A combined cushioning airbag active exhaust control system

Abstract

This patent belongs to the field of spacecraft recovery and landing, and relates to a combined cushion airbag active exhaust control system. By building an active exhaust control system composed of a controller, a power supply, a landing sensor, a pressure sensor, an exhaust port cutter, an exhaust port fixing rope, etc., and cooperating with a preset exhaust control strategy, active control of the airbag landing cushioning process is achieved, and the airbag landing cushioning effect is improved. The present invention is mainly composed of a load, a cushion airbag, a controller, a power supply, a landing sensor, an exhaust port, a pressure sensor, an exhaust port cutter, and an exhaust port fixing rope. It has a wide range of applications and a fast actuator response speed. It can be used as a landing cushioning protection for various loads to achieve non-destructive landing of various large-mass aircraft and spacecraft.

Description

Technical Field

[0001] The invention belongs to the technical field of spacecraft recovery and landing, and relates to a combined buffer airbag active exhaust control system. Background Art

[0002] Cushion airbags have the advantages of light weight, good cushioning and folding performance, and low cost. Especially through the combination of multiple cushion airbags, they can effectively achieve landing cushioning for large spacecraft.

[0003] For the cushioning airbag system, landing cushioning overload and landing cushioning process stability are the two most important technical indicators. After the cushioning airbag completes the airbag body design under the constraints of installation layout space, weight, inflation volume and other restrictions, further optimizing its landing cushioning overload and landing cushioning process stability through active exhaust control is a key link and effective means to improve the performance of the cushioning airbag system.

[0004] The deflation timing of the cushion airbag directly affects its landing cushion overload. If the deflation is too late, the gas in the bag will be highly compressed, resulting in an increase in cushion overload. If the deflation is too early, the upward impulse provided by the airbag will be insufficient, resulting in residual speed when the load lands. Active control means are required to select a reasonable deflation timing. On the other hand, for combined cushion airbags, each airbag is independent of each other. When the load has an attitude angle or horizontal speed, it will cause a large difference in the internal pressure of each airbag, forming a large pitch moment, which affects the stability of the landing cushion process. Summary of the invention

[0005] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and propose an active exhaust control system for a combined cushion airbag, to achieve differentiated control of the exhaust timing of the combined cushion airbag, and to improve the stability of the landing cushioning process.

[0006] The technical solution of the present invention is: a combined cushion airbag active exhaust control system, the load is the protection object of the exhaust control system, the exhaust control system includes: a cushion airbag, M landing sensors, N pressure sensors, N exhaust port cutters, N exhaust port fixing ropes, 1 controller, 1 power supply; wherein, M≥3, N is an integer multiple of M;

[0007] The bottom drag pad of the load has a cushioning airbag, which is composed of N evenly distributed independent airbags. M landing sensors are evenly installed on the same circumference of the bottom of the load. The landing sensor has a built-in three-axial overload sensor for real-time monitoring of the three-axial overload of the load at the installation position; a pressure sensor is installed on the upper surface of each independent airbag, and the pressure sensor is used to monitor the internal pressure of the cushioning airbag in real time; each independent airbag of the cushioning airbag is provided with an exhaust port, and the exhaust ports are gathered and tightened and sealed by the exhaust port fixing rope. When the airbag is exhausted outward, the gas inside the airbag is discharged outward through the exhaust port; the exhaust port cutter is a pyrotechnic product. When the power supply is powered by the power supply, the exhaust port cutter works, cuts off the exhaust port fixing rope, and releases the constraint on the exhaust port; the function of the exhaust port fixing rope is to constrain the exhaust port to prevent the exhaust port from exhausting outward before the exhaust port cutter works; the function of the controller is to collect the measurement signals of the landing sensor and the pressure sensor, and determine whether to supply power to the exhaust port cutter; the function of the power supply is to supply power to the landing sensor, the pressure sensor, the exhaust port cutter and the controller;

[0008] The three-axis overload includes vertical Z-axis overload and horizontal X-axis overload and Y-axis overload.

