11/22/2023 0 Comments Low subsonic speed nasa![]() Ideally, deviations in the noise on the ground should be small when perturbations in operating and atmospheric conditions are encountered during flight tests. The second challenge involves uncertainty quantification for the noise signature of the aircraft. This new optimization capability allows the engineering team to pick a target loudness level and automatically obtain control surface settings that achieve the specified loudness. The team worked with their counterparts at NASA Langley to couple the Cart3D optimization framework with the sBOOM atmospheric propagation software. ![]() First, the team is optimizing the aircraft’s control surfaces to mitigate the noise on the ground. In preparation for the X‑59 test flights, the Cart3D team developed new capabilities that address two challenges. The space marching code requires vastly fewer resources compared with CFD coupling them together reduces the processor hours needed to compute a simulation by half. To help reduce the computational resources needed for these simulations-and thereby reduce the cost of developing the flight planning tool-the LAVA team developed a space marching technique within the LAVA framework that can be coupled to the CFD to significantly reduce the computational domain. Project DetailsĬreating the database requires thousands of complex simulations with hundreds of millions of degrees of freedom, each requiring thousands of processor hours to complete. Researchers at NASA’s Ames Research Center are using the agency’s Cart3D and Launch Ascent and Vehicle Aerodynamics (LAVA) flow solvers to build a database of thousands of high-fidelity computational fluid dynamics (CFD) simulations that will be used as the basis for developing the flight planning tool. To achieve this, NASA’s Commercial Supersonic Technologies (CST) project is developing new flight planning software that will tell pilots how to fly the aircraft to achieve a target loudness level. Furthermore, it must be able to fly at a target loudness level across a wide range of locations and atmospheric conditions. The most critical requirement of the X‑59 is that it must fly at supersonic speed without creating an objectionable sonic boom on the ground. The Federal Aviation Administration (FAA) and International Civil Aviation Organization (ICAO) will use this database to set noise level requirements for supersonic flight over land, which is currently banned due to the nuisance caused by sonic booms. NASA’s X-59 Quiet Supersonic Transport (QueSST), an advanced low-boom aircraft concept developed to emulate and test the noise generated by future supersonic transport vehicles, will be used to perform community response testing across a variety of environments and locations to build a database of noise levels and acceptibility metrics. And about 54 minutes into it, Josh Brost (Account Manager, SpaceX) explains a bit more of what SpaceX is currently doing, too.Preparing the X-59 Quiet Supersonic Transport Aircraft for Flight Overview In that same video, about 21 minutes into it, Michelle Munk (Principal Investigator for EDL, NASA LaRC) also describes NASA-SpaceX cooperation on Supersonic Retropropulsion (SRP) and what NASA is getting out of it, not only the other way around. To pay it forward a bit, NASA also does such test of VTVL and ALHAT (Autonomous Landing Hazard Avoidance Technology) technologies with test flights, recently for example with Project Morpheus that is interestingly explained by Jon Olansen (Manager, MORPHEUS Project, NASA JSC) in this video from ExploreMars' 2015 Humans 2 Mars conference, roughly 23:30 into it. Tests wereĬonducted at several orientations and speeds ranging from Mach numbersĠ.3, or 228 miles per hour at sea level, to Mach 5, or 3,811 miles per hour at sea level, to gauge how the first stage reacts during the Provide SpaceX with test data that will be used to develop a re-entryĭatabase for the recovery of the Falcon 9 first stage. In the wind tunnel test facility on the Falcon 9 first stage to Under a Reimbursable Space Act Agreement, Marshall conducted 176 runs According to this article on from May 2012 : This test ( F9R 1000m Fin Flight) included all aerodynamic control surfaces that a Falcon 9 first stage would use.īut, for deceleration to subsonic regime, which these F9R Dev test flights don't yet include, SpaceX is being helped by NASA and there have indeed been wind tunnel tests (176 runs) done in NASA's Marshall Space Flight Center.
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