A movable external hanging device for a tiltrotor aircraft

Abstract

The present invention discloses a movable external attachment device for a tiltrotor aircraft, relating to the technical field of tiltrotors. The device comprises a movable suspension point structure, a first traction rope, a second traction rope, and an adjustment structure. The movable suspension point structure is used to suspend a suspended object and is slidably connected to a slide rail on a wing. The adjustment structure is located on the wing. One end of the first traction rope and one end of the second traction rope are respectively connected to two ends of the movable suspension point structure. The lengths of the first traction rope and the second traction rope are respectively adjusted by the adjustment structure. By adjusting the lengths of the first traction rope and the second traction rope, the position of the movable suspension point structure can be changed. The movable external attachment device for a tiltrotor aircraft of the present invention can optimize the moment loading of the wing of the tiltrotor aircraft in different transition states.

Description

Technical Field

[0001] The present invention relates to the technical field of tiltrotor aircraft, and in particular to a movable external hanging device for a tiltrotor aircraft. Background Art

[0002] Currently, most helicopter suspension devices are fixed fuselage suspension points, which cannot be adjusted according to changes in flight conditions. Currently, patents for helicopter suspension devices are mainly aimed at optimizing suspension devices with fixed suspension points, such as the display method for helicopter suspension swing monitoring invented by Sun Mingqiang et al. under patent number CN110953991A; a helicopter suspension loading device invented by Xie Qingwei et al. under patent number CN216994852U, which is a new type of pod; and a quick installation plate invented by Wu Xiaotu et al. under patent number CN104118572A, which is used for quick installation of pods. Current aircraft suspension devices are also similar, such as the suspension docking main joint invented by Zhang Shuhuan et al. under patent number CN214986110U; and the aircraft suspension upper joint structure invented by Li Xiaonan et al. under patent number CN203237405U, which are all improvements to fixed suspension devices.

[0003] There are two obvious shortcomings of fixed hanging points: on the one hand, during the tilting process of the tiltrotor aircraft, the load on the wing gradually changes from concentrated force (transmitted to the wing by the rotor through the nacelle) to distributed force (lift). Therefore, the traditional hanging method cannot adjust the position of the hanging point according to the real-time load on the wing during the transition process, and cannot reduce the load on the wing of the transition section of the tiltrotor aircraft; on the other hand, objects of different weights generate different torques on the wing when hung. When the weight of the object increases, the torque on the wing also increases accordingly, which greatly limits the maximum weight of the hanging object and does not take into account the configuration characteristics of the tiltrotor aircraft. Summary of the Invention

[0004] The object of the present invention is to provide a movable external plug-in device for a tiltrotor aircraft, which can optimize the moment loading conditions of the wing of the tiltrotor aircraft when the tiltrotor aircraft is in different transition states.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a movable external hanging device for a tiltrotor aircraft, comprising a movable hanging point structure, a first traction rope, a second traction rope and an adjustment structure. The movable hanging point structure is used to hang hanging objects, and the movable hanging point structure is slidably connected to a slide rail on a wing. The adjustment structure is located on the wing. One end of the first traction rope and one end of the second traction rope are respectively connected to two ends of the movable hanging point structure. The length of the first traction rope and the length of the second traction rope are respectively adjusted by the adjustment structure. By adjusting the length of the first traction rope and the length of the second traction rope, the position of the movable hanging point structure can be changed.

[0007] Preferably, the movable lifting point structure includes a slider and a hook, the hook is used to lift the hanging object, the slider is slidably connected to the slide rail, a groove is provided on the slider, one end of the hook is hinged to the slider, and the hook can be hidden in the groove.

[0008] Preferably, an arc-shaped hole is provided on the slider, and the slide rail is arranged through the arc-shaped hole.

[0009] Preferably, the adjustment structure includes a winch and a motor, the winch is rotatably connected to the wing, the power output end of the motor is connected to the winch, the other end of the first traction rope and the other end of the second traction rope are respectively wound on the winch of the adjustment structure, and the motor drives the winch to rotate to adjust the length of the first traction rope or the second traction rope.

[0010] Preferably, the adjustment structure further includes two guide wheels, and the two guide wheels are respectively located on both sides of the first traction rope or the second traction rope.