[0009] Furthermore, when N is p times of M, the N independent airbags are divided into M groups, a group of independent airbags includes p adjacent independent airbags, the position of each landing sensor corresponds to a group of independent airbags, and each landing sensor is installed in the middle position of the corresponding group of independent airbags.

[0010] Furthermore, the opening conditions of the cushion airbag exhaust port and the differentiated exhaust opening strategies under different combinations of landing sensor signals and pressure sensor signals are preset through the controller.

[0011] Furthermore, the opening condition of the exhaust port includes: setting a first vertical overload threshold n1, a second vertical overload threshold n2, and a horizontal overload threshold n3, where n1≤0.8*n 1max , n2≤0.7*n 1max , n3≤0.7*n 2max , and n2<n1; where n 1max is the preset maximum value of the vertical overload, n 2max It is the preset maximum value of the combined overload in the horizontal direction of the load.

[0012] Furthermore, the differentiated exhaust opening strategy includes an overload control strategy and a pressure control strategy.

[0013] Furthermore, the overload control strategy specifically includes:

[0014] First, make a preliminary prediction of the wind field at the landing point:

[0015] 1. When the wind speed at the landing point is ≤ the preset wind speed:

[0016] When the vertical overload values ​​of all landing sensors are greater than n1, or the vertical overload values ​​are greater than n2 and the horizontal combined overload values ​​are greater than n3, the exhaust port cutters of all airbags work simultaneously, and each exhaust port starts to exhaust synchronously;

[0017] When the vertical overload values ​​of m landing sensors are all greater than n1, or the vertical overload values ​​of m landing sensors are all greater than n2 and the horizontal combined overload values ​​are all greater than n3, the m×p cushion airbags corresponding to the m landing sensors are first exhausted. At this time, the exhaust port cutters corresponding to the m landing sensors work simultaneously, and after 5 to 15 ms, the remaining exhaust port cutters work simultaneously to achieve different exhaust timings between the airbags; m is a preset value, m≤M-1;

[0018] 2. When the wind speed at the landing point is greater than the preset wind speed:

[0019] When the vertical overload values ​​of all landing sensors are greater than n1, or the vertical overload values ​​are greater than n2 and the horizontal combined overload values ​​are greater than n3, the exhaust port cutters of all airbags work simultaneously, and each exhaust port starts to exhaust synchronously;

[0020] When the vertical overload values ​​of m landing sensors are all greater than n1, or the vertical overload values ​​of m landing sensors are all greater than n2 and the horizontal total overload values ​​are all greater than n3, the m×p buffer airbags corresponding to the m landing sensors will not be exhausted first. At this time, the exhaust port cutters corresponding to the remaining landing sensors will work simultaneously. After 5 to 15 ms, the m×p exhaust port cutters corresponding to the m landing sensors will work simultaneously to achieve different exhaust timings among the airbags.

[0021] Furthermore, the pressure control strategy specifically includes:

[0022] First, make a preliminary prediction of the wind field at the landing point:

[0023] 1. When the wind speed at the landing point is ≤ the preset wind speed: When the vertical overload values ​​of all landing sensors are greater than n1, or the vertical overload values ​​are greater than n2 and the horizontal combined overload values ​​are greater than n3, the exhaust port cutters of all airbags work at the same time, and each exhaust port starts to exhaust synchronously;

[0024] When the vertical overload values ​​of the m landing sensors are all greater than n1, or the vertical overload values ​​of the m landing sensors are all greater than n2 and the horizontal combined overload values ​​are all greater than n3, the measured values ​​of each pressure sensor are read, and the exhaust port cutters corresponding to the m×p pressure sensors with the largest pressure measured values ​​work first, and the remaining exhaust port cutters work simultaneously after 5 to 15 ms, so as to achieve different exhaust timings among the airbags;

[0025] 2. When the wind speed at the landing point is greater than the preset wind speed:

[0026] When the vertical overload values ​​of all landing sensors are greater than n1, or the vertical overload values ​​are greater than n2 and the horizontal combined overload values ​​are greater than n3, the exhaust port cutters of all airbags work simultaneously, and each exhaust port starts to exhaust synchronously;

[0027] When the vertical overload values ​​of the m landing sensors are all greater than n1, or the vertical overload values ​​of the m landing sensors are all greater than n2 and the horizontal total overload values ​​are all greater than n3, read the measurement values ​​of each pressure sensor, and the exhaust port cutters corresponding to the m×p pressure sensors with the largest pressure measurement values ​​will not work first, and the remaining exhaust port cutters will work. After 5 to 15 ms, these m×p pressure sensors will work simultaneously to achieve different exhaust timings among the airbags.

