A ram air parachute and method of ram air parachute flare landing
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- AEROSPACE LIFE SUPPORT IND LTD
- Filing Date
- 2023-10-26
- Publication Date
- 2026-06-09
Smart Images
Figure CN117227981B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of ram-air parachutes, and more specifically, to a ram-air parachute and a ram-air parachute swooping landing method. Background Technology
[0002] In addition to its stable gliding performance, a ramjet paraglider can also turn in the air by manipulating one trailing edge of the canopy to pull it down. If both sides of the ramjet paraglider are pulled down simultaneously, it can decelerate while gliding stably. When the maximum distance that both sides of the ramjet paraglider are pulled down reaches its maximum travel, its descent speed and forward speed will both decrease to a minimum. This state is the ramjet paraglider's descent performance.
[0003] During a ramjet descent, the control lines need to be pulled down quickly to change the aerodynamic shape of the canopy. As the canopy's aerodynamic shape changes, the lift and drag coefficients increase rapidly. However, due to inertia, the system's velocity remains high. This high velocity and high lift-drag coefficients generate significant lift and drag on the canopy, minimizing both horizontal and vertical descent velocities. The vertical velocity then begins to increase until a new stable equilibrium is reached. However, because the ramjet descent involves pulling down the control lines on both sides of the trailing edge, which is close to 25% of the chord length, the control travel is long and time-consuming for longer chord lengths, potentially causing the optimal descent landing speed to be missed. Summary of the Invention
[0004] The purpose of this application is to provide a ram-air parachute and a ram-air parachute descent landing method, which can quickly change the aerodynamic shape of the parachute body by using auxiliary shielding of the air inlet at the leading edge of the parachute body and controlling the opening of the pressure relief hole on the upper wing surface, so as to achieve the purpose of instant descent.
[0005] This application is implemented as follows:
[0006] This application provides a ram-air parachute, which includes a parachute body, two trailing edge control lines, and two leading edge pull-down lines. The two trailing edge control lines are respectively connected to the two ends of the trailing edge of the parachute body, and the two leading edge pull-down lines are respectively connected to the two ends of the leading edge of the parachute body through multiple upper wing surface parachute lines. When the leading edge pull-down lines are pulled down, they drive the upper wing surface parachute lines to pull the leading edge of the parachute body to shield the air intake. Multiple pressure relief holes are opened on both sides of the upper wing surface of the parachute body. The parachute body is connected to shielding cloths for sealing each pressure relief hole. Each shielding cloth is connected to an upper wing surface parachute line through a connecting rope. When the leading edge pull-down lines are pulled down, they drive the upper wing surface parachute lines and connecting ropes, causing the shielding cloth to separate from the parachute body and open the corresponding pressure relief hole.
[0007] In some alternative implementations, multiple pressure relief holes are symmetrically arranged on both sides of the upper wing surface.
[0008] In some alternative implementations, the upper wing surface is connected to multiple sets of guide rings that correspond one-to-one with the connecting ropes. Each set of guide rings is arranged at intervals along the length of the corresponding connecting rope, and the connecting rope passes through the corresponding set of guide rings.
[0009] In some alternative implementations, the shielding fabric and the parachute body are detachably connected by Velcro or stitching.
[0010] This application also provides a ram-air parachute sparrow landing method, which includes the following steps:
[0011] When preparing for a descent during steady gliding of the ram-air parachute, pull down the trailing edge control rope while simultaneously pulling down the leading edge pull rope. This causes the leading edge pull rope to pull the leading edge of the parachute body to shield the air intake, and also causes the connecting rope to separate the shielding cloth from the parachute body and open the corresponding pressure relief hole.
[0012] The opening of the pressure relief vents on the upper wing surface and the shielding of the air intakes on the leading edge of the parachute body instantly reduce the horizontal and vertical velocities of the ram-air parachute to their minimum values, which is the optimal time for a ram-air landing.
