Method and system for calculating rewinding moment of reel of airplane soft refueling system

Abstract

The invention belongs to the technical field of structural dynamics, and particularly relates to an aircraft soft refueling system reel rewinding moment calculation method and system.The method comprises the steps that a taper sleeve aerodynamic force formula is determined according to basic parameters needed by calculation, and then pneumatic differential pressure force borne by a refueling hose is determined according to the taper sleeve aerodynamic force formula, the taper sleeve gravity and the direction; determining an attack angle formula of the refueling hose according to the gravity direction and the pneumatic differential pressure force direction of the refueling hose; acquiring the direction of the pneumatic friction force when the reel rewinds the refueling hose after the oil receiver and the refueling machine are butted, and calculating the pneumatic friction force; the angle of the refueling hose in the balanced state is obtained, and then the rewinding moment of the reel is calculated according to the angle of attack of the refueling hose and the pneumatic friction force of the refueling hose. According to the method, the winding moment of the reel of the aircraft soft refueling system can be quickly calculated according to known data, the calculation cost and period of the winding moment are greatly reduced, and a simple and universal calculation method is provided for the design of the aircraft soft refueling system.

Description

Technical Field

[0001] The present application belongs to the field of structural dynamics technology, and in particular relates to a method and system for calculating the reel reel torque of an aircraft soft refueling system. Background Art

[0002] Aerial refueling is mainly divided into hard refueling and soft refueling. my country currently uses soft refueling, that is, a refueling hose-drogue refueling system. The system consists of a power unit, a refueling hose winch mechanism, a control system, a brake system, a refueling hose and a drogue. The drogue consists of a stabilizing parachute and a refueling plug. The refueling hose drogue is affected by the wake of the refueling aircraft, the nose wave of the refueling aircraft, and atmospheric turbulence. The refueling hose whipping phenomenon often occurs during docking. At present, the refueling pods are equipped with a constant force spring device to maintain the tension of the refueling hose and suppress the refueling hose whipping phenomenon, but the accident rate in the aerial refueling docking stage is still as high as 2.5%, which is much higher than the landing stage with the highest risk level. The main reason for the whipping phenomenon is that the refueling hose rewinding torque is insufficient, resulting in a slow rewinding of the refueling hose and relaxation. Under the action of aerodynamic force, it gradually rises and whipping occurs at the end of the refueling hose, which causes the refueling plug to break at the least, and more serious flight safety accidents at the worst. If the winding torque is designed to be too large, the oil plug will be pulled out. If the winding torque is designed to be too small, it will cause whipping. Generally, the winding process is simulated by fluid-solid coupling dynamics method, and the winding torque is determined by repeated iterative optimization. However, there is often a lack of simple and universal calculation methods to determine the specific value. Summary of the invention

[0003] The purpose of this application is to provide a method and system for calculating the reel reel reel torque of an aircraft soft refueling system, so as to solve the problem of complex reel torque design in the prior art.

[0004] The technical solution of the present application is: a method for calculating the reel reel rewinding torque of an aircraft soft refueling system, comprising:

[0005] Determine the basic parameters required for calculation;

[0006] Determine the aerodynamic formula of the drogue sleeve based on the basic parameters required for calculation, and then determine the aerodynamic differential pressure force on the refueling hose based on the aerodynamic formula of the drogue sleeve, the gravity and direction of the drogue sleeve; determine the angle of attack formula of the refueling hose based on the gravity direction and the aerodynamic differential pressure force direction of the refueling hose;

[0007] Obtain the direction of the aerodynamic friction force when the reel reels back the refueling hose after the refueling machine and the refueling machine are docked, which is used to calculate the aerodynamic friction force;

[0008] The angle of the refueling hose in the equilibrium state is obtained, and then the reel reel torque is calculated according to the refueling hose angle of attack and the aerodynamic friction of the refueling hose.

