Underwater model resistance measuring device for towing tank

Abstract

The invention discloses an underwater model resistance measuring device for a towing tank. The underwater model resistance measuring device comprises a central measuring bridge, a measuring bridge connecting seat is arranged above the central measuring bridge, a frame is arranged below the measuring bridge connecting seat, two rocker arms are arranged between the frame and the measuring bridge connecting seat, rapiers are arranged at the two ends of the frame, the frame is hinged to a sensor, and the sensor is arranged below the measuring bridge connecting seat; according to the underwater model resistance measuring device, the measuring bridge connecting seat, the rocker arm, the rotating joint bearing and the frame are adopted to form a parallelogram dragging mechanism, so that the frame is always horizontal; the two rapiers are matched to fix the underwater model, so that the underwater model only has one longitudinal freedom of motion, and the attitude stability of the underwater model during navigation is ensured; and the sensor is fixed on the measuring bridge connecting seat through the sensor lifting seat and the sliding table, and the sensor is directly and horizontally connected with the frame through the connecting rod, so that the sensor only bears tensile force in the experiment process, and the safety and the use precision of the sensor are ensured.

Description

Technical Field

[0001] The invention relates to measurement technology, in particular to a device for measuring resistance of an underwater model in a towing pool. Background Art

[0002] The existing underwater model resistance is usually connected to the model by a rapier, one end of the rapier is connected to the model, and the other end is connected to the sensor, which is fixed on the central measuring bridge. The resistance of the model under water is calculated according to the translation of the central measuring bridge. It has the following disadvantages:

[0003] First, the single rapier is connected to the model, and the model is unstable when being towed. Especially when the model is large, the single rapier is not stiff enough, which causes the model to be unstable during navigation, resulting in inaccurate measured values ​​and large errors.

[0004] Second, since the distance between the sensor and the center of the model is far, the resistance generated by the model in the water is very large when converted into the torque that the sensor bears. If a small-range sensor is used, the sensor is easily damaged by the torque generated by the sword rod. Although a large-range sensor is used for measurement, the sensor will not be damaged, but the measured resistance error will be large. Summary of the invention

[0005] In order to solve the defects of the above-mentioned prior art, the present invention provides a device for measuring the resistance of an underwater model in a towing tank, which solves the problem of unstable operation of the model, and the sensor only needs to withstand tension, thus solving the problems of easy damage to the sensor and measurement accuracy.

[0006] To achieve the above technical objectives, the present invention adopts the following technical solutions: a device for measuring the resistance of an underwater model in a towing tank, comprising a central measuring bridge, a measuring bridge connecting seat is provided above the central measuring bridge, a frame is provided below the measuring bridge connecting seat, two rocker arms are provided between the frame and the measuring bridge connecting seat, the two rocker arms are respectively located at the two ends of the measuring bridge connecting seat, the top and bottom of the rocker arms are provided with rotating joint bearings and are connected to the measuring bridge connecting seat and the frame through the rotating joint bearings, both ends of the frame are provided with rapiers, the two rapiers are respectively arranged at the two ends of the top of the underwater model, a pull rod is hinged on one side of the frame, the pull rod is hinged to a sensor, and the sensor is arranged below the measuring bridge connecting seat.

[0007] Preferably, first guide rails are provided on both sides of the top of the central measuring bridge, and first sliding blocks slidably matched with the first guide rails are provided on both sides of the bottom of the measuring bridge connecting seat.

[0008] Preferably, the rapier passes through two rapier fixing plates, which are respectively arranged on the top and bottom of the frame, and second guide rails are provided on both sides of the top and bottom of the frame. The second guide rails are slidably matched with second sliders, and the second sliders are fixed on both sides of the rapier fixing plates.

[0009] Preferably, the rapier fixing plate is provided with a clamp, and the clamp is used to fix the rapier to the rapier fixing plate.

[0010] Preferably, a plurality of locking bolts are threadedly engaged on both sides of the rapier fixing plate, and the locking bolts pass through the rapier fixing plate and the bottom ends thereof abut against the second guide rail.

[0011] Preferably, the sensor is fixed to the bottom of a sensor lifting seat, the sensor lifting seat is fixed below a sliding platform, and the sliding platform is arranged above a central side frame and fixed to a measuring bridge connecting seat.

