Double-arm planar motion mechanism for wave pool force measurement

Abstract

A double-arm type planar motion mechanism for wave pool force measurement comprises a connecting bridge, positioning components are symmetrically arranged at the two ends of the connecting bridge, a balance component is hinged to the bottom of each positioning component, the middle of each positioning component extends to the outer side through a connecting rod, and a fixing base component is installed at the head of each connecting rod through a first bearing. Meanwhile, the balance component is also connected with the fixed seat components through a first bearing, one fixed seat component is connected with the bow part of the ship, and the other fixed seat component is connected with the stern part of the ship; a fixing bolt is mounted at the joint of the positioning component and the balancing component; through the connection mode, the motion freedom degree of the connecting claw mechanism connected with the double-arm type plane motion mechanism and the ship model can be conveniently and effectively adjusted, and the release and fixation of heaving and pitching motion of the ship model installed at the bottom of the double-arm type plane motion mechanism are controlled. And under the condition of not influencing the free motion of the test ship model of the planar motion mechanism in still water and waves, the hydrodynamic force borne by the ship model is measured.

Description

Technical Field

[0001] The present invention relates to the technical field of planar motion mechanisms, and in particular to a double-arm planar motion mechanism for wave tank force measurement. Background Art

[0002] Planar motion mechanisms are widely used in ship performance tests and are the infrastructure for conducting captive model tests of ship maneuverability in shipbuilding industry and shipbuilding scientific research. Planar motion mechanism devices usually adopt two connection forms with ship models, namely "single-arm type" and "double-arm type". Among them, the double-arm planar motion mechanism device consists of a sway mechanism - a yaw mechanism - two force sensors - two connecting devices - a ship model. The two force sensors are respectively installed on the upper parts of the front and rear two connecting devices, and are used to measure the forces on the front and rear two measuring points of the ship model and finally obtain the overall force on the hull.

[0003] Most of the existing double-arm planar motion mechanism devices in the prior art have proposed solutions and measurement and control methods for the conventional composition, mechanical structure, connection methods between various structures, and measurement and control programs of planar motion mechanisms, and have developed well-applicable planar motion mechanism designs according to different fields such as surface ships and underwater vehicles. However, considering the planar motion mechanism test of a surface ship model under wave conditions, how to solve the heave and pitch motions of the ship model in the planar motion mechanism test under wave conditions, as well as how to effectively handle the forces on the two arms and obtain a specific solution for the resultant force of the ship model that can be used for data analysis and other problems need to be solved urgently. Summary of the Invention

[0004] The applicant of the present invention aims at the above-mentioned disadvantages in the existing production technology and provides a double-arm planar motion mechanism for wave tank force measurement. Through this connection form, the degrees of freedom of movement of the "connection claw" mechanism connecting the double-arm planar motion mechanism and the ship model can be adjusted conveniently and effectively, and the release and fixation of the heave and pitch motions of the ship model installed at the bottom of the double-arm planar motion mechanism can be controlled, so as to measure the hydrodynamic force on the ship model under the condition of not affecting the free movement of the ship model in the planar motion mechanism test in still water and waves.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A double-arm planar motion mechanism for wave tank force measurement, including a connecting bridge. On the horizontal direction of the connecting bridge, scales are symmetrically arranged, and positioning members are symmetrically arranged at both ends of the connecting bridge. The bottom of a single positioning member is hinged with a balancing member. The middle part of the positioning member extends outward through a connecting rod, and a fixing seat member is installed and fixed at the head of the connecting rod through a first bearing. At the same time, the balancing member is also connected to the fixing seat member through a first bearing. One of the fixing seat members is connected to the bow of the ship, and the other fixing seat member is connected to the stern of the ship;

[0007] A fixed pin is installed at the connection position between the positioning member and the balancing member;

[0008] The structure of a single positioning member is as follows: it includes a positioning plate. The middle part of the positioning plate is connected to the connecting rod through a second bearing. At the top of the positioning plate, spaced sliders are installed through bolts. Pulleys are installed on the sliders, and the pulleys are connected to the connecting bridge;

[0009] The structure of a single balancing member is as follows: it includes a horizontal balancing plate connected to the positioning plate through a first bearing. One end of the balancing plate is connected to the fixed seat member, and a pressing block is installed at the other end of the balancing plate through a pressing rod;

[0010] The structure of the fixed seat member is as follows: it includes a mounting plate connected to both the connecting rod and the balancing plate through a first bearing. At the bottom of the mounting plate, a two-force balance is installed, and a fixed block is installed at the bottom of the two-force balance.

