Lifesaving parachute air-drop variable resistance test device and method

Abstract

The invention discloses a lifesaving parachute air-drop variable resistance test device and method, and relates to the field of lifesaving parachute testing. The lifesaving parachute air-drop variable resistance test device comprises a test projectile body, a plurality of resistance fins arranged at intervals in the circumferential direction of the test projectile body, sheet pressing springs in one-to-one correspondence with the resistance fins, at least one hoop and a cutter connected to the test projectile body, each resistance fin extends in the length direction of the test projectile body, and one end of each resistance fin is hinged to the test projectile body; the resistance fins can rotate in the direction close to or away from the test projectile body; two ends of the tablet spring are respectively connected with the test projectile body and the corresponding resistance wing panel, and the tablet spring is used for pushing the corresponding resistance wing panel to rotate to form a preset angle with the test projectile body; the hoop is used for overcoming the elastic force of each tablet spring to fixedly sleeve each resistance fin attached to the outer wall of the middle part of the test projectile body; the cutter is used for cutting off the hoop regularly. According to the lifesaving parachute air-drop variable resistance test device and method, the resistance characteristic of the test projectile body can be regularly adjusted to meet the use requirement of the lifesaving parachute air-drop test.

Description

Technical Field

[0001] The present application relates to the field of life-saving parachute testing, and in particular to a life-saving parachute airdrop variable resistance test device and method. Background Art

[0002] In order to verify the performance of the life-saving parachute, the life-saving parachute needs to be connected to the test device for airdrop. The test device needs to meet the resistance characteristics of 0.2m 2 ~0.4m 2 , weight 100kg ~ 130kg, parachute opening speed (true speed): 150km / h ~ 650km / h, parachute opening height 400m ~ 4000m to meet the needs of life-saving parachute airdrop test.

[0003] At present, traditional rigid dummies and test projectiles are often used as front bodies for airdrop tests. When using rigid dummies, problems such as severe tumbling and poor parachute opening procedures often occur during airdrop. When using test projectiles as front bodies, the drag characteristic is only 0.011m2, which leads to poor deceleration effect, excessive parachute opening speed and force, and the formal performance of lifesaving parachutes cannot be evaluated. Summary of the invention

[0004] The purpose of the present application is to provide a life-saving parachute airdrop variable resistance test device and method, which can adjust the resistance characteristics of the test projectile in a timely manner to meet the use requirements of the life-saving parachute airdrop test and ensure the stability of the test projectile during airdrop.

[0005] This application is implemented as follows: The present application provides a lifesaving parachute airdrop variable resistance test device, which includes a test projectile, and also includes a plurality of resistance fins arranged at intervals along the circumference of the test projectile, a compression spring corresponding to the resistance fins one by one, at least one clamp and a cutter connected to the test projectile, one end of each resistance fin is hinged to the test projectile and is configured to be rotatable in a direction close to or away from the test projectile; the two ends of the compression spring are respectively connected to the test projectile and the corresponding resistance fin, the compression spring is used to push the corresponding resistance fin to rotate to be arranged at a preset angle with the test projectile; the clamp is used to overcome the elastic force of each compression spring to fix each resistance fin fitted to the outer wall of the middle part of the test projectile; the cutter is used to cut off the clamp at a regular time.

[0006] In some optional embodiments, the test projectile body includes a test projectile head, a test projectile middle, a body adapter and a test projectile tail which are connected in sequence, and the test projectile tail is connected to a plurality of tail fins which are arranged at intervals along its circumference.

[0007] In some optional embodiments, the resistance wing is arc-shaped and one end away from the test bullet head is hinged to the outer wall of the middle part of the test bullet.

[0008] In some optional embodiments, the central fixed sleeve of the test projectile is provided with an annular equipment plate, and the equipment plate is connected to at least one counterweight.

[0009] In some optional embodiments, the outer wall of the test projectile is provided with a receiving groove corresponding to the resistance wing one by one, and the resistance wing is received in the corresponding receiving groove when it is rotated to fit the outer wall of the middle part of the test projectile.

[0010] In some optional embodiments, the drag fin extends along the length of the test airframe.