[0009] Preferably, the basic parameters include the reel radius r, the reel rotation inertia I, the reel rotation resistance torque f M , refueling hose length l, refueling hose diameter D, refueling hose line density ρ l , Driving sleeve aerodynamic drag coefficient C D , cone sleeve equivalent aerodynamic area S D , cone sleeve weight G D , the true air speed v of the far-field incoming flow, the aerodynamic viscosity coefficient u corresponding to the flight altitude, and the air density ρ.

[0010] Preferably, the aerodynamic formula of the cone sleeve is q·C D ·S D The aerodynamic direction of the cone sleeve is consistent with the incoming flow direction, where q is the free incoming flow pressure, and the air flow velocity calculation formula in the cone sleeve is 1 / 2·ρ·v 2 , the gravity of the cone sleeve is G D , the direction is vertically downward, the pneumatic pressure difference force on the refueling hose is 0.6·q·π·D·l, the pneumatic pressure difference force is perpendicular to the axis of the refueling hose and upward, and the gravity of the refueling hose is 9.8·ρ l ·l.

[0011] Preferably, the angle of attack formula of the refueling hose is:

[0012]

[0013] Preferably, the direction of the pneumatic friction force when the reel rewinds the refueling hose is downward along the axial direction of the refueling hose, and the pneumatic friction force calculation formula is:

[0014]

[0015] Preferably, the refueling hose angle is selected to be twice the angle of attack of the refueling hose in the equilibrium state; according to Newton's second law, the calculation formula for the reel winding torque is:

[0016] M F =F t ·r+3·ρ l ·l·r+3·I / r+f M +9.8·ρl·l·sin2α.

[0017] As a specific implementation, a reel rewind torque calculation system for an aircraft soft refueling system includes a basic parameter determination module, a refueling hose angle of attack calculation module, an aerodynamic friction calculation module, and a reel rewind torque calculation module;

[0018] The basic parameter determination module is used to determine the basic parameters required for calculation;

[0019] The refueling hose angle of attack calculation module is used to determine the drogue aerodynamic formula based on the basic parameters required for calculation, and then determine the aerodynamic pressure difference force on the refueling hose based on the drogue aerodynamic formula, the drogue gravity and direction; determine the refueling hose angle of attack formula based on the gravity direction and aerodynamic pressure difference force direction of the refueling hose;

[0020] The pneumatic friction calculation module is used to obtain the direction of the pneumatic friction when the reel reels around the refueling hose after the refueling machine and the refueling machine are docked, so as to calculate the pneumatic friction;

[0021] The reel rewinding torque calculation module is used to obtain the angle of the refueling hose in the equilibrium state, and then calculate the reel rewinding torque according to the refueling hose angle of attack and the aerodynamic friction of the refueling hose.

[0022] The technical solution of the present application is: a method for calculating the reel reel rewinding torque of an aircraft soft refueling system, comprising:

[0023] Determine the basic parameters required for calculation;

[0024] Determine the aerodynamic formula of the drogue sleeve based on the basic parameters required for calculation, and then determine the aerodynamic differential pressure force on the refueling hose based on the aerodynamic formula of the drogue sleeve, the gravity and direction of the drogue sleeve; determine the angle of attack formula of the refueling hose based on the gravity direction and the aerodynamic differential pressure force direction of the refueling hose;

[0025] Obtain the direction of the aerodynamic friction force when the reel reels back the refueling hose after the refueling machine and the refueling machine are docked, which is used to calculate the aerodynamic friction force;

[0026] The angle of the refueling hose in the equilibrium state is obtained, and then the reel reel torque is calculated according to the refueling hose angle of attack and the aerodynamic friction of the refueling hose.

[0027] Preferably, the basic parameters include the reel radius r, the reel rotation inertia I, the reel rotation resistance torque f M , refueling hose length l, refueling hose diameter D, refueling hose line density ρ l , Driving sleeve aerodynamic drag coefficient C D , cone sleeve equivalent aerodynamic area S D , cone sleeve weight G D , the true air speed v of the far-field incoming flow, the aerodynamic viscosity coefficient u corresponding to the flight altitude, and the air density ρ.

