. The first measurements were taken during the launch of Discovery on May 31, 2008. The sensor was attached to a high-speed camera mount located 1300 feet from the launch pad. The Term-LAB system was switched to “NASA Mode” and the data logger began logging measurements to the computer’s hard drive several minutes prior to liftoff. The logged data was then reviewed by NASA and WHE Inc. Based on this data, the shuttle established a peak “dB Drag” SPL of 147.7 dB at 20 Hz. While a score like this won’t set any dB Drag Racing World Records, it is very impressive when you consider that the measurement was taken from 1300 feet away and that the frequency where the maximum SPL occurred was 20 Hz. http://www.termpro.com/hnews/newsdetail.asp?ID=69 Quote 2015 Honda Civic LX 4dr | 24k miles Stock H/U and mids/highs Power Acoustik GW3-12" D2 Sub HiFonics BXX1200.1D @ 1ohm Random 2.5^3' dual ported box NVX LOC Stinger wiring throughout 1977 Chevy SWB Cammed 350 Dual exhaust Cheap Wish stereo Link to comment Share on other sites More sharing options...
ptcary Posted September 20, 2008 Report Share Posted September 20, 2008 That's badass! A shuttle launch is widely considered to be one of the loudest things on earth! Definitely something I want to watch in person in my lifetime! 147 db at 20 hz and 1300 ft from the source! Quote PTCary 2003 SMD PT Cruiser 2011 Honda CBR 250R 2010 Mazda 3i Sport MY BUILD LOG Link to comment Share on other sites More sharing options...
Toxiccasper Posted September 20, 2008 Report Share Posted September 20, 2008 good now maybe then can update all those DB charts in science books Quote Link to comment Share on other sites More sharing options...
roscoe1129 Posted September 20, 2008 Report Share Posted September 20, 2008 Damn! thats alot of DBZ from 1300ft!!!! Quote Some people need a sympathetic pat... on the head...with my hammer Scientia est Vox "In Nomine Patris et Filii et Spiritus Sancti" DONT BE AFRAID TO USE THE SEARCH BUTTON!!! SMD SUPER BUYER/SELLER Link to comment Share on other sites More sharing options...
Eric B Posted September 20, 2008 Report Share Posted September 20, 2008 Wonder what it was at the source 160+ at 20Hz? maybe 170? yikes... Quote 2007 Chevy HHR LT UNDER CONSTRUCTION 1st Place Loud N Low 2010 MWSPL Finals 3rd Place Xtreme 3 2010 MWSPL Finals Link to comment Share on other sites More sharing options...
Forevrbumpn Posted September 20, 2008 Report Share Posted September 20, 2008 it was 160db before from the same distance, using a BK meter, last I heard dont know if it was 1300ft on the dot, but it was 160db on the previous mic 147db @20hz would be pretty funny to get a taste of Quote I have a ritual called "terminator". I crouch in the shower in the "naked terminator" pose. With eyes closed I crouch for a minute and visualize either Arnie or the guy from the 2nd movie. I then start to hum the T2 theme. Slowly I rise to a standing position and open my eyes. It helps me get through my day. The only problem is if the shower curtain sticks to my terminator leg. It sorta ruins the fantasy. Link to comment Share on other sites More sharing options...
Sampsonite Posted September 20, 2008 Report Share Posted September 20, 2008 JESUS 147 @ 20htz 1300 Feet away!! Thats LOUDER than my shit @ 49htz ON THE DASH Quote --Sampson 816-591-6592 www.kcrimshop.com Link to comment Share on other sites More sharing options...
alvitae Posted September 20, 2008 Report Share Posted September 20, 2008 (edited) My memory is about as long as my D@#$, But wasn't there a post about some meter that used the metal box as the mic because the metal was sensitive to pressure diffs. And you had to put a dmm on the metal box? I thought in the thread the rep said that is what nasa used because it had a huge upper limit and was super sensitive. Edited September 20, 2008 by alvitae Quote Link to comment Share on other sites More sharing options...
reinke Posted September 20, 2008 Report Share Posted September 20, 2008 i ised to live like a mile from where they launched the shuttle. i could hear it from my back patio. Quote ----reference's---- meade916 Link to comment Share on other sites More sharing options...
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