[0013] The beneficial effects of this application are as follows: The ram-air parachute provided by this application includes a parachute body, two trailing edge control lines and two leading edge pull-down lines. The two trailing edge control lines are respectively connected to the two ends of the trailing edge of the parachute body. The two leading edge pull-down lines are respectively connected to the two ends of the leading edge of the parachute body through multiple upper wing surface parachute lines. When the leading edge pull-down lines are pulled down, they drive the upper wing surface parachute lines to pull the leading edge of the parachute body to shield the air intake. Multiple pressure relief holes are opened on both sides of the upper wing surface of the parachute body. The parachute body is connected to shielding cloths for sealing each pressure relief hole. Each shielding cloth is connected to an upper wing surface parachute line through a connecting rope. When the leading edge pull-down lines are pulled down, they drive the upper wing surface parachute lines and connecting ropes, causing the shielding cloth to separate from the parachute body and open the corresponding pressure relief hole. The ram-air parachute and ram-air parachute descent landing method provided in this application can quickly change the aerodynamic shape of the parachute body by using auxiliary shielding of the leading edge air inlet of the parachute body and controlling the opening of the pressure relief hole on the upper wing surface, so as to achieve the purpose of instant descent. Attached Figure Description
[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0015] Figure 1 This is a structural schematic diagram of a ram-air parachute from a first-view perspective, provided in an embodiment of this application.
[0016] Figure 2This is a structural schematic diagram of a ram-air parachute provided in an embodiment of this application from a second perspective;
[0017] Figure 3 A schematic diagram of the structure when the shielding cloth and the parachute body of the stamped parachute are separated and the pressure relief hole is opened in an embodiment of this application;
[0018] Figure 4 This is a partially enlarged structural diagram of the rammed parachute provided in this application embodiment when the shielding cloth and the parachute body are separated and the pressure relief hole is opened.
[0019] In the diagram: 100, Parachute body; 101, Leading edge; 102, Trailing edge; 110, Trailing edge control line; 120, Leading edge pull-down line; 130, Upper wing surface parachute lines; 140, Upper wing surface; 150, Pressure relief hole; 160, Shielding cloth; 161, Nylon Velcro strap; 162, Nylon Velcro hook strap; 170, Connecting rope; 180, Guide ring. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0023] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0024] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0025] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0026] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0027] The features and performance of the ram-air parachute and ram-air parachute swan landing method of this application will be further described in detail below with reference to embodiments.
[0028] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, this application provides a ram-air parachute, which includes a parachute body 100, two trailing edge control lines 110, and two leading edge pull-down lines 120. The two trailing edge control lines 110 are respectively connected to both ends of the trailing edge 102 of the parachute body 100. The two leading edge pull-down lines 120 are respectively connected to both ends of the leading edge 101 of the parachute body 100 through four upper wing surface parachute lines 130. When the leading edge pull-down lines 120 are pulled down, they drive the upper wing surface parachute lines 130 to pull the leading edge 101 of the parachute body 100 to cover the air inlet of the parachute body 100. Four pressure relief holes 150 communicating with the internal air chamber of the parachute body 100 are respectively opened on both sides of the upper wing surface 140 of the parachute body 100. The pressure relief holes 150 on both sides of the upper wing surface 140 are symmetrically arranged. Eight shielding cloths 160 for sealing each pressure relief hole 150 are respectively connected to the parachute body 100. One side of the shielding cloth 160 A band of Velcro 161 is sewn around the perimeter of the canopy, and a band of Velcro hooks 162 is sewn around the pressure relief hole 150. The canopy 160 is connected to the pressure relief hole 150 via the Velcro 161 and the Velcro hooks 162 around the pressure relief hole 150 to close the pressure relief hole 150. The end of each canopy 160 away from the leading edge 101 is connected to an upper wing surface parachute rope 130 via a connecting rope 170. The upper wing surface 140 is connected to eight sets of guide rings 180 corresponding to the connecting ropes 170. Each set of guide rings 180 includes five guide rings 180 spaced apart along the length of the corresponding connecting rope 170. Each connecting rope 170 passes through the five guide rings 180 of the corresponding set. When the leading edge pull-down rope 120 is pulled down, it drives the upper wing surface parachute rope 130 and the connecting rope 170, causing the canopy 160 to separate from the parachute body 100 and open the corresponding pressure relief hole 150.
