Main parachute group system suitable for large-tonnage reloading air-drop

Abstract

The invention discloses a group umbrella and main umbrella system suitable for large-tonnage reloading air-drop. The main umbrella system comprises a group umbrella system body formed by nine main umbrellas. The main parachute pack connecting rope is connected with the main parachute pack and connected with the main parachute through the parachute top damping connecting rope, the main parachute is connected with the main connecting rope through the main parachute connecting rope, and the brake parachute is connected with the main parachute connecting rope. According to the scheme, the large-tonnage traction capacity is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of large-tonnage heavy-load air drop, in particular to a group-parachute main-parachute system suitable for large-tonnage heavy-load air drop. BACKGROUND

[0002] The main-parachute system, also known as the main-parachute system, is a key component of the air drop system, which is used to control the attitude during the stable descent of the air drop system in the air and to provide air resistance so that it can descend at a predetermined speed. The main-parachute system is generally composed of a group-parachute system formed by a set of guide parachutes and multiple main parachutes, and each main parachute mainly includes a main-parachute bag, a main-parachute canopy, a main-parachute line, and various connecting lines. The number of main parachutes in the group-parachute system is increased or decreased to match different air drop weights.

[0003] Before the present application, the main-parachute system for ten-ton air drop already exists, and the number of main parachutes in the group-parachute system is 2 to 4.

[0004] The current main-parachute system can only meet the requirements of ten-ton air drop system for stable descent in the air. For large-tonnage heavy-load air drop of more than ten tons and up to twenty tons, the requirements for the main-parachute system have changed significantly, and it is not possible to simply increase the number of main parachutes on the ten-ton main-parachute system to achieve this. The following problems need to be solved.

[0005] (1) The unsynchronized opening of the main parachutes significantly increases with the increase in the number of main parachutes;

[0006] (2) The loss coefficient of the group-parachute system significantly increases with the increase in the number of main parachutes;

[0007] (3) The dynamic load of a single parachute opening increases with the increase in the total weight of the air drop to twenty tons;

[0008] (4) The requirement for air stability increases with the increase in the total weight of the air drop.

[0009] The original ten-ton air drop main-parachute system cannot meet the above requirements. SUMMARY

[0010] The purpose of the present application is to provide a main-parachute system that can meet the requirements of ten-ton to twenty-ton air drop.

[0011] The technical solution to achieve the purpose of the present application is a group-parachute main-parachute system suitable for large-tonnage heavy-load air drop, which includes a group-parachute system formed by 9 main parachutes; a main-parachute bag connecting line connects the main-parachute bag and is connected to the main parachute through a parachute top damping connecting line; the main parachute is connected to the main connecting line through a main-parachute connecting line; and a deceleration parachute is connected to the main-parachute connecting line.

[0012] Further, the main parachute is a 760 square meter flat circular parachute.

[0013] Further, the main canopy is used for packing the deceleration parachute, the main parachute and the main parachute connecting rope.

[0014] Further, the main parachute connecting rope is 30 m long.

[0015] Further, the main connecting rope connects the air drop cargo platform, and the length is 2 m or 10 m, which is selected according to the number of main parachutes.

[0016] Further, the parachute top damping connecting rope 3 has three lengths, i.e. 8.5 m, 11.5 m and 14.5 m, which is selected according to the number of main parachutes.

[0017] Further, the side surfaces of adjacent main canopy packs are connected together through the fixed rope buckle.

[0018] Compared with the prior art, the present application has the following advantages: (1) the parallel synchronous opening form of the canopy pack is adopted, so that the requirement of reducing the opening asynchronization is met; and (2) the variable parachute top damping rope length and the variable main connecting rope length are adopted, so that the requirement of reducing the group parachute loss coefficient is met. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of a parachute system.

[0020] Figure 2 It is a packed main canopy.

[0021] Figure 3 It is a main parachute arrangement form 1 on an air drop piece.

[0022] Figure 4 It is a main parachute arrangement form 2 on an air drop piece. DETAILED DESCRIPTION

[0023] The present application is a main parachute system suitable for large-tonnage heavy air drop, which can realize the air stable landing function of large-tonnage heavy air drop of two tons to twenty tons on various transport aircrafts in plain and plateau air drop scenes.

[0024] The present application will be further described below in combination with the drawings and embodiments.

[0025] In combination with Figure 1 , in the drawings, 1. main canopy connecting rope; 2. main canopy; 3. parachute top damping connecting rope; 4. main parachute; 5. main parachute connecting rope; 6. deceleration parachute tear strip; 7. deceleration parachute; 8. main connecting rope.

[0026] In the present application, the main parachute system includes a group parachute system formed by 9 main parachutes, wherein each main parachute includes: a top pulling rope, a main canopy 2, a main parachute 4, a main parachute connecting rope 5, a main connecting rope 8 and a deceleration parachute 4.

[0027] The deceleration umbrella 7 plays a role of reducing the descending speed of the air-dropped goods and stabilizing the attitude of the goods platform during the opening of the main umbrella 4.

[0028] The main umbrella has an area of 760 m2 and is used to provide necessary landing speed for air-dropping of goods. The main umbrella canopy is circular, has a diameter of 31.1 m, a top hole diameter of 1.2 m, and is divided into a canopy width, a closing rope, and 4 groups of umbrella ropes. The canopy is made of silk satin, and a radial reinforcing belt made of silk material is sewn on the canopy.

