A test device for frequency swing beat different curvature air-water interface

Abstract

The present application relates to a kind of test devices of variable frequency swing beat different curvature gas-water interface, including swing mechanism, for driving the swing of vehicle model;Cavitation curve generating mechanism, including the up and down front and rear movement of cavitator;Walking mechanism, for driving the swing mechanism and cavitation curve generating mechanism move;Wherein, cavitator is moved under the driving of walking mechanism, and then form a curvature gas-water interface, swing mechanism is provided with force balance on, swing mechanism is driven vehicle model swing by force balance, and force and moment in the process of vehicle model beating are measured by force balance.The present application moves cavitator by walking mechanism, so that the gas-water interface of certain curvature is generated, and vehicle model is driven swing by swing mechanism, the process that supercavitation vehicle model tail beats air bubble and water interface can be simulated equivalently, and tail beating force and hydrodynamic moment in the process of beating can be accurately obtained.

Description

Technical Field

[0001] This invention relates to the field of experimental technology, and in particular to an experimental device for oscillating and striking air-water interfaces with different curvatures using frequency conversion. Background Technology

[0002] For a supercavitating underwater vehicle moving at high speed, during its maneuvering motion, the tail of the vehicle strikes the interface between the cavitation and water with different curvatures at different frequencies, making the vehicle appear to be in a wobbling forward motion. During the tail-striking process, the interaction between the gas and water medium with complex geometric interfaces between the tail surface and the cavitation results in particularly complex flow in the interaction area between the surface and the cavitation during the tail-striking process.

[0003] Studying the complex flow process of a vehicle's tail strike and understanding its hydrodynamic characteristics are urgent needs for the development of supercavitating weapons and equipment. However, there are no domestic experimental studies on supercavitating vehicles striking air-water interfaces with different curvatures at different frequencies, making it impossible to accurately obtain the tail strike force and hydrodynamic torque during the striking process.

[0004] Therefore, we propose an experimental device for oscillating and striking air-water interfaces with different curvatures using a variable frequency method. Summary of the Invention

[0005] In response to the shortcomings of the existing production technology, the applicant provides a test device for oscillating and striking air-water interfaces with different curvatures using a variable frequency method. This device can effectively simulate the process of the tail of a supercavitating aircraft striking the interface between the cavitation bubble and the water, and can accurately obtain the tail striking force and hydrodynamic torque during the striking process.

[0006] The technical solution adopted in this invention is as follows:

[0007] A test apparatus for variable frequency oscillating and striking air-water interfaces with different curvatures includes:

[0008] The swing mechanism is used to drive the model of the ship to swing.

[0009] A cavitation surface generation mechanism, including a cavitation generator capable of moving up, down, back, and forth;

[0010] The traveling mechanism is used to drive the oscillating mechanism and the cavitation surface generation mechanism to move;

[0011] The cavitation device moves under the drive of the walking mechanism, thereby forming a curved air-water interface. A force balance is installed on the swing mechanism. The swing mechanism drives the model of the ship to swing through the force balance. The force balance measures the force and torque of the model of the ship during the impact process.

[0012] Its further features are:

[0013] The traveling mechanism includes a trailer and two parallel tracks spaced apart. The trailer is mounted on the tracks and is driven to move on the tracks by a linear motor.

[0014] The trailer is equipped with a guide rail, on which a sliding slider is mounted. The slider has a groove that cooperates with the guide rail. The slider can be fixed by bolts and also has a guide groove.

[0015] The swing mechanism includes a motor mounted on a trailer. A connecting shaft is mounted on the motor's output shaft. One end of the connecting shaft is connected to a swing wheel, and the other side of the swing wheel is equipped with an eccentric shaft. The eccentric shaft is movably mounted in the keyway of a crank. A trunnion hole is also provided at the bottom of the crank. A force balance is detachably connected to the bottom of the crank, and the model of the navigable vehicle is detachably connected to the force balance. A trunnion is movably connected in the trunnion hole, and support members are fixed at both ends of the trunnion. One end of the support member is fixed to the bottom of the trailer.

[0016] The crank is connected to a force balance via a flange at its bottom, and the model of the ship is connected to the outside of the force balance via a flange.

