Water surface aircraft cabin water entry test device and test method

Abstract

The invention discloses a water surface aircraft cabin water entry test device and a test method, a cabin model is fixed on the bottom surface of a connecting device, pitch adjusting devices comprise length-adjustable rods and length-fixed rods, and the two pitch adjusting devices are respectively arranged on two longitudinal side surfaces of a roll adjusting device located on the cabin model 1. The length-adjustable rod is located at the corresponding position of the transverse rolling adjusting device, the transverse rolling adjusting device is connected to the vertical restraining device, the crane is connected to the throwing truss structure, the lower portion of the crane is connected with the electromagnetic detacher, the electromagnetic detacher is connected with the vertical restraining device through a rope, and the vertical restraining device is connected with the speed monitoring device. A through hole is formed in the speed monitoring device, a speed monitoring mark is fixed to the throwing truss structure, and when the vertical restraining device moves to a set position, the speed monitoring mark is completely displayed in the through hole of the speed monitoring device; a camera system is also included. The test method is convenient, simple and high in universality, and the instantaneous speed of the test model entering water can be monitored.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrodynamic tests, and in particular relates to a water surface aircraft cabin entry water test device and a test method. Background Art

[0002] The study of the entry of a surface aircraft cabin into water is about the nonlinear coupling problems that a structure is subject to after entering the water. This type of problem is difficult to describe using analytical methods, so model testing is an important method for studying the entry of structures into water. The impact phase of the test of the entry of a surface aircraft cabin into water is short, and the velocity accuracy of the cabin when it contacts the water surface is required to be high. In addition, the size range of common surface aircraft cabin models is 0.5 to 3 meters, and the weight range is 100 to 700 kg. The test device should be simple in structure and easy to operate. The several types of water entry devices currently available all have certain defects, cannot take into account both easy operation and full functionality, and cannot cover most of the needs of surface aircraft cabin entry test devices.

[0003] Chinese patent 201610429105.8 provides a multifunctional water entry and slamming test delivery device, which can realize multiple types of water entry and delivery functions through a pair of T-shaped brackets and motors, but the device is relatively bulky and complex in design, and is only suitable for small-sized compartment water entry tests.

[0004] Chinese patent 201811533380.X provides a vertical water entry test device for structures. This solution can realize the vertical water entry test of structures by deploying a truss structure, a vertical motion pulley and corresponding supporting devices. The test device has a simple structure and is relatively easy to install, but has a single function and cannot realize the water entry test of a compartment with an inclined angle. Summary of the invention

[0005] Purpose of the Invention

[0006] In view of the fact that existing surface aircraft cabin entry water test methods cannot take into account the advantages of simple structure and more functions, the test cost is high, and they are not suitable for large-scale surface aircraft cabin entry water test, the present invention provides a surface aircraft cabin entry water test device and test method.

[0007] Inventing technical solutions

[0008] A test device for the entry of a surface aircraft cabin into water comprises a connecting device, a cabin model is fixed on the bottom surface of the connecting device, a pitch adjusting device comprises a length-adjustable rod and a length-fixed rod, two pitch adjusting devices are respectively arranged on two longitudinal sides of a roll adjusting device located on a cabin model 1, the length-adjustable rod is located at a corresponding position of the roll adjusting device, the roll adjusting device is connected to a vertical restraint device, a traveling crane is connected to a launching truss structure, an electromagnetic unhooker is connected to the lower part of the traveling crane, the electromagnetic unhooker is connected to the vertical restraint device through a rope, a speed monitoring device is connected to the vertical restraint device, a through hole is provided on the speed monitoring device, a speed monitoring mark is fixed on the launching truss structure, and when the vertical restraint device moves to a set position, the speed monitoring mark is completely displayed in the through hole of the speed monitoring device; and a camera system for taking photos of the speed mark is also included.

[0009] Preferably, a mounting angle adjustment plate is fixed on the top surface of the roll adjustment device, and two rows of small circular holes are provided on the mounting angle adjustment plate. The centers of the two rows of small circular holes are respectively located on two circular arcs with overlapping centers and different radii, and the two rows of small circular holes are staggered.