[0028] Preferably, the aerodynamic formula of the cone sleeve is q·C D ·S D The aerodynamic direction of the cone sleeve is consistent with the incoming flow direction, where q is the free incoming flow pressure, and the air flow velocity calculation formula in the cone sleeve is 1 / 2·ρ·v 2 , the gravity of the cone sleeve is G D, the direction is vertically downward, the pneumatic pressure difference force on the refueling hose is 0.6·q·π·D·l, the pneumatic pressure difference force is perpendicular to the axis of the refueling hose and upward, and the gravity of the refueling hose is 9.8·ρ l ·l.

[0029] Preferably, the angle of attack formula of the refueling hose is:

[0030]

[0031] Preferably, the direction of the pneumatic friction force when the reel rewinds the refueling hose is downward along the axial direction of the refueling hose, and the pneumatic friction force calculation formula is:

[0032]

[0033] Preferably, the refueling hose angle is selected to be twice the angle of attack of the refueling hose in the equilibrium state; according to Newton's second law, the calculation formula for the reel winding torque is:

[0034] M F =F t ·r+3·ρ l ·l·r+3·I / r+f M +9.8·ρ l ·l·sin2α.

[0035] The aircraft soft refueling system reel rewind torque calculation method and system of the present application can quickly calculate the aircraft soft refueling system reel rewind torque based on known data, greatly reducing the calculation cost and cycle of the rewind torque, and providing a simple and universal calculation method for the design of the aircraft soft refueling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.

[0037] Figure 1 This is a schematic diagram of the overall process of this application. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] A method for calculating the reel reel torque of an aircraft soft refueling system, such as Figure 1 The method comprises the following steps:

[0040] Step S100, determining basic parameters required for calculation.

[0041] The basic parameters include the reel radius r, the reel moment of inertia I, and the reel rotation resistance moment f. M , refueling hose length l, refueling hose diameter D, refueling hose line density ρ l , Driving sleeve aerodynamic drag coefficient C D , cone sleeve equivalent aerodynamic area S D , cone sleeve weight G D , the true air speed v of the far-field incoming flow, the aerodynamic viscosity coefficient u corresponding to the flight altitude, and the air density ρ.

[0042] Step S200, calculating the angle of attack of the refueling hose in a balanced state.

[0043] The aerodynamic formula of the cone sleeve is determined based on the basic parameters required for calculation, and then the aerodynamic pressure difference force on the refueling hose is determined based on the aerodynamic formula of the cone sleeve, the gravity and direction of the cone sleeve; the angle of attack formula of the refueling hose is determined based on the gravity direction and the direction of the aerodynamic pressure difference force of the refueling hose.

[0044] The aerodynamic formula of the cone sleeve is q·C D ·S D The aerodynamic direction of the cone sleeve is consistent with the incoming flow direction, where q is the free incoming flow pressure, and the air flow velocity calculation formula in the cone sleeve is 1 / 2·ρ·v 2 , the gravity of the cone sleeve is G D , the direction is vertically downward, the pneumatic pressure difference force on the refueling hose is 0.6·q·π·D·l, the pneumatic pressure difference force is perpendicular to the axis of the refueling hose and upward, and the gravity of the refueling hose is 9.8·ρ l l, the direction is vertically downward, the end of the refueling hose is hinged, and the formula for the angle of attack of the refueling hose can be obtained according to the moment balance formula as follows:

[0045]

[0046] Step S300, calculating the pneumatic friction force of the refueling hose.

[0047] Obtain the direction of the aerodynamic friction force when the reel rewinds the refueling hose after the refueling machine and the refueling machine are docked, which is used to calculate the aerodynamic friction force.

