NASA – The Twin Rectangular Jet model, installed on the Nozzle Acoustic Test Rig in the Aeroacoustic Propulsion Laboratory at NASA’s Glenn Research Center, is being tested to determine the acoustic impact of engine configurations on low sonic boom aircraft for the High Speed Project of the Fundamental Aeronautics Program.
The High Speed Project is a multi-center effort to develop and test the technologies of a new generation of aircraft that can fly at supersonic speeds. Glenn’s research involves predicting the airport noise of these novel aircraft by examining innovative airframes and propulsion integration that are different from the conventional tube-and-wing aircraft observed at commercial airports.
Inside the aeroacoustic dome, this generic, low-fidelity aircraft engine exhaust model features twin rectangular nozzles. Researchers are investigating the impact of having the propulsive exhaust come from the slot nozzles atop the aircraft. Testing the proposed components of these high- speed aircraft will help manufacturers meet the noise standards required around the nation’s airports.
Image Credit: NASA/Bridget R. Caswell
By Robert W. Wood – The lackluster IRS testimony so far suggests we may never know what happened, who did what, who knew, when they knew and worse. Confusion and Staff Troubles Rife at I.R.S. Office in Ohio.
Amid all the noise, many Americans should ask simpler questions:
- Why is the tax law so horribly complex?
- Can I feel secure that I will be dealt with fairly by the IRS?
- Doesn’t the IRS police its employees?
- Why does it seem that there’s always someone getting away with something in the tax world?
- Can I feel secure that my private taxpayer information will remain private?
- Why is staying off the IRS radar so important?
By W. Scott Fillebrown – The challenge is that the US market is made up of high-technology/low production quantity assemblies. In many circuit bed of nails cases, test is not an option because of development time, cost and the difficulty associated with finding a place for a 30-40 mil test point.
Depending on the technology, the challenge can be as simple as making minor design changes that can happen at the gerber level to requiring a significant revision to the board in question. First let’s conquer the simple. For analog, RF and lower technology digital boards the approach is the simplest. Typically, straightforward flying probe test is the answer. more> http://tinyurl.com/cdnzdlr
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