A method and system for calculating the reel rewind torque of an aircraft soft refueling system

Abstract

This application belongs to the field of structural dynamics technology, and specifically relates to a method and system for calculating the reel winding torque of an aircraft flexible refueling system. The method includes: determining the aerodynamic formula of the conical sleeve based on the basic parameters required for calculation; then determining the aerodynamic pressure differential force on the refueling hose based on the conical sleeve aerodynamic formula, the weight of the conical sleeve, and its direction; determining the refueling hose angle of attack formula based on the direction of the refueling hose's weight and the direction of the aerodynamic pressure differential force; obtaining the direction of the aerodynamic friction force when the reel winds around the refueling hose after docking with the tanker aircraft, for calculating the aerodynamic friction force; obtaining the angle of the refueling hose under equilibrium conditions, and then calculating the reel winding torque based on the refueling hose angle of attack and the aerodynamic friction force of the refueling hose. This method can quickly calculate the reel winding torque of an aircraft flexible refueling system based on known data, significantly reducing the calculation cost and time, and providing a simple and universal calculation method for the design of aircraft flexible refueling systems.

Description

Technical Field

[0001] This application belongs to the field of structural dynamics technology, and specifically relates to a method and system for calculating the reel winding torque of an aircraft soft refueling system. Background Technology

[0002] Aerial refueling is mainly divided into rigid refueling and flexible refueling. my country currently uses flexible refueling, specifically the hose-and-drogue refueling system. This system consists of a power unit, a refueling hose winch mechanism, a control system, a braking system, a refueling hose, and a drogue. The drogue consists of a stabilizing parachute and a refueling probe. The refueling hose and drogue are affected by the tanker's wake, the receiver's nose wave, and atmospheric turbulence, often resulting in hose whipping during docking. Currently, refueling pods are equipped with constant-force spring devices to maintain hose tension and suppress whipping. However, the accident rate during the aerial refueling docking phase remains as high as 2.5%, far exceeding the highest-risk landing phase. The main cause of whipping is insufficient refueling hose winding torque, leading to slow winding and slack. Under aerodynamic forces, the hose gradually rises and whips at the end, causing the refueling probe to break or, in severe cases, more serious flight safety accidents. Excessive winding torque can cause the oil receiving plug to come off, while insufficient winding torque can lead to whiplash. Generally, the winding process is simulated using fluid-structure interaction dynamics, and the winding torque is determined through 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 winding torque of an aircraft soft refueling system, so as to solve the problem of the complex design of the winding torque in the prior art.

[0004] The technical solution of this application is: a method for calculating the reel winding torque of an aircraft soft refueling system, including:

[0005] Determine the basic parameters required for the calculation;

[0006] The aerodynamic formula for the conical sleeve is determined based on the basic parameters required for calculation. Then, the aerodynamic pressure differential force on the refueling hose is determined based on the aerodynamic formula, the weight and direction of the conical sleeve. The angle of attack formula for the refueling hose is determined based on the direction of the weight and the direction of the aerodynamic pressure differential force.

[0007] Obtain the direction of the aerodynamic friction force when the reel winds back around the refueling hose after the receiving unit and the refueling unit are docked, in order to calculate the aerodynamic friction force;

[0008] Obtain the angle of the refueling hose under equilibrium conditions, and then calculate the winding torque of the reel based on the angle of attack of the refueling hose and the aerodynamic friction of the refueling hose.

[0009] Preferably, the basic parameters include the reel radius r, the reel moment of inertia I, and the reel rotational resistance torque f. M 1. Refueling hose length l, refueling hose diameter D, refueling hose linear density ρ l The aerodynamic drag coefficient C of the cone sleeve D The equivalent aerodynamic area S of the cone sleeve D Weight of the tapered sleeve G D The far-field incoming vacuum velocity v, the aerodynamic viscosity coefficient u corresponding to the flight altitude, and the air density ρ.

[0010] Preferably, the aerodynamic formula for the conical sleeve is q·C D ·S D The aerodynamic direction of the cone sleeve is the same as the incoming flow direction, where q is the free incoming flow pressure. The formula for calculating the air velocity inside the cone sleeve is 1 / 2·ρ·v. 2 The weight of the cone sleeve is G. D The direction of the pneumatic pressure difference force on the refueling hose is vertically downward, and the direction of the pneumatic pressure difference force is perpendicular to the axis of the refueling hose and upward. The weight of the refueling hose is 9.8 ρ. l ·l.

