System and method for simulating aircraft structural impact testing in adverse marine environments

Abstract

The application provides a simulation system and method for aircraft structure impact test in a harsh marine environment, and belongs to the technical field of aircraft test. The simulation system comprises a mounting frame, a landing gear movably connected to the upper end of the mounting frame, an environment box withdrawing and collecting assembly arranged at the bottom end of the mounting frame, an environment box connected to the environment box withdrawing and collecting assembly, and a comprehensive control assembly arranged on the mounting frame. The landing gear can be subjected to a high-salt and high-humidity environment close to a real situation, so that the service life reduction caused by environmental factors can be found as early as possible in the test, the degree of simulation of the test is enhanced, the drop and swing test research of various landing gear structures considering factors such as high salt, high humidity and temperature difference is met, the consistency between the test and the real operating environment is improved, the reliability of the ground damage simulation test is enhanced, important reference for the life evaluation of the advanced shipborne aircraft landing gear in the service environment is provided, and the simulation system has a wide application prospect.

Description

Technical Field

[0001] This invention belongs to the field of aircraft testing technology, specifically a simulation system and method for aircraft structural impact testing in harsh marine environments. Background Technology

[0002] Unlike the temperate inland environment, the ocean presents carrier-based aircraft with a series of challenges. The high salinity and humidity of the air, along with the large amount of chloride ions in seawater, can damage the passivation film on metal surfaces, making them more susceptible to corrosion. The unpredictable climate of the marine environment, with its frequent sudden temperature changes, means that extreme cold, heat, and alternating temperatures can all negatively impact metals. Carrier-based aircraft differ significantly from land-based aircraft in their takeoff and landing methods; both catapult launches and accelerated landings place extremely high demands on the strength of the landing gear. Therefore, for carrier-based aircraft, the strength performance of the landing gear under long-term exposure to high salinity and humidity is of paramount importance.

[0003] Current landing gear drop and shimmy tests for carrier-based aircraft focus primarily on their impact resistance, neglecting factors such as salt spray corrosion. Furthermore, the relatively warm and dry inland testing environment differs significantly from actual service conditions. While carrier-based aircraft receive proper maintenance from shipboard personnel, the performance degradation of landing gear under prolonged exposure to harsh environments remains a concern. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a simulation system and method for aircraft structural impact testing in harsh marine environments, supporting loading under conditions such as salt spray corrosion, high temperature and humidity, and sudden temperature changes in carrier-based aircraft landing gear drop and oscillation tests.

[0005] The technical solution of the present invention is: an aircraft structural impact test simulation system for harsh marine environments, including a main mounting frame, landing gear movably connected to the upper end of the main mounting frame, an environmental chamber retraction assembly located at the bottom end of the main mounting frame, an environmental chamber connected to the environmental chamber retraction assembly, and an integrated control assembly located on the main mounting frame. The environmental box retraction assembly includes two parallel sliding horizontal frames located on the front and rear sides of the lower end of the main mounting frame, two sliding vertical frames located between the two sliding horizontal frames, and a snap-fit ​​frame on the sliding vertical frames. The two sliding horizontal frames have sliding recesses on opposite sides, and each sliding recess contains a double-threaded connecting rod. One end of each double-threaded connecting rod is connected to a first forward / reverse motor. Each sliding vertical frame has threaded connecting sleeves at both ends that are threadedly connected to the double-threaded connecting rods. The snap-fit ​​frame has through-holes at its upper and lower ends, and a connecting plate is located on the outer wall of the snap-fit ​​frame at the through-hole. A limit mounting plate is vertically connected to the connecting plate via an electric telescopic rod. The side wall of the limit mounting plate has an electromagnetic chuck, and the outer wall of the limit mounting plate is slidably connected to the through-hole. The environmental enclosure is composed of two sub-environmental enclosures that are snapped into two snap-fit ​​frames and have symmetrically distributed openings. The upper end of each sub-environmental enclosure is provided with a snap-fit ​​notch, and the outer wall of the sub-environmental enclosure is provided with a metal layer. The integrated control assembly includes a controller electrically connected to the first forward and reverse motor, the electric telescopic rod, and the electromagnetic chuck; a heater, a cooler, and a salt spray generator located inside the sub-environment chamber and electrically connected to the controller; and a non-contact temperature measuring device located on the side wall of the mounting frame and electrically connected to the controller.

[0006] Furthermore, the main mounting frame is provided with support legs on the left and right sides of its bottom end, and the bottom end of the support legs is provided with a connecting seat assembly. The connecting seat assembly includes a fixed connecting seat with an insertion groove at the upper end, a reinforcing base plate at the bottom end of the fixed connecting seat, a plurality of reinforcing friction blocks on each side wall of the reinforcing base plate, and a plurality of inclined reinforcing plates between the fixed connecting seat and the reinforcing base plate. The bottom end of the support leg is connected to the insertion groove through a plurality of insertion posts.