[0011] Preferably, the slide rail is located in a slide rail groove provided on the wing.

[0012] Preferably, the slide rail groove is located at the 1 / 4 chord line of the lower wing surface.

[0013] Preferably, a cover plate is provided at the slide rail groove, the cover plate is hinged to the wing, and the cover plate is used to close the slide rail groove.

[0014] Compared with the prior art, the present invention has achieved the following technical effects:

[0015] The movable external hanger device for a tiltrotor aircraft of the present invention adjusts the position of the movable hanging point structure via a first towing rope and a second towing rope, thereby optimizing the moment loading of the wing when the tiltrotor aircraft is in different transition states. The present invention can adjust the moment loading of the wing according to the weight of the hanging object to increase the maximum hanging weight: for hanging objects of different weights, different hanging points can be set during takeoff, thereby reducing the load on the wing root during takeoff and allowing for the lifting of greater weights. For lighter cargo, the hanging point can be appropriately moved outward to increase the hanging torque and balance the lift load on the larger wing; for heavier cargo, the hanging point can be appropriately moved inward to reduce the hanging torque and prevent severe wing overload. The moment loading of the wing can be optimized when the tiltrotor aircraft is in different transition states. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the installation position of the mobile lifting point structure of the present invention (with the cover open);

[0018] Figure 2 This is a front view of the mobile lifting point structure, slide rail, first traction rope and second traction rope of the present invention;

[0019] Figure 3 A top view of the movable lifting point structure and slide rail of the present invention;

[0020] Figure 4 Schematic diagram of the movable lifting point structure, the first traction rope and the second traction rope of the present invention;

[0021] Figure 5 Schematic diagram of the regulating structure of the present invention;

[0022] Figure 6 This is a schematic diagram of the movable lifting point structure of the present invention without any hanging objects (the cover is closed);

[0023] Figure 7 A schematic diagram of a method for using the movable external attachment device for a tiltrotor aircraft according to the present invention;

[0024] Wherein: 1 - Wing, 2.1 - Slide rail, 2.2 - First traction rope, 2.3 - Mobile lifting point structure, 2.4 - Hook, 2.5 - Groove, 2.6 - Mounting slot, 2.7 - Second traction rope, 2.8 - Slider, 2.9 - Arc hole, 3 - Cover, 4 - Aileron, 5 - Nacelle, 6 - Rotor, 7.1 - Guide wheel, 7.2 - Winch, 7.3 - Winch shaft. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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.

[0026] The object of the present invention is to provide a movable external plug-in device for a tiltrotor aircraft, which can optimize the moment loading conditions of the wing of the tiltrotor aircraft when the tiltrotor aircraft is in different transition states.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 7As shown, a tiltrotor is an aircraft that combines the characteristics of a helicopter and a fixed-wing aircraft. It can achieve vertical takeoff and landing in helicopter mode and high-speed forward flight in fixed-wing aircraft mode. A tiltrotor converts between helicopter mode and fixed-wing aircraft mode through transition states, and the aerodynamic characteristics of the tiltrotor 6 in these transition states vary complexly. To address these characteristics, this embodiment provides a movable external attachment device for the tiltrotor, which optimizes the moment loading of the wing 1 during different transition states. The movable external hanging device of the tiltrotor aircraft of this embodiment includes a movable hanging point structure 2.3, a first traction rope 2.2, a second traction rope 2.7 and an adjustment structure. The movable hanging point structure 2.3 is used to hang hanging objects. The movable hanging point structure 2.3 is slidably connected to the slide rail 2.1 on the wing 1. The slide rail 2.1 is located in a slide rail groove opened at the 1 / 4 chord line of the lower wing surface of the wing 1. A cover plate 3 is provided at the slide rail groove. The cover plate 3 is hinged to the wing 1 and can rotate around one long side of the slide rail groove within a range of 180°. The cover plate 3 is used to close the slide rail groove when the movable hanging point structure 2.3 is not hanging, so as to hide the movable hanging point structure 2.3 and prevent the aerodynamic performance of the wing 1 from being affected during normal flight without hanging objects. The adjustment structure is located on the wing 1. The first traction rope 2.2 and the second traction rope 2.7 are steel cables. The first traction rope 2.2 One end of the first traction rope 2.2 and one end of the second traction rope 2.7 are respectively connected to the two ends of the mobile lifting point structure 2.3, and the length of the first traction rope 2.2 and the length of the second traction rope 2.7 are respectively adjusted by an adjustment structure. By adjusting the length of the first traction rope 2.2 and the length of the second traction rope 2.7, the position of the mobile lifting point structure 2.3 is changed. For example, the outward length of the first traction rope 2.2 becomes shorter and the outward length of the second traction rope 2.7 becomes longer, and the mobile lifting point structure 2.3 drives the hanging object to move in one direction; the outward length of the first traction rope 2.2 becomes longer and the outward length of the second traction rope 2.7 becomes shorter, and the mobile lifting point structure 2.3 drives the hanging object to move in another direction; when the position of the mobile lifting point structure 2.3 needs to be fixed, the first traction rope 2.2 and the second traction rope 2.7 are tightened at the same time.