[0048] Specifically: After the receiving machine and the refueling machine are docked, the aerodynamic force and gravity of the cone sleeve are borne by the receiving machine's refueling plug. When the reel reels back the refueling hose, it is necessary to overcome the aerodynamic friction on the refueling hose. The direction of the aerodynamic friction is downward along the axis of the refueling hose. The calculation formula for the aerodynamic friction is as follows:

[0049]

[0050] Step S400, calculating the reel rewinding torque.

[0051] The angle of the refueling hose in the equilibrium state is obtained, and then the reel reel torque is calculated according to the refueling hose angle of attack and the aerodynamic friction of the refueling hose.

[0052] The rewinding acceleration of the refueling hose is at least 3m / s 2 The reel needs to drive its own rotation and the refueling hose to move at the same time, and needs to overcome the reel rotation resistance torque, the aerodynamic friction of the refueling hose, and the refueling hose gravity component along the refueling hose axis. Considering that the refueling hose may be loose, when calculating the refueling hose gravity component, the refueling hose angle is selected to be twice the refueling hose angle of attack in the equilibrium state. According to Newton's second law, the formula for calculating the reel's winding torque is as follows:

[0053] M F =F t ·r+3·ρ l ·l·r+3·I / r+f M +9.8·ρ l ·l·sin2α.

[0054] Through the above design, the reel reel rewinding torque of the aircraft soft refueling system can be quickly calculated based on known data, which greatly reduces the calculation cost and cycle of the rewinding torque and provides a simple and universal calculation method for the design of the aircraft soft refueling system.

[0055] As a specific implementation, it also includes a reel rewind torque calculation system for an aircraft soft refueling system, which specifically includes a basic parameter determination module, a refueling hose angle of attack calculation module, an aerodynamic friction force calculation module and a reel rewind torque calculation module.

[0056] The basic parameter determination module is used to determine the basic parameters required for calculation;

[0057] The refueling hose angle of attack calculation module is used to determine the drogue aerodynamic formula based on the basic parameters required for calculation, and then determine the aerodynamic pressure difference force on the refueling hose based on the drogue aerodynamic formula, the drogue gravity and direction; determine the refueling hose angle of attack formula based on the gravity direction and aerodynamic pressure difference force direction of the refueling hose;

[0058] The pneumatic friction calculation module is used to obtain the direction of the pneumatic friction when the reel reels around the refueling hose after the refueling machine and the refueling machine are docked, so as to calculate the pneumatic friction;

[0059] The reel rewinding torque calculation module is used to obtain the angle of the refueling hose in the equilibrium state, and then calculate the reel rewinding torque according to the refueling hose angle of attack and the aerodynamic friction of the refueling hose.

[0060] Preferably, the basic parameters include the reel radius r, the reel rotation inertia I, the reel rotation resistance torque f M , refueling hose length l, refueling hose diameter D, refueling hose line density ρ l , Driving sleeve aerodynamic drag coefficient C D , cone sleeve equivalent aerodynamic area S D , cone sleeve weight G D , the true air speed v of the far-field incoming flow, the aerodynamic viscosity coefficient u corresponding to the flight altitude, and the air density ρ.

[0061] Preferably, the aerodynamic formula of the cone sleeve is q·C D ·S D The aerodynamic direction of the cone sleeve is consistent with the incoming flow direction, where q is the free incoming flow pressure, and the air flow velocity calculation formula in the cone sleeve is 1 / 2·ρ·v 2 , the gravity of the cone sleeve is G D , the direction is vertically downward, the pneumatic pressure difference force on the refueling hose is 0.6·q·π·D·l, the pneumatic pressure difference force is perpendicular to the axis of the refueling hose and upward, and the gravity of the refueling hose is 9.8·ρ l ·l.