[0028] Furthermore, the buffer airbag is an inflatable structure made of a special spinning material, and the shape of a single airbag is one of a cylindrical shape, a cashew shape or a terrace shape.

[0029] Furthermore, the exhaust port must meet the requirements of achieving effective sealing of the airbag when the airbag has a large internal and external pressure difference, and achieving external exhaust within a preset time after the command is issued; the exhaust port is composed of an airtight film and a flexible cylindrical structure made of a special spinning material. The flexible cylindrical structure is gathered and then tightened through the exhaust port fixing rope to support the airtight film, and effectively seal the exhaust port when there is a large pressure in the airbag; when the exhaust port needs to be vented, the pyrotechnic exhaust port cutter ignites within 5ms after power supply to cut off the exhaust port fixing rope, and the exhaust port airtight film loses support and bursts within 5ms, thereby starting the exhaust port external exhaust function; the preset time range is 5 to 15ms, and the large internal and external pressure difference range is 20kPa to 120kPa.

[0030] Furthermore, based on the exhaust control system, a combined buffer airbag active exhaust control method is provided, comprising the following steps:

[0031] S1. Select the control strategy based on the ground flatness of the expected landing point: when the expected landing point is flat every 100m 2 When there are no more than 20 protrusions on the ground that are more than 30 cm high, the overload control strategy is selected; otherwise, the pressure control strategy is selected;

[0032] S2, determining the vertical direction overload first threshold value n1, the vertical direction overload second threshold value n2, and the horizontal direction overload threshold value n3 under the current test conditions;

[0033] S3, determining the wind field conditions at the expected landing point and selecting the working sequence of the exhaust port cutter;

[0034] S4. According to the control strategy of S1, the threshold of S2 and the working sequence of S3, the exhaust ports of each airbag are controlled to open according to a predetermined sequence to achieve optimized control of the landing cushioning process of the cushioning airbag.

[0035] The beneficial effects of the present invention compared with the prior art are:

[0036] (1) The present invention utilizes the sensitive signals provided by the landing sensor and the pressure sensor to realize real-time monitoring of the load motion state, landing posture and the internal pressure of each airbag, and combines different exhaust control strategies according to different load 3-axis overloads and airbag internal pressure measurement results, thereby reducing the airbag landing cushioning overload and improving the stability of the landing cushioning process.

[0037] (2) The present invention can adjust the load weight and descent speed distribution range that the cushioning airbag can adapt to by adjusting the exhaust port opening overload (n1, n2 and n3), thereby improving the task adaptability of the combined cushioning airbag system.

[0038] (3) The exhaust control system of the present invention responds quickly (about 5 ms) and can meet the requirements of the landing cushioning process for response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the active exhaust control system of the combined cushioning airbag according to the embodiment of the present invention. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings.

[0041] The airbag body is designed according to the load installation layout space, cushion airbag weight and inflation volume and other constraints. Figure 1 The combined cushion airbag active exhaust control system shown.

[0042] like Figure 1 As shown, the exhaust control system of the present invention includes a cushioning airbag 2, a landing sensor 3, a pressure sensor 5, an exhaust port cutter 6, an exhaust port fixing rope 7, a controller 8, and a power supply 9.