[0029] The main umbrella bag 2 is used for packaging the deceleration umbrella 7, the main umbrella 4, and the main umbrella connecting rope 5, and ensures a good opening procedure.

[0030] The main umbrella connecting rope 5 has a length of 30 m and is used to increase the length of the main umbrella rope.

[0031] The main connecting rope 8 is used for connecting the main umbrella 4 and the air-dropping goods platform. It has two lengths, 2 m and 10 m, and is selected according to the number of main umbrellas.

[0032] The top hole damping connecting rope 3 is used to pull the top hole when the main umbrella is separated from the umbrella bag. It has three lengths, 8.5 m, 11.5 m, and 14.5 m, and is selected according to the number of main umbrellas.

[0033] The main umbrella system scheme retains the form of the ten-ton main umbrella in the form of a single main umbrella itself, which is a 760 m2 planar circular umbrella, and meets the requirements of using a standard type. The system is redesigned at the system level, and the connection form, binding form, and system length are innovated through a new type of other system, which solves the requirements that cannot be met by the original ten-ton air-dropping main umbrella system.

[0034] (1) The umbrella bag is adopted in a parallel and synchronous opening form to meet the requirement of reducing the asynchronization of opening.

[0035] Referring to Figures 2-4 , during the lifting of the main umbrella bag, due to factors such as arrangement position influence and air flow influence, the lifting process may not be able to keep synchronization. When the lifting is asynchronous, the timing of pulling out the main umbrella from the umbrella bag will exist in sequence, which leads to obvious asynchronization of the full opening of the main umbrella. The present application connects the side surfaces of adjacent main umbrella bags together through a fixed rope buckle without changing the packaging form of the umbrella bag.

[0036] Through simulation calculation and actual experiment verification, the required strength and length of the connection can be obtained. The strength design needs to meet the constraint force when the adjacent main umbrella is lifted, and the required length of the connection needs to meet the role of keeping the synchronization of the opening under the premise of not affecting the opening of the adjacent main umbrella. The selected strength of the fixed rope buckle at the connection point is 450 kgf, and the length is 120 mm.

[0037] (2) The length of the variable top hole damping rope and the length of the variable main connecting rope are adopted in a form to meet the requirement of reducing the group umbrella loss coefficient.

[0038] The selection of reasonable umbrella top damping rope length is the key to ensure reliable work and good resistance characteristics of the multi-umbrella combination. The required pull top length (umbrella top damping rope + main umbrella bag connecting rope length) and the main umbrella projection diameter are calculated by calculating the umbrella projection diameter and arrangement, as shown in the following table.

[0039] Table 1 Relationship between pull top length and umbrella top spacing

[0040]

[0041] According to the above table, the ratio of the umbrella top spacing to the pull top length is between 0.49 and 0.83. According to the ratio of 0.83 when 5 main umbrellas are used, the umbrella top damping rope of the middle piece combination air drop system is designed, and the total length is 22m, which can overcome the interference between the main umbrellas of the multi-umbrella combination, and effectively increase the resistance characteristics of the combined umbrella.

[0042] According to the same way, the total length of the umbrella top damping rope of 6 to 7 main umbrellas is 28m, and the total length of the umbrella top damping rope of 8 to 9 main umbrellas is 34m.

[0043] The main connecting rope length of 2 to 5 main umbrellas is 2m, and the main connecting rope length of 6 to 9 main umbrellas is 10m, so as to change the length of the umbrella top damping rope, ensure the opening stability and the full shape of the umbrella cloth.

[0044] The actual size sample of the scheme has passed the heavy tonnage heavy load air drop verification, and the performance meets the design requirements, has the heavy tonnage traction capacity, and has the ability to stably generate the traction force in the aircraft wake.

Claims

1. A cluster parachute main parachute system suitable for heavy-duty airdrops, characterized in that: The main parachute system includes a group of nine main parachutes; the main parachute pack connecting rope (1) is connected to the main parachute pack (2) and connected to the main parachute (4) through the parachute top damping connecting rope (3); the main parachute (4) is connected to the main connecting rope (8) through the main parachute connecting rope (5); and the deceleration parachute (7) is connected to the main parachute connecting rope (5).

2. The main parachute system for large-tonnage heavy equipment airdrops according to claim 1, characterized in that: The main umbrella is a 760㎡ flat circular umbrella.

3. The main parachute system for large-tonnage heavy equipment airdrops according to claim 1, characterized in that: The main parachute pack (2) is used to pack the deceleration parachute (7), the main parachute (4) and the main parachute connecting rope (5).

4. The main parachute system for large-tonnage heavy equipment airdrops according to claim 1, characterized in that: The main umbrella connecting rope (5) is 30m long.

5. The main parachute system for large-tonnage heavy equipment airdrops according to claim 1, characterized in that: The main connecting rope (8) connects to the airdrop platform. The length is 2m or 10m, depending on the number of main umbrellas.

6. The main parachute system for large-tonnage heavy equipment airdrops according to claim 1, characterized in that: The umbrella top damping connecting rope 3 comes in three lengths: 8.5m, 11.5m, and 14.5m, which should be selected according to the number of main umbrellas.

7. The main parachute system for large-tonnage heavy equipment airdrops according to claim 1, characterized in that: The sides of adjacent main parachute packs are connected together by securing the rope buckles.

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