A multi-degree-of-freedom air cushion vehicle skirt experimental device

Abstract

The application discloses a kind of multi-degree-of-freedom air cushion vehicle skirt experimental device, including front air chamber, rear air chamber and skirt movable assembly, the bottom of the front air chamber is provided with adjusting door, the rear end of the front air chamber is connected with the rear air chamber, the downside of the rear air chamber is used to communicate with the air inlet hole of skirt, the skirt movable assembly includes connecting seat, screw rod, support plate and position adjusting rod, the screw rod is vertically and rotatably installed in the rear air chamber, the connecting seat is threadedly connected with the screw rod in lifting position adjusting mode, the support plate is installed on the connecting seat, the lower end of the support plate is used to rotatably connect skirt, the position adjusting rod is movably installed on the connecting seat, and the position adjusting rod is used to connect skirt and rotate around the connecting place of skirt and support plate by moving along the connecting seat, the bottom side of the rear air chamber is provided with isolator.The application is convenient to adjust skirt in experiment, to meet the requirement of experimental working condition.

Description

Technical Field

[0001] This invention relates to the field of hovercraft experimental device technology, and in particular to a multi-degree-of-freedom hovercraft apron experimental device. Background Technology

[0002] Hovercraft, due to their high speed and agility, have wide applications in special-purpose applications. The flexible apron, a key component of hovercraft, not only enhances obstacle-crossing and amphibious capabilities but also reduces drag, improves maneuverability, and seakeeping. However, the dynamic characteristics of its flexible materials and special structural design make the apron prone to flutter, easily causing damage. This problem has become one of the technical bottlenecks restricting the development of hovercraft towards larger sizes and further performance improvements. Current hovercraft apron testing is often conducted on land, but real-ship tests have shown that hovercraft stably raised on land may experience apron flutter when statically raised on water. This indicates that the flutter of the flexible apron on the water surface is not only a matter of the apron's own dynamic response but also related to the complex interactions between the air cushion, the hull, and water waves. Therefore, it is necessary to develop corresponding structural operation testing devices for apron testing, and these devices should be easily controllable for testing at multiple positions and angles. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-degree-of-freedom hovercraft apron experimental device that can conveniently control the apron's position and achieve flexible adjustments during the experiment.

[0004] An experimental device for a multi-degree-of-freedom hovercraft apron includes a front air chamber, a rear air chamber, and an apron movable assembly. The bottom of the front air chamber has an adjustment door, and the rear end of the front air chamber is connected to and sealed with the rear air chamber. The lower side of the rear air chamber communicates with the air inlet of the apron. The apron movable assembly includes a connecting seat, a lead screw, a support plate, and an adjusting rod. The lead screw is vertically and rotatably installed in the rear air chamber. The connecting seat is threadedly connected to the lead screw and is adjustable in position. The support plate is installed on the connecting seat, and its lower end is used to rotatably connect to the apron. The adjusting rod is movably and adjustablely installed on the connecting seat, and is used to connect the apron and, by moving along the connecting seat, causes the apron to rotate around its connection with the support plate. An isolation piece is provided on the bottom side of the rear air chamber to seal the area around the apron's air inlet.

[0005] In a preferred embodiment of the present invention, there are several lead screws distributed at intervals and correspondingly connected to the connecting seats, and the lead screws are connected to each other by a timing belt.

[0006] As a preferred embodiment of the present invention, the upper end of the lead screw extends out of the rear air chamber in a sealed manner, and a bearing seat rotatably connected to the lead screw is provided on the upper side of the rear air chamber, and a handwheel is provided at the top end of one of the lead screws.

[0007] As a preferred embodiment of the present invention, there are two support plates, which are respectively placed on the left and right sides of the bottom of the connecting seat. The lower end of the support plate is used to hinge with the lower part of the apron. The adjusting rod is curved upward and the two ends of the adjusting rod are used to connect the front and rear sides of the upper part of the apron. The bottom of the connecting seat is provided with a drive wheel for driving the adjusting rod to move.

