Ought to we be utilizing completely different bearings for our high-speed rotor blades that are used on the most typical drone sorts just like the Quadcopter designs? I imagine so, as these drones must be very dependable, lengthy vary, and could have essential cargo onboard as a part of their essential missions whether or not on the battlefield, industrial utility or delivering you a vital pizza or Amazon package deal.
Not way back, I used to be listening to an attention-grabbing NASA podcast on rotorcraft air bearings and foil bearings:
NASA Aeronautics Analysis Technical Seminar Podcast Collection:
“Technical Seminar 16: Oil-Free Turbomachinery Know-how for Rotorcraft Propulsion and Superior Aerospace Propulsion and Energy 1:14:33 11/24/2008. Oil-Free Turbomachinery Know-how for Rotorcraft Propulsion and Superior Aerospace Propulsion and Energy”
This bought me considering that not solely is that this related to right now’s navy plane, area flight propulsion, future jet engines, but additionally related for high-speed little motors that spin properly over 10,000 RPM. If we would like these motors to final and if there are a number of motors per flying craft; MAV – Micro Air Automobile, UAS – Unmanned Aerial System, or PFC – Private Flying Craft (Air Taxi) then it is smart to make use of such expertise.
You see, I used to be considering that it will certain be good to lighten-up the motors on such future VTOL (vertical take-off and touchdown) plane idea designs since there are sometimes Three-Four motors or extra. Among the advantages are very apropos MAVIC 2 PRO:
1.) Practically Upkeep Free Bearing Meeting
2.) Diminished Weight
Three.) Extra even friction warmth
It is a superb factor as a result of geometry and weight distribution that Quadcopters have. Decrease weight means extra payload, much less gasoline and/or longer vary.
Maybe the load financial savings of lube oil, (2-types wanted in regular present helicopter expertise) on every of the 4 motors might additionally give weight area for electromagnetic bearings with a thrust bearing mixture across the outer ring on the rotorblades to regulate vibration and free-wheel freed from drag, and simple begin. If the motors occur to be electrical, even higher on this case. If excessive velocity fuel generators we save weight and add security to a virtually upkeep free design.
Among the NASA assessments have concluded 60,000 hours with no harm or want to interchange elements or bearings. For a rotorcraft that is practically unparalleled as a result of harsh setting they fly and the truth that the motors are beneath so vital load on a regular basis the plane is airborne.
Now then, for the outer meeting – extra security is garnered by outer bearings, however lowered friction is the important thing, thus, electromagnetic system is smart, however as a consequence of weight maybe not 100% magnetic. This text explains the idea of Thrust Bearings and the combos I suggest we make use of.
“Design, Fabrication, and Efficiency of Foil Gasoline Thrust Bearings for Microturbomachinery Purposes,” by Brian Dykas, Robert Bruckner, Christopher DellaCorte, Brian Edmonds, and Joseph Prahl. (NASA/TM-2008-215062, January 2008; GT2008-50377).
At the moment, we all know that the quadcopter design might be one of the crucial secure designs but, however most quadcopters are solely toys, small drones, and have a restricted payload. If we would like these kind of designs to fly round folks, heavy weight, or turn into our future flying automobiles and air taxis, commuter shuttles, we’ll want close to 100% security, which means present rotorcraft parts might not be viable. Please take into consideration the long run, perhaps you may have a flying automobile in any case?
*Extra Cites to Take into account When Evaluating This Idea:
A.) “Preliminary Evaluation for an Optimized Oil-Free Rotorcraft Engine Idea,” by Samuel A. Howard, Robert J. Bruckner, Christopher, Kevin C. Radil. (NASA/TM-2008-215064 March 2008; ARL-TR-4398).
B.) “Tribology: Rules and Design Purposes,” by R. D. Arnell, P. B. Davies, J. Halling, T. L. Whomes.
C.) “Measurements of Drag Torque, Carry-Off Journal Pace and Temperature in a Metallic Mesh Foil Bearing,” by Luis San Andres, T. A. Chirathadam, Keun Ryu, and Tae Ho Kim (J. Eng. Gasoline Generators Energy 132(11), 112503 (Aug 11, 2010) (7 pages)doi:10.1115/1.4000863).
D.) “Thermohydrodynamic Mannequin Predictions and Efficiency Measurements of Bump-Kind Foil Bearing for Oil-Free Turboshaft Engines in Rotorcraft Propulsion Techniques,” by Tae Ho Kim and Luis San Andres. (J. Tribol 132(1), 011701 (Nov 11, 2009) (11 pages)doi:10.1115/1.4000279).
E.) “Foil Bearing Beginning Concerns and Necessities for Rotorcraft Engine Purposes,” by Okay. C. Radil (Military Analysis Lab) and C. Della Corte (NASA). August 2009, Doc # 201200112857, (ARL-TR-4873, E-18263).