CN113602443B - Two-point support-based three-degree-of-freedom motion testing mechanism in ship waves - Google Patents
Two-point support-based three-degree-of-freedom motion testing mechanism in ship waves Download PDFInfo
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- CN113602443B CN113602443B CN202110790302.3A CN202110790302A CN113602443B CN 113602443 B CN113602443 B CN 113602443B CN 202110790302 A CN202110790302 A CN 202110790302A CN 113602443 B CN113602443 B CN 113602443B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B71/00—Designing vessels; Predicting their performance
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Abstract
The invention discloses a two-point support-based mechanism for testing three-degree-of-freedom motion in ship waves, which belongs to the technical field of ship wave resistance experiments and comprises an operation frame, a rolling component, a heaving component and a pitching component; the rolling component comprises a rolling shaft, a rolling frame and a second connecting piece, the rolling frame is fixedly arranged on the inner wall of the ship, the rolling shaft penetrates through the rolling frame and is arranged along the central axis of the ship in the fore-aft direction, and the second connecting piece is fixedly arranged in the middle of the rolling shaft; the upper end of the heave component is arranged on the operating frame, the lower end of the heave component is connected to the second connecting piece through the first connecting piece, and the second connecting piece can rotate around the first connecting piece; the upper end of the pitching assembly is fixedly connected to the operation frame, and the lower end of the pitching assembly is arranged on the transverse rocking shaft and keeps rotating relative to the transverse rocking shaft. The invention takes the joint of the first connecting piece and the second connecting piece and the joint of the pitching assembly and the roll shaft as supporting points, and strengthens the constraint on the bow and roll motions of the ship and the structural strength of the mechanism by adopting a two-point supporting mode.
Description
Technical Field
The invention belongs to the technical field of ship wave resistance experiments, and particularly relates to a two-point support-based three-degree-of-freedom motion testing mechanism in ship waves.
Background
An unconstrained vessel may produce six degrees of freedom of swaying motion in waves, i.e., surge, sway and heave, roll, pitch and yaw. The ability of a vessel to maintain its normal function under the action of wind and waves is a considerable problem. The ship swaying is the main content of wave resistance, and the accurate acquisition of response data of the swaying motion of a ship model in waves is the most basic and the most critical problem. Because the wave resistance experiment of the ship model is generally completed in a towing tank and is limited by the structure of a trailer, the current experiment method cannot simultaneously and accurately measure the motion response of the ship model with six degrees of freedom, the ship needs to be restrained from moving with certain degrees of freedom, and only the response amplitude values of the rolling, pitching and heaving motions which are obvious in motion and seriously affected are tested.
Considering the mutual coupling effect of the swaying motion, the traditional experimental testing device is easily influenced by the yawing, the rigidity is insufficient, and the rotating shaft of the device is not superposed with the gravity center of the ship, so that the motion response of the rolling, pitching and heaving of the ship cannot be accurately measured. In order to solve the problems, the experimental device for completely releasing the heave, roll and pitch motions of the ship needs to be designed, and the mutual influence between the experimental device and the ship heave motion is reduced.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides a ship wave middle three-degree-of-freedom motion testing mechanism based on two-point support, and aims to restrain the swaying and yawing motions of a ship and release the pitching motions of the ship by taking the joint of a first connecting piece and a second connecting piece and the joint of a pitching assembly and a roll shaft as support points, so that the technical problem that the influence of the yawing motions cannot be completely eliminated by adopting a single-point support motion device in the ship wave motion testing mechanism in the prior art is solved.
In order to achieve the above object, according to one aspect of the present invention, there is provided a two-point support based three-degree-of-freedom motion testing mechanism in ship waves, comprising an operation frame, a rolling component, a heaving component and a pitching component;
the transverse rocking assembly is used for releasing transverse rocking motion of a ship and comprises a transverse rocking shaft, a transverse rocking frame and a second connecting piece, wherein the transverse rocking frame is fixedly arranged on the inner wall of the ship, the transverse rocking shaft penetrates through the transverse rocking frame and is arranged along the central axis of the fore-aft direction of the ship, and the second connecting piece is fixedly arranged in the middle of the transverse rocking shaft;
the heave assembly is used for releasing heave motion of a ship, the upper end of the heave assembly is arranged on the operating frame, the lower end of the heave assembly is connected to the second connecting piece through a first connecting piece, and the second connecting piece can rotate around the first connecting piece so as to release pitch motion of the ship;
the pitching assembly is a swinging arm structure formed by connecting a plurality of sections of independent pieces, the upper end of the pitching assembly is fixedly connected to the operating frame, and the lower end of the pitching assembly is arranged on the transverse rocking shaft and keeps rotating relative to the transverse rocking shaft; the connecting part of the first connecting piece and the second connecting piece and the connecting part of the pitching assembly and the roll shaft are used as supporting points to restrain the rolling and yawing motions of the ship and release the pitching motions of the ship.
Preferably, the pitch assembly comprises a swing arm support, a first swing arm and a second swing arm; the swing arm support frame is fixedly arranged on the operating frame; the left end of the first swing arm is rotatably arranged at the lower end of the swing arm support frame, and the right end of the first swing arm is rotatably arranged at the upper end of the second swing arm; the lower end of the second swing arm is connected with the transverse rocking shaft and can rotate along the front end of the transverse rocking shaft.