[0008] As a preferred embodiment of the present invention, the drive wheel is a turbine that is aligned with the front-to-back direction of the apron, and the front and rear ends of the drive wheel are respectively mounted on the lower side of the connecting seat via L-shaped corner fittings, and the adjusting rod is a worm gear that matches the drive wheel.

[0009] As a preferred embodiment of the present invention, the front end of the front air chamber is provided with a diffuser section that connects to the air intake pipe, and the diffuser section is conical.

[0010] As a preferred embodiment of the present invention, the front end of the front air chamber is connected to the air intake pipe through a rectifier pipe, and the rectifier pipe is provided with several thin-walled straight pipes that are evenly and densely distributed along the airflow direction.

[0011] As a preferred embodiment of the present invention, an isolation plate is provided at the lower front end of the front air chamber, and the upper part of the isolation plate is connected to an exhaust pipe.

[0012] As a preferred embodiment of the present invention, the separator is a partition, one end of which is connected to the bottom side of the rear air chamber, and the other end of which is used to slidably seal against the upper side of the apron.

[0013] Compared with the prior art, the multi-degree-of-freedom hovercraft apron experimental device of this invention has the following advantages: This experimental device can realize the raising and lowering adjustment and the rotation adjustment of the apron. During the experiment, it is only necessary to connect the apron with the support plate and the adjustment rod, and let the isolation part seal the connection around the side wall or the upper air inlet of the apron. Thus, after the air enters the front air chamber, most of the airflow enters the rear air chamber, and a small part of the airflow is output from the regulating door. The airflow in the rear air chamber naturally enters through the air inlet of the apron and is ejected from the air outlet at the end of the apron. Therefore, this experimental device can be placed on the experimental water pool to study the effect of the apron on the water surface when it sprays air, and can control the height of the apron from the water surface and the relative tilt angle of the water surface as needed. At the same time, the regulating door can regulate the airflow on the water surface in front of the apron. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the assembly structure according to an embodiment of the present invention;

[0015] Figure 2 This is a cross-sectional structural diagram of an application embodiment of the present invention;

[0016] Figure 3 This is a schematic diagram of the upper structure of the apron movable component in an embodiment of the present invention;

[0017] Figure 4 This is a side cross-sectional view of the apron movable component connected to the apron in an embodiment of the present invention;

[0018] Figure 5 This is a schematic diagram of the rectifier tube in an embodiment of the present invention. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0020] In the description of this invention, it should be understood that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In the description of this invention, it should also be understood that the terms "upper," "lower," "left," "right," "front," "rear," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the machine or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. It should be understood that the terms "first," "second," etc., are used in this invention to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this invention, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.

[0022] refer to Figure 1 and 2An experimental device for a multi-degree-of-freedom hovercraft apron according to an embodiment of the present invention includes a front air chamber 1, a rear air chamber 2, and an apron movable assembly. The front end of the front air chamber 1 is an air inlet, and an adjustment door 11 is provided at the bottom of the front air chamber 1. The rear end of the front air chamber 1 is connected to and sealed to the rear air chamber 2. The lower side of the rear air chamber 2 is used to communicate with the air inlet of the apron 4. The apron movable assembly is installed on the rear air chamber 2. The apron movable assembly includes a connecting seat 31, a lead screw 32, a support plate 33, and an adjustment rod 34. The lead screw 32 is vertically mounted and rotatably mounted. Inside the rear air chamber 2, the connecting seat 31 is threadedly connected to the lead screw 32 in a height-adjustable manner. The support plate 33 is mounted on the connecting seat 31, and the lower end of the support plate 33 is used to rotatably connect the apron 4. The adjusting rod 34 is movably mounted on the connecting seat 31, and the adjusting rod 34 is used to connect the apron 4 and rotates the apron 4 around its connection with the support plate 33 by moving along the connecting seat 31. The bottom side of the rear air chamber 2 is provided with an isolation piece 21 for sealing the air inlet of the apron 4. In this test device, the connecting seat 31 can... The apron 4 can be adjusted by rotating along the lead screw 32, or by rotating the lead screw 32 without rotating itself. The adjusting rod 34 can be a telescopic rod, a sliding rod, or other common mechanism. When the adjusting rod 34 moves on the connecting seat 31, it naturally drives the apron 4 to move accordingly. Since the support plate 33 is rotatably connected to the apron 4, the apron 4 will rotate around the rotatable connection point with the support plate 33, thus achieving the rotational adjustment of the apron 4. Therefore, during the experiment, only the apron 4 needs to be adjusted. With the support plate 33 and the adjusting rod 34, and with the isolator 21 sealingly connected to the side wall or the area around the upper air inlet of the apron 4, most of the airflow after the front air chamber 1 is inlet enters the rear air chamber 2, and a small portion of the airflow is output from the regulating door 11. The airflow in the rear air chamber 2 naturally enters through the air inlet of the apron 4 and is ejected from the air outlet at the end of the apron 4. Therefore, this experimental device can be placed on the experimental water pool to study the effect of the apron 4 on the water surface when it sprays air, and can control the height of the apron 4 from the water surface and the relative tilt angle of the water surface as needed. At the same time, the regulating door 11 can regulate the airflow on the water surface in front of the apron 4.