[0043] In this embodiment, the bottom drag pad of the load 1 has a cushioning airbag 2, which is composed of 6 evenly distributed independent airbags. The cushioning airbag 2 is an inflatable structure made of special spinning material, and the airbag is generally cylindrical, cashew-shaped or terraced. Three landing sensors 3 are evenly installed on the same circumference at the bottom of the load. The landing sensors 3 have built-in triaxial overload sensors for real-time monitoring of the triaxial overload of the load 1 near the installation position; a pressure sensor 5 is installed on the upper surface of each independent airbag, and the pressure sensor 5 is used to monitor the internal pressure of the buffer airbag 2 in real time; each independent airbag of the buffer airbag 2 is provided with an exhaust port 4, and the exhaust ports 4 are gathered and tightened and sealed by the exhaust port fixing rope 7. When the airbag is exhausted outward, the gas inside the airbag is discharged outward through the exhaust port 4; the exhaust port cutter 6 is a pyrotechnic device. When the power supply is powered, the exhaust port cutter 6 works, cuts off the exhaust port fixing rope 7, and releases the constraint on the exhaust port 4; the function of the exhaust port fixing rope 7 is to constrain the exhaust port 4, and prevent the exhaust port 4 from exhausting outward before the exhaust port cutter 6 works. The function of the controller 8 is to collect the measurement signals of the landing sensor 3 and the pressure sensor 5, and to determine whether to supply power to the exhaust port cutter 6; the function of the power supply 9 is to supply power to the landing sensor 3, the pressure sensor 5, the exhaust port cutter 6 and the controller 8;

[0044] In this embodiment, the six independent airbags are divided into three groups. One group of independent airbags includes two adjacent independent airbags. The position of each landing sensor 3 corresponds to two independent airbags, and each landing sensor 3 is installed in the middle position of the corresponding two independent airbags.

[0045] In this embodiment, the controller is used to preset the opening conditions of the cushion airbag exhaust port 4 and the differentiated exhaust opening strategies under different combinations of the landing sensor 3 signal and the pressure sensor 5 signal.

[0046] The opening condition of the airbag exhaust port 4 includes: setting a first vertical overload threshold value n1, a second vertical overload threshold value n2, and a horizontal combined overload threshold value n3, where n2<n1; the working goal of the combined buffer airbag active exhaust control system of the present invention is to control the vertical and horizontal landing buffer overloads of the protected object, the load 1, within a certain range, respectively, and record n ​​respectively. 1max is the preset maximum value of vertical overload of load 1, n 2max It is the preset maximum value of the combined overload in the horizontal direction of load 1. Generally speaking, n1≤0.8*n 1max , n2≤0.7*n 1max , n3≤0.7*n 2max .

[0047] The differentiated exhaust opening strategy includes an overload control strategy and a pressure control strategy. The overload control strategy is used to estimate the ground flatness of the landing point, that is, every 100m2 The pressure control strategy is used for scenarios where the ground protrusions with a height of more than 30 cm do not exceed 20; the pressure control strategy is used for scenarios where the ground flatness at the expected landing point is poor, that is, every 100m 2 Scenes where there are more than 20 protrusions on the ground that are more than 30cm high.

[0048] During the airbag landing cushioning process, when the preset exhaust port 4 opening condition is reached, each cushion airbag exhaust port 4 is opened to exhaust air according to a preset timing, so as to adjust the internal pressure of each airbag, and then realize the control of the airbag landing cushioning process, which specifically includes the following steps:

[0049] S1. Select the control strategy according to the flatness of the ground at the expected landing point. When the flatness of the ground at the expected landing point is good, that is, every 100m 2 When there are no more than 20 protrusions on the ground that are more than 30 cm high, the overload control strategy is selected, otherwise the pressure control strategy is selected;

[0050] S2, determining the vertical direction overload first threshold value n1, the vertical direction overload second threshold value n2, and the horizontal direction overload threshold value n3 under the current test conditions;

[0051] S3, determine the wind field conditions at the expected landing point and select the working sequence of the exhaust port cutter 6;

[0052] S4. According to the control strategy of S1, the threshold of S2 and the working sequence of S3, each airbag exhaust port 4 is controlled to open according to a predetermined sequence to achieve optimized control of the cushioning airbag landing cushioning process.

[0053] When the control strategy is an overload control strategy, it specifically includes:

[0054] First, make a preliminary prediction of the wind field at the landing point:

[0055] Case 1: When the wind speed at the falling point is ≤4m / s:

[0056] When the vertical overload values ​​of all landing sensors 3 are greater than n1, or the vertical overload values ​​are greater than n2 and the horizontal overload values ​​are greater than n3, the exhaust port cutters 6 of all airbags work simultaneously, and the exhaust ports 4 start to exhaust synchronously.

