Rudder model device for rudder open water test

Abstract

The invention relates to a rudder model device for a rudder open water test, and the device is characterized in that a driving part is arranged in the middle of a support, and is connected with a connecting rod through a coupler; one end, far away from the driving piece, of the connecting rod penetrates through the wave suppression plate and the flow guide section to be in key connection with a key groove in the force balance rear cone; the rudder model comprises a rudder blade model and a rudder horn model, a front cone of the force measuring balance is inserted into the rudder blade model to be fixed, the rudder horn model is fixed on the wave suppression plate through a rudder horn mounting rod, and the force measuring balance coincides with the stress center of the rudder model; the device can be used for an open water test of a rudder, can be used together with a measuring device with a rod-type force-measuring balance, can reduce the heeling moment generated by the normal force of a rudder blade on the force-measuring balance, reduces the coupling interference of the heeling moment on signals such as the tangential force, the normal force and the steering torque of the rudder blade, improves the measurement precision of the hydrodynamic coefficient of the rudder, and improves the measurement accuracy of the hydrodynamic coefficient of the rudder. Reasonable design of a rudder structure and a rudderstock can be improved, then model selection of a steering engine is guided, and maneuverability of a ship is improved.

Description

Technical Field

[0001] The invention relates to the field of ship maneuverability test, and in particular to a rudder model device used for rudder open water test. Background Art

[0002] The maneuverability of a ship has a vital impact on its navigation safety and operational economy. Good maneuverability requires a maneuvering device with excellent hydrodynamic performance. The rudder is one of the commonly used maneuvering devices for ships. The hydrodynamic coefficients of the rudder, such as the lift coefficient and the drag coefficient, or the tangential force coefficient and the normal force coefficient, can be measured by the open water test method. The accurate acquisition of these coefficients lays the foundation for the structural design of the rudder, the design of the rudder stock, the selection of the steering gear, and the evaluation of the maneuverability of the ship. At present, a cylindrical three-force (or six-force) balance is often used to carry out the open water test of the rudder. During the test, the rudder is connected to the three-force (or six-force) balance through the rudder stock, and the hydrodynamic force on the rudder is measured by the balance. This method has no special requirements for the rudder model, but in order to avoid the splash of the rudder stock from wetting the balance, the balance needs to be fixed at a certain distance above the water surface and far away from the force center of the rudder blade, so that the normal force of the rudder produces a large heeling moment on the balance, which affects the measurement accuracy of the balance on the tangential force, normal force and torsional moment of the rudder, resulting in a large error in the rudder open water test. Summary of the invention

[0003] Aiming at the problem that the installation position of the three-component (or six-component) force balance is far away from the force center of the rudder, the balance is subjected to a large heeling moment, which will produce coupling interference on the tangential force, normal force and torsional moment signals measured by the balance, thus affecting the accuracy of the measurement of the rudder hydrodynamic performance. A rudder model device for rudder open water test is proposed.

[0004] The technical solution of the present invention is: a rudder model device for rudder open water test, comprising a bracket, a driving member is arranged in the middle of the bracket, and the driving member is connected through a coupling and a connecting rod; one end of the connecting rod away from the driving member passes through a wave crushing plate and a guide section and is fixedly connected to the rear cone of a force measuring balance; the rudder model comprises a rudder blade model and a rudder arm model, the front cone of the force measuring balance is inserted into the rudder blade model and fixed, the force centers of the force measuring balance and the rudder model coincide, one end of a rudder arm mounting rod is fixedly connected to the rudder arm model, and the end away from the rudder arm model is fixedly connected to the wave crushing plate.

[0005] Preferably, the connecting rod is keyed to a keyway on the rear cone of the force measuring balance.

[0006] Preferably, one end of the rudder hanging arm mounting rod is inserted into the rudder hanging arm model and fixedly connected to the rudder hanging arm model by a fixing bolt.

[0007] Preferably, the rudder model also includes a steel pipe, and the steel pipe is inserted into the rudder blade model and the rudder arm model.

[0008] Preferably, a bolt hole is opened in the middle of the rudder blade model, and stop bolts pass through the bolt holes of the rudder blade model and are pressed against the steel pipe, so that the rudder blade model is fixedly connected to the steel pipe through the stop bolts.

[0009] Preferably, a flange mounting seat is provided on the upper surface of the wave crushing plate, a plurality of bolt holes are provided on the flange mounting seat, and the flange mounting seat is fixedly connected to the wave crushing plate through a plurality of flange bolts.