[0029] This application also provides a sparrow landing method based on the above-mentioned ram-air parachute, which includes the following steps:
[0030] Before the ram-air parachute body 100 is in a steady gliding state and ready to make a bird landing, the shielding cloth 160 is attached to the nylon hook and loop 162 sewn around the corresponding pressure relief hole 150 by the nylon hook and loop 161 sewn around one side surface and the pressure relief hole 150 is closed. At this time, the connecting ropes 170 connected to each shielding cloth 160 pass through the guide rings 180 of the corresponding group and are connected to a corresponding upper wing surface parachute rope 130 at both ends of the leading edge 101. Neither the leading edge 101 nor the trailing edge 102 is pulled down. When the leading edge pull-down rope 120 and the connecting rope 170 are in a slightly taut state, the upper wing surface parachute rope 130 is still in a slack state.
[0031] When the stun-feathered parachute body 100 is lowered, the user pulls down the trailing edge control rope 110 while simultaneously pulling down the leading edge pull rope 120. As the leading edge pull rope 120 is pulled down, it causes the upper wing surface canopy lines 130 to pull down, and the corresponding connecting ropes 170 to move downwards along the guide rings 180. This causes the connecting ropes 170 to pull the shielding fabric 160 apart from the adhesive force of the Velcro straps 161 and 162, separating them from the upper wing surface 140, thus allowing... When the pressure relief holes 150 on the upper wing surface 140 are opened, the parachute lines 130 on the upper wing surface will pull the upper wing surface 140 at the leading edge 101 to cover the air intake of the leading edge 101. At this moment, due to the simultaneous opening of the pressure relief holes 150 on the top surface of the upper wing surface 140 and the covering of the air intake of the leading edge 101, the aerodynamic performance of the ram-air parachute body 100 changes instantaneously. The horizontal and vertical velocities of the ram-air parachute will decrease instantaneously to their minimum values, which is the optimal time for a ram-air landing.
[0032] The ram-air parachute and swan landing method provided in this application embodiment rapidly changes the aerodynamic performance of the ram-air parachute by assisting in shielding the air inlet of the leading edge 101 of the parachute body 100 and controlling the opening of the pressure relief hole 150 of the upper wing surface 140. This fully utilizes the swan landing performance of the ram-air parachute and has the advantages of easy operation, good effect, and reusability. After use, the shielding cloth 160 can be reattached to the upper wing surface 140 with nylon hook and loop fasteners 161 and nylon hook and loop fasteners 162 and the pressure relief hole 150 can be resealed for repeated use.
[0033] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
Claims
1. A ram-air parachute, comprising a parachute body, two trailing edge control lines, and two leading edge pull-down lines, wherein the two trailing edge control lines are respectively connected to both ends of the trailing edge of the parachute body, characterized in that, Two leading-edge pull cords are connected to both ends of the leading edge of the parachute body via multiple upper wing surface parachute cords. When the leading-edge pull cords are pulled down, they drive the upper wing surface parachute cords to pull the leading edge of the parachute body to shield the air intake. Multiple pressure relief holes are opened on both sides of the upper wing surface of the parachute body. Each parachute body is connected to a shielding cloth for sealing each pressure relief hole. Each shielding cloth is connected to an upper wing surface parachute cord via a connecting cord. When the leading-edge pull cords are pulled down, they drive the upper wing surface parachute cords and the connecting cords, causing the shielding cloth to separate from the parachute body and open the corresponding pressure relief hole. Multiple sets of guide rings are connected to the upper wing surface, each corresponding to a connecting cord. Each set of guide rings is spaced apart along the length of the corresponding connecting cord, and the connecting cord passes through the corresponding set of guide rings.
2. The stamped parachute according to claim 1, characterized in that, Multiple pressure relief holes are symmetrically arranged on both sides of the upper wing surface.
3. The stamped parachute according to claim 1, characterized in that, The shielding fabric and the parachute body are detachably connected by Velcro or stitching.
4. The ram-wing parachute sparrow landing method according to claim 1, characterized in that, It includes the following steps: When preparing for a swan landing while the ram-air parachute is in a steady-state gliding state, the trailing edge control rope is pulled down while the leading edge pull rope is pulled down, causing the leading edge pull rope to pull the leading edge of the parachute body to shield the air intake, and causing the connecting rope to move downward along each set of guide rings to separate the shielding cloth from the parachute body and open the corresponding pressure relief hole. The opening of the pressure relief vent on the upper wing surface and the shielding of the air inlet at the leading edge of the parachute body cause the horizontal and vertical velocities of the ram-air parachute to decrease instantaneously to their minimum values, which is the optimal time for a ram-air landing.