WO2020250251A1

WO2020250251A1 - Method to reduce wear and pollution of the aircraft with a new concept of the venturi's tube

Info

Publication number: WO2020250251A1
Application number: PCT/IT2019/000047
Authority: WO
Inventors: Daniele Aramini
Original assignee: Daniele Aramini
Priority date: 2019-06-10
Filing date: 2019-06-10
Publication date: 2020-12-17

Abstract

System and method for reducing the wear of a landing gear tire of an aircraft, the system comprising a circular crown of fins and a venturi tube arranged to accelerate the wheel to a speed synchronous with that of the aircraft during the landing phase.

Description

Title of Invention:

METHOD TO REDUCE WEAR AND POLLUTION OF THE AIRCRAFT WITH A NEW CONCEPT OF THE VENTURI'S TUBE

[0001] The present patent proposal has as its field of reference technique the methodology for reducing pollution phenomena during the landing phase of an aircraft.

[0002] The state of the existing technique, as far as we know, does not show anything similar from what is proposed here, in the sense that no particular structure exists today that reduces both the polluting phenomena of aircraft landing gear and the reduction of the deviation of the friction coefficient of a track caused by the release, by the aircraft, of tire traces.

[0003] Our invention covers the field of electronic, mechanical and aeronautical engineering in the sense that an electronic method will be developed applied to a mechanical device for an aeronautical vehicle.

[0004] Our method has a potential impact on the social utility as it provides an important tool to reduce the polluting phenomena due to aircraft landings.

[0005] Our invention definitively solves the problems of aircraft trajectories, as these are dynamically guided closely connected to the forces that exchange with the external environment; thanks to the gyroscopic effect that the wheels carry out still at altitude, there is an increase in the stability of the aircraft in the phase of alignment with the landing strip.

[0006] The aircraft undergoes the aberrant motion attributable to different circumstances, typically it manifests itself in the form of drifting or drifting motion. These are motions in which the aircraft undergoes a substantial deviation (drift) with respect to the expected direction (trajectory) or even a loss of grip (drift) when touching the track, these predicted problems and some unpredictable, arise for the most disparate, caused in every weather, in any weather condition: rain, snow, ice, track soiled by the rubber present released by aircraft during landing.

[0007] Our patent is constituted by a crown of fins integral with the tire-wheel rim, which through the Venturi's tube specially allocated at the bottom of the rim allows the wheel to be started when the aircraft approaching the landing strip opens the trolley.

[0008] The fins coming in contact with the air channeled inside the venturi's pipe, as shown in Fig.1 , through the air intake, undergo acceleration by transmitting a rotating direction to the wheel, in the direction of landing and thus allowing it to turn spontaneously reaching the gyroscopic speed of landing so that in the moment of contact with the track, there being no friction, the wheel does not cause the polluting cloud of molten rubber, stabilizing through this phenomenon the plane in a horizontal and perfect way with the and thus giving a soft and pleasant landing to passengers and crew members. [0009] The work done by the trolley organs is expressed by a type function:

[0010] [Math. 1]

Where R is the reaction of the soil, d the race D the maximum race. This law has general validity and the force will have a trend that depends on the element used in the trolley to absorb energy; with a perfectly elastic element not preloaded one would have R= kd; if preloaded we will have R = R₀ + kd ; with a perfectly rigid-elastic element we will have R=cost.

[0011] Having to consider an oleo-pneumatic element the trend of the reaction R as a function of d is represented by the work L having an expression of the type:

[Math. 2]

Where R_MAX is the maximum reaction reached and therefore, depending on the type of shock used, it will be that the performance of the shock will be:

[Math. 3]

[0012] The normal force Nm generated at the contact between the tire and the ground is given by the product of tiie pressure for the contact area A:

[Math. 4]

The braking force is given by the torque generated by the brakes on the wheel but is still applied according to the grip with the ground. Considering as a coefficient of friction the ratio between the tangential force and the normal force of a dragged and braked wheel, it is shown that this coefficient depends on a series of factors: tire material and condition, track material and conditions, longitudinal sliding and speed. The sliding coefficient K is then defined, which measures how much it smears or rotates the tire, and which is given by the ratio between the sliding speed v_sl and that of the aircraft v.

[Math. 5]

The v_sl to the numerator, being the speed with respect to the ground of a point of contact of the wheel with the track is given by the speed of the wheel (ie of the whole aircraft) with respect to the ground subtracted the tangential velocity of the point on the tire with respect to the hub of the wheel; the latter is given by the angular velocity w multiplied by the radius from the hub to the tread R_r (rolling radius).

[0013] Considering the functions L and h we will suitably dimension the fins integral with the tire- wheel rim so that the total number is a distribution equal to with m which represents the

appropriate spacing allowing exploiting the phenomenon of the Venturi’s tube which the wheel has a non-zero initial speed; this causes the melting phenomena of the tire to be reduced.

The lugs integral with the tire-bearing rim and in such a number as to have a distribution equal to have an appropriate height h such that the Venturi’s flow does not cause turbulence phenomena such as to reduce the resolutive effect deriving from our patent or to compromise the stability of the aircraft. The spacing m is between 20 and 30 so as to avoid turbulence inside the tire carriage, with a consequent reduction in the effect of the Venturi’s tube.

Claims

Title of Invention : New method to reduce wear and pollution of the aircraft with new concept of Venturi’s tube Claims

[Claim 1 ] Method for reducing the wear and tear of the landing gear tire of an

aircraft made up of a circular crown, part of the landing gear tire door system, on which the flaps and Venturi’s tube are alloyed to make the tire speed synchronous with that of the aircraft during the landing phase.

[Claim 2] System according to claim 1 wherein the circular crown on which the wings are allocated is a complementary and integral part of the trolleybearing circular crown and has the same structural composition.

[Claim 3] System according to claims 1 and 2 in which the fins are distributed on the circular crown according to step m which varies between 20° and 30°.

[Claim 4] System according to claims 1, 2 and 3 in which the fins having the shape and height of the same have the same structural composition of the circular pneumatic circular crown.

[Claim 5] System according to claim 1 , wherein the Venturi tube has a lenght equal to the diameter of the pneumatic circular crown.

[Claim 6] System according to claim 1 ,2,3,4 and 5 has a control system for driving the speed of the wheel to be synchronous with the landing speed of the aircraft^