[0011] Its further technical solution lies in:

[0012] The fixed pin is detachable.

[0013] The connecting rod and the first bearing connect the positioning member, the balancing member, and the fixed seat member to form a quadrilateral structure.

[0014] A pointer is installed on the positioning plate between the two pulleys, and the pointer corresponds to a scale.

[0015] According to the actual position of the pointer, the longitudinal position of the center of gravity of the two-side mechanism is adjusted to be consistent with the rotation center of the connecting bridge.

[0016] The pressing block adopts a cuboid structure or a cube structure.

[0017] The two pressing blocks are arranged oppositely.

[0018] The balancing plate has a long strip structure.

[0019] The connecting rod is perpendicular to the mounting plate.

[0020] The balancing plate is perpendicular to the mounting plate.

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

[0022] The structure of the present invention is compact and reasonable, and the operation is convenient. Through this connection form, it is possible to conveniently and effectively adjust the degrees of freedom of movement of the "connecting claw" mechanism connecting the double-arm planar motion mechanism to the ship model, control the release and fixation of the heave and pitch motions of the ship model installed at the bottom of the double-arm planar motion mechanism, and measure the hydrodynamic forces received by the ship model under the condition of not affecting the free movement of the test ship model of the planar motion mechanism in still water and waves.

[0023] The present invention connects a positioning component, a balancing component and a fixed seat component to each other through a connecting rod and a bearing to form a quadrilateral structure that can move freely along a double-arm plane, and inserts a detachable fixing pin at the joint position of the positioning component and the balancing component; when using the double-arm planar motion mechanism to carry out motion response tests in still water and waves, the fixing pins of the "connecting claw" mechanism at both ends are pulled out to release the lifting and lowering, forward and backward movement of the fixed seat component in the double-arm plane, thereby realizing the heave and pitch movement of the ship model installed at the bottom of the double-arm planar motion mechanism; when using the double-arm planar motion mechanism to carry out force measurement tests in still water and waves, the fixing pin of the "connecting claw" mechanism at one end is pulled out, and the "connecting claw" at the other end remains fixedly connected to the ship model, thereby realizing the measurement of the hydrodynamic force exerted on the ship model without affecting the free movement of the ship model in the plane motion mechanism test in still water and waves.

[0024] The present invention has the characteristics of simple structure and can adapt to the requirements of various types of ship model tests. Through a simple device connection form, the measurement of movement and force in different types of ship model tests can be realized. It can be widely used in the design and application of double-arm planar motion mechanisms and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention.

[0026] Figure 2 It is a schematic diagram of the partial connection of a single arm of the present invention.

[0027] Figure 3 It is a side view of the present invention.

[0028] Among them: 1. Connecting rod; 2. No. 1 bearing; 3. Positioning component; 4. Balancing component; 5. Fixed seat component;

[0029] 6. Connecting bridge; 7. Fixing pin;

[0030] 8. Pointer; 9. Slider; 10. Pulley; 11. Bolt; 12. No. 2 bearing; 13. Positioning plate;.