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

[0012]

[0013] Preferably, the direction of the pneumatic friction force when the reel winds back the refueling hose is downward along the axial direction of the refueling hose, and the formula for calculating the pneumatic friction force is:

[0014]

[0015] Preferably, the angle of the refueling hose is selected as twice the angle of attack of the refueling hose under equilibrium conditions; according to Newton's second law, the formula for calculating the winding torque of the reel is as follows:

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

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

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

[0019] The refueling hose angle of attack calculation module is used to determine the cone sleeve 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 cone sleeve aerodynamic formula, the weight and direction of the cone sleeve; and determine the refueling hose angle of attack formula based on the direction of the weight of the refueling hose and the direction of the aerodynamic pressure difference force.

[0020] The pneumatic friction calculation module is used to obtain the direction of the pneumatic friction force when the reel winds back around the refueling hose after the receiving unit and the refueling unit are docked, and is used to calculate the pneumatic friction force.

[0021] The reel winding torque calculation module is used to obtain the angle of the refueling hose under equilibrium conditions, and then calculates the reel winding torque based on the angle of attack of the refueling hose and the aerodynamic friction of the refueling hose.

[0022] The technical solution of this application is: a method for calculating the reel winding torque of an aircraft soft refueling system, including:

[0023] Determine the basic parameters required for the calculation;

[0024] The aerodynamic formula for the conical sleeve is determined based on the basic parameters required for calculation. Then, the aerodynamic pressure differential force on the refueling hose is determined based on the aerodynamic formula, the weight and direction of the conical sleeve. The angle of attack formula for the refueling hose is determined based on the direction of the weight and the direction of the aerodynamic pressure differential force.

[0025] Obtain the direction of the aerodynamic friction force when the reel winds back around the refueling hose after the receiving unit and the refueling unit are docked, in order to calculate the aerodynamic friction force;

[0026] Obtain the angle of the refueling hose under equilibrium conditions, and then calculate the winding torque of the reel based on the angle of attack of the refueling hose and the aerodynamic friction of the refueling hose.

[0027] Preferably, the basic parameters include the reel radius r, the reel moment of inertia I, and the reel rotational resistance torque f. M 1. Refueling hose length l, refueling hose diameter D, refueling hose linear density ρ l The aerodynamic drag coefficient C of the cone sleeve D The equivalent aerodynamic area S of the cone sleeve D Weight of the tapered sleeve G D The far-field incoming vacuum velocity v, the aerodynamic viscosity coefficient u corresponding to the flight altitude, and the air density ρ.

[0028] Preferably, the aerodynamic formula for the conical sleeve is q·C D ·S D The aerodynamic direction of the cone sleeve is the same as the incoming flow direction, where q is the free incoming flow pressure. The formula for calculating the air velocity inside the cone sleeve is 1 / 2·ρ·v. 2 The weight of the cone sleeve is G. DThe direction of the pneumatic pressure difference force on the refueling hose is vertically downward, and the direction of the pneumatic pressure difference force is perpendicular to the axis of the refueling hose and upward. The weight of the refueling hose is 9.8 ρ. l ·l.

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

[0030]

[0031] Preferably, the direction of the pneumatic friction force when the reel winds back the refueling hose is downward along the axial direction of the refueling hose, and the formula for calculating the pneumatic friction force is:

[0032]

[0033] Preferably, the angle of the refueling hose is selected as twice the angle of attack of the refueling hose under equilibrium conditions; according to Newton's second law, the formula for calculating the winding torque of the reel is as follows:

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

[0035] The method and system for calculating the reel winding torque of an aircraft soft refueling system disclosed in this application can quickly calculate the reel winding torque of an aircraft soft refueling system based on known data, which greatly reduces the calculation cost and cycle of the winding torque and provides a simple and universal calculation method for the design of aircraft soft refueling systems. Attached Figure Description

[0036] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

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

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

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

[0040] Step S100: Determine the basic parameters required for the calculation.

[0041] The basic parameters include the reel radius r, the reel moment of inertia I, and the reel rotational resistance torque f. M 1. Refueling hose length l, refueling hose diameter D, refueling hose linear density ρ l The aerodynamic drag coefficient C of the cone sleeve D The equivalent aerodynamic area S of the cone sleeve D Weight of the tapered sleeve G D The far-field incoming vacuum velocity v, the aerodynamic viscosity coefficient u corresponding to the flight altitude, and the air density ρ.