[0017] The cavitation device is detachably connected to the bottom of the connecting plate. The top of the connecting plate is connected to a guide block via a connecting rod. The guide block is movably positioned in the guide groove of the slider. The guide block can slide up and down in the guide groove and can be fixed by bolts.

[0018] The front of the connecting plate is provided with an integrally formed upwardly inclined pressure plate to prevent water splashes from the top of the connecting plate.

[0019] The model of the aircraft is equipped with an angular velocity sensor and an acceleration sensor.

[0020] The trailer is also equipped with a measurement system, and the data measured by the angular velocity sensor, acceleration sensor and force balance are stored in the measurement system.

[0021] The beneficial effects of this invention are as follows:

[0022] This invention has a compact and reasonable structure and is easy to operate. The cavitation device is moved by the walking mechanism, which generates a gas-water interface with a certain curvature. The swing mechanism drives the model of the supercavitating vehicle to swing, which can equivalently simulate the process of the tail of the supercavitating vehicle hitting the cavitation and water interface. It can also accurately obtain the tail hitting force and hydrodynamic torque during the hitting process.

[0023] In addition, the present invention also has the following advantages:

[0024] (1) This test apparatus allows for a very wide range of frequency adjustment for the swinging of the aircraft model, ranging from 0 to 30 Hz, which can cover all relevant impact tests. The motor-driven swing wheel, which in turn drives the crank to move around the trunnion, avoids mechanical dead spots during high-frequency swinging of the aircraft model. The cavitation surface generation device can be adjusted up and down, forward and backward, and with a certain trailer speed, can generate air-water interfaces with different curvatures. The swing angle of the aircraft model can also be adjusted via the eccentricity of the swing wheel. This test apparatus has multi-parameter adjustment capabilities, which can well match various requirements of related tests.

[0025] (2) The interface between the aircraft model and the test device is the inner end face flange of the force balance. For different aircraft models, only a flange that connects with the inner end face flange of the force balance needs to be arranged inside. Other components in the test device do not need to be changed, which greatly simplifies the test model installation process and improves the test efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention.

[0027] Figure 2 The model of the aircraft body of the present invention swings and strikes the air-water interface.

[0028] Figure 3 This is a schematic diagram of the swing wheel structure of the present invention.

[0029] Figure 4 This is a schematic diagram of the crank structure of the present invention.

[0030] Figure 5 This is a schematic diagram of the force balance structure of the present invention.

[0031] Figure 6 This is a schematic diagram of the cavitation surface generation mechanism of the present invention.

[0032] Figure 7 This is a schematic diagram of the cavitation device of the present invention.

[0033] Figure 8 This is a schematic diagram of the slider structure of the present invention.

[0034] Figure 9 This is a schematic diagram of the trunnion structure of the present invention.

[0035] The components include: 1. Walking mechanism; 101. Track; 102. Trailer; 103. Slider; 1031. Guide groove; 1032. Groove; 104. Guide track; 2. Swinging mechanism; 201. Motor; 202. Swing wheel; 203. Connecting shaft; 204. Eccentric shaft; 205. Crank; 2051. Keyway; 2052. Trunnion hole; 206. Trunnion; 207. Support component; 208. Force balance; 3. Cavitation surface generation mechanism; 301. Cavitation device; 302. Connecting plate; 3021. Pressure plate; 303. Connecting rod; 304. Guide block; 4. Measurement system; 5. Aircraft model. Detailed Implementation

[0036] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0037] like Figures 1-9 As shown, a test device for impacting air-water interfaces with different curvatures by frequency-controlled oscillation includes a walking mechanism 1, an oscillation mechanism 2, a cavitation surface generation mechanism 3, a measurement system 4, and a vehicle model 5. The walking mechanism 1 drives the test device to move. The oscillation mechanism 2, the cavitation surface generation mechanism 3, and the measurement system 4 are mounted on the walking mechanism 1, and the vehicle model 5 is mounted on the oscillation mechanism 2. The cavitation surface generation mechanism 3 generates an air-water interface with a certain curvature value. The oscillation mechanism 2 drives the vehicle model 5 to oscillate, and the tail of the vehicle model 5 periodically impacts the generated air-water interface to achieve the test objective.

