Inflatable wing structure capable of being unfolded and folded for multiple times based on rope traction

Abstract

An inflatable wing structure capable of being unfolded and folded for multiple times based on rope traction belongs to the technical field of flexible inflatable wings and comprises a plurality of rib plates which are used as a supporting frame to be mounted in an inflatable wing and fixed with inflatable wing surfaces located on the upper side and the lower side through thin ropes to divide the interior of the inflatable wing into a plurality of independent cavities; the plurality of ropes are respectively arranged in the cavities and are used for carrying out wing surface folding action under the action of traction force; the sleeves are arranged on the inner sides of the inflatable wing skins of the cavities at intervals and used for allowing the ropes to penetrate through, and one rope is arranged in each cavity, completely penetrates through the inflatable wing surface on the upper side to the inflatable wing surface on the lower side and is connected with the skins. The pre-tightening force is stored by unfolding the inflatable wing, and the inflatable wing is automatically retracted to the wing surface after the force is unloaded, so that the inflatable wing can be repeatedly unfolded and folded for use, and the use efficiency of the inflatable wing is greatly improved.

Description

Technical Field

[0001] This invention relates to a reusable inflatable wing structure based on rope traction, belonging to the field of flexible inflatable wing technology. Background Technology

[0002] With the increasing demand for performance enhancements in various aircraft, the applications of flexible inflatable wings are becoming more diverse. Flexible inflatable wings can be deployed from a folded state to a fully extended state on the airframe, thereby improving the lift-to-drag ratio. They offer technical advantages such as low weight cost, high deployment-to-retraction ratio, and improved aircraft maneuverability and lift-to-drag ratio, and have been widely used in the optimization design of various low-speed aircraft. However, in the existing application scenarios of flexible inflatable wings, their function is relatively limited, only involving deployment. If a change in aerodynamic shape is required after deployment, only a detachable inflatable wing can be chosen. Summary of the Invention

[0003] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a multi-expansion and retraction inflatable wing structure based on rope traction. The rope is driven by the expansion and contraction of the skin, and the preload of the spring at the end of the rope provides a folding tendency. The skin can be folded during the wing retraction process so that it can be expanded again, which can meet the high mobility requirements of the multi-expansion and retraction of the inflatable wing.

[0004] The technical solution of this invention is: a multi-deployment and retraction inflatable wing structure based on rope traction, comprising: The ribs, which are provided in several parts, are installed inside the inflatable wing as a support frame and are fixed to the inflatable wing surfaces on the upper and lower sides by thin ropes, dividing the interior of the inflatable wing into multiple independent cavities. Several ropes are provided and arranged in each cavity to perform the wing retraction action under the action of traction force; The sleeve is provided in several parts, spaced apart inside the inflatable wing skin of each cavity, for ropes to pass through. There is one rope in each cavity, which passes completely from the upper inflatable wing surface to the lower inflatable wing surface and connects to the skin.

[0005] Furthermore, the skin is divided into a rope folding section and a spring folding section along the unfolding normal.

[0006] Furthermore, the rope folding section is an O-shaped closed loop structure formed by connecting the skin through a hook-and-loop structure for threading the rope. A drive spring is connected at the closed point of the structure to control the unfolding and retraction of the entire rope loop. By stretching the drive spring, the rope at one end of the O-shaped closed loop structure is driven to retract the skin inward.

[0007] Furthermore, one end of the drive spring is fixedly connected to the rib plate, and the other end is connected to the closed section formed by the rope, forming a complete force transmission path. When the inflatable wing is deployed, the rope is in an extended state, the drive spring is stretched and stores preload. When the inflatable wing deflates and releases pressure, the preload of the drive spring drives the skin to move inward and return to the state before deployment, completing the retraction action.

[0008] Furthermore, a folding spring perpendicular to the inflatable wing surface is installed inside the skin of the spring sheet folding section to achieve one-time folding.

[0009] Furthermore, the rear of the inflatable wing surface is a folding end, and the front is a driving end. The folding end is pulled together by a rope, and the driving end is pulled together by a folding spring connected along the thickness direction of the wing surface.

[0010] Furthermore, the support frame has the same rotation center as the leading edge of the inflatable wing.