[0010] Preferably, an angle fixing plate is fixed on the top surface of the vertical restraint device, the angle fixing plate is arranged at a corresponding position of the installation angle adjustment plate, two small circular holes are opened on the angle fixing plate, and the line connecting the centers of the two small circular holes on the angle fixing plate is along the vertical direction.

[0011] Preferably, the axis of the angle adjustment plate, the axis of the angle fixing plate, and the line connecting the centers of the two small circular holes on the angle fixing plate are all located within the longitudinal symmetry plane of the cabin model 1.

[0012] Preferably, the vertical restraint device is in the shape of a rectangular frame, and the four corners of the vertical restraint device are connected to sliders, which are slidably arranged on vertical slide rails on the delivery truss structure.

[0013] Preferably, the long side of the vertical restraint device is along the transverse direction of the cabin model, and the short side of the vertical restraint device is along the longitudinal direction of the cabin model.

[0014] Preferably, the roll adjustment device is in the shape of a rectangular frame, with the long side of the roll adjustment device along the transverse direction of the cabin model and the short side of the roll adjustment device along the longitudinal direction of the cabin model.

[0015] Preferably, the through hole of the speed monitoring device is a circular hole, and the speed mark is a circle with the same diameter as the through hole of the speed monitoring device. When the bottom end of the cabin model just touches the water surface, the speed mark coincides with the center of the circular hole of the speed monitoring device.

[0016] Preferably, both ends of the auxiliary longitudinal beam are connected to the two long sides of the vertical restraint device, and the auxiliary longitudinal beam is connected to the top surface of the vertical restraint device.

[0017] A test method using a water-surface aircraft cabin entry water test device comprises the following steps:

[0018] Step 1: Adjust the pitch adjustment device and the roll adjustment device to make the cabin model reach the angle required by the working condition, and lift the test device by the overhead crane until the slider fixed on the vertical restraint device is docked with the slide rail fixed on the delivery truss structure;

[0019] Step 2: Lift the test device to the specified height by means of a crane, arrange the speed monitoring mark at the preset position, align the camera system with the speed mark, and start the high-speed camera system and data acquisition system;

[0020] Step 3: When the water surface is calm, the electromagnetic unhooking device can be opened to realize the water entry test of the surface aircraft cabin; the test data is obtained through the data acquisition system, and the speed of the cabin model entering the water is calculated by observing the speed monitoring mark and speed monitoring device in the camera system;

[0021] The method for monitoring the instantaneous speed of the test model when entering the water is as follows. During the test, observation is performed through a camera system. Assuming that there are n photos from the time when the top of the speed mark is at the bottom of the circular hole of the speed monitoring device to the time when the center of the speed mark coincides with the center of the circular hole of the speed monitoring device, the frame rate of the camera system is Nfps, and the diameter of the speed mark is L meters, then the instantaneous speed v of entering the water can be calculated according to the following formula:

[0022]

[0023] The invention has the advantages that the test method is convenient and concise, has strong versatility, and can monitor the instantaneous speed of the test model entering the water. The test device has a simple structure and is easy to disassemble, transport, and adjust the working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the water entry test device for a surface aircraft compartment.

[0025] Figure 2 It is a partial schematic diagram of the surface aircraft compartment water entry test device.

[0026] Figure 3 It is a schematic diagram of the method for adjusting the angle of the pitch adjustment device.

[0027] Figure 4 It is a schematic diagram of the angle adjustment method of the roll adjustment device.

[0028] Figure 5 It is a schematic diagram of the method for monitoring the instantaneous speed of entering water.

[0029] In the figure: 1 cabin model, 2 connecting device, 3 pitch adjustment device, 4 roll adjustment device, 5 vertical restraint device, 6 electromagnetic unhooking device, 7 launching truss structure, 8 crane, 9 slider, 10 slide rail, 11 speed mark, 12 high-speed camera system, 13 data acquisition system, 14 speed monitoring device, 15 launching pool. DETAILED DESCRIPTION

[0030] The present invention is achieved through the following technical solutions.