[0038] like Figures 1-2 As shown, the traveling mechanism 1 includes a track 101 and a trailer 102. There are two tracks 101, which are arranged parallel to each other at intervals. The trailer 102 passes through the two tracks 101. The trailer 102 is driven to move on the track 101 by a linear motor. The linear motor can drive the trailer 102 to perform accelerated movement, reduced movement and uniform movement.

[0039] The trailer 102 is provided with a guide rail 104, and a slider 103 is movably mounted on the guide rail 104. The slider 103 has a groove 1032, which allows it to slide along the guide rail 104 and can be fixed by bolts. The slider 103 is also provided with a guide groove 1031.

[0040] like Figures 3-5 , Figures 8-9As shown, the swing mechanism 2 includes a motor 201, which is mounted on the trailer 102. A connecting shaft 203 is mounted on the output shaft of the motor 201. One end of the connecting shaft 203 is connected to a swing wheel 202, and the other side of the swing wheel 202 is provided with an eccentric shaft 204. The eccentric shaft 204 is movably mounted within the keyway 2051 of the crank 205. A trunnion hole 2052 is also provided at the bottom of the crank 205. A force balance 208 is connected to the bottom of the crank 205 via a flange. The model 5 is connected to the force balance 208 via a flange. A trunnion 206 is movably connected within the trunnion hole 2052. Support members 207 are fixed at both ends of the trunnion 206, with one end of the support member 207 fixed to the bottom of the trailer 102. The output shaft of the motor 201 is coaxial with the connecting shaft 203.

[0041] When motor 201 is working, its output shaft drives connecting shaft 203 to rotate. Connecting shaft 203 drives oscillating wheel 202 to rotate. Oscillating wheel 202 drives eccentric shaft 204 to rotate within keyway 2051 of crank 205, which in turn drives crank 205 to rotate along trunnion 206. Crank 205 drives the model 5 to oscillate via force balance 208. The oscillation frequency of model 5 is adjusted by regulating the power of motor 201.

[0042] like Figures 6-7 As shown, the cavitation surface generating mechanism 3 includes a cavitation unit 301, which is detachably connected to the bottom of a connecting plate 302. An integrally formed, upwardly inclined pressure plate 3021 is provided at the front of the connecting plate 302. A guide block 304 is connected to the top of the connecting plate 302 via a connecting rod 303. The guide block 304 is movably disposed within the guide groove 1031 of the slider 103, allowing it to slide up and down within the guide groove 1031 and be fixed by bolts. The pressure plate 3021 suppresses water droplets, preventing them from escaping from above the connecting plate 302 and disrupting the air-water interface.

[0043] The cavitation device 301 is moved by the walking mechanism 1, thereby creating an air-water interface with a certain curvature. The height of the cavitation device 301 can be adjusted by the up-and-down movement of the guide block 304, and the position of the cavitation device 301 can be adjusted by the forward-and-backward movement of the slider 103. In addition, the air-water interface with different curvatures can be adjusted by adjusting the walking speed of the walking mechanism 1, which can be used to test different situations.

[0044] The model 5 is also equipped with an acceleration sensor and an angular velocity sensor to measure the acceleration and angular velocity of the model 5 impacting the air-water interface. The force and torque of the model 5 during the impact process are measured by a force balance 208. The measured acceleration, angular velocity, force and torque are then transmitted to the measurement system 4 for storage.

[0045] In practical use, the trailer 102 moves on the track 101 via a linear motor, which in turn drives the swing mechanism 2 and the cavitation surface generating mechanism 3 to move. The pressure plate 3021 of the cavitation surface generating mechanism 3 suppresses the water splash. The cavitation cavitation device 301 generates an air-water interface with a certain curvature under the drive of the trailer 102. The motor 201 drives the swing wheel 202 to rotate via the connecting shaft 203. The swing wheel 202 drives the crank 205 to rotate along the trunnion 206 via the eccentric shaft 204. The crank 205 drives the model 5 to swing periodically via the force balance 208. The force balance 208 measures the force and torque during the impact process. The angular velocity sensor and acceleration sensor on the model 5 measure the acceleration and swing angular velocity of the model 5 impacting the air-water interface. Finally, the measured force, torque, acceleration, and angular velocity are transmitted to the measurement system 4 for storage. This allows for the accurate acquisition of the force and torque during the impact process of the model 5.