[0011] In some optional embodiments, the outer surface profile of the test projectile is formed by rotating the projectile curve around the X-axis of the plane rectangular coordinate system, and the projectile curve includes a first curve segment, a second curve segment, a third curve segment, a fourth curve segment, a fifth curve segment, a sixth curve segment, a seventh curve segment, an eighth curve segment, a ninth curve segment, a tenth curve segment, an eleventh curve segment, a twelfth curve segment, and a thirteenth curve segment connected in sequence along the positive direction of the X-axis; The first curve is defined by the following formula: x=0, 0≤y≤49.3618; The second curve is defined by the following formula: 0≤x≤323.0641, (x-522.16) 2 +(y-(-665.35)) 2 =783468.92; The third curve is defined by the following formula: 323.0641≤x≤355.0472, y=0.0208x+197.1045; The fourth curve is defined by the following formula: x=355.0472, 204.4878≤y≤274.4795; The fifth curve is defined by the following formula: 354.0472≤x≤364.8727, y=274.4795; The sixth curve is defined by the following formula: 364.8727≤x≤414.0627, (x-356.17) 2 +(y-(-16.00)) 2 =87731.30; The seventh curve is defined by the following formula: 414.06272≤x≤485.365, (x-473.15) 2 +(y-(829.74)) 2 =311806.32; The eighth curve is defined by the following formula: 485.365≤x≤988.3318, y=0.0006x+271.1854; The ninth curve is defined by the following formula: 988.3318≤x≤1101.0523, (x-985.11) 2 +(y-(94.15)) 2 =31563.18; The tenth curve is defined by the following formula: 1101.0523≤x≤1209.1176, (x-1360.70) 2 +(y-(594.47)) 2 =201158.89; The eleventh curve is defined by the following formula: 1209.1176≤x≤1380.7778, (x-1383.77) 2 +(y-(966.85)) 2 =661721.08; The twelfth curve is defined by the following formula: 1380.7778≤x≤2148.9854, y=-0.0493x+221.4867; The thirteenth curve is defined by the following formula: x=2148.9854, 0≤y≤115.5417.

[0012] The present application also provides a lifesaving parachute airdrop variable resistance test method, which comprises the following steps: Use a life-saving parachute to connect the above-mentioned life-saving parachute airdrop variable resistance test device and perform airdrop; The cutter is controlled to cut off the clamp at a preset time, so that each compression spring pushes the corresponding resistance wing to rotate to a preset angle with the test projectile.

[0013] The beneficial effects of the present application are as follows: the life-saving parachute airdrop variable resistance test device provided by the present application includes a test projectile, and also includes a plurality of resistance fins arranged at intervals along the circumference of the test projectile, a compression spring corresponding to the resistance fins one by one, at least one clamp and a cutter connected to the test projectile, each resistance fin extends along the length direction of the test projectile and is configured to be rotatable toward or away from the test projectile; the two ends of the compression spring are respectively connected to the test projectile and the corresponding resistance fin, and the compression spring is used to push the corresponding resistance fin to rotate to a preset angle arrangement with the test projectile; the clamp is used to overcome the elastic force of each compression spring to fix each resistance fin fitted to the outer wall of the middle part of the test projectile; the cutter is used to cut off the clamp at a fixed time. The life-saving parachute airdrop variable resistance test device and method provided by the present application can adjust the resistance characteristics of the test projectile at a fixed time to meet the use requirements of the life-saving parachute airdrop test, and ensure the stability of the test projectile during airdrop. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 A structural schematic diagram of a first use state of a lifesaving parachute airdrop variable resistance test device provided in an embodiment of the present application; Figure 2 A structural schematic diagram of a second use state of the lifesaving parachute airdrop variable resistance test device provided in an embodiment of the present application; Figure 3 A schematic structural diagram of a lifesaving parachute airdrop variable resistance test device provided in another embodiment of the present application; Figure 4 A schematic diagram of a projectile curve of the outer surface contour of a test projectile of a lifesaving parachute airdrop variable resistance test device provided in another embodiment of the present application in a plane rectangular coordinate system.