[0011] The advantages of this invention compared to the prior art are: (1) In this invention, the inflatable wing is deployed to store the pre-tightening force, and the wing surface is automatically retracted after the force is released by the inflatable wing. This enables the inflatable wing to be deployed and retracted multiple times, which greatly improves the efficiency of the inflatable wing. (2) The present invention realizes the folding function of the inflatable wing, and combined with the original unfolding function of the inflatable wing, it enables the aircraft to have higher maneuverability; (3) Compared with other gathering methods, the present invention does not require active control and has a lower weight cost. Attached Figure Description

[0012] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram illustrating the principle of rope retraction. Figure 2 This is a schematic diagram illustrating the connection between the rope and the skin of the present invention; Figure 3 This is a schematic diagram showing the force distribution on the rope and ribs of the present invention. Figure 4 This is a schematic diagram of the reserved interface structure for the skin of the present invention; Figure 5 This is a schematic diagram showing the position of the driving spring in this invention; Figure 6 This is a schematic diagram illustrating the force analysis of the process by which the driving spring retracts the rope according to the present invention. Detailed Implementation

[0013] To better understand the above technical solutions, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solutions of the present invention, rather than limitations on the technical solutions of the present invention. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0014] The following description, in conjunction with the accompanying drawings, provides a more detailed account of an inflatable wing structure based on rope traction for multiple deployment and retrieval, as provided in the embodiments of the present invention. Figure 2 , Figure 3 The specific implementation method may include: several ribs are provided, which are installed inside the inflatable wing as a support frame and are fixed to the inflatable wing surfaces located on the upper and lower sides by thin ropes, dividing the interior of the inflatable wing into multiple independent cavities; several ropes are provided, which are arranged in each cavity and are used to perform the wing surface retraction action under the action of traction force; several sleeves are provided, which are spaced apart on the inner side of the inflatable wing skin of each cavity for the ropes to pass through. There is one rope in a single cavity, which passes completely from the upper inflatable wing surface to the lower inflatable wing surface and is connected to the skin.

[0015] like Figure 5 The skin is divided into a rope folding section and a spring folding section along the unfolding normal. In one possible implementation, the rope folding section is an O-shaped closed-loop structure formed by connecting the skin sections through a hook-and-loop structure with ropes. A drive spring is connected to the closed section of the structure to control the unfolding and retraction of the entire rope loop. By stretching the drive spring, the rope at one end of the O-shaped closed-loop structure causes the skin to retract inward. One end of the drive spring is fixedly connected to the rib plate, and the other end is connected to the closed section formed by the ropes, forming a complete force transmission path. When the inflatable wing unfolds, the rope is in an extended state, the drive spring is stretched and stores preload. When the inflatable wing deflates and releases pressure, the preload of the drive spring causes the skin to move inward to return to its pre-unfolded state, completing the retraction action.

[0016] In one possible implementation, a folding spring perpendicular to the inflatable wing surface is installed inside the skin of the folding section of the spring sheet, enabling a single fold. The rear of the inflatable wing surface is the folding end, and the front is the drive end. The folding end is pulled together by a rope, and the drive end is pulled together by a folding spring connected along the thickness direction of the wing surface.

[0017] In the solution provided by this invention, a rope-traction-based regular folding method for the skin is applicable to inflatable wings with large sweep angles. The principle of this method is V-shaped folding, which reduces the required longitudinal space by folding an arc into multiple fan-shaped forms, thus achieving the folding action of a small space with a large contraction area for the skin within a limited thickness space. First, the entire skin is divided into a rope folding segment and a spring folding segment along the unfolding normal.

[0018] Rope Folding Section: A buckle structure for threading ropes is designed inside the skin, connecting the entire skin into an "O"-shaped closed loop structure. A "drive spring" is connected at the closed point of the structure to control the expansion and contraction of the entire rope loop. By stretching the drive spring, the rope at one end of the "O"-shaped drive is driven to make the skin contract inward. The spring responds quickly during the contraction process.

[0019] Ribs: The rope folding process requires dividing the inflatable wing into several cavities, which are distinguished by ribs as a support frame. The support frame has the same rotation center as the leading edge of the inflatable wing. Spring folding section: Because the size of the contracted section at the angle between the leading edge and the fuselage is small, it is difficult to arrange ropes and other structures. In addition, the tail folding area is small. Therefore, a "one-fold" form is adopted. A "folding spring" perpendicular to the inflatable wing surface is installed inside the skin to achieve one-folding.

[0020] The solution of this invention is: 1) Calculate the number of creases First, determine the single-sided folding depth L and the turning point radius R based on the inflatable wing dimensions; let L be the folding depth, a be the corresponding central angle before folding, and R be the radius of the arc, then the following relationship exists:

[0021] Find the maximum central angle ; Then, by decomposing the sweep angle of the inflatable wing into multiple central angles, the minimum number of folds required can be obtained. .