[0012] Preferably, a pneumatic clamp is provided in the middle of the measuring bridge connecting seat, and a rotating cylinder is provided in the middle of the frame, and the pneumatic clamp is used to clamp or loosen the rotating cylinder.

[0013] In summary, the present invention has achieved the following technical effects:

[0014] 1. The device for measuring the resistance of an underwater model in a towing tank of the present invention adopts a measuring bridge connecting seat, a rocker arm, a rotating joint bearing and a frame to form a parallelogram towing mechanism, so that the frame is always horizontal; and cooperates with two rapiers to fix the underwater model, so that the underwater model has only one longitudinal degree of freedom of movement, ensuring the posture stability of the underwater model during navigation.

[0015] 2. In the towing tank underwater model resistance measuring device of the present invention, the sensor is fixed to the measuring bridge connecting seat through the sensor lifting seat and the sliding table, and the sensor is directly horizontally connected to the frame through a connecting rod, ensuring that the sensor only bears tension during the experiment, thereby ensuring the safety and accuracy of the sensor.

[0016] 3. The device for measuring the resistance of an underwater model in a towing tank of the present invention can, when the underwater model begins to be tested, clamp the rotating cylinder with the pneumatic gripper to stabilize the parallelogram towing mechanism, thereby ensuring that the sensor is not subjected to force during the acceleration of the underwater model, and preventing the model from being damaged due to the force being much greater than its measuring range during the acceleration process. When the model speed is stable, the pneumatic gripper is released to allow the sensor to be subjected to force to measure the underwater resistance of the underwater model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a device for measuring resistance of an underwater model in a towing tank according to the present invention;

[0018] Figure 2 It is a schematic diagram of the connection structure between the frame of the underwater model resistance measurement device for a towing tank and the underwater model of the present invention;

[0019] Explanation of the reference numerals in the specification: 1 - central measuring bridge, 2 - measuring bridge connecting seat, 3 - rocker arm, 4 - frame, 5 - rotary joint bearing, 6 - rapier fixing plate, 8 - pneumatic clamp, 9 - rotating cylinder, 10 - rapier, 12 - underwater model, 13 - sensor lifting seat, 14 - sensor, 15 - pull rod. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0021] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] Embodiment 1:

[0027] like Figure 1 As shown in Figure 2, a resistance measuring device for an underwater model 12 in a towing tank comprises a central measuring bridge 1, a measuring bridge connecting seat 2 is provided above the central measuring bridge 1, a frame 4 is provided below the measuring bridge connecting seat 2, two rocker arms 3 are provided between the frame 4 and the measuring bridge connecting seat 2, and the two rocker arms 3 are respectively located at both ends of the measuring bridge connecting seat 2, a rotating joint bearing 5 is provided at the top and bottom of the rocker arm 3 and the rocker arm 3 is connected to the measuring bridge connecting seat 2 and the frame 4 through the rotating joint bearing 5, a rapier 10 is provided at both ends of the frame 4, and the two rapiers 10 are respectively arranged at the two ends of the top of the underwater model 12, a pull rod 15 is hinged on one side of the frame 4, and the pull rod 15 is hinged to a sensor 14, and the sensor 14 is arranged below the measuring bridge connecting seat 2; the sensor 14 is fixed to the bottom of the sensor 14 lifting seat 13, and the sensor 14 lifting seat 13 is fixed below the sliding table, and the sliding table is arranged above the central side frame and fixed to the measuring bridge connecting seat 2; wherein the frame 4 is an aluminum alloy frame.

[0028] The towing tank resistance measurement device using the underwater model 12 of the present embodiment adopts a measuring bridge connecting seat 2, a rocker arm 3, a rotating joint bearing 5 and a frame 4 to form a parallelogram towing mechanism, so that the frame 4 is always horizontal; and the two sword rods 10 are used to fix the underwater model 12, so that the underwater model 12 has only one longitudinal degree of freedom of movement, ensuring the posture stability of the underwater model 12 during navigation; and the sensor 14 is fixed to the measuring bridge connecting seat 2 through the sensor 14 lifting seat 13 and the sliding table, and the sensor 14 is directly connected to the frame 4 horizontally through a connecting rod, ensuring that the sensor 14 only bears tension during the experiment, ensuring the safety and use accuracy of the sensor 14.