[0007] Explanation: Inserting the support leg into the insertion groove at the upper end of the fixed connector and fixing it with the insertion post improves the installation reliability of both. The reinforced base plate at the bottom of the fixed connector increases the contact area between the support leg and the ground, improving the installation stability of the main frame. At the same time, several reinforced friction blocks are set on each side wall of the reinforced base plate to increase the friction between the reinforced base plate and the ground, further improving the installation stability of the main frame.

[0008] Furthermore, a sliding groove is provided on the top of the main mounting frame, and the sliding groove is distributed along the width direction of the main mounting frame. A movable mounting plate is slidably connected in the sliding groove by a hydraulic cylinder. The bottom end of the movable mounting plate is provided with a clamping head connected to the upper end of the landing gear.

[0009] Instructions: When installing the landing gear, open the hydraulic cylinder. The compression action of the hydraulic cylinder causes the movable mounting plate to slide backward in the sliding groove, moving the movable mounting plate away from the environmental chamber. This prevents the environmental chamber and other related components from obstructing the normal installation of the landing gear. When the movable mounting plate moves to the installation position, install the landing gear in the clamping head. Then, use the extension action of the hydraulic cylinder to slide the movable mounting plate in the sliding groove to the middle position between the two sub-environmental chambers. Repeat the above steps when disassembling the landing gear. The above process is convenient to operate, ensures that the space required for landing gear installation is met, and avoids collisions with other components.

[0010] Furthermore, each of the sub-environmental boxes is equipped with a salt spray purification component. The salt spray purification component includes a purification box body disposed on the sub-environmental box and having an air outlet on its side wall, a holding box body connected to the purification box body via a connecting pipe, a connecting pipe for connecting the purification box body and the sub-environmental box, a porous adsorption cylinder disposed inside the sub-environmental box and connected to the connecting pipe, and an air pump disposed at the connecting pipe. An electromagnetic valve is disposed in the air outlet.

[0011] Explanation: After the landing gear has undergone salt spray treatment, the salt spray generated between the two sub-environment chambers is purified using a salt spray purification component. The specific process is as follows: The air pump is turned on, and the salt spray generated between the two sub-environment chambers is drawn into the purification chamber through a porous adsorption cylinder and connecting pipe. At this time, the reagents placed in the chamber enter the purification chamber through the connecting pipe and mix with the salt spray until the salt spray gas is completely removed. Finally, the solenoid valve is opened to discharge the gas through the outlet. This process avoids the salt spray from polluting the surrounding air, has the advantages of energy saving and emission reduction, and also avoids corrosion of electrical equipment, thus preventing it from affecting the service life of the electrical equipment.

[0012] Furthermore, an electronic flow meter is installed at the connection between the purification chamber and the holding chamber, a liquid level sensor is installed inside the holding chamber, an infusion pipe is installed inside the purification chamber, and multiple atomizing nozzles are installed at the bottom end of the infusion pipe. Salt spray sensors are installed on the inner walls of both the purification chamber and the sub-environment chamber.

[0013] Explanation: When the reagent added to the container enters the purification chamber through the connecting tube, the flow rate of the added reagent is monitored by an electronic flow meter, which facilitates precise control of the amount of added reagent used, avoids waste, and saves costs. The liquid level sensor facilitates timely detection of the remaining amount of added reagent in the container, allowing for timely replenishment and ensuring the normal operation of the salt spray purification. The added reagent is atomized and evenly dispersed throughout the purification chamber through various atomizing nozzles on the infusion tube, ensuring full contact with the salt spray gas and greatly improving the salt spray purification effect. The salt spray sensor detects the remaining salt spray content in the purification chamber and the sub-environment chamber. When the standard is reached, the salt spray purification component stops working, increasing the automation level of the salt spray purification process.

[0014] Furthermore, the top of the sub-environment box is provided with a rotating mounting frame, which includes multiple horizontal rotating plates that overlap at the center and are distributed in a divergent manner, a connecting vertical rod whose bottom end passes through the center of each horizontal rotating plate and whose upper end is connected to the sub-environment box through a second forward and reverse motor, and a limiting buckle that is locked between the upper and lower ends of the center of each horizontal rotating plate. There are multiple porous adsorption cylinders, each of which is evenly distributed at the bottom of each horizontal rotating plate, and the upper end of each porous adsorption cylinder passes through the horizontal rotating plate and is connected to the connecting pipe through a connecting pipe.