[0016] In the figure: 100, resistance wing; 110, pressure spring; 120, clamp; 130, cutter; 200, test projectile; 201, first curve; 202, second curve; 203, third curve; 204, fourth curve; 205, fifth curve; 206, sixth curve; 207, seventh curve; 208, eighth curve; 209, ninth curve; 211, tenth curve; 212, eleventh curve; 213, twelfth curve; 214, thirteenth curve; 210, test projectile head; 220, test projectile middle; 230, body socket; 240, test projectile tail; 250, tail fin; 260, equipment plate; 270, counterweight; 280, receiving slot. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0019] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0020] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0021] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0022] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0024] The features and performance of the lifesaving parachute airdrop variable resistance test device and method of the present application are further described in detail below in conjunction with the embodiments.

[0025] like Figure 1 and Figure 2 As shown, an embodiment of the present application provides a lifesaving parachute airdrop variable resistance test device, which includes a test projectile 200, four arc-shaped resistance wings 100 arranged at intervals along the circumference of the test projectile 200, a compression spring 110 corresponding to the resistance wings 100, an annular clamp 120 and a cutter 130 connected to the test projectile 200; wherein, the test projectile 200 includes a test projectile head 210, a test projectile middle part 220, a body sleeve 230 and a test projectile tail part 240 connected in sequence, the test projectile tail part 240 is connected to four tail wings 250 arranged at intervals along its circumference, the four tail wings 250 are arranged in an X shape, and the test projectile middle part 220 is provided with four accommodating grooves 280 corresponding to the resistance wings 100 one by one. Each resistance wing 100 extends along the length direction of the test projectile 200 and one end away from the test projectile head 210 is hinged to the middle part 220 of the test projectile, and the resistance wing 100 can rotate toward or away from the test projectile 200; the two ends of the pressure spring 110 are respectively connected to the test projectile 200 and the corresponding resistance wing 100, and the pressure spring 110 is used to push the corresponding resistance wing 100 to rotate to be arranged at a preset angle with the test projectile 200; when the resistance wing 100 is rotated to fit the middle outer wall of the test projectile 200, it is accommodated in the corresponding accommodating groove 280; the clamp 120 is used to overcome the elastic force of each pressure spring 110 to fit each resistance wing 100 accommodated in the accommodating groove 280 of the middle outer wall of the test projectile 200; the cutter 130 is used to cut off the clamp 120 at a fixed time; the middle part 220 of the test projectile is fixedly sleeved with an annular equipment plate 260.

[0026] The present application also provides a method for testing the variable resistance of a lifesaving parachute airdrop, which comprises the following steps: Step 1: Pack the life-saving parachute in a parachute bag, connect the life-saving parachute control belt of the life-saving parachute to the above-mentioned life-saving parachute airdrop variable resistance test device, and fix the detection equipment on the equipment plate 260 of the life-saving parachute airdrop variable resistance test device for airdrop; Step 2: After the airdrop, the lifesaving parachute opens to drive the test projectile 200 of the lifesaving parachute airdrop variable resistance test device to descend to a preset height within a preset time, and the cutter 130 is controlled to cut off the clamp 120, so that each compression spring 110 pushes the corresponding resistance wing 100 to rotate to a preset angle with the test projectile 200, so that the unfolded resistance wing 100 adjusts the resistance characteristics of the test projectile 200 and then continues to descend for testing.

[0027] The lifesaving parachute airdrop variable resistance test device and method provided in the embodiment of the present application is to hinge a plurality of arc-shaped resistance winglets 100 on the outer wall of the test bomb 200, and use the compression spring 110 to push each resistance winglet 100 to rotate to form a preset angle with the outer wall of the test bomb 200, and then use the clamp 120 to overcome the elastic force of each compression spring 110 to sleeve and fix each resistance winglet 100 that is rotated to fit the outer wall of the middle part of the test bomb 200, and when the test bomb 200 is airdropped, the clamp 120 is cut off by the cutter 130 at a time to stop the set of resistance winglets 100. 00 position, so that the pressure sheet spring 110 pushes each resistance wing 100 to rotate to a preset angle with the outer wall of the test projectile 200, thereby adjusting the resistance characteristics of the test projectile 200 to test different technical conditions, which can not only obtain more comparative test data but also greatly save the test cost. At the same time, the resistance wing 100 can be adjusted to rotate to a preset angle with the outer wall of the test projectile 200 by replacing the pressure sheet spring 110 with different elastic forces to adjust the deployment area of ​​the resistance wing 100 to test the required technical conditions.