[0042] Step S200: Calculate the angle of attack of the refueling hose under balanced conditions.

[0043] The aerodynamic formula for the conical sleeve is determined based on the basic parameters required for calculation. Then, the aerodynamic pressure differential force on the refueling hose is determined based on the aerodynamic formula for the conical sleeve, the weight of the conical sleeve, and its direction. The angle of attack formula for the refueling hose is determined based on the direction of the weight of the refueling hose and the direction of the aerodynamic pressure differential force.

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

[0045]

[0046] Step S300: Calculate the pneumatic friction force of the refueling hose.

[0047] The direction of the aerodynamic friction force is obtained when the reel rewinds the refueling hose after the receiving machine and the refueling machine are docked, in order to calculate the aerodynamic friction force.

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

[0049]

[0050] Step S400: Calculate the reel winding torque.

[0051] Obtain the angle of the refueling hose under equilibrium conditions, and then calculate the winding torque of the reel based on the angle of attack of the refueling hose and the aerodynamic friction of the refueling hose.

[0052] The refueling hose's rewind acceleration must be at least 3 m / s². 2 The reel needs to simultaneously rotate itself and move the refueling hose, overcoming the rotational resistance torque of the reel, the aerodynamic friction of the refueling hose, and the component of the refueling hose's weight along its axis. Considering the possibility of slack in the refueling hose, the angle of the refueling hose is chosen to be twice the angle of attack of the refueling hose in equilibrium when calculating the component of the refueling hose's weight. 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] The above design allows for the rapid calculation of the reel winding torque of an aircraft soft refueling system based on known data, significantly reducing the calculation cost and time required for the winding torque and providing a simple and universal calculation method for the design of aircraft soft refueling systems.

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

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

[0057] The refueling hose angle of attack calculation module is used to determine the cone sleeve 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 cone sleeve aerodynamic formula, the weight and direction of the cone sleeve; and determine the refueling hose angle of attack formula based on the direction of the weight of the refueling hose and the direction of the aerodynamic pressure difference force.

[0058] The pneumatic friction calculation module is used to obtain the direction of the pneumatic friction force when the reel winds back around the refueling hose after the receiving unit and the refueling unit are docked, and is used to calculate the pneumatic friction force.

[0059] The reel winding torque calculation module is used to obtain the angle of the refueling hose under equilibrium conditions, and then calculates the reel winding torque based on the angle of attack of the refueling hose and the aerodynamic friction of the refueling hose.

[0060] Preferably, the basic parameters include the reel radius r, the reel moment of inertia I, and the reel rotational resistance torque f. M 1. Refueling hose length l, refueling hose diameter D, refueling hose linear density ρ l The aerodynamic drag coefficient C of the cone sleeve D The equivalent aerodynamic area S of the cone sleeve D Weight of the tapered sleeve G D The far-field incoming vacuum velocity v, the aerodynamic viscosity coefficient u corresponding to the flight altitude, and the air density ρ.

[0061] Preferably, the aerodynamic formula for the conical sleeve is q·C D ·S D The aerodynamic direction of the cone sleeve is the same as the incoming flow direction, where q is the free incoming flow pressure. The formula for calculating the air velocity inside the cone sleeve is 1 / 2·ρ·v. 2 The weight of the cone sleeve is G. D The direction of the pneumatic pressure difference force on the refueling hose is vertically downward, and the direction of the pneumatic pressure difference force is perpendicular to the axis of the refueling hose and upward. The weight of the refueling hose is 9.8 ρ. l ·l.

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

[0063]

[0064] Preferably, the direction of the aerodynamic friction force when the reel winds back the refueling hose is downward along the axial direction of the refueling hose, and the formula for calculating the aerodynamic friction force is:

[0065]

[0066] Preferably, the angle of the refueling hose is selected as twice the angle of attack of the refueling hose under equilibrium conditions; according to Newton's second law, the formula for calculating the winding torque of the reel is 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 one specific implementation method, the following is an illustration using a concrete example:

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

[0070] Step S200, calculate the angle of attack of the refueling hose under balanced conditions:

[0071]

[0072]

[0073] Step S300: Calculate the resistance that needs to be overcome when rewinding the reel.

[0074]

[0075] Step S400: Calculate the reel winding 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 accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0079] In conclusion, 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 within the protection scope of the present invention.