[0015] Explanation: When the salt mist generated between the two sub-environmental chambers is extracted through the porous adsorption cylinder and connecting pipe using the air pump, the second forward and reverse motor is turned on. The second forward and reverse motor drives the connecting vertical rod to rotate. At this time, each horizontal rotating plate and the porous adsorption cylinder located at the bottom of the horizontal rotating plate rotate synchronously. The number and porous structure of the porous adsorption cylinders rapidly extract the salt mist generated between the two sub-environmental chambers, greatly improving the extraction rate of salt mist and the efficiency of salt mist purification. At the same time, because each porous adsorption cylinder can rotate with the horizontal rotating plate, it is convenient to quickly extract salt mist from all parts of the two sub-environmental chambers, avoiding incomplete local treatment and improving the salt mist purification effect.

[0016] Furthermore, the porous adsorption cylinder includes an upper connecting ring at the bottom of the transverse rotating plate, an elastic folding sleeve at the bottom of the upper connecting ring, a lower connecting ring at the bottom of the elastic folding sleeve, and a linkage ring located around the upper connecting ring and connected to the lower connecting ring at its bottom end via a micro electric telescopic rod. The elastic folding sleeve is made of elastic material and has small holes evenly distributed on its surface.

[0017] Note: When the porous adsorption cylinder is not in use, the elastic folding sleeve is folded to reduce its space occupation. When the porous adsorption cylinder is in use, the micro electric telescopic rod is opened. The extension action of the micro electric telescopic rod drives the lower connecting ring to move downward, causing the elastic folding sleeve to unfold. At this time, the salt spray can be extracted from each hole on the side wall of the elastic folding sleeve and the bottom of the elastic folding sleeve at the same time, which greatly improves the salt spray extraction rate and improves the efficiency of salt spray purification treatment.

[0018] Furthermore, sealing strips are provided on opposite sides of both of the sub-environmental boxes.

[0019] Note: By setting a sealing strip, the sealing performance when the two sub-environmental boxes are connected is increased, which prevents internal salt spray leakage from polluting the surrounding environment and improves the reliability of the device operation.

[0020] This invention also discloses a method for simulating aircraft structural impact tests in harsh marine environments. Based on the aforementioned aircraft structural impact test simulation system for harsh marine environments, the method includes the following steps: S1. Landing gear installation Install the landing gear on the upper end of the main mounting frame, turn on each of the first forward and reverse motors, and drive the double threaded connecting rod to rotate clockwise. At this time, the two threaded connecting sleeves located at the left and right ends of the same double threaded connecting rod approach each other, so that the two sliding vertical frames and the snap-fit ​​frames approach each other. The two sub-environment boxes that snap-fit ​​with the two snap-fit ​​frames also approach each other synchronously until the openings of the two sub-environment boxes contact each other, and the snap-fit ​​notch contacts the landing gear, so that a sealing structure is formed between the two sub-environment boxes. The connection between the sub-environment box and the snap-fit ​​frame is fixed by the adsorption of the metal layer by the electromagnetic chuck. S2. Salt spray immersion treatment of landing gear The salt spray concentration and temperature parameters are set by the controller, the salt spray generator is turned on, salt spray is generated in the two sub-environment chambers, and the landing gear is subjected to salt spray immersion treatment. The temperature in the sub-environment chambers is detected by a non-contact temperature measuring device, and the temperature is adjusted by heaters and coolers. S3, Landing Gear Removal After the landing gear has been immersed in salt spray, the first forward and reverse motors are turned on. The first forward and reverse motors drive the double threaded connecting rod to rotate counterclockwise. The two threaded connecting sleeves at the left and right ends of the same double threaded connecting rod move away from each other, so that the two sliding vertical frames and the snap-fit ​​frame move away from each other, thereby separating the two sub-environmental chambers. Then, the landing gear is removed and subsequent drop and oscillation tests are carried out.

[0021] Compared with the prior art, the beneficial effects of the present invention are: (1) The aircraft structure impact test simulation system of the present invention can apply a high-salt and high-humidity environment close to the real situation to the landing gear, and discover the service life reduction caused by environmental factors as early as possible in the test, enhance the simulation degree of the test, meet the drop and vibration test research of various landing gear structures considering factors such as high salt, high humidity, and temperature difference, improve the consistency between the test and the real operating environment, enhance the credibility of ground damage simulation test, provide an important reference for the service life assessment of advanced carrier-based aircraft landing gear in the service environment, and has broad application prospects.