[0062] Preferably, the angle of attack formula of the refueling hose is:

[0063]

[0064] Preferably, the direction of the pneumatic friction force when the reel rewinds the refueling hose is downward along the axial direction of the refueling hose, and the pneumatic friction force calculation formula is:

[0065]

[0066] Preferably, the angle of the refueling hose is selected to be twice the angle of attack of the refueling hose in the equilibrium state; according to Newton's second law, the calculation formula for the reel winding torque is obtained as follows:

[0067] M F =F t ·r+3·ρ l ·l·r+3·I / r+f M +9.8·ρ l ·l·sin2α.

[0068] As a specific implementation method, a specific example is used to illustrate:

[0069] Step S100, determine the basic parameters required for calculation, including hose length l = 22.86m, hose diameter D = 0.067m, hose line density ρ l =4.11kg / m, cone sleeve aerodynamic drag coefficient C D =0.831, cone sleeve equivalent aerodynamic area SD =0.283m 2 , cone sleeve weight G D =295N, assuming the reel radius r = 0.5m, reel moment of inertia I = 15N·m 2 , reel rotation resistance torque f M =200N·m, the true air velocity of the far-field incoming flow v=200m / s. According to the data, the aerodynamic viscosity coefficient u corresponding to the flight altitude of 8000m is 1.527×10 -5 kg / (m·s), air density ρ=0.526kg / m 3 .

[0070] Step S200, calculating the angle of attack of the refueling hose in a balanced state:

[0071]

[0072]

[0073] Step S300, calculating the resistance that needs to be overcome when the reel is rewound

[0074]

[0075] Step S400, calculating the reel rewinding force

[0076] M F =F t ·r+3·ρ l ·l·r+3·I / r+f M +9.8·ρ l ·l·sin2α

[0077] =1705×0.5+3×4.11×22.86×0.5+3×15÷0.5+200+9.8×4.11×22.86×sin(2×0.073)=1492N-m

[0078] Finally, it should be noted that: the drawings of the embodiments disclosed in the present invention only involve structures related to the embodiments disclosed in the present invention, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0079] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for calculating the reel reel torque of an aircraft soft refueling system, characterized in that: include: Determine the basic parameters required for calculation; Determine the aerodynamic formula of the drogue sleeve based on the basic parameters required for calculation, and then determine the aerodynamic differential pressure force on the refueling hose based on the aerodynamic formula of the drogue sleeve, the gravity and direction of the drogue sleeve; determine the angle of attack formula of the refueling hose based on the gravity direction and the aerodynamic differential pressure force direction of the refueling hose; Obtain the direction of the aerodynamic friction force when the reel reels back the refueling hose after the refueling machine and the refueling machine are docked, which is used to calculate the aerodynamic friction force; The angle of the refueling hose in the equilibrium state is obtained, and then the reel reel torque is calculated according to the refueling hose angle of attack and the aerodynamic friction of the refueling hose.

2. The method for calculating the reel rewinding torque of an aircraft soft refueling system according to claim 1, characterized in that: The basic parameters include the reel radius r, the reel rotation inertia I, the reel rotation resistance torque f M , refueling hose length l, refueling hose diameter D, refueling hose line density ρ l , Driving sleeve aerodynamic drag coefficient C D , cone sleeve equivalent aerodynamic area S D , cone sleeve weight G D , the true air speed v of the far-field incoming flow, the aerodynamic viscosity coefficient u corresponding to the flight altitude, and the air density ρ.

3. The method for calculating the reel rewinding torque of an aircraft soft refueling system according to claim 2, characterized in that: The aerodynamic formula of the cone sleeve is q·C D ·S D The aerodynamic direction of the cone sleeve is consistent with the incoming flow direction, where q is the free incoming flow pressure, and the air flow velocity calculation formula in the cone sleeve is 1 / 2·ρ·v 2 , the gravity of the cone sleeve is G D , the direction is vertically downward, the pneumatic pressure difference force on the refueling hose is 0.6·q·π·D·l, the pneumatic pressure difference force is perpendicular to the axis of the refueling hose and upward, and the gravity of the refueling hose is 9.9·ρ l ·l.