[0031] 14. Pressure block; 15. Pressure rod; 16. Balance plate;

[0032] 17. Mounting plate; 18. Two-component force balance; 19. Fixing block;

[0033] 20. Ruler. DETAILED DESCRIPTION

[0034] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0035] like Figures 1-3As shown in the figure, the double - arm planar motion mechanism for wave pool force measurement in this embodiment includes a connecting bridge 6. On the horizontal direction of the connecting bridge 6, scales 20 are symmetrically arranged. At both ends of the connecting bridge 6, positioning members 3 are symmetrically arranged. At the bottom of a single positioning member 3, a balance member 4 is hinged. The middle of the positioning member 3 extends outward through a connecting rod 1, and at the head of the connecting rod 1, a fixed seat member 5 is installed and fixed through a first - type bearing 2. At the same time, the balance member 4 is also connected to the fixed seat member 5 through a first - type bearing 2. One fixed seat member 5 is connected to the bow of the ship, and the other fixed seat member 5 is connected to the stern of the ship;

[0036] A fixed pin 7 is installed at the connection position between the positioning member 3 and the balance member 4;

[0037] The structure of a single positioning member 3 is as follows: It includes a positioning plate 13. The middle of the positioning plate 13 is connected to the connecting rod 1 through a second - type bearing 12. At the top of the positioning plate 13, spaced sliders 9 are installed through bolts 11. On the sliders 9, pulleys 10 are installed, and the pulleys 10 are connected to the connecting bridge 6;

[0038] The structure of a single balance member 4 is as follows: It includes a horizontal balance plate 16 connected to the positioning plate 13 through a first - type bearing 2. One end of the balance plate 16 is connected to the fixed seat member 5, and the other end of the balance plate 16 is installed with a pressing block 14 through a pressure rod 15;

[0039] The structure of the fixed seat member 5 is as follows: It includes a mounting plate 17 connected to both the connecting rod 1 and the balance plate 16 through a first - type bearing 2. At the bottom of the mounting plate 17, a two - component balance 18 is installed, and at the bottom of the two - component balance 18, a fixed block 19 is installed.

[0040] The fixed pin 7 is detachable.

[0041] The connecting rod 1 and the first - type bearing 2 connect the positioning member 3, the balance member 4, and the fixed seat member 5 to each other to form a quadrilateral structure.

[0042] A pointer 8 is installed on the positioning plate 13 between the two pulleys 10, and the pointer 8 corresponds to the scale 20.

[0043] According to the actual position of the pointer 8, the longitudinal position of the center of gravity of the two - side mechanisms is adjusted to be consistent with the rotation center of the connecting bridge 6.

[0044] The pressing block 14 adopts a cuboid structure or a cube structure.

[0045] The two pressing blocks 14 are arranged oppositely.

[0046] The balance plate 16 has a long - strip structure.

[0047] The connecting rod 1 is perpendicular to the mounting plate 17.

[0048] The balance plate 16 is perpendicular to the mounting plate 17.

[0049] The specific connection form of a double - arm planar motion mechanism for wave pool force measurement described in this embodiment is as follows:

[0050] The positioning member 3, the balance member 4, and the fixed - seat member 5 are interconnected into a quadrilateral structure through the connecting rod 1 and the first bearing 2, connected to the bottom connecting bridge 6 of the planar motion mechanism, and a detachable fixed pin 7 is inserted at the connection position between the positioning member 3 and the balance member 4.

[0051] The positioning member 3 includes a pointer 8, a slider 9, a pulley 10, a bolt 11, a second bearing 12, and a positioning plate 13.

[0052] The balance member 4 includes a pressure block 14, a pressure rod 15, the first bearing 2, and a balance plate 16.

[0053] The fixed - seat member 5 includes a mounting plate 17, a two - component balance 18, the first bearing 2, and a fixed block 19.

[0054] The positioning member 3 is connected to the bottom connecting bridge 6 of the planar motion mechanism through the pulley 10 horizontally and vertically installed on the slider 9 and can translate along the length direction of the connecting bridge 6. Further, the position of the force - measuring point of the ship model is located by referring to the scale 20 installed on the connecting bridge 6 pointed by the pointer 8. Through the action of the first bearing 2, one end of the balance member 4 is connected to the fixed - seat member 5, the balance plate 16 is connected to the bottom of the positioning member 3 near the middle position, and the other end is installed with the pressure block 14 through the pressure rod 15.