Preferably, the swing arm holder is vertically installed on the handling frame, and when the testing mechanism is not in operation, the counterweight is adjusted to make the first swing arm perpendicular to the swing arm holder and the second swing arm perpendicular to the first swing arm.
Preferably, the heave assembly comprises a heave bar, the upper end of the heave bar is positioned in the limit groove of the operation frame, and the lower end of the heave bar is fixedly connected to the first connecting piece.
Preferably, the heave assembly further comprises a heave bar fixing frame, the heave bar fixing frame is fixedly mounted in a limiting groove of the operation frame, and the heave bar is located in the heave bar fixing frame; the fixed frame of the lifting and sinking rod is used for limiting the lifting and sinking rod so that the lifting and sinking rod only moves vertically.
Preferably, the rotation axis of the first link about the second link passes through the centre of gravity of the vessel.
Preferably, the first connection member is a heave bar turret.
Preferably, the second connector is a criss-cross shaft.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1. according to the two-point support-based ship wave middle three-degree-of-freedom motion testing mechanism, the joint of the first connecting piece and the second connecting piece and the joint of the pitching assembly and the roll shaft are used as supporting points, and the constraint on ship yawing and rolling motion and the structural strength of the mechanism are enhanced by adopting a two-point support mode.
2. According to the ship wave middle three-degree-of-freedom motion testing mechanism based on two-point support, the cross shaft and the ship are in common gravity center, and the response amplitude of the ship in heave, pitch and roll can be accurately measured.
Drawings
Fig. 1 is a schematic structural diagram of a two-point support-based mechanism for testing three-degree-of-freedom motion in ship waves.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein: 1-an operation frame; 2-a heave bar; 3-a heave bar fixing frame; 4-a swing arm support; 5-a first swing arm; 6-a second swing arm; 7-a transverse rocking shaft; 8-horizontal cradle; 9-a first connector; 10-a second connector; 11-a ship.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the present invention, the fore-aft (front-rear) direction of the ship is referred to as the longitudinal direction and is represented by the x-axis. The port-starboard (left-right) direction is referred to as the lateral direction and is represented by the y-axis. The upper deck-bilge (up-down) direction of the ship is called the vertical direction and is indicated by the z-axis. Among them, the forward and backward shaking (play, swing) is called surging, the left and right shaking (play, swing) is called rolling, the up and down shaking (play, swing) is called heaving, the left and right shaking around the x axis is called rolling, the forward and backward shaking around the y axis is called pitching, and the fore and aft shaking around the z axis is called yawing.
As shown in fig. 1, the three-degree-of-freedom motion testing mechanism in ship waves based on two-point support provided by the invention comprises an operation frame 1, a rolling component for releasing rolling motion of a ship 11, a heaving component for releasing heaving motion of the ship 11 and a pitching component for releasing pitching motion of the ship 11.
Specifically, the roll assembly is composed of a roll shaft 7, a roll cradle 8 and a second link 10. The heave assembly consists of a heave rod 2, a heave rod fixing frame 3 and a first connecting piece 9. The pitch assembly is comprised of a swing arm support 4, a first swing arm 5 and a second swing arm 6.
As a preferred embodiment of the invention, said first connection 9 is a heave bar turret.
As a preferred embodiment of the present invention, the second connecting member 10 is a cross shaft.
In a further description, the operation frame 1 is mounted on a trailer, and the heave bar fixing frame 3 and the swing arm supporting frame 4 are fixedly connected with the operation frame 1 and keep a relative static state with the trailer. The fixed frame 3 of the heave bar only releases the vertical movement of the heave bar 2 and restrains other degrees of freedom. The first connecting piece 9 is fixedly connected with the heave bar 2, and the second connecting piece 10 can rotate around the first connecting piece 9 to release the pitching motion of the ship 11.