4. The method for calculating the reel rewinding torque of an aircraft soft refueling system according to claim 3, characterized in that: The angle of attack formula of the refueling hose is:

5. The method for calculating the reel rewinding torque of an aircraft soft refueling system according to claim 2, characterized in that: The direction of the pneumatic friction force when the reel rewinds the refueling hose is downward along the axial direction of the refueling hose. The pneumatic friction force calculation formula is:

6. The method for calculating the reel rewinding torque of an aircraft soft refueling system according to claim 2, characterized in that: The angle of the refueling hose is selected to be twice the angle of attack of the refueling hose in the equilibrium state; according to Newton's second law, the calculation formula for the reel winding torque is: M F =F t ·r+3·r l ·l·r+3·I / r+f M +9.8·r l ·l·sin2α.

7. A system for calculating the reel reel torque of an aircraft soft refueling system, using the method according to any one of claims 1 to 6, characterized in that: It includes a basic parameter determination module, a refueling hose angle of attack calculation module, an aerodynamic friction calculation module and a reel rewinding torque calculation module; The basic parameter determination module is used to determine the basic parameters required for calculation; The refueling hose angle of attack calculation module is used to determine the drogue aerodynamic formula based on the basic parameters required for calculation, and then determine the aerodynamic pressure difference force on the refueling hose based on the drogue aerodynamic formula, the drogue gravity and direction; determine the refueling hose angle of attack formula based on the gravity direction and aerodynamic pressure difference force direction of the refueling hose; The pneumatic friction calculation module is used to obtain the direction of the pneumatic friction when the reel reels around the refueling hose after the refueling machine and the refueling machine are docked, so as to calculate the pneumatic friction; The reel rewinding torque calculation module is used to obtain the angle of the refueling hose in the equilibrium state, and then calculate the reel rewinding torque according to the refueling hose angle of attack and the aerodynamic friction of the refueling hose.

8. The aircraft soft refueling system reel rewinding torque calculation system as claimed in claim 7, characterized in that: The basic parameters include the reel radius r, the reel rotation inertia I, the reel rotation resistance torque f M , refueling hose length l, refueling hose diameter D, refueling hose line density ρ l , Driving sleeve aerodynamic drag coefficient C D , cone sleeve equivalent aerodynamic area S D , cone sleeve weight G D , the true air speed v of the far-field incoming flow, the aerodynamic viscosity coefficient u corresponding to the flight altitude, and the air density ρ.

9. The aircraft soft refueling system reel rewinding torque calculation system according to claim 7, characterized in that: The aerodynamic formula of the cone sleeve is q·C D ·S D The aerodynamic direction of the cone sleeve is consistent with the incoming flow direction, where q is the free incoming flow pressure, and the air flow velocity calculation formula in the cone sleeve is 1 / 2·ρ·v 2 , the gravity of the cone sleeve is G D , the direction is vertically downward, the pneumatic pressure difference force on the refueling hose is 0.6·q·π·D·l, the pneumatic pressure difference force is perpendicular to the axis of the refueling hose and upward, and the gravity of the refueling hose is 9.8·ρ l ·l.

10. The aircraft soft refueling system reel rewinding torque calculation system as claimed in claim 9, characterized in that: The angle of attack formula of the refueling hose is:

11. The aircraft soft refueling system reel rewinding torque calculation system according to claim 9, characterized in that: The direction of the pneumatic friction force when the reel rewinds the refueling hose is downward along the axial direction of the refueling hose. The pneumatic friction force calculation formula is:

12. The aircraft soft refueling system reel rewinding torque calculation system as claimed in claim 9, characterized in that: The angle of the refueling hose is selected to be twice the angle of attack of the refueling hose in the equilibrium state; according to Newton's second law, the calculation formula for the reel winding torque is: M F =F t ·r+3·r l ·l·r+3·I / r+f M +9.8·r l ·l·sin2α.

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