[0046] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A test apparatus for oscillating and striking air-water interfaces with different curvatures using variable frequency methods, characterized in that, include: The swing mechanism (2) is used to drive the model of the navigating body (5) to swing. The cavitation surface generation mechanism (3) includes a cavitation device (301) that can move up and down and back and forth; The walking mechanism (1) is used to drive the swing mechanism (2) and the cavitation surface generation mechanism (3) to move; The cavitation device (301) moves under the drive of the walking mechanism (1) to form a curved air-water interface. A force balance (208) is set on the swing mechanism (2). The swing mechanism (2) drives the navigating model (5) to swing through the force balance (208). The force balance (208) measures the force and torque of the navigating model (5) during the striking process.

2. The experimental apparatus for testing air-water interfaces with different curvatures by frequency-controlled oscillation as described in claim 1, characterized in that: The walking mechanism (1) includes a trailer (102) and two parallel tracks (101) spaced apart. The trailer (102) is mounted on the tracks (101) and is driven to move on the tracks (101) by a linear motor.

3. The experimental device for variable frequency swinging and striking air-water interfaces with different curvatures as described in claim 2, characterized in that: The trailer (102) is provided with a guide rail (104), and a sliding slider (103) is provided on the guide rail (104). The slider (103) is provided with a groove (1032) that cooperates with the guide rail (104). The slider (103) can be fixed by bolts. The slider (103) is also provided with a guide groove (1031).

4. The experimental apparatus for testing air-water interfaces with different curvatures by frequency-controlled oscillation and impact as described in claim 2, characterized in that: The swing mechanism (2) includes a motor (201), which is mounted on the trailer (102). A connecting shaft (203) is mounted on the output shaft of the motor (201). One end of the connecting shaft (203) is connected to a swing wheel (202). An eccentric shaft (204) is mounted on the other side of the swing wheel (202). The eccentric shaft (204) is movably mounted in the keyway (2051) of the crank (205). A trunnion hole (2052) is also provided at the bottom of the crank (205). A force balance (208) is detachably connected to the bottom of the crank (205). The model of the aircraft (5) is detachably connected to the force balance (208). A trunnion (206) is movably connected in the trunnion hole (2052). Support members (207) are fixed at both ends of the trunnion (206). One end of the support member (207) is fixed to the bottom of the trailer (102).

5. The experimental apparatus for testing air-water interfaces with different curvatures by variable frequency oscillation and impact as described in claim 4, characterized in that: The crank (205) is connected to a force balance (208) at its bottom via a flange, and the model of the ship (5) is connected to the force balance (208) via a flange.

6. The experimental apparatus for testing air-water interfaces with different curvatures by frequency-controlled oscillation as described in claim 3, characterized in that: The cavitation device (301) is detachably connected to the bottom of the connecting plate (302). The top of the connecting plate (302) is connected to a guide block (304) via a connecting rod (303). The guide block (304) is movably disposed in the guide groove (1031) of the slider (103). The guide block (304) can slide up and down in the guide groove (1031) and can be fixed by bolts.

7. The experimental apparatus for testing air-water interfaces with different curvatures by frequency-controlled oscillation and impact as described in claim 6, characterized in that: The front of the connecting plate (302) is provided with an integrally formed upwardly inclined pressure plate (3021) to prevent water splashes from the top of the connecting plate (302).

8. The experimental apparatus for testing air-water interfaces with different curvatures by frequency-controlled oscillation as described in claim 2, characterized in that: The model of the aircraft (5) is equipped with an angular velocity sensor and an acceleration sensor.

9. The experimental apparatus for testing air-water interfaces with different curvatures by frequency-controlled oscillation as described in claim 8, characterized in that: The trailer (102) is also equipped with a measurement system (4), and the data measured by the angular velocity sensor, acceleration sensor and force balance (208) are stored in the measurement system (4).

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