Claims

1. A method for calculating the reel winding torque of an aircraft soft refueling system, characterized in that, include: Determine the basic parameters required for the calculation; The aerodynamic formula for the conical sleeve is determined based on the basic parameters required for calculation. Then, the aerodynamic pressure differential force on the refueling hose is determined based on the aerodynamic formula, the weight and direction of the conical sleeve. The angle of attack formula for the refueling hose is determined based on the direction of the weight and the direction of the aerodynamic pressure differential force. The direction of the aerodynamic friction force is obtained when the reel winds back the refueling hose after the receiving unit and the refueling unit are docked, in order to calculate the aerodynamic friction force; Obtain the angle of the refueling hose under equilibrium conditions, and then calculate the winding torque of the reel based on the angle of attack of the refueling hose and the aerodynamic friction of the refueling hose.

2. The method for calculating the reel winding torque of an aircraft soft refueling system as described in claim 1, characterized in that: The basic parameters include the reel radius r, the reel moment of inertia I, and the reel rotational resistance torque f. M 1. Refueling hose length l, refueling hose diameter D, refueling hose linear density ρ l The aerodynamic drag coefficient C of the cone sleeve D The equivalent aerodynamic area S of the cone sleeve D Weight of the tapered sleeve G D The far-field incoming vacuum velocity v, the aerodynamic viscosity coefficient u corresponding to the flight altitude, and the air density ρ.

3. The method for calculating the reel winding torque of an aircraft soft refueling system as described in claim 2, characterized in that: The aerodynamic formula for the cone sleeve is q·C D ·S D The aerodynamic direction of the cone sleeve is consistent with the direction of the incoming flow, where q is the free-flowing pressure. The formula for calculating the air velocity inside the cone sleeve is 1 / 2·ρ·v. 2 The weight of the cone sleeve is G. D The direction of the pneumatic pressure difference force on the refueling hose is vertically downwards, and the direction of the pneumatic pressure difference force is perpendicular to the axis of the refueling hose and upwards. The weight of the refueling hose is 9.9 ρ. l ·l.

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

5. The method for calculating the reel winding torque of an aircraft soft refueling system as described in claim 2, characterized in that: The direction of the pneumatic friction force when the reel winds back the refueling hose is downward along the axial direction of the refueling hose. The formula for calculating the pneumatic friction force is:

6. The method for calculating the reel winding torque of an aircraft soft refueling system as described in claim 2, characterized in that, The angle of the refueling hose is selected as twice the angle of attack of the refueling hose under equilibrium conditions; according to Newton's second law, the formula for calculating the winding torque of the reel is as follows: 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 winding torque of an aircraft soft refueling system, employing the method described in any one of claims 1-6, 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 winding torque calculation module; The basic parameter determination module is used to determine the basic parameters required for the calculation; The refueling hose angle of attack calculation module is used to determine the cone sleeve 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 cone sleeve aerodynamic formula, the weight and direction of the cone sleeve; and determine the refueling hose angle of attack formula based on the direction of the weight of the refueling hose and the direction of the aerodynamic pressure difference force. The pneumatic friction calculation module is used to obtain the direction of the pneumatic friction force when the reel winds back around the refueling hose after the receiving unit and the refueling unit are docked, and is used to calculate the pneumatic friction force. The reel winding torque calculation module is used to obtain the angle of the refueling hose under equilibrium conditions, and then calculates the reel winding torque based on the angle of attack of the refueling hose and the aerodynamic friction of the refueling hose.

8. The aircraft soft refueling system reel winding torque calculation system as described in claim 7, characterized in that: The basic parameters include the reel radius r, the reel moment of inertia I, and the reel rotational resistance torque f. M 1. Refueling hose length l, refueling hose diameter D, refueling hose linear density ρ l The aerodynamic drag coefficient C of the cone sleeve D The equivalent aerodynamic area S of the cone sleeve D Weight of the tapered sleeve G D The far-field incoming vacuum velocity v, the aerodynamic viscosity coefficient u corresponding to the flight altitude, and the air density ρ.

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

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

11. The aircraft soft refueling system reel winding torque calculation system as described in claim 9, characterized in that: The direction of the pneumatic friction force when the reel winds back the refueling hose is downward along the axial direction of the refueling hose. The formula for calculating the pneumatic friction force is:

12. The aircraft soft refueling system reel winding torque calculation system as described in claim 9, characterized in that: The angle of the refueling hose is selected as twice the angle of attack of the refueling hose under equilibrium conditions; according to Newton's second law, the formula for calculating the winding torque of the reel is as follows: 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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