[0057] When the vertical overload values ​​of the m landing sensors 3 are all greater than n1, or the vertical overload values ​​of the m landing sensors 3 are all greater than n2 and the horizontal combined overload values ​​are all greater than n3, the m×p buffer airbags 2 corresponding to the m landing sensors 3 are first exhausted. At this time, the exhaust port cutters 6 corresponding to the m landing sensors 3 work simultaneously, and after 5 to 15 ms, the remaining exhaust port cutters 6 work simultaneously to achieve different exhaust timings between the airbags; m is a preset value, m≤M-1.

[0058] Case 2: When the wind speed at the falling point is > 4m / s:

[0059] When the vertical overload values ​​of all landing sensors 3 are greater than n1, or the vertical overload values ​​are greater than n2 and the horizontal overload values ​​are greater than n3, the exhaust port cutters 6 of all airbags work simultaneously, and the exhaust ports 4 start to exhaust synchronously.

[0060] When the vertical overload values ​​of the m landing sensors 3 are all greater than n1, or the vertical overload values ​​of the m landing sensors 3 are all greater than n2 and the horizontal total overload values ​​are all greater than n3, the m×p buffer airbags 2 corresponding to the m landing sensors 3 are not exhausted first, and the exhaust port cutters 6 corresponding to the remaining landing sensors 3 work simultaneously. After 5 to 15 ms, the m×p exhaust port cutters 6 corresponding to the m landing sensors 3 work simultaneously to achieve different exhaust timings among the airbags.

[0061] When the control strategy is a pressure control strategy, it specifically includes:

[0062] First, make a preliminary prediction of the wind field at the landing point:

[0063] Case 1: When the wind speed at the falling point is ≤4m / s:

[0064] When the vertical overload values ​​of all landing sensors 3 are greater than n1, or the vertical overload values ​​are greater than n2 and the horizontal overload values ​​are greater than n3, the exhaust port cutters 6 of all airbags work simultaneously, and the exhaust ports 4 start to exhaust synchronously.

[0065] When the vertical overload values ​​of the m landing sensors 3 are all greater than n1, or the vertical overload values ​​of the m landing sensors 3 are all greater than n2 and the horizontal combined overload values ​​are all greater than n3, the measurement values ​​of each pressure sensor 5 are read, and the exhaust port cutters 6 corresponding to the m×p pressure sensors 5 with the largest pressure measurement values ​​work first, and after 5 to 15 ms, the remaining exhaust port cutters 6 work simultaneously to achieve different exhaust timings between the airbags; m is a preset value, ≤M-1.

[0066] Case 2: When the wind speed at the falling point is > 4m / s:

[0067] When the vertical overload values ​​of all landing sensors 3 are greater than n1, or the vertical overload values ​​are greater than n2 and the horizontal overload values ​​are greater than n3, the exhaust port cutters 6 of all airbags work simultaneously, and the exhaust ports 4 start to exhaust synchronously.

[0068] When the vertical overload values ​​of the m landing sensors 3 are all greater than n1, or the vertical overload values ​​of the m landing sensors 3 are all greater than n2 and the horizontal combined overload values ​​are all greater than n3, the measurement values ​​of each pressure sensor 5 are read, and the exhaust port cutters 6 corresponding to the m×p pressure sensors 5 with the largest pressure measurement values ​​do not work first, and the remaining exhaust port cutters 6 work. After 5 to 15 ms, these m×p pressure sensors 5 work simultaneously to achieve different exhaust timings among the airbags.

[0069] The exhaust port 4 described in the present invention needs to meet the requirements of achieving effective sealing of the airbag when the airbag has a large internal and external pressure difference, and achieving external exhaust within 15ms after the command is issued; the exhaust port 4 is composed of an airtight film and a flexible cylindrical structure made of a special spinning material. After the flexible cylindrical structure is gathered, it is tightened through the exhaust port fixing rope 7 to support the airtight film, and effectively seal the exhaust port when there is a large pressure in the airbag. When the exhaust port 4 needs to be exhausted, the pyrotechnic exhaust port cutter 6 will ignite and cut off the exhaust port fixing rope 7 within 5ms after power supply, and the airtight film of the exhaust port 4 will burst within 5ms after losing support, and the external exhaust function of the exhaust port 4 will be started; in this embodiment, the range of the large internal and external pressure difference is 20kPa~120kPa.