[0029] Both sides of the top of the central measuring bridge 1 are provided with first guide rails, and both sides of the bottom of the measuring bridge connecting seat 2 are provided with first sliding blocks that slidably cooperate with the first guide rails.

[0030] The rapier 10 passes through two rapier fixing plates 6, and the two rapier fixing plates 6 are respectively arranged on the top and bottom of the frame 4. Second guide rails are provided on both sides of the top and bottom of the frame 4. The second guide rails are slidably matched with second sliders, and the second sliders are fixed on both sides of the rapier fixing plates 6; the rapier fixing plates 6 are provided with clamps, and the clamps are used to fix the rapier 10 to the rapier fixing plates 6; both sides of the rapier fixing plates 6 are threadedly matched with a plurality of locking bolts, and the locking bolts pass through the rapier fixing plates 6 and the bottom ends abut against the second guide rails.

[0031] The two rapier fixing plates 6 can control the tilt angle of the rapier 10 to adapt to the shape of the top of the underwater model 12; and the two rapiers 10 can cooperate to make the rapier 10 at the head of the underwater model 12 vertical, and the bottom end of the rapier 10 at the tail tilted toward the head to provide a better support effect.

[0032] A pneumatic clamp 8 is provided in the middle of the measuring bridge connecting seat 2, and a rotating cylinder 9 is provided in the middle of the frame 4. The pneumatic clamp 8 is used to clamp or loosen the rotating cylinder 9; when the underwater model 12 starts to experiment, the pneumatic clamp 8 can clamp the rotating cylinder to stabilize the parallelogram dragging mechanism to ensure that the sensor 14 is not subjected to force during the acceleration of the underwater model 12, to avoid the model being damaged due to the force being much greater than its measuring range during the acceleration process. When the model speed is stable, the pneumatic clamp 8 is released to allow the sensor 14 to be subjected to force to measure the underwater resistance of the underwater model 12.

[0033] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A device for measuring resistance of an underwater model in a towing tank, characterized in that: It includes a central measuring bridge, a measuring bridge connecting seat is provided above the central measuring bridge, a frame is provided below the measuring bridge connecting seat, two rocker arms are provided between the frame and the measuring bridge connecting seat, the two rocker arms are respectively located at two ends of the measuring bridge connecting seat, rotating joint bearings are provided at the top and bottom of the rocker arms and are connected to the measuring bridge connecting seat and the frame through the rotating joint bearings, rapiers are provided at both ends of the frame, and the two rapiers are respectively arranged at two ends of the top of the underwater model, a pull rod is hinged on one side of the frame, the pull rod is hinged to the sensor, and the sensor is arranged below the measuring bridge connecting seat.

2. The underwater model resistance measurement device for a towing tank according to claim 1, characterized in that: Both sides of the top of the central measuring bridge are provided with first guide rails, and both sides of the bottom of the measuring bridge connecting seat are provided with first sliding blocks that slidably cooperate with the first guide rails.

3. The underwater model resistance measurement device for a towing tank according to claim 1, characterized in that: The rapier passes through two rapier fixing plates, which are respectively arranged on the top and bottom of the frame. Second guide rails are provided on both sides of the top and bottom of the frame. The second guide rails are slidably matched with second sliders, and the second sliders are fixed on both sides of the rapier fixing plates.

4. The underwater model resistance measurement device for a towing tank according to claim 3, characterized in that: The rapier fixing plate is provided with a clamp, and the clamp is used to fix the rapier to the rapier fixing plate.

5. The underwater model resistance measurement device for a towing tank according to claim 3, characterized in that: A plurality of locking bolts are threadedly matched on both sides of the rapier fixing plate. The locking bolts pass through the rapier fixing plate and the bottom ends thereof abut against the second guide rail.

6. The device for measuring resistance of an underwater model in a towing tank according to claim 1, characterized in that: The sensor is fixed to the bottom of the sensor lifting seat, the sensor lifting seat is fixed below the sliding platform, and the sliding platform is arranged above the central side frame and fixed to the measuring bridge connecting seat.

7. The device for measuring resistance of an underwater model in a towing tank according to claim 1, characterized in that: A pneumatic clamp is provided in the middle of the measuring bridge connection seat, and a rotating cylinder is provided in the middle of the frame. The pneumatic clamp is used to clamp or loosen the rotating cylinder.

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