Jetoptera has carried out a sequence of assessments to measure the noise signature of its patented 200 lbf- class Fluidic Propulsive System (FPS™) thrust augmentors as a subcontractor to Paragrine Techniques, below a United States Division of Protection-funded analysis collaboration.
The testing in contrast the Jetoptera FPS™ to a standard reciprocating engine-driven propeller propulsion system and located an as much as 15 dBA decrease General Sound Strain Degree (OASPL) output based mostly on equal energy and earlier than software of any extra noise mitigation applied sciences. Acoustic therapy will enhance its benefit to greater than 25 dBA OASPL over a rotor on an identical energy foundation.
The assessments had been carried out as a part of Paragrine’s improvement of superior parafoil platforms with extremely environment friendly, low-noise propulsion as an necessary goal. Jetoptera has been chosen for this system due to FPS’s maturity and distinctive potential for integration into modern propulsion system configurations. This spherical of testing evaluated an FPS geometry whose aerodynamic efficiency Jetoptera has beforehand demonstrated on a 7-meter wingspan unmanned plane used as a flight testbed, in a number of VTOL and hovering flight assessments, and within the College of Washington wind tunnel.
Optinav, Inc., carried out the acoustic analysis through the use of its BeamformX Acoustic Array System, which is a complicated instrument that exactly and precisely measures emitted sound profiles and pinpoints the exact sources of audible vibration for actionable options. The info evaluation was carried out by Dr. Robert Dougherty, whose scientific contributions had been not too long ago acknowledged by the AIAA with the Aeroacoustics 2020 Award.
Along with testing the FPS, the identical setup and process was utilized to a 11-kW inside combustion engine-driven 1.25-meter diameter propeller turning at most RPM with a ensuing blade tip velocity of Mach zero.46. Broadband and narrowband noise measurements had been carried out with directivity decision. The take a look at outcomes present as much as 15 dBA decrease noise efficiency of the FPS™ versus the propeller, earlier than any FPS™ noise abatement, based mostly on equal energy stage. With the information collected and contemplating the directivity and atmospheric absorption regular day, we are able to now predict that at 300 meters the FPS™ would produce lower than 50 dBA even earlier than abatement therefore, considerably decrease than the 65 dBA purpose of UAM communities. The FPS would be the most silent propulsor within the skies.
“In contrast to a propeller, the FPS™ can take non-round shapes for excellent integration with the wing and due to this fact is extra amenable to additional noise abatement through passive and lively acoustic abatement methods. The staff utilized a way of putting the thrusters inside varied enclosures which additional lowered noise emissions by one other as much as 5 dB, at a modest value to the thrust efficiency” stated Dr. Andrei Evulet, CEO of Jetoptera. “This can be a very vital decrease noise emission stage in comparison with any propeller system, on a similar thrust score comparability, because the inevitable tonal noise from the propeller or rotor dominates the acoustics of such a legacy system, be it electrical, piston or turbine-driven,” he continued.
“We’ve got simply demonstrated how our propulsion technique can be quieter by a major margin, even earlier than we incorporate abatement strategies. We additionally in contrast the aeroacoustic knowledge collected to the noise signature of some superior propellers which were developed and reported prior to now 5 many years by NASA and others and the FPS™ was discovered to have the potential to be as much as 20 dB decrease and having no tones, a bonus that can’t be matched by any rotor or propeller. Our subsequent steps embody using the FPS™ along with an Higher Floor Blown (USB) Wing, which can additional cut back the noise ranges, as NASA research have confirmed over a number of many years of analysis.”
Jetoptera thanks Paragrine Techniques, LLC, who made this acoustic analysis take a look at potential. We sit up for advancing our collaboration and our distinctive mixture of applied sciences.
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