[0022] 2) Design the trajectory of the rope on the inflatable wing skin based on the number of creases, thereby determining the specific form of each crease and the position of the drive spring; 3) For a typical inflatable flexible skin, the tension required for rope retraction can be considered to be mainly determined by the skin size. The driving force can be determined by multiplying the total length of a single "O"-shaped rope by a coefficient of 50 N / m. This determines the magnitude of the single-fold driving force, which is the maximum force after the spring is stretched. 4) The minimum force required to maintain the folded state of the flexible skin of the inflatable wing can be considered to be consistent with the form of the driving force, with a coefficient of 10 N / m. This determines the minimum force after a single fold, which is the minimum force remaining after the spring is folded. 5) Design the spring based on the determined driving force and spring stroke:

[0023] in For spring stiffness, This is the maximum load on the spring. is the minimum load on the spring, and h is the spring's stroke (determined based on the space inside the inflatable wing). This is the working limit load.

[0024] This allows us to determine the design state of the drive spring.

[0025] 6) The folding spring at the angle between the leading edge and the fuselage can be selected according to the thickness of the inflatable wing surface. The maximum extension length of the spring is the thickness inside the inflatable wing, and the minimum length of the spring is the distance between the two creases after the inflatable wing is folded. The spring stiffness is the same as that of the drive spring.

[0026] like Figure 1 As shown, the inflatable wing is divided into multiple independent chambers by ribs, and ropes are arranged within each chamber to perform the wing retraction action; the connection between the ropes and the skin is as follows. Figure 2 As shown, the inner side of the skin has spaced sleeves for ropes to pass through. Each independent cavity contains a single rope, which passes completely from the upper wing surface to the lower wing surface before being connected to the skin. The force distribution on the wing surface during the rope-driven retraction process is as follows... Figure 3 As shown, the skin is subjected to an inward pulling force, the rope gradually tightens, and at the same time the ribs also gradually gather together as the skin contracts, eventually forming a folded state. like Figure 4 As shown, the rear of the wing is the folding end, and the front part of the compact space is the driving end. The folding end is pulled together by a rope, and the driving end is pulled together by a spring directly connected along the thickness direction of the wing. The connection between the drive spring and the rope is as follows: Figure 5 As shown, one end of the spring is connected and fixed to the rib plate, and the other end is connected to the closed section formed by the rope, thus realizing a complete force transmission path. The force analysis of the process of driving the spring to retract the rope is as follows. Figure 6 As shown, when the inflatable wing is deployed, the rope is in an extended state, the spring is stretched and stores preload. When the inflatable wing is deflated and the preload is released, the spring preload drives the skin to move inward and return to the state before deployment, thus completing the retraction action.

[0027] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A reusable inflatable wing structure based on rope traction, characterized in that, include: The ribs, which are provided in several parts, are installed inside the inflatable wing as a support frame and are fixed to the inflatable wing surfaces on the upper and lower sides by thin ropes, dividing the interior of the inflatable wing into multiple independent cavities. Several ropes are provided and arranged in each cavity to perform the wing retraction action under the action of traction force; The sleeve is provided in several parts, spaced apart inside the inflatable wing skin of each cavity, for ropes to pass through. There is one rope in each cavity, which passes completely from the upper inflatable wing surface to the lower inflatable wing surface and connects to the skin.

2. The inflatable wing structure for multiple deployment and retrieval based on rope traction according to claim 1, characterized in that, The skin is divided into rope folding sections and spring folding sections along the unfolding normal.

3. The inflatable wing structure for multiple deployment and retrieval based on rope traction according to claim 2, characterized in that, The folded section of the rope is an O-shaped closed loop structure formed by connecting the skin through a buckle structure for threading the rope. A drive spring is connected at the closed point of the structure to control the unfolding and retraction of the entire rope loop. By stretching the drive spring, the rope at one end of the O-shaped closed loop structure is driven to cause the skin to retract inward.

4. The inflatable wing structure for multiple deployment and retrieval based on rope traction according to claim 3, characterized in that, One end of the drive spring is fixedly connected to the rib plate, and the other end is connected to the closed section formed by the rope, forming a complete force transmission path. When the inflatable wing is deployed, the rope is in an extended state, the drive spring is stretched and stores preload. When the inflatable wing deflates and releases pressure, the preload of the drive spring drives the skin to move inward and return to the state before deployment, completing the retraction action.

5. The inflatable wing structure for multiple deployment and retrieval based on rope traction according to claim 2, characterized in that, The spring sheet folding section has a folding spring installed inside its skin, perpendicular to the inflatable wing surface, to achieve a single fold.

6. The inflatable wing structure for multiple deployment and retrieval based on rope traction according to claim 5, characterized in that, The inflatable wing has a folding end at the rear and a driving end at the front. The folding end is pulled together by a rope, and the driving end is pulled together by a folding spring connected along the thickness direction of the wing surface.

7. The inflatable wing structure for multiple deployment and retrieval based on rope traction according to claim 1, characterized in that, The support frame has the same rotation center as the leading edge of the inflatable wing.

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