[0010] Preferably, the end of the rudder arm mounting rod away from the rudder arm model passes through the wave crushing plate and the flange mounting seat, and is fixedly connected with the flange mounting seat through a stop bolt after being adjusted to a suitable position up and down.

[0011] Preferably, the steel pipe is provided with a step on the inner wall near the lower end, and a tapered sleeve is provided on the inner wall near the lower end of the steel pipe, and the tapered hole end face of the tapered sleeve is in contact with the step end face.

[0012] Preferably, the inclination of the cone surface of the cone sleeve is the same as the inclination of the front cone of the force measuring balance, the front cone of the force measuring balance cooperates with the cone surface of the cone sleeve in the rudder model, a threaded hole is opened on the front cone of the force measuring balance, and the hexagon socket bolt passes through the gasket and the cone sleeve to be fixedly connected to the force measuring balance.

[0013] Preferably, a bolt hole is provided at a position of the cone sleeve away from the cone hole, and a bolt hole with the same diameter is also provided at a corresponding position of the steel pipe, and the cone sleeve and the steel pipe are fixedly connected by connecting bolts.

[0014] The beneficial effects of the present invention are as follows: the rudder model device for the rudder open water test of the present invention can be used for the open water test of the rudder, and when used together with a measuring device having a rod-type dynamometer balance, it can reduce the heeling moment generated by the normal force of the rudder blade on the dynamometer balance, reduce the coupling interference of the heeling moment on signals such as the rudder blade tangential force, normal force and steering torque, improve the measurement accuracy of the rudder hydrodynamic coefficient, improve the reasonable design of the rudder structure and the rudder stock, and further guide the selection of the steering gear and improve the maneuverability of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view schematic diagram of a rudder model device used for rudder open water test of the present invention;

[0016] Figure 2 It is a front view schematic diagram of the rudder model of the present invention;

[0017] Figure 3 Schematic diagram of a top view of a wave crusher of the present invention;

[0018] Figure 4 It is a structural schematic diagram of the steel pipe and the cone sleeve of the present invention;

[0019] Figure 5 for Figure 4A partial enlarged view of part A.

[0020] In the figure, the component names corresponding to the reference numerals are as follows:

[0021] 1. Bracket; 2. Driving part; 3. Connecting rod; 4. Squeeze plate; 41. Flange mounting seat; 411. Flange bolt; 5. Guide section; 6. Force balance; 7. Rudder model; 71. Rudder blade model; 72. Rudder arm model; 73. Rudder arm mounting rod; 731. Fixing bolt; 74. Steel pipe; 741. Stop bolt; 742. Step; 75. Cone sleeve; 751. Bolt hole; 752. Gasket; 76. Connecting bolt. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0023] refer to Figure 1 As shown, the present invention provides a rudder model device for rudder open water test, comprising a bracket 1, a driving member 2, a connecting rod 3, a wave crushing plate 4, a guide section 5 and a dynamometer 6; the bracket 1 supports the driving member 2, the connecting rod 3, the wave crushing plate 4, the guide section 5 and the dynamometer 6; the driving member 2 is arranged in the middle of the bracket 1, the driving member 2 is a stepping motor, and the driving member 2 is connected to the connecting rod 3 through a coupling; the end of the connecting rod 3 away from the driving member 2 passes through the wave crushing plate 4 and the guide section 5 and is connected to the keyway key on the rear cone of the dynamometer 6, and is fastened with an inclined wedge, and the dynamometer 6 is a rod-type dynamometer; the front cone of the dynamometer 6 is inserted into the rudder model 7 for fixing; the force centers of the dynamometer 6 and the rudder model 7 coincide, the heeling force arm of the rudder model 7 is reduced, thereby reducing the heeling moment generated by the normal force of the rudder model 7 on the dynamometer, and reducing the coupling interference of the heeling moment on the force measurement signal of the dynamometer, thereby improving the test accuracy of the rudder hydrodynamic coefficient.