[0023] refer to Figure 2-4 For example, there are several lead screws 32 that are distributed at a distance and are connected to the connecting seats 31 respectively. The lead screws 32 are connected to each other by a synchronous belt 321. Therefore, when two or more lead screws 32 are vertically threaded to two or more spaced positions of the connecting seats 31 and the lead screws 32 rotate synchronously, the connecting seats 31 can only move up and down. The connecting seats 31 do not need other moving connections for lifting and limiting, and also support the connecting seats 31 well in the rear air chamber 2.

[0024] refer to Figure 1-4For example, the upper end of the lead screw 32 extends out of the rear air chamber 2 in a sealed manner, and a bearing seat 22 rotatably connected to the lead screw 32 is provided on the upper side of the rear air chamber 2. A handwheel 322 is provided at the top of one of the lead screws 32, so that the apron 4 can be raised and lowered directly above the rear air chamber 2 by means of the handwheel 322, which is very convenient and does not affect the airtightness of the rear air chamber 2.

[0025] refer to Figure 2 and 4 For example, there are two support plates 33, which are placed on the left and right sides of the bottom of the connecting seat 31. The lower end of the support plate 33 is used to hinge with the lower part of the apron 4. The adjusting rod 34 is curved upward. The two ends of the adjusting rod 34 are used to connect the front and rear sides of the upper part of the apron 4. The bottom of the connecting seat 31 is provided with a drive wheel 35 for driving the adjusting rod 34. The drive wheel 35 can be a gear, friction wheel, etc. The adjusting rod 34 can be driven by the drive wheel 35 through the corresponding top surface structure to achieve different tilt angles by cooperating with the drive wheel 35.

[0026] refer to Figure 4 For example, the drive wheel 35 is a turbine that is aligned with the front-to-back direction of the apron 4. The front and rear ends of the drive wheel 35 are respectively mounted on the lower side of the connecting seat 31 via L-shaped corner pieces 351. The adjusting rod 34 is a worm gear that matches the drive wheel 35. Although the end of the drive wheel 35 is rotatably connected to the L-shaped corner piece 351, due to the characteristics of the worm gear, the adjusting rod 24 can only be moved when the drive wheel 35 rotates. When the drive wheel 35 is stationary, the adjusting rod 34 can be self-locked. Therefore, the tilt angle of the apron 4 can be directly fixed without other parts or locking the drive wheel 35, making experimental control more convenient.

[0027] refer to Figure 1 and 2 For example, the front end of the front air chamber 1 is provided with a diffuser section 12 that connects to the air intake pipe. The diffuser section 12 is conical, allowing the airflow to enter the front air chamber 1 more evenly.