The middle part of the first swing arm 5 can rotate relatively around the swing arm support 4, the middle part of the second swing arm 6 can rotate relatively around the bottom part of the first swing arm 5, and the bottom part of the second swing arm 6 can rotate relatively around the transverse shaft 7, so that the first connecting piece 9 is matched to release the longitudinal swing motion of the ship 11 and restrain the yawing motion and the heading motion of the ship 11. The second connection 10 is arranged at the centre of gravity of the vessel 11, the roll shaft 7 extends through and is fixed relative to the vessel, and the roll cradle 8 is arranged to release the roll motion of the vessel 11 about the roll shaft 7.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A ship wave middle three-degree-of-freedom motion testing mechanism based on two-point support is characterized by comprising an operation frame (1), a rolling component, a heaving component and a pitching component;
the rolling component is used for releasing rolling motion of a ship and comprises a rolling shaft (7), a rolling frame (8) and a second connecting piece (10), the rolling frame (8) is fixedly arranged on the inner wall of the ship (11), the rolling shaft (7) penetrates through the rolling frame (8) and is arranged along the central axis of the ship in the fore-aft direction, and the second connecting piece (10) is fixedly arranged in the middle of the rolling shaft (7);
the heaving assembly is used for releasing heaving motion of a ship, the upper end of the heaving assembly is arranged on the operating frame (1), the lower end of the heaving assembly is connected to the second connecting piece (10) through the first connecting piece (9), and the second connecting piece (10) and the first connecting piece (9) rotate mutually to release pitching motion of the transverse rocking shaft (7) and the ship;
the pitching assembly is a swinging arm structure formed by connecting a plurality of sections of independent parts, the upper end of the pitching assembly is fixedly connected to the operating frame (1), and the lower end of the pitching assembly is arranged on the transverse rocking shaft (7) and keeps relative rotation with the transverse rocking shaft (7); the connection part of the first connecting piece (9) and the second connecting piece (10) and the connection part of the pitching assembly and the roll shaft (7) are used as supporting points to restrain the rolling and yawing motions of the ship and release the pitching motions of the ship;
the heave assembly comprises a heave rod (2), the upper end of the heave rod (2) is positioned in a limiting groove of the operating frame (1), and the lower end of the heave rod is fixedly connected to the first connecting piece (9);
the heave assembly further comprises a heave rod fixing frame (3), the heave rod fixing frame (3) is fixedly arranged in a limiting groove of the operating frame (1), and the heave rod (2) is positioned in the heave rod fixing frame (3); the heave bar fixing frame (3) is used for limiting the heave bar (2) so that the heave bar (2) only moves vertically.
2. The mechanism for testing three degrees of freedom motion in a ship wave based on two-point support is characterized in that the pitching assembly comprises a swinging arm support (4), a first swinging arm (5) and a second swinging arm (6); the swing arm support frame (4) is fixedly arranged on the operating frame (1); the left end of the first swing arm (5) is rotatably arranged at the lower end of the swing arm support (4), and the right end of the first swing arm (5) is rotatably arranged at the upper end of the second swing arm (6); the lower end of the second swing arm (6) is connected with the transverse rocking shaft (7) and can rotate along the front end of the transverse rocking shaft.
3. The mechanism for testing the three-degree-of-freedom motion in the wave of a ship based on two-point support is characterized in that the swing arm support (4) is vertically installed on the handling frame (1), and when the testing mechanism is not in operation, the balance weight is adjusted to enable the first swing arm (5) to be vertical to the swing arm support (4), and the second swing arm (6) to be vertical to the first swing arm (5).
4. The mechanism for testing three degrees of freedom in motion in vessel waves based on two-point support is characterized in that the rotation axis of the first connecting piece (9) rotating around the second connecting piece (10) passes through the gravity center of the vessel (11).
5. The mechanism for testing three degrees of freedom motion in vessel waves based on two-point support is characterized in that the first connecting piece (9) is a heave bar rotating frame.
6. The two-point support based three-degree-of-freedom motion testing mechanism for ship waves in waves as claimed in claim 1, wherein the second connecting member (10) is a cross shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110790302.3A CN113602443B (en) | 2021-07-13 | 2021-07-13 | Two-point support-based three-degree-of-freedom motion testing mechanism in ship waves |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110790302.3A CN113602443B (en) | 2021-07-13 | 2021-07-13 | Two-point support-based three-degree-of-freedom motion testing mechanism in ship waves |
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| CN113602443A CN113602443A (en) | 2021-11-05 |
| CN113602443B true CN113602443B (en) | 2022-07-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100520820B1 (en) * | 2003-07-31 | 2005-10-12 | 한국해양연구원 | A control performance deduction model examination device of the vessel |
| CN102636331A (en) * | 2012-05-04 | 2012-08-15 | 哈尔滨工程大学 | Motion and resistance testing device for ship and marine structures |
| CN104062092B (en) * | 2014-07-09 | 2016-08-24 | 中国船舶重工集团公司第七○二研究所 | Measuring mechanism in ship model rotating arm experiment |
| CN104118532B (en) * | 2014-07-28 | 2016-03-09 | 中国船舶重工集团公司第七○二研究所 | Hydrodynamic performance measuring mechanism in ship model wave in stability test device |
| CN105841918A (en) * | 2016-03-18 | 2016-08-10 | 哈尔滨工业大学（威海） | Self-propelled ship model test device applicable to arbitrary wave direction and application method for the same |
| KR101810475B1 (en) * | 2016-04-26 | 2017-12-19 | 국방과학연구소 | Device and test method to obtain maneuvering hydrodynamic derivatives for high speed vessel |
| CN109883648B (en) * | 2019-03-05 | 2021-03-30 | 哈尔滨工程大学 | Forced six-freedom-degree motion instrument |
| CN110065591A (en) * | 2019-05-10 | 2019-07-30 | 中国船舶工业集团公司第七0八研究所 | Test the dragging experimental rig of ship freedom degree |
| CN110207950B (en) * | 2019-07-03 | 2021-01-29 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Towing device of pool ship model in waves and test method thereof |
| CN112683320A (en) * | 2020-12-15 | 2021-04-20 | 哈尔滨工程大学 | Three-degree-of-freedom airworthiness instrument experiment platform |
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