[0031] A water-entry test device for a surface aircraft cabin comprises a cabin model 1, a connecting device 2, a pitch adjustment device 3, a roll adjustment device 4, a vertical restraint device 5, an electromagnetic unhooking device 6, a launching truss structure 7, a traveling crane 8, a slider 9, a slide rail 10, a speed mark 11, a high-speed camera system 12, a data acquisition system 13, a speed monitoring device 14 and a launching pool 15.

[0032] The cabin model 1 and the connecting device 2 are connected by bolts. In this embodiment, the connecting device 2 includes two longitudinal connecting beams, two transverse beams and four connecting ears. The longitudinal connecting beams and the transverse reinforcing beams are welded and fixed into a rectangular frame. The spacing of the longitudinal connecting beams should be determined according to the size of the cabin.

[0033] In this embodiment, there are two groups of pitch adjustment devices 3, such as Figure 3 As shown, each set of pitch adjustment device 3 includes an adjustment cylinder, an adjustment rod and a connecting rod. One end of the adjustment rod extends into the adjustment cylinder. A plurality of plug holes are provided on the adjustment rod and the adjustment cylinder. Pins are inserted into different plug holes on the adjustment cylinder and the adjustment rod to adjust the length of the adjustment rod extending out of the adjustment cylinder and connect the adjustment cylinder and the adjustment rod. The other ends of the adjustment cylinder and the adjustment rod are connected to the connecting device 2 and the roll adjustment device 4 respectively by bolts. One end of the connecting rod is fixedly connected to the roll adjustment device 4, and the other end is connected to the connecting device 2 by bolts. After installation, one end of the connecting device 2 should only be able to rotate downward.

[0034] In this embodiment, the roll adjustment device 4 includes three longitudinal beams, two transverse beams, two angle adjustment plates, four auxiliary connecting plates, four ears and two bearing bases. The two longitudinal beams and the two transverse beams are connected to form a rectangular frame structure. The remaining longitudinal beam is connected to the middle of the two transverse beams and its axis is located on the longitudinal symmetry plane of the cabin model 1. The angle adjustment plates are fixedly installed at the corresponding positions on the upper end surfaces of the two transverse beams. The axis of the angle adjustment plates is located on the longitudinal symmetry plane of the cabin model 1. The bearing bases are fixedly installed on the lower end surfaces of the two transverse beams. Bearings are arranged at both ends of the shaft, and the bearings are arranged in the bearing bases. The outer sides of the two ends of the two transverse beams are respectively connected to the pitch adjustment device 3 through ears. The adjustment cylinder of the pitch adjustment device 3 is located at the corresponding position on the same side. The four auxiliary connecting plates connected to the outer sides of the two ends of the two transverse beams are respectively connected to the vertical restraint device 5 through bolts. Figure 4As shown, the angle adjustment plate has two rows of circular holes, with the axis as the center, the outer row has five degrees, namely -8°, -4°, 0° (vertical direction), 3°, and 7°, and the inner row has five degrees, namely -6°, -2°, 1°, 5°, and 9°, which can be adjusted from 0° to 9° integer degrees in conjunction with the axis. If necessary, the number of circular holes can be increased while ensuring the normal operation of the device until the working conditions are met. The transverse beam of the roll adjustment device 4 is along the transverse direction of the cabin model 1, and the longitudinal beam is along the longitudinal direction of the cabin model 1.

[0035] The vertical restraint device 5 includes two longitudinal beams, two transverse beams, two angle fixing plates, four auxiliary fixing plates, four lugs, two auxiliary longitudinal beams and two bearing bases. The two longitudinal beams and two transverse beams are connected to form a rectangular frame. The angle fixing plate corresponds to the position of the angle adjustment plate in the roll adjustment device 4. The angle fixing plate has two upper and lower circular holes. The axis of the angle fixing plate and the angle adjustment plate in the roll adjustment device 4 and the center of the two circular holes are all located in the longitudinal symmetry plane of the cabin model 1. The auxiliary longitudinal beam connects the two transverse beams and is located on the top surface of the transverse beam. In this embodiment, two auxiliary longitudinal beams are set. The auxiliary longitudinal beams can increase the strength of the vertical restraint device 5, and can also increase flexible buffers between the auxiliary longitudinal beams to reduce the impact of the iron ring falling after unhooking on the cabin and the test device. Two upper and lower L-shaped plates are arranged on the four corners of the vertical restraint device 5, and the plates are connected to the slider 9 by bolts.