[0055] The top and middle of the mounting plate 17 of the fixed - seat member 5 are respectively connected to the connecting rod 1 and the balance plate 16 through the first bearing 2, and the top and bottom of the two - component balance 18 are respectively fixedly connected to the mounting plate 17 and the fixed block 19.

[0056] During the ship model test, the front and rear fixed - seat members 5 of the double - arm planar motion mechanism are respectively fixedly connected to the installation points of the ship model, and the longitudinal position of the model's center of gravity is adjusted to be consistent with the rotation center of the connecting bridge 6 by referring to the actual position of the pointer 8 of the positioning member 3. The top of the double - arm planar motion mechanism is fixedly connected to the trailer, and the bottom double arms are respectively connected to the head and tail of the ship model.

[0057] When conducting the motion response test in waves using the double - arm planar motion mechanism described in this embodiment, the fixed pins 7 at both ends are pulled out to release the lifting and forward - backward movement of the fixed - seat member 5 within the double - arm plane, thereby realizing the heaving and pitching motions of the ship model installed at the bottom of the double - arm planar motion mechanism.

[0058] When conducting hydrostatic and wave force measurement tests using a double-arm planar motion mechanism, the fixed pin 7 of the "connecting claw" mechanism at the stern of the ship is pulled out, and the "connecting claw" at the bow of the ship is inserted into the fixed pin 7 and kept fixedly connected to the ship model. Thus, under the condition of not affecting the free movement of the test ship model of the planar motion mechanism in hydrostatic and waves, the positioning of the longitudinal forces F x船艏 、F x船艉 and the transverse forces F y船艏 、F y船艉 acting on the two force measurement points at the bow and stern of the ship model along the longitudinal direction of the ship's length are measured. When the longitudinal distances of the force measurement points at the bow and stern from the center of gravity of the ship model are x 船艏 、x 船艉 respectively, the longitudinal force F X 、the transverse force F Y and the yaw moment M z acting on the whole ship model can be expressed as follows.

[0059]

[0060] In this embodiment, the movement of the ship model and the measurement of the hydrodynamic forces acting on it are realized as follows:

[0061] It mainly consists of a positioning member 3, a balancing member 4, a fixed seat member 5, and a pin and a connecting rod 1 for fixing / releasing the movement.

[0062] Among them, the positioning member 3 includes a pointer 8, a slider 9, a pulley 10, a bolt 11, a bearing, and a positioning plate 13.

[0063] Among them, the balancing member 4 includes a pressing block 14, a pressing rod 15, a bearing, and a balancing plate 16.

[0064] The fixed seat member 5 includes a mounting plate 17, a two-component balance 18, a bearing, and a fixing block 19.

[0065] The principle by which the connection form of this embodiment plays the above role lies in that in the "connection claw" mechanism of the double-arm planar motion mechanism, the positioning member 3, the balancing member 4, and the fixed seat member 5 are interconnected through the connecting rod 1 and the bearing to form a quadrilateral structure that can move freely along the double-arm plane. A detachable fixed pin 7 is inserted at the connection position between the positioning member 3 and the balancing member 4. The quadrilateral structure can reduce the force on the fixed pin 7 during the test of the planar motion mechanism and reduce the risk of fracture, and does not affect the measurement of the force on the hull. When conducting the motion response test in waves using the double-arm planar motion mechanism, the fixed pins 7 of the connection claws at both ends are pulled out to release the lifting and forward and backward movements of the fixed seat member 5 within the double-arm plane, thereby realizing the heaving and pitching movements of the ship model installed at the bottom of the double-arm planar motion mechanism. When conducting the hydrostatic and wave force measurement tests using the double-arm planar motion mechanism, the fixed pin 7 of one end connection claw mechanism is pulled out, and the other end "connection claw" remains fixedly connected to the ship model, thereby realizing the measurement of the hydrodynamic force on the ship model under the condition of not affecting the free movement of the ship model in the hydrostatic and wave planar motion mechanism tests.