[0022] (2) The environmental box retraction assembly of the present invention uses a snap-fit ​​frame to initially fix and clamp the sub-environmental box. At the same time, in order to increase stability, limit mounting plates are set at the upper and lower ends of the snap-fit ​​frame, and a metal layer is set at the corresponding position of the sub-environmental box. The sub-environmental box is fixed for the second time by the electromagnetic chuck on the side wall of the limit mounting plate, which further increases the reliability of the connection between the snap-fit ​​frame and the sub-environmental box. When it is necessary to drive the two sub-environmental boxes to move closer or further away from each other, the first forward and reverse motor drives the double threaded connecting rod to rotate, and the threaded connecting sleeves on the same double threaded connecting rod move closer or further away from each other. At this time, the two sub-environmental boxes and the snap-fit ​​frame can move synchronously. The environmental box retraction assembly has the advantages of reliable clamping, automatic operation, and convenient installation and disassembly. Attached Figure Description

[0023] Figure 1 This is a flowchart of the simulation method of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a top view of the environmental chamber retraction assembly of the present invention; Figure 4 This is a schematic diagram of the sliding vertical frame of the present invention; Figure 5 This is a bottom view of the mounting frame of the present invention; Figure 6 This is a schematic diagram of the internal structure of the two sub-environmental boxes of the present invention when they are in contact; Figure 7 This is a schematic diagram of the structure of the porous adsorption cylinder of the present invention when it is installed on a horizontal rotating plate; Among them, 1-Main mounting frame, 10-Support leg, 100-Plug-in column, 11-Connecting seat assembly, 110-Fixed connecting seat, 1100-Plug-in groove, 111-Reinforced base plate, 112-Reinforced friction block, 113-Inclined reinforcement plate, 12-Sliding groove, 120-Hydraulic cylinder, 121-Moving mounting plate, 122-Clamping head, 2-Landing gear, 3-Environmental box retraction assembly, 30-Sliding cross frame, 300-Sliding notch, 301-Double threaded connecting rod, 302-First forward and reverse motor, 31-Sliding vertical frame, 310-Threaded connecting sleeve, 32-Snap-fit ​​frame, 320-Through opening, 321-Connecting plate, 322-Electric telescopic rod, 323-Limiting mounting plate, 324-Electromagnetic chuck, 4-Environmental box, 40-Sub-environmental box, 400-Metal layer, 41-Snap-fit ​​notch, 42 - Salt spray purification components, 420- Purification chamber, 4200- Air outlet, 4201- Solenoid valve, 421- Container, 422- Connecting pipe, 423- Porous adsorption cylinder, 4230- Upper connecting ring, 4231- Elastic folding sleeve, 4232- Lower connecting ring, 4233- Linkage ring, 424- Air pump, 425- Electronic flow meter, 426- Liquid level sensor, 427- Infusion pipe, 428- Atomizing nozzle, 429- Salt spray sensor, 43- Rotating mounting bracket, 430- Horizontal rotating plate, 431- Connecting vertical rod, 432- Limit buckle, 44- Miniature electric telescopic rod, 45- Second forward and reverse motor, 46- Sealing strip, 5- Integrated control components, 50- Controller, 51- Heater, 52- Cooler, 53- Salt spray generator, 54- Non-contact temperature measuring device. Detailed Implementation

[0024] To further understand the content of the present invention, the present invention will be described in detail below through embodiments.

[0025] Example 1: As Figure 2 As shown, the aircraft structural impact test simulation system for harsh marine environments includes a main mounting frame 1, a landing gear 2 movably connected to the upper end of the main mounting frame 1, an environmental chamber retraction assembly 3 located at the bottom end of the main mounting frame 1, an environmental chamber 4 connected to the environmental chamber retraction assembly 3, and an integrated control assembly 5 located on the main mounting frame 1. like Figure 3 , 4As shown, the environmental box retraction assembly 3 includes two sliding horizontal frames 30 arranged parallel to each other on the front and rear sides of the lower end of the main mounting frame 1, two sliding vertical frames 31 arranged between the two sliding horizontal frames 30, and a snap-fit ​​frame 32 arranged on the sliding vertical frame 31; the two sliding horizontal frames 30 are respectively provided with sliding recesses 300 on opposite sides, and each sliding recess 300 is provided with a double threaded connecting rod 301. One end of the double threaded connecting rod 301 is connected to a first forward and reverse motor 302. Each sliding vertical frame 31 is provided with a threaded connecting sleeve 310 that is threadedly connected to the double threaded connecting rod 301 at both the left and right ends. The snap-fit ​​frame 32 is respectively provided with a through opening 320 at the upper and lower ends, and a connecting plate 321 is provided on the outer wall of the snap-fit ​​frame 32 at the through opening 320. A limiting mounting plate 323 is vertically connected to the connecting plate 321 through an electric telescopic rod 322. An electromagnetic chuck 324 is provided on the side wall of the limiting mounting plate 323. The outer wall of the limiting mounting plate 323 is slidably connected to the through opening 320. The environmental box 4 is composed of two sub-environmental boxes 40 that are snapped into two snap-fit ​​frames 32 and have symmetrically distributed openings. The upper end of the sub-environmental box 40 is provided with a snap-fit ​​notch 41, and the outer wall of the sub-environmental box 40 is provided with a metal layer 400. The integrated control component 5 includes a controller 50 electrically connected to the first forward and reverse motor 302, the electric telescopic rod 322 and the electromagnetic chuck 324, a heater 51, a cooler 52 and a salt spray generator 53 located in the sub-environmental chamber 40 and electrically connected to the controller 50, and a non-contact temperature measuring device 54 located on the side wall of the mounting frame 1 and electrically connected to the controller 50. Both sub-environmental chambers 40 are equipped with sealing strips 46 on opposite sides; Among them, the first forward and reverse motor 302, electric telescopic rod 322, electromagnetic chuck 324, controller 50, heater 51, cooler 52, and salt spray generator 53 all adopt existing technologies, and the non-contact temperature measuring device 54 is an infrared thermometer.