[0036] The speed monitoring device 14 is fixed on the vertical restraint device 5 and is used in conjunction with the speed mark 11. The speed monitoring device 14 is in the form of a plate with a circular hole formed thereon. The speed mark 11 is in the form of a circle with the same diameter as the circular hole of the speed monitoring device 14. The speed mark 11 is made of magnetic material and can be adsorbed on the delivery truss structure 7 without sliding. Figure 5 As shown, in the initial state, the bottom end of the cabin model 1 just touches the water surface. At this time, the speed mark 11 coincides with the center of the circular hole of the speed monitoring device 14.

[0037] The test method using the above device includes the following steps:

[0038] Step 1: Follow Figure 1 As shown, a cabin section model 1, a connecting device 2, a pitch adjustment device 3, a roll adjustment device 4, a vertical restraint device 5, an electromagnetic unhooking device 6 and a crane 8 arranged on a launching truss structure 7 are connected in sequence;

[0039] Step 2: Adjust the pitch adjustment device 3 and the roll adjustment device 4 to the angles required by the working conditions, and slowly lift the test device by means of the overhead crane 8 until the slide block 9 fixed on the vertical restraint device 5 is docked with the slide rail 10 fixed on the delivery truss structure 7;

[0040] Step 3: lift the test device to a specified height by means of a crane 8, arrange a speed monitoring mark 11 at a preset position, arrange a high-speed camera system 12 to align with the speed mark 11, and start the high-speed camera system 12 and the data acquisition system 13;

[0041] Step 4: When the water surface is calm, the electromagnetic unhooking device 6 can be opened to implement the water entry test of the surface aircraft cabin. The test data measured by the sensor on the cabin model 1 is obtained through the data acquisition system 13, and the speed of the cabin model 1 at the moment of entering the water is calculated by observing the speed monitoring mark 11 and the speed monitoring device 14 in the high-speed camera system 12.

[0042] This test device adopts the free fall delivery method, and the water entry speed needs to be converted into the water departure height, which can be calculated according to the following formula:

[0043]

[0044] The method for monitoring the instantaneous speed of the test model when entering the water is as follows. During the test, observation is performed through a high-speed camera system 12. Assuming that there are n photos from the top of the speed mark 11 at the bottom of the circular hole of the speed monitoring device 14 to the time when the center of the speed mark 11 coincides with the center of the circular hole of the speed monitoring device 14, the frame rate of the high-speed camera system 12 is Nfps, and the diameter of the speed mark 11 is L meters, then the instantaneous speed v of entering the water can be calculated according to the following formula:

[0045]

[0046] The protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope of the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these changes and modifications.

Claims

1. A water-entry test device for a surface aircraft cabin, characterized in that: The invention comprises a connecting device (2), a cabin model (1) is fixed on the bottom surface of the connecting device (2), a pitch adjustment device (3) comprises a length-adjustable rod and a length-fixed rod, two pitch adjustment devices (3) are respectively arranged on two longitudinal sides of a roll adjustment device (4) located on the cabin model 1, the length-adjustable rod is located at a corresponding position of the roll adjustment device (4), the roll adjustment device (4) is connected to a vertical restraint device (5), a traveling crane (8) is connected to a delivery truss structure (7), and the lower part of the traveling crane (8) is connected to an electromagnetic unhooking device (6), the electromagnetic unhooking device (6) is connected to the vertical restraint device (5) through a rope, the vertical restraint device (5) is connected to a speed monitoring device (14), a through hole is opened on the speed monitoring device (14), a speed monitoring mark (11) is fixed on the launching truss structure (7), when the vertical restraint device (5) moves to a set position, the speed monitoring mark (11) is completely displayed in the through hole of the speed monitoring device (14); and also includes a camera system (12) for taking a photo of the speed mark (11).