[0070] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A combined cushioning airbag active exhaust control system, wherein a load (1) is an object protected by the exhaust control system, characterized in that: include: A cushioning airbag (2), M landing sensors (3), N pressure sensors (5), N exhaust port cutters (6), N exhaust port fixing ropes (7), a controller (8), and a power supply (9); wherein M≥3, and N is an integer multiple of M; The bottom drag pad of the load (1) is provided with a cushioning airbag (2), which is composed of N evenly distributed independent airbags. M landing sensors (3) are evenly installed on the same circumference of the bottom of the load. The landing sensor (3) has a built-in triaxial overload sensor for real-time monitoring of the triaxial overload of the load (1) at the installation position. A pressure sensor (5) is installed on the upper surface of each independent airbag, and the pressure sensor (5) is used to monitor the internal pressure of the cushioning airbag (2) in real time. Each independent airbag of the cushioning airbag (2) is provided with an exhaust port (4), and the exhaust ports (4) are gathered and tightened and sealed by an exhaust port fixing rope (7). When the airbag is exhausted outward, the gas inside the airbag passes through the exhaust port fixing rope (7). The exhaust port (4) discharges gas outwards; the exhaust port cutter (6) is a pyrotechnic device, and when the power supply (9) supplies power to it, the exhaust port cutter (6) works, cuts off the exhaust port fixing rope (7), and releases the constraint on the exhaust port (4); the exhaust port fixing rope (7) has the function of restraining the exhaust port (4) and preventing the exhaust port (4) from exhausting gas outwards before the exhaust port cutter (6) works; the controller (8) has the function of collecting measurement signals of the landing sensor (3) and the pressure sensor (5), and judging whether to supply power to the exhaust port cutter (6); the power supply (9) has the function of supplying power to the landing sensor (3), the pressure sensor (5), the exhaust port cutter (6), and the controller (8); The three-axis overload includes vertical Z-axis overload and horizontal X-axis overload and Y-axis overload; When N is p times of M, the N independent airbags are divided into M groups, a group of independent airbags includes p adjacent independent airbags, the position of each landing sensor (3) corresponds to a group of independent airbags, and each landing sensor (3) is installed at the middle position of the corresponding group of independent airbags; The opening conditions of the cushion airbag exhaust port (4) and the differentiated exhaust opening strategies under different combinations of landing sensor (3) signals and pressure sensor (5) signals are preset through a controller (8); The opening condition of the exhaust port (4) includes: setting a first vertical overload threshold value n1, a second vertical overload threshold value n2, and a horizontal overload threshold value n3, where n1≤0.8*n 1max , n2≤0.7*n 1max , n3≤0.7*n 2max , and n2<n1; where n 1max is the preset maximum value of the vertical overload of load (1), n 2max is the preset maximum value of the combined overload in the horizontal direction of load (1); The differentiated exhaust opening strategy includes an overload control strategy and a pressure control strategy; The overload control strategy specifically includes: First, make a preliminary prediction of the wind field at the landing point:

1. When the wind speed at the landing point is ≤ the preset wind speed: When the vertical overload values ​​of all landing sensors (3) are greater than n1, or the vertical overload values ​​are greater than n2 and the horizontal combined overload values ​​are greater than n3, the exhaust port cutters (6) of all airbags work simultaneously, and the exhaust ports (4) start exhausting synchronously; When the vertical overload values ​​of the m landing sensors (3) are all greater than n1, or the vertical overload values ​​of the m landing sensors (3) are all greater than n2 and the horizontal combined overload values ​​are all greater than n3, the m×p cushioning airbags (2) corresponding to the m landing sensors (3) are first exhausted, and at this time, the exhaust port cutters (6) corresponding to the m landing sensors (3) work simultaneously, and after 5 to 15 ms, the remaining exhaust port cutters (6) work simultaneously to achieve different exhaust timings between the airbags; m is a preset value, m≤M-1; 2. When the wind speed at the landing point is greater than the preset wind speed: When the vertical overload values ​​of all landing sensors (3) are greater than n1, or the vertical overload values ​​are greater than n2 and the horizontal combined overload values ​​are greater than n3, the exhaust port cutters (6) of all airbags work simultaneously, and the exhaust ports (4) start exhausting synchronously; When the vertical overload values ​​of the m landing sensors (3) are all greater than n1, or the vertical overload values ​​of the m landing sensors (3) are all greater than n2 and the horizontal combined overload values ​​are all greater than n3, the m×p cushioning airbags (2) corresponding to the m landing sensors (3) are not exhausted first, and the exhaust port cutters (6) corresponding to the remaining landing sensors (3) work simultaneously. After 5 to 15 ms, the m×p exhaust port cutters (6) corresponding to the m landing sensors (3) work simultaneously to achieve different exhaust timings between the airbags. The pressure control strategy specifically includes: First, make a preliminary prediction of the wind field at the landing point:

1. When the wind speed at the landing point is ≤ the preset wind speed: when the vertical overload values ​​of all landing sensors (3) are greater than n1, or the vertical overload values ​​are greater than n2 and the horizontal combined overload values ​​are greater than n3, the exhaust port cutters (6) of all airbags work simultaneously, and the exhaust ports (4) start exhausting synchronously; When the vertical overload values ​​of the m landing sensors (3) are all greater than n1, or the vertical overload values ​​of the m landing sensors (3) are all greater than n2 and the horizontal combined overload values ​​are all greater than n3, the measured values ​​of each pressure sensor (5) are read, and the exhaust port cutters (6) corresponding to the m×p pressure sensors (5) with the largest pressure measured values ​​work first, and after 5 to 15 ms, the remaining exhaust port cutters (6) work simultaneously, so as to achieve different exhaust timings between the airbags; 2. When the wind speed at the landing point is greater than the preset wind speed: When the vertical overload values ​​of all landing sensors (3) are greater than n1, or the vertical overload values ​​are greater than n2 and the horizontal combined overload values ​​are greater than n3, the exhaust port cutters (6) of all airbags work simultaneously, and the exhaust ports (4) start exhausting synchronously; When the vertical overload values ​​of the m landing sensors (3) are all greater than n1, or the vertical overload values ​​of the m landing sensors (3) are all greater than n2 and the horizontal combined overload values ​​are all greater than n3, the measured values ​​of each pressure sensor (5) are read, and the exhaust port cutters (6) corresponding to the m×p pressure sensors (5) with the largest pressure measured values ​​do not work first, while the remaining exhaust port cutters (6) work. After 5 to 15 ms, these m×p pressure sensors (5) work simultaneously to achieve different exhaust timings between the airbags.

2. The combined cushioning airbag active exhaust control system according to claim 1, characterized in that: The cushioning airbag (3) is an inflatable structure made of a special spun material, and the shape of a single airbag is one of a cylindrical shape, a cashew shape or a terrace shape.

3. The combined cushioning airbag active exhaust control system according to claim 1, characterized in that: The exhaust port (4) must be able to effectively seal the airbag when the airbag has a large internal and external pressure difference, and to exhaust air to the outside within a preset time after the command is issued; the exhaust port (4) is composed of an airtight film and a flexible cylindrical structure made of a special spinning material. The flexible cylindrical structure is gathered and tightened through the exhaust port fixing rope (7) to support the airtight film, and effectively seal the exhaust port when there is a large pressure in the airbag; when the exhaust port (4) needs to be exhausted, the pyrotechnic exhaust port cutter (6) ignites within 5ms after power is supplied to cut off the exhaust port fixing rope (7), and the exhaust port (4) airtight film loses support and bursts within 5ms, thereby starting the exhaust port (4) to exhaust air to the outside; the preset time range is 5 to 15ms, and the large internal and external pressure difference range is 20kPa to 120kPa.

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