[0028] refer to Figure 1 , 2 For example, the front end of the front air chamber 1 is connected to the air intake pipe through the rectifier pipe 13. The rectifier pipe 13 is provided with several thin-walled straight pipes that are evenly and densely distributed along the airflow direction, so that the irregular and turbulent airflow becomes more uniform and regular after being straightened and broken up by the rectifier pipe 13. Therefore, it is preferable that the air intake pipe is connected to the diffuser section 12 through the rectifier pipe 13 to optimally control the airflow entering the front air chamber 1.

[0029] refer to Figure 2For example, the separator 21 is a partition, one end of which is connected to the bottom side of the rear air chamber 2, and the other end of which is used to slidably seal against the area around the air inlet on the upper side of the apron 4. Therefore, even if the apron 4 changes with the tilt angle, the rear air chamber 2 can still be well sealed and connected to the apron 4 through the separator 21.

[0030] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A multi-degree-of-freedom hovercraft apron experimental device, characterized in that: The device includes a front air chamber, a rear air chamber, and an apron movable assembly. The bottom of the front air chamber has an adjustment door, and the rear end of the front air chamber is connected to and sealed with the rear air chamber. The lower side of the rear air chamber communicates with the air inlet of the apron. The apron movable assembly includes a connecting seat, a lead screw, a support plate, and an adjusting rod. The lead screw is vertically and rotatably installed in the rear air chamber. The connecting seat is threadedly connected to the lead screw and is adjustable in position. The support plate is installed on the connecting seat, and its lower end is used to rotatably connect to the apron. The adjusting rod is movably and adjustablely installed on the connecting seat, and it connects to the apron and, by moving along the connecting seat, causes the apron to rotate around its connection with the support plate. The bottom side of the rear air chamber has an isolation piece for sealing the area around the apron's air inlet.

2. The multi-degree-of-freedom hovercraft apron experimental device according to claim 1, characterized in that: The lead screws are distributed at intervals and are connected to the connecting seats accordingly. The lead screws are connected to each other by a timing belt.

3. The multi-degree-of-freedom hovercraft apron experimental device according to claim 2, characterized in that: The upper end of the lead screw extends out of the rear air chamber in a sealed manner, and a bearing seat that is rotatably connected to the lead screw is provided on the upper side of the rear air chamber, and a handwheel is provided at the top of one of the lead screws.

4. The multi-degree-of-freedom hovercraft apron experimental device according to any one of claims 1-3, characterized in that: There are two support plates, which are placed on the left and right sides of the bottom of the connecting seat. The lower end of the support plate is used to hinge with the lower part of the apron. The adjusting rod is curved upward and the two ends of the adjusting rod are used to connect the front and rear sides of the upper part of the apron. The bottom of the connecting seat is provided with a drive wheel for driving the adjusting rod to move.

5. The multi-degree-of-freedom hovercraft apron experimental device according to claim 4, characterized in that: The drive wheel is a worm gear that runs in the same direction as the front and back of the apron. The front and rear ends of the drive wheel are respectively installed on the lower side of the connecting seat through L-shaped corner fittings. The adjusting rod is a worm gear that matches the drive wheel.

6. The multi-degree-of-freedom hovercraft apron experimental device according to any one of claims 1-3, characterized in that: The front end of the front air chamber is provided with a diffuser section that connects to the air intake pipe, and the diffuser section is conical.

7. The multi-degree-of-freedom hovercraft apron experimental device according to any one of claims 1-3, characterized in that: The front end of the front air chamber is connected to the air intake pipe through a rectifier pipe, and the rectifier pipe is provided with several thin-walled straight pipes that are evenly and densely distributed along the airflow direction.

8. The multi-degree-of-freedom hovercraft apron experimental device according to any one of claims 1-3, characterized in that: An isolation plate is provided at the lower front end of the front air chamber, and the upper part of the isolation plate is connected to the exhaust pipe.

9. The multi-degree-of-freedom hovercraft apron experimental device according to any one of claims 1-3, characterized in that: The separator is a partition, one end of which is connected to the bottom side of the rear air chamber, and the other end of which is used to slidably seal against the upper side of the apron.

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