X-59 Quesst tested over many U.S. cities.

50 years ago, congress banned civilian supersonic flight over the U.S. area. The reason for that ban was a sonic boom, that broke windows. Today NASA and Lockheed Martin work to decrease the sonic boom effect in the X-59 Quesst program. The idea is to make an aircraft, that creates a very tapered pressure cone behind the plane. That shape maximizes the time a pressure wave uses. When it travels from the airplane to the ground that air has time to release its energy.

NASA tested X-59 over many U.S. cities. The purpose of those tests is to test if the aircraft alarms people. The same technology, developed for X-59 can apply to use in far faster hypersonic aircraft. And one thing that slows the hypersonic aircraft development is the sonic boom.

And that makes supersonic flight quieter than ever before. This kind of body and wing geometry makes it possible to create SST that will not break windows on the ground. The X-59 program allows to make the a new type of supersonic aircraft, that is silent and also stealthy. This kind of system is needed also for the next-generation military aircraft. The low-noise systems allow military jet operations from the airfields.

If the jet fighters use low-noise technology, they don't wake the entire city, when those systems operate. One way how to suppress the engine noise is the counter-voice system. Those systems press the engine noise to a thin cone if they are in the aircraft body. The idea is that the exhaust gas travels in a tornado, created by coherent sound waves.

Those soundwaves could lock the sound, or pressure waves inside them. If that system is installed on the airfields, the loudspeakers push the noise back, and that should decrease their voice. The high-power loudspeakers can also operate as part of the airfield security systems.

https://www.nasa.gov/mission/quesst/

https://nationalinterest.org/blog/reboot/lockheed-martin%E2%80%99s-supersonic-x-59-could-transform-everything-188425

https://scitechdaily.com/nasas-x-59-quesst-overturning-the-50-year-old-supersonic-speed-limit/

https://en.wikipedia.org/wiki/Lockheed_Martin_X-59_Quesst

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