[0028] The test projectile 200 includes a test projectile head 210, a test projectile middle part 220, a body sleeve 230 and a test projectile tail 240 which are connected in sequence. The test projectile tail 240 is connected to four tail wings 250 which are arranged at intervals along its circumference. The four tail wings 250 are arranged in an X shape. The tail wings 250 can be used to improve the stability of the test projectile 200 during airdrop, so as to prevent the test projectile 200 from rolling during the airdrop process and affecting the test.

[0029] The middle part 220 of the test projectile is provided with four receiving grooves 280 corresponding to the resistance wing 100 one by one. When the resistance wing 100 is rotated to fit against the outer wall of the middle part of the test projectile 200, it is accommodated in the corresponding receiving groove 280, which can reduce the influence of the resistance wing 100 on the resistance characteristics of the test projectile 200 when it fits against the outer wall of the test projectile 200, thereby ensuring the test accuracy.

[0030] In other optional embodiments, the device plate 260 may also be connected to one, two, three, four or more counterweights; when the number of the counterweight is one, it may be annular and fixedly mounted on the device plate 260; when the number of the counterweight is more than two, each counterweight is connected to the device plate 260 at intervals along the circumferential direction; by arranging one or more counterweights on the device plate 260, the weight of the test bomb 200 can be adjusted to meet different test requirements; Figure 3 The figure is a schematic structural diagram of a device plate 260 connected to two counterweights 270 in a lifesaving parachute airdrop variable resistance test device provided by another embodiment.

[0031] In other optional embodiments, such as Figure 4As shown, the outer surface profile of the test projectile 200 can also be formed by rotating the projectile curve around the X-axis of the plane rectangular coordinate system, and the projectile curve includes a first curve 201, a second curve 202, a third curve 203, a fourth curve 204, a fifth curve 205, a sixth curve 206, a seventh curve 207, an eighth curve 208, a ninth curve 209, a tenth curve 211, an eleventh curve 212, a twelfth curve 213 and a thirteenth curve 214 connected in sequence along the positive direction of the X-axis; The first curve 201 is defined by the following formula: x=0, 0≤y≤49.3618; The second curve 202 is defined by the following formula: 0≤x≤323.0641, (x-522.16) 2 +(y-(-665.35)) 2 =783468.92; The third curve 203 is defined by the following formula: 323.0641≤x≤355.0472, y=0.0208x+197.1045; The fourth curve 204 is defined by the following formula: x=355.0472, 204.4878≤y≤274.4795; The fifth curve 205 is defined by the following formula: 354.0472≤x≤364.8727, y=274.4795; The sixth curve 206 is defined by the following formula: 364.8727≤x≤414.0627, (x-356.17) 2 +(y-(-16.00)) 2 =87731.30; The seventh curve 207 is defined by the following formula: 414.06272≤x≤485.365, (x-473.15) 2 +(y-(829.74)) 2 =311806.32; The eighth curve 208 is defined by the following formula: 485.365≤x≤988.3318, y=0.0006x+271.1854; The ninth curve 209 is defined by the following formula: 988.3318≤x≤1101.0523, (x-985.11) 2 +(y-(94.15)) 2 =31563.18; The tenth curve 211 is defined by the following formula: 1101.0523≤x≤1209.1176, (x-1360.70) 2+(y-(594.47)) 2 =201158.89; The eleventh curve 212 is defined by the following formula: 1209.1176≤x≤1380.7778, (x-1383.77) 2 +(y-(966.85)) 2 =661721.08; The twelfth curve 213 is defined by the following formula: 1380.7778≤x≤2148.9854, y=-0.0493x+221.4867; The thirteenth curve 214 is defined by the following formula: x=2148.9854, 0≤y≤115.5417.

[0032] By limiting the outer surface profile of the test projectile 200 to be formed by rotating a specific projectile curve around the X-axis of the plane rectangular coordinate system, it can ensure that the test projectile 200 has a 0.2m 2 ~0.4m 2 On the one hand, the resistance characteristics can meet the requirements of the airdrop test, and on the other hand, the stability of the test projectile 200 in the airdrop can be improved to prevent the test projectile 200 from rolling during the airdrop and affecting the progress of the test.