[0029] Specifically, in this embodiment, the movable lifting point structure 2.3 includes a slider 2.8 and a hook 2.4. The hook 2.4 is used to lift the hanging object. The slider 2.8 is provided with an arc-shaped hole 2.8. The slide rail 2.1 is a hollow structure. The slide rail 2.1 passes through the arc-shaped hole 2.8 to realize the sliding connection between the slider 2.8 and the slide rail 2.1, preventing the slider 2.8 from rotating around the slide rail 2.1. A groove 2.5 is provided on the slider 2.8. One end of the hook 2.4 is hinged to the slider 2.8. After the hook 2.4 is rotated, it can be hidden in the groove 2.5. The first traction rope 2.2 and the second traction rope 2.7 pass through the installation groove 2.6 on the slide rail 2.1 and are connected to the slider 2.8 part inside the arc-shaped hole 2.8.

[0030] In this embodiment, the adjustment structure includes a winch 7.2, a motor and two guide wheels 7.1. The winch shaft 7.3 of the winch 7.2 is rotatably connected to the wing 1, and the power output end of the motor is connected to the winch shaft 7.3. The other end of the first traction rope 2.2 and the other end of the second traction rope 2.7 are respectively wound on the winch 7.2 of an adjustment structure. The two guide wheels 7.1 are rotatably connected to the wing 1. The two guide wheels 7.1 are respectively located on both sides of the first traction rope 2.2 or the second traction rope 2.7. The motor drives the winch 7.2 to rotate to adjust the length of the first traction rope 2.2 or the second traction rope 2.7.

[0031] In this embodiment, the movable suspension point structure 2.3 can be fixed at a suitable position on the slide rail 2.1 to prevent the movable suspension point structure 2.3 from moving freely, resulting in constant changes in the load on the wing 1 and affecting the normal flight of the tiltrotor aircraft. The flap-type cover 3 can rotate within a range of 180 degrees. When it rotates to the 180-degree position during forward flight, the cover 3 closes to seal the slide rail groove and reduce air resistance.

[0032] The operating process of the movable external attachment device for a tiltrotor aircraft of this embodiment is as follows: when the tiltrotor aircraft switches from helicopter mode to fixed-wing aircraft mode, the forward flight speed gradually increases, and the nacelle 5 gradually tilts to the same horizontal plane as the wing 1. The control system calculates the lift moment acting on the wing 1, selects a position where the torque generated by the hanging object can balance the lift moment acting on the wing 1, and then moves the movable hanging point structure 2.3 to the corresponding position via the slide rail 2.1 and fixes it.

[0033] The movable external attachment device for the tiltrotor aircraft of this embodiment can achieve dynamic load reduction on the wing 1 during the transition period of the tiltrotor 6: when the tiltrotor aircraft switches from helicopter mode to fixed-wing aircraft mode, the forward flight speed gradually increases, and the nacelle 5 gradually tilts to the same horizontal plane as the wing 1. The control system calculates the lift moment acting on the wing 1, selects a position where the torque generated by the hanging object can balance the lift moment acting on the wing 1, and moves the movable hanging point structure 2.3 to the corresponding position and fixes it by sliding the slider 2.8 on the slide rail 2.1. This ensures that the root torque of the wing 1 is kept as minimal as possible at every moment during the transition state.