[0026] Example 2: This example discloses a method for simulating aircraft structural impact tests in harsh marine environments, based on the aircraft structural impact test simulation system for harsh marine environments described in Example 1, such as... Figure 1 As shown, it includes the following steps: S1, Installation of landing gear 2 The landing gear 2 is installed on the upper end of the main mounting frame 1. The first forward and reverse motors 302 are turned on, and the double threaded connecting rods 301 are rotated clockwise by the first forward and reverse motors 302. At this time, the two threaded connecting sleeves 310 located at the left and right ends of the same double threaded connecting rod 301 approach each other, so that the two sliding vertical frames 31 and the snap-fit ​​frame 32 approach each other. The two sub-environment boxes 40 that are snapped with the two snap-fit ​​frames 32 also approach each other synchronously until the openings of the two sub-environment boxes 40 contact each other. The snap-fit ​​notch 41 contacts the landing gear 2, so that a sealed structure is formed between the two sub-environment boxes 40. The connection between the sub-environment box 40 and the snap-fit ​​frame 32 is fixed by the adsorption of the electromagnetic chuck 324 and the metal layer 400. Salt spray immersion treatment of S2 and landing gear 2 The salt spray concentration and temperature parameters are set by the controller 50, the salt spray generator 53 is turned on, salt spray is generated in the two sub-environment chambers 40, and the landing gear 2 is subjected to salt spray immersion treatment. The temperature in the sub-environment chambers 40 is detected by the non-contact temperature measuring device 54, and the temperature is adjusted by the heater 51 and the cooler 52. S3, disassembly of landing gear 2 After the landing gear 2 has been immersed in salt spray, turn on each of the first forward and reverse motors 302. The first forward and reverse motors 302 drive the double threaded connecting rod 301 to rotate counterclockwise. The two threaded connecting sleeves 310 located at the left and right ends of the same double threaded connecting rod 301 move away from each other, thereby causing the two sliding vertical frames 31 and the snap-fit ​​frame 32 to move away from each other, and separating the two sub-environmental chambers 40. Then, after the landing gear 2 is removed, subsequent drop and oscillation tests are carried out.

[0027] Example 3: This example differs from Example 1 in that: like Figure 2 As shown, the main frame 1 has support legs 10 on the left and right sides at the bottom. The support legs 10 have a connecting seat assembly 11 at the bottom. The connecting seat assembly 11 includes a fixed connecting seat 110 with an insertion groove 1100 at the upper end, a reinforcing base plate 111 at the bottom of the fixed connecting seat 110, four reinforcing friction blocks 112 on each side wall of the reinforcing base plate 111, and four inclined reinforcing plates 113 between the fixed connecting seat 110 and the reinforcing base plate 111. The bottom of the support legs 10 is connected to the insertion groove 1100 through three insertion posts 100.

[0028] Example 4: This example differs from Example 2 in that: The support leg 10 is inserted into the insertion groove 1100 at the upper end of the fixed connecting seat 110 and fixedly installed by the insertion post 100. The reinforcing base plate 111 at the bottom end of the fixed connecting seat 110 increases the contact area between the support leg 10 and the ground. Several reinforcing friction blocks 112 are set on each side wall of the reinforcing base plate 111 to increase the friction between the reinforcing base plate 111 and the ground.

[0029] Example 5: This example differs from Example 3 in that: like Figure 5 As shown, a sliding groove 12 is provided on the top of the main mounting frame 1, and the sliding groove 12 is distributed along the width direction of the main mounting frame 1. A movable mounting plate 121 is slidably connected in the sliding groove 12 by a hydraulic cylinder 120. The bottom end of the movable mounting plate 121 is provided with a clamping head 122 connected to the upper end of the landing gear 2. The hydraulic cylinder 120 adopts the prior art.