[0033] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

Claims

1. A lifesaving parachute airdrop variable resistance test device, comprising a test bomb, characterized in that: It also includes a plurality of resistance wings arranged at intervals along the circumference of the test body, a compression spring corresponding to the resistance wings one by one, at least one clamp and a cutter connected to the test body, one end of each resistance wing is hinged to the test body and is configured to be rotatable toward or away from the test body; the two ends of the compression spring are respectively connected to the test body and the corresponding resistance wing, the compression spring is used to push the corresponding resistance wing to rotate to be arranged at a preset angle with the test body; the clamp is used to overcome the elastic force of each compression spring to fix each resistance wing attached to the middle outer wall of the test body; the cutter is used to cut off the clamp at a regular time.

2. The variable resistance test device for airdrop of lifesaving parachute according to claim 1, characterized in that: The test projectile body comprises a test projectile head, a test projectile middle, a body sleeve and a test projectile tail which are connected in sequence, and the test projectile tail is connected to a plurality of tail fins which are arranged at intervals along its circumference.

3. The variable resistance test device for airdrop of lifesaving parachute according to claim 2, characterized in that: The resistance wing is arc-shaped and one end away from the test bullet head is hinged to the outer wall of the middle part of the test bullet.

4. The variable resistance test device for airdrop of lifesaving parachute according to claim 2, characterized in that: The central fixed sleeve of the test bomb is provided with an annular equipment plate, and the equipment plate is connected with at least one counterweight.

5. The variable resistance test device for airdrop of lifesaving parachute according to claim 1, characterized in that: The outer wall of the test body is provided with a receiving groove corresponding to the resistance wing one by one, and the resistance wing is received in the corresponding receiving groove when it is rotated to fit the outer wall of the middle part of the test body.

6. The variable resistance test device for airdrop of lifesaving parachute according to claim 1, characterized in that: The resistance fin extends along the length direction of the test bomb.

7. The variable resistance test device for airdrop of lifesaving parachute according to claim 1, characterized in that: The outer surface profile of the test projectile is formed by rotating the projectile curve around the X-axis of the plane rectangular coordinate system, and the projectile curve includes a first curve segment, a second curve segment, a third curve segment, a fourth curve segment, a fifth curve segment, a sixth curve segment, a seventh curve segment, an eighth curve segment, a ninth curve segment, a tenth curve segment, an eleventh curve segment, a twelfth curve segment and a thirteenth curve segment connected in sequence along the positive direction of the X-axis; The first curve is defined by the following formula: x=0, 0≤y≤49.3618; The second curve is defined by the following formula: 0≤x≤323.0641, (x-522.16) 2 +(y-(-665.35)) 2 =783468.92; The third curve is defined by the following formula: 323.0641≤x≤355.0472, y=0.0208x+197.1045; The fourth curve is defined by the following formula: x=355.0472, 204.4878≤y≤274.4795; The fifth curve is defined by the following formula: 354.0472≤x≤364.8727, y=274.4795; The sixth curve is defined by the following formula: 364.8727≤x≤414.0627, (x-356.17) 2 +(y-(-16.00)) 2 =87731.30; The seventh curve is defined by the following formula: 414.06272≤x≤485.365, (x-473.15) 2 +(y-(829.74)) 2 =311806.32; The eighth curve is defined by the following formula: 485.365≤x≤988.3318, y=0.0006x+271.1854; The ninth curve is defined by the following formula: 988.3318≤x≤1101.0523, (x-985.11) 2 +(y-(94.15)) 2 =31563.18; The tenth curve is defined by the following formula: 1101.0523≤x≤1209.1176, (x-1360.70) 2 +(y-(594.47)) 2 =201158.89; The eleventh curve is defined by the following formula: 1209.1176≤x≤1380.7778, (x-1383.77) 2 +(y-(966.85)) 2 =661721.08; The twelfth curve is defined by the following formula: 1380.7778≤x≤2148.9854, y=-0.0493x+221.4867; The thirteenth curve is defined by the following formula: x=2148.9854, 0≤y≤115.5417.

8. A lifesaving parachute airdrop variable resistance test method, characterized in that: It includes the following steps: Use a life-saving parachute to connect to the life-saving parachute airdrop variable resistance test device as described in any one of claims 1 to 7 and perform airdrop; The cutter is controlled to cut off the clamp at a preset time, so that each of the compression springs pushes the corresponding resistance wing to rotate to form a preset angle with the test bomb.

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