2. A water-surface aircraft cabin entry test device as claimed in claim 1, characterized in that: The top surface of the roll adjustment device (4) is fixed with a mounting angle adjustment plate, on which two rows of small circular holes are provided, the centers of the two rows of small circular holes are respectively located on two circular arcs with overlapping centers and different radii, and the two rows of small circular holes are arranged in a staggered manner.

3. A water-surface aircraft cabin entry test device as claimed in claim 2, characterized in that: An angle fixing plate is fixed on the top surface of the vertical restraining device (5), and the angle fixing plate is arranged at a corresponding position of the angle adjustment plate. Two small circular holes are opened on the angle fixing plate, and the line connecting the centers of the two small circular holes on the angle fixing plate is along the vertical direction.

4. A water-surface aircraft cabin entry test device as claimed in claim 3, characterized in that: The axis of the angle adjustment plate, the axis of the angle fixing plate, and the line connecting the centers of the two small circular holes on the angle fixing plate are all located within the longitudinal symmetry plane of the cabin section model (1).

5. The water-entry test device for a surface aircraft cabin section according to claim 1, characterized in that: The vertical restraint device (5) is in the shape of a rectangular frame. The four corners of the vertical restraint device (5) are connected to sliders (9). The sliders (9) are slidably arranged on vertical slide rails (10) on the delivery truss structure (7).

6. A water-surface aircraft cabin entry test device as claimed in claim 5, characterized in that: The long side of the vertical restraint device (5) is along the transverse direction of the cabin model 1, and the short side of the vertical restraint device (5) is along the longitudinal direction of the cabin model 1.

7. The water-entry test device for a surface aircraft cabin section according to claim 1, characterized in that: The roll regulating device (4) is in the shape of a rectangular frame, the long side of the roll regulating device (4) is along the transverse direction of the cabin model (1), and the short side of the roll regulating device (4) is along the longitudinal direction of the cabin model (1).

8. The water-entry test device for a surface aircraft cabin section according to claim 1, characterized in that: The through hole of the speed monitoring device (14) is a circular hole, and the speed mark (11) is a circle with a diameter the same as the diameter of the through hole of the speed monitoring device (14). When the bottom end of the cabin model 1 just touches the water surface, the speed mark (11) coincides with the center of the circular hole of the speed monitoring device (14).

9. The water-entry test device for a surface aircraft cabin section according to claim 5, characterized in that: The two ends of the auxiliary longitudinal beam are connected to the two long sides of the vertical restraint device (5), and the auxiliary longitudinal beam is connected to the top surface of the vertical restraint device (5).

10. A test method using a water-surface aircraft cabin entry test device as claimed in any one of claims 1 to 9, characterized in that: The steps include: Step 1: Adjust the pitch adjustment device (3) and the roll adjustment device (4) to adjust the cabin model (1) to the angle required by the working condition, and lift the test device by means of the crane (8) until the slide block (9) fixed on the vertical restraint device (5) is docked with the slide rail (10) fixed on the delivery truss structure (7); Step 2: Lift the test device to a specified height by means of a crane (8), arrange a speed monitoring mark (11) at a preset position, align the camera system (12) with the speed mark (11), and start the high-speed camera system (12) and the data acquisition system (13); Step 3: When the water surface is calm, the electromagnetic release device (6) can be opened to implement the water entry test of the surface aircraft cabin; the test data is obtained through the data acquisition system (13), and the speed of the cabin model (1) at the moment of entering the water is calculated by observing the speed monitoring mark (11) and the speed monitoring device (14) in the camera system (12); The method for monitoring the instantaneous speed of the test model when entering the water is as follows. During the test, observation is performed through the camera system (12). Assuming that there are n photos from the top of the speed mark (11) at the bottom of the circular hole of the speed monitoring device (14) to the time when the center of the speed mark (11) coincides with the center of the circular hole of the speed monitoring device (14), the frame rate of the camera system (12) is Nfps, and the diameter of the speed mark (11) is L meters, then the instantaneous speed v of entering the water can be calculated according to the following formula:

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