[0030] Example 6: This example differs from Example 4 in that: When installing the landing gear 2, open the hydraulic cylinder 120. The compression action of the hydraulic cylinder 120 causes the movable mounting plate 121 to slide backward in the sliding groove 12, moving the movable mounting plate 121 away from the environmental chamber 4. When the movable mounting plate 121 moves to the installation position, install the landing gear 2 in the clamping head 122. Then, use the extension action of the hydraulic cylinder 120 to slide the movable mounting plate 121 in the sliding groove 12 to the middle position of the two sub-environmental chambers 40. The above steps are repeated when disassembling the landing gear 2.

[0031] Example 7: This example differs from Example 5 in that: like Figure 6 , 7 As shown, each sub-environmental chamber 40 is equipped with a salt spray purification component 42. The salt spray purification component 42 includes a purification chamber 420 disposed on the sub-environmental chamber 40 and having an air outlet 4200 on its side wall, a holding chamber 421 connected to the purification chamber 420 via a connecting pipe, a connecting pipe 422 for connecting the purification chamber 420 and the sub-environmental chamber 40, a porous adsorption cylinder 423 disposed inside the sub-environmental chamber 40 and connected to the connecting pipe 422, and an air pump 424 disposed at the connecting pipe 422. A solenoid valve 4201 is disposed inside the air outlet 4200. An electronic flow meter 425 is provided at the connection between the purification chamber 420 and the holding chamber 421. A liquid level sensor 426 is provided inside the holding chamber 421. An infusion tube 427 is provided inside the purification chamber 420. Five atomizing nozzles 428 are provided at the bottom of the infusion tube 427. Salt spray sensors 429 are provided on the inner walls of both the purification chamber 420 and the sub-environment chamber 40. The sub-environment box 40 has a rotating mounting frame 43 at its top. The rotating mounting frame 43 includes four horizontal rotating plates 430 that overlap at the center and are distributed in a radiating pattern, a connecting vertical rod 431 whose bottom end passes through the center of each horizontal rotating plate 430 and whose upper end is connected to the sub-environment box 40 through a second forward and reverse motor 45, and a limiting buckle 432 that is snapped between the upper and lower ends of the center of each horizontal rotating plate 430. There are eight porous adsorption cylinders 423. The eight porous adsorption cylinders 423 are evenly distributed at the bottom of each horizontal rotating plate 430, and the upper end of each porous adsorption cylinder 423 passes through the horizontal rotating plate 430 and is connected to the connecting pipe 422 through a connecting pipe. The porous adsorption cylinder 423 includes an upper connecting ring 4230 at the bottom of the transverse rotating plate 430, an elastic folding sleeve 4231 at the bottom of the upper connecting ring 4230, a lower connecting ring 4232 at the bottom of the elastic folding sleeve 4231, and a linkage ring 4233 at the periphery of the upper connecting ring 4230 and connected to the lower connecting ring 4232 at the bottom via a micro electric telescopic rod 44. The elastic folding sleeve 4231 is made of elastic material and has small holes evenly distributed on its surface. Among them, the air pump 424, solenoid valve 4201, electronic flow meter 425, liquid level sensor 426, atomizing nozzle 428, salt spray sensor 429, second forward and reverse motor 45, and miniature electric telescopic rod 44 all adopt existing technologies.