[0024] refer to Figure 2As shown, the rudder model 7 includes a rudder blade model 71, a rudder arm model 72, a rudder arm mounting rod 73, a steel pipe 74 and a taper sleeve 75. The rudder blade model 71 and the rudder arm model 72 are made of resin material and can be made by 3D printing to ensure the strength and rigidity of the model; one end of the rudder arm mounting rod 73 is inserted into the rudder arm model 72, and the rudder arm mounting rod 73 and the rudder arm model 72 are respectively provided with two bolt holes, and two fixing bolts 731 pass through the rudder arm model 72 and the rudder arm mounting rod 73 in sequence, and the two are fixedly connected after being tightened; the steel pipe 74 passes through the rudder blade model 71 and the rudder arm model 72, and the middle position of the rudder blade model 71 has two upper and lower bolt holes, and the stop bolts 741 pass through the upper and lower bolt holes of the rudder blade model 71 respectively and are pressed on the steel pipe 74, and the rudder blade model 71 is fixedly connected to the steel pipe 74 by the stop bolts 741, so that the rudder blade model 71 and the rudder arm model 72 are spliced ​​together;

[0025] The steel pipe 74 is fixedly connected to the rudder blade model 71 by two upper and lower stop bolts 741, ensuring that there is no up and down movement or relative rotation between the steel pipe 74 and the rudder blade model 71; the stop bolts 741 cannot pass through the steel pipe 74, otherwise it is easy to contact with the force measuring balance 6 in the steel pipe 74, affecting the test accuracy of the force measuring balance 6;

[0026] refer to Figure 1 , 3 As shown, the upper surface of the wave crushing plate 4 is provided with a flange mounting seat 41, and the flange mounting seat 41 is provided with bolt holes. The flange mounting seat 41 is fixedly connected to the wave crushing plate 4 through a plurality of flange bolts 411. Figure 3 In this embodiment, there are four flange bolts 411; one end of the rudder arm mounting rod 73 away from the rudder arm model 72 passes through the wave crushing plate 4 and the flange mounting seat 41, and the flange mounting seat 41 has an opening. After adjusting the appropriate position up and down, the stop bolt passes through the hole opened on the flange mounting seat and is pressed on the rudder arm mounting rod 73. After the stop bolt is tightened, the two are fixedly connected. Figure 1 In this embodiment, there are two stop bolts at the top and bottom, so that the rudder arm model 72 is fixedly installed below the wave crushing plate 4 and the guide section 5;

[0027] The rudder arm model 72 is fixed on the wave crushing plate 4 of the measuring device through the rudder arm mounting rod 73 and the flange mounting seat 41. The flange mounting seat 41 is used to facilitate the adjustment of the upper and lower mounting positions of the rudder arm model 72 and the fixing operation.

[0028] refer to Figure 4 , 5 As shown, the steel pipe 74 is provided with a step 742 on the inner wall near the lower end, the inner diameter of the upper end of the step 742 is 24 mm, and the inner diameter of the lower end is 26 mm. A tapered sleeve 75 is provided on the inner wall near the lower end of the steel pipe 74, and the tapered hole end face of the tapered sleeve 75 is in close contact with the end face of the step 742;

[0029] The cone surface slope of the cone sleeve 75 is 1:5, which is the same as the slope of the front cone of the dynamometer 6. The front cone of the dynamometer 6 matches the cone surface of the cone sleeve 75 in the rudder model 7. A threaded hole is opened on the front cone of the dynamometer 6. The hexagon socket bolt passes through the gasket 752 and the cone sleeve 75 and is connected to the dynamometer 6. The front cone slope of the dynamometer 6 is in close contact with the cone sleeve surface, and there is no relative rotation between the two, thereby ensuring that the dynamometer 6 and the rudder model 7 do not rotate relative to each other;

[0030] The taper hole of the taper sleeve 75 is 18 mm, and a bolt hole 751 is provided 25 mm from the upper end. A bolt hole of the same diameter is also provided at a corresponding position of the steel pipe 74. The taper sleeve 75 and the steel pipe 74 are fixedly connected by connecting bolts 76, ensuring that there is neither up and down movement nor relative rotation between the taper sleeve 75 and the steel pipe 74, thereby ensuring that the rudder model 7 and the force measuring balance 6 are fixedly connected;

[0031] The steel pipe 74 has sufficient strength. When the rudder blade model 71 is not rotated, the tangential force is the largest. When it is rotated at a larger angle, the normal force is larger. The strain generated by the force measuring balance 6 reaches the maximum value, and the distance between the steel pipe 74 and the force measuring balance 6 reaches the minimum value. It is necessary to ensure that the minimum distance is not zero to avoid collision between the steel pipe 74 and the force measuring balance 6 and affect the test results.