[0034] The tiltrotor aircraft's movable external hanger system of this embodiment can adjust the torque applied to wing 1 based on the weight of the hanger to increase the maximum load. Different hang points can be set during takeoff for hangers of different weights, reducing the load on the wing root during takeoff and allowing for heavier loads. For example, for lighter cargo, the hang point can be moved outward to increase the hang torque, thereby balancing the lift load on wing 1. For heavier cargo, the hang point can be moved inward to reduce the hang torque, preventing severe overload on wing 1.

[0035] In this embodiment, the process of moving the mobile suspension point structure 2.3 is as follows: the rotor thrust is calculated based on the total weight of the aircraft and the weight of the suspension object, the torque of the thrust on the wing root is calculated based on the rotor thrust, and the initial position of the suspension point is calculated based on the torque of the thrust on the wing root and the weight of the suspension object; during the nacelle tilting process, the incoming air velocity is measured using an anemometer or other method, the wing lift is calculated based on the incoming air velocity, the moment of the wing lift on the wing root is calculated based on the wing lift, and the next position of the suspension point is calculated based on the torque of the thrust on the wing root and the moment of the wing lift on the wing root, and then the mobile suspension point structure 2.3 is moved; after the mobile suspension point structure 2.3 is moved, the incoming air velocity is remeasured and the position of the mobile suspension point structure 2.3 is calculated in real time.

[0036] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A movable external attachment device for a tiltrotor aircraft, characterized by: The invention comprises a movable lifting point structure, a first traction rope, a second traction rope and an adjustment structure, wherein the movable lifting point structure is used for lifting objects, the movable lifting point structure is slidably connected to a slide rail on a wing, the adjustment structure is located on the wing, one end of the first traction rope and one end of the second traction rope are respectively connected to two ends of the movable lifting point structure, the length of the first traction rope and the length of the second traction rope are respectively adjusted by the adjustment structure, and the position of the movable lifting point structure is changed by adjusting the length of the first traction rope and the length of the second traction rope; The rotor thrust is calculated based on the total weight of the aircraft and the weight of the hanging object, the torque of the thrust on the wing root is calculated based on the rotor thrust, and the initial position of the hanging point is calculated based on the torque of the thrust on the wing root and the weight of the hanging object; during the nacelle tilting process, the incoming flow velocity is measured, the wing lift is calculated based on the incoming flow velocity, the moment of the wing lift on the wing root is calculated based on the wing lift, and the next position of the hanging point is calculated based on the moment of the thrust on the wing root and the moment of the wing lift on the wing root, and then the movable hanging point structure is moved; after the movable hanging point structure is moved, the incoming flow velocity is remeasured, and the position of the movable hanging point structure is calculated in real time.

2. The movable external attachment device for a tiltrotor aircraft according to claim 1, characterized in that: The movable lifting point structure includes a slider and a hook, the hook is used to lift the hanging object, the slider is slidably connected to the slide rail, a groove is provided on the slider, one end of the hook is hinged to the slider, and the hook can be hidden in the groove.

3. The movable external attachment device for a tiltrotor aircraft according to claim 2, characterized in that: The sliding block is provided with an arc-shaped hole, and the slide rail is arranged through the arc-shaped hole.

4. The movable external attachment device for a tiltrotor aircraft according to claim 1, characterized in that: The adjustment structure includes a winch and a motor. The winch is rotatably connected to the wing. The power output end of the motor is connected to the winch. The other end of the first traction rope and the other end of the second traction rope are respectively wound around the winch of the adjustment structure. The motor drives the winch to rotate to adjust the length of the first traction rope or the second traction rope.

5. The movable external attachment device for a tiltrotor aircraft according to claim 1, characterized in that: The adjustment structure further includes two guide wheels, which are respectively located on both sides of the first traction rope or the second traction rope.

6. The movable external attachment device for a tiltrotor aircraft according to claim 1, characterized in that: The slide rail is located in a slide rail groove provided on the wing.

7. The movable external attachment device for a tiltrotor aircraft according to claim 6, characterized in that: The slide rail groove is located at the 1 / 4 chord line of the lower wing surface.

8. The movable external attachment device for a tiltrotor aircraft according to claim 6, characterized in that: A cover plate is provided at the slide rail groove, the cover plate is hinged to the wing, and the cover plate is used to close the slide rail groove.

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