[0032] Example 8: This example differs from Example 6 in that: After the landing gear 2 has been treated with salt spray, turn on the air pump 424. The air pump 424 will draw the salt spray generated between the two sub-environmental chambers 40 into the purification chamber 420 through the porous adsorption cylinder 423 and the connecting pipe 422. At this time, the added reagent in the chamber 421 will enter the purification chamber 420 through the connecting pipe and mix with the salt spray until the salt spray gas is cleaned. Finally, open the solenoid valve 4201 and discharge it through the air outlet 4200. When the reagent added from the container 421 enters the purification chamber 420 through the connecting pipe, the flow rate of the added reagent is detected by the electronic flow meter 425, and the remaining amount of added reagent in the container 421 is conveniently and timely detected by the liquid level sensor 426. The added reagent is atomized and evenly dispersed into all parts of the purification chamber 420 through the atomizing nozzles 428 on the infusion pipe 427, and fully contacts the salt mist gas. The remaining salt mist content in the purification chamber 420 and the sub-environment chamber 40 is detected by the salt mist sensor 429. When the standard is reached, the salt mist purification component 42 stops working. When the air pump 424 extracts the salt mist generated between the two sub-environmental chambers 40 through the porous adsorption cylinder 423 and the connecting pipe 422, the second forward and reverse motor 45 is turned on. The second forward and reverse motor 45 drives the connecting vertical rod 431 to rotate. At this time, each horizontal rotating plate 430 and the porous adsorption cylinder 423 located at the bottom of the horizontal rotating plate 430 rotate synchronously. The porous adsorption cylinder 423 and the elastic folding sleeve 4231 quickly extract the salt mist generated between the two sub-environmental chambers 40. Since each porous adsorption cylinder 423 can rotate with the rotation of the horizontal rotating plate 430, it is convenient to quickly extract the salt mist from all parts of the two sub-environmental chambers 40, avoiding incomplete local treatment. When the porous adsorption cylinder 423 is not in use, the elastic folding sleeve 4231 is folded to reduce its space occupation. When the porous adsorption cylinder 423 is in use, the micro electric telescopic rod 44 is opened. The extension of the micro electric telescopic rod 44 drives the lower connecting ring 4232 to move downward, so that the elastic folding sleeve 4231 unfolds. At this time, the salt spray can be extracted from each hole on the side wall of the elastic folding sleeve 4231 and the bottom of the elastic folding sleeve 4231 at the same time.

Claims

1. A simulation system for aircraft structural impact testing in harsh marine environments, characterized in that, It includes a main mounting frame (1), a landing gear (2) movably connected to the upper end of the main mounting frame (1), an environmental box retraction assembly (3) located at the lower end of the main mounting frame (1), an environmental box (4) connected to the environmental box retraction assembly (3), and an integrated control assembly (5) located on the main mounting frame (1). The environmental box retraction assembly (3) includes two sliding horizontal frames (30) arranged parallel to each other on the front and rear sides of the lower end of the mounting frame (1), two sliding vertical frames (31) arranged between the two sliding horizontal frames (30), and a snap-fit ​​frame (32) arranged on the sliding vertical frame (31); the two sliding horizontal frames (30) are respectively provided with sliding recesses (300) on opposite sides, and each sliding recess (300) is provided with a double threaded connecting rod (301), one end of the double threaded connecting rod (301) is connected to a first forward and reverse motor (302), and each sliding vertical frame ( Both ends of the left and right sides of the snap-fit ​​frame (31) are provided with threaded connecting sleeves (310) that are threaded to the double threaded connecting rod (301). The upper and lower ends of the snap-fit ​​frame (32) are respectively provided with through holes (320), and the outer wall of the snap-fit ​​frame (32) and located at the through hole (320) are provided with a connecting plate (321). The connecting plate (321) is vertically connected to a limiting mounting plate (323) via an electric telescopic rod (322). The side wall of the limiting mounting plate (323) is provided with an electromagnetic chuck (324). The outer wall of the limiting mounting plate (323) and the through hole (320) are in sliding fit. The environmental box (4) is composed of two sub-environmental boxes (40) that are snapped into two snap-fit ​​frames (32) and have symmetrically distributed openings. The upper end of the sub-environmental box (40) is provided with a snap-fit ​​notch (41), and the outer wall of the sub-environmental box (40) is provided with a metal layer (400). The integrated control component (5) includes a controller (50) electrically connected to the first forward and reverse motor (302), the electric telescopic rod (322) and the electromagnetic chuck (324), a heater (51), a cooler (52) and a salt spray generator (53) located in the sub-environmental chamber (40) and electrically connected to the controller (50), and a non-contact temperature measuring device (54) located on the side wall of the mounting frame (1) and electrically connected to the controller (50); Each of the sub-environmental boxes (40) is provided with a salt spray purification component (42). The salt spray purification component (42) includes a purification box (420) provided on the sub-environmental box (40) and an air outlet (4200) on its side wall, a holding box (421) connected to the purification box (420) via a connecting pipe, a connecting pipe (422) for connecting the purification box (420) and the sub-environmental box (40), a porous adsorption cylinder (423) provided in the sub-environmental box (40) and connected to the connecting pipe (422), and an air pump (424) provided at the connecting pipe (422). The air outlet (4200) is provided with a solenoid valve (4201). The sub-environmental box (40) is provided with a rotating mounting frame (43) at the top of its interior. The rotating mounting frame (43) includes multiple horizontal rotating plates (430) that overlap at the center and are distributed in a divergent manner, a connecting vertical rod (431) whose bottom end passes through the center of each horizontal rotating plate (430) and whose upper end is connected to the sub-environmental box (40) through a second forward and reverse motor (45), and a limiting buckle (432) that is snapped between the upper and lower ends at the center of each horizontal rotating plate (430). There are multiple porous adsorption cylinders (423), and each porous adsorption cylinder (423) is evenly distributed at the bottom of each horizontal rotating plate (430). The upper end of the porous adsorption cylinder (423) passes through the horizontal rotating plate (430) and is connected to the connecting pipe (422) through a connecting pipe. The porous adsorption cylinder (423) includes an upper connecting ring (4230) at the bottom of the transverse rotating plate (430), an elastic folding sleeve (4231) at the bottom of the upper connecting ring (4230), a lower connecting ring (4232) at the bottom of the elastic folding sleeve (4231), and a linkage ring (4233) located around the upper connecting ring (4230) and connected to the lower connecting ring (4232) at the bottom via a micro electric telescopic rod (44). The elastic folding sleeve (4231) is made of elastic material and has small holes evenly distributed on its surface. Both of the two sub-environmental boxes (40) are provided with sealing strips (46) on opposite sides.