[0032] The beneficial effects are as follows: the present invention can be used for open water testing of rudders, and when used together with a measuring device having a rod-type dynamometer 6, it can reduce the heeling moment caused by the normal force of the rudder blade on the dynamometer, reduce the coupling interference of the heeling moment on signals such as the rudder blade tangential force, normal force and steering torque, improve the measurement accuracy of the rudder hydrodynamic coefficient, improve the reasonable design of the rudder structure and the rudder stock, and further guide the selection of the steering gear and improve the maneuverability of the ship.

[0033] It should be noted that the orientations or positional relationships indicated by the above-mentioned terms "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. The terms "first", "second", etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. "Multiple" means two or more. "Installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection.

[0034] The above is only a preferred embodiment of the present invention, and is not any formal or substantial limitation of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the present invention, and these improvements and supplements should also be regarded as the protection scope of the present invention. Any technician familiar with this profession, without departing from the spirit and scope of the present invention, can make some changes, modifications and equivalent changes made by using the technical content disclosed above, which are equivalent embodiments of the present invention; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A rudder model device for rudder open water test, characterized in that: The invention comprises a bracket (1), a driving member (2) is arranged in the middle of the bracket (1), and the driving member (2) is connected to a connecting rod (3) via a coupling; one end of the connecting rod (3) away from the driving member (2) passes through a wave crushing plate (4) and a guide section (5) and is fixedly connected to the rear cone of a force measuring balance (6); the rudder model (7) comprises a rudder blade model (71) and a rudder arm model (72), the front cone of the force measuring balance (6) is inserted into the rudder blade model (71) and fixedly, and the force centers of the force measuring balance (6) and the rudder model (7) coincide with each other; one end of a rudder arm mounting rod (73) is fixedly connected to the rudder arm model (72), and the other end away from the rudder arm model (72) is fixedly connected to the wave crushing plate (4).

2. The rudder model device for rudder open water test according to claim 1, characterized in that: The connecting rod (3) is connected to the keyway on the rear cone of the force measuring balance (6).

3. The rudder model device for rudder open water test according to claim 1, characterized in that: One end of the rudder arm mounting rod (73) is inserted into the rudder arm model (72) and is fixedly connected to the rudder arm model (72) via a fixing bolt (731).

4. The rudder model device for rudder open water test according to claim 1, characterized in that: The rudder model (7) also includes a steel pipe (74), and the steel pipe (74) is inserted into the rudder blade model (71) and the rudder arm model (72).

5. The rudder model device for rudder open water test according to claim 4, characterized in that: A bolt hole is opened in the middle of the rudder blade model (71), and stop bolts (741) pass through the bolt holes of the rudder blade model (71) and are pressed against the steel pipe (74), so that the rudder blade model (71) and the steel pipe (74) are fixedly connected by the stop bolts (741).

6. The rudder model device for rudder open water test according to claim 1, characterized in that: The upper surface of the wave crushing plate (4) is provided with a flange mounting seat (41), and a plurality of bolt holes are provided on the flange mounting seat (41). The flange mounting seat (41) is fixedly connected to the wave crushing plate (4) via a plurality of flange bolts (411).

7. The rudder model device for rudder open water test according to claim 6, characterized in that: The end of the rudder arm mounting rod (73) away from the rudder arm model (72) passes through the wave crushing plate (4) and the flange mounting seat (41), and is fixedly connected to the flange mounting seat (41) by a stop bolt after being adjusted to a suitable position up and down.

8. The rudder model device for rudder open water test according to claim 4, characterized in that: The steel pipe (74) is provided with a step (742) on the inner wall near the lower end, and a tapered sleeve (75) is provided on the inner wall near the lower end of the steel pipe (74), and the tapered hole end face of the tapered sleeve (75) is in contact with the end face of the step (742).

9. The rudder model device for rudder open water test according to claim 8, characterized in that: The inclination of the conical surface of the conical sleeve (75) is the same as the inclination of the front cone of the dynamometer (6); the front cone of the dynamometer (6) matches the conical surface of the conical sleeve (75) in the rudder model (7); a threaded hole is formed on the front cone of the dynamometer (6); a hexagon socket bolt passes through a gasket (752) and the conical sleeve (75) to be fixedly connected to the dynamometer (6).

10. The rudder model device for rudder open water test according to claim 9, characterized in that: The cone sleeve (75) is provided with a bolt hole (751) away from the cone hole, and a bolt hole with the same diameter is also provided at a corresponding position of the steel pipe (74). The cone sleeve (75) and the steel pipe (74) are fixedly connected by connecting bolts (76).

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