[0066] The connection form of the double-arm planar motion mechanism has the characteristics of simple structure and being able to meet the test requirements of various types of ship models. Through a simple device connection form, the measurement of motion and force in ship model tests under different environmental conditions can be achieved, and it can be widely applied to the design and application of double-arm planar motion mechanisms, with good development prospects.

[0067] The above description is an explanation of the present invention, not a limitation of the invention. For the scope defined by the present invention, refer to the claims. Within the protection scope of the present invention, any form of modification can be made.

Claims

1. A two-arm planar motion mechanism for wave pool force measurement, characterized in that: The invention comprises a connecting bridge (6), wherein scales (20) are symmetrically arranged in the horizontal direction of the connecting bridge (6), positioning components (3) are symmetrically arranged at both ends of the connecting bridge (6), a balancing component (4) is hingedly connected to the bottom of a single positioning component (3), the middle part of the positioning component (3) extends outward through a connecting rod (1), and a fixing seat component (5) is installed at the head of the connecting rod (1) through a No. 1 bearing (2), and the balancing component (4) is also connected to the fixing seat component (5) through a No. 1 bearing (2), wherein one fixing seat component (5) is connected to the bow, and the other fixing seat component (5) is connected to the stern; A fixing pin (7) is installed at the joint position between the positioning component (3) and the balancing component (4); The structure of a single positioning member (3) is as follows: it comprises a positioning plate (13), the middle part of the positioning plate (13) is connected to the connecting rod (1) via a No. 2 bearing (12), a spaced slider (9) is installed on the top of the positioning plate (13) via a bolt (11), a pulley (10) is installed on the slider (9), and the pulley (10) is connected to the connecting bridge (6); The structure of a single balancing member (4) is as follows: it comprises a horizontal balancing plate (16) connected to a positioning plate (13) via a No. 1 bearing (2), one end of the balancing plate (16) is connected to a fixed seat member (5), and the other end of the balancing plate (16) is mounted with a pressing block (14) via a pressing rod (15); The structure of the fixed seat component (5) is as follows: it includes a mounting plate (17) connected to the connecting rod (1) and the balance plate (16) through a No. 1 bearing (2), a two-component force balance (18) is installed at the bottom of the mounting plate (17), and a fixing block (19) is installed at the bottom of the two-component force balance (18).

2. A two-arm planar motion mechanism for wave pool force measurement according to claim 1, characterized in that: The fixing latch (7) is detachable.

3. A two-arm planar motion mechanism for wave pool force measurement according to claim 1, characterized in that: The connecting rod (1) and the No. 1 bearing (2) connect the positioning component (3), the balancing component (4) and the fixing seat component (5) to form a quadrilateral structure.

4. A two-arm planar motion mechanism for wave pool force measurement according to claim 1, characterized in that: A pointer (8) is installed on the positioning plate (13) between the two pulleys (10), and the pointer (8) corresponds to the scale (20).

5. A double-arm planar motion mechanism for wave pool force measurement as claimed in claim 4, characterized in that: According to the actual position of the pointer (8), the longitudinal position of the center of gravity of the mechanisms on both sides is adjusted to be consistent with the rotational movement center of the connecting bridge (6).

6. A two-arm planar motion mechanism for wave pool force measurement as claimed in claim 1, characterized in that: The pressing block (14) adopts a rectangular parallelepiped structure or a cube structure.

7. A two-arm planar motion mechanism for wave pool force measurement as claimed in claim 1, characterized in that: The two pressing blocks (14) are arranged opposite to each other.

8. A double-arm planar motion mechanism for wave pool force measurement as claimed in claim 1, characterized in that: The balance plate (16) is in the shape of a long strip.

9. A double-arm planar motion mechanism for wave pool force measurement as claimed in claim 1, characterized in that: The connecting rod (1) and the mounting plate (17) are arranged vertically.

10. A double-arm planar motion mechanism for wave pool force measurement as claimed in claim 1, characterized in that: The balancing plate (16) and the mounting plate (17) are arranged vertically.

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