2. The aircraft structural impact test simulation system for harsh marine environments according to claim 1, characterized in that, The main mounting frame (1) is provided with support legs (10) on the left and right sides of the bottom end. The support legs (10) are provided with a connecting seat assembly (11) at the bottom end. The connecting seat assembly (11) includes a fixed connecting seat (110) with a plug groove (1100) at the upper end, a reinforcing base plate (111) at the bottom end of the fixed connecting seat (110), a plurality of reinforcing friction blocks (112) on each side wall of the reinforcing base plate (111), and a plurality of inclined reinforcing plates (113) between the fixed connecting seat (110) and the reinforcing base plate (111). The bottom end of the support leg (10) is connected to the plug groove (1100) through a plurality of plug posts (100).

3. The aircraft structural impact test simulation system for harsh marine environments according to claim 1, characterized in that, The top of the mounting frame (1) is provided with a sliding groove (12), and the sliding groove (12) is distributed along the width direction of the mounting frame (1). A movable mounting plate (121) is slidably connected in the sliding groove (12) by a hydraulic cylinder (120). The bottom of the movable mounting plate (121) is provided with a clamping head (122) connected to the upper end of the landing gear (2).

4. The aircraft structural impact test simulation system for harsh marine environments according to claim 1, characterized in that, An electronic flow meter (425) is provided at the connection between the purification chamber (420) and the holding chamber (421). A liquid level sensor (426) is provided inside the holding chamber (421). An infusion tube (427) is provided inside the purification chamber (420). Multiple atomizing nozzles (428) are provided at the bottom of the infusion tube (427). Salt spray sensors (429) are provided on the inner walls of both the purification chamber (420) and the sub-environmental chamber (40).

5. A method for simulating aircraft structural impact tests in harsh marine environments, based on the aircraft structural impact test simulation system for harsh marine environments as described in any one of claims 1-4, characterized in that, Includes the following steps: S1. Installation of landing gear (2) The landing gear (2) is installed on the upper end of the main mounting frame (1) via the movable mounting plate (121) and hydraulic cylinder (120). The first forward and reverse motors (302) are turned on, and the double threaded connecting rod (301) is rotated clockwise by the first forward and reverse motors (302). At this time, the two threaded connecting sleeves (310) located at the left and right ends of the same double threaded connecting rod (301) approach each other, so that the two sliding vertical frames (31) and the snap-fit ​​frame (32) approach each other. The two sub-environment boxes (40) snapped with the two snap-fit ​​frames (32) also approach each other synchronously until the openings of the two sub-environment boxes (40) contact each other, and the snap-fit ​​notch (41) contacts the landing gear (2), so that a sealed structure is formed between the two sub-environment boxes (40). The connection between the sub-environment box (40) and the snap-fit ​​frame (32) is fixed by the adsorption of the electromagnetic chuck (324) and the metal layer (400). S2, Salt spray immersion treatment of landing gear (2) The salt spray concentration and temperature parameters are set by the controller (50), the salt spray generator (53) is turned on, salt spray is generated in the two sub-environmental chambers (40), and the landing gear (2) is subjected to salt spray immersion treatment. The temperature in the sub-environmental chambers (40) is detected by the non-contact temperature measuring device (54), and the temperature is adjusted by the heater (51) and the cooler (52). S3, Removal of landing gear (2) After the landing gear (2) has been immersed in salt spray, turn on each of the first forward and reverse motors (302). Drive the double threaded connecting rod (301) to rotate counterclockwise through the first forward and reverse motors (302). The two threaded connecting sleeves (310) located at the left and right ends of the same double threaded connecting rod (301) move away from each other, so that the two sliding vertical frames (31) and the snap-fit ​​frame (32) move away from each other, thereby separating the two sub-environmental boxes (40). Then, after the landing gear (2) is removed, subsequent drop and oscillation tests are carried out.

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