CN110617941A - Device and method for testing drag resistance at fixed depth - Google Patents

Device and method for testing drag resistance at fixed depth Download PDF

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Publication number
CN110617941A
CN110617941A CN201910850572.1A CN201910850572A CN110617941A CN 110617941 A CN110617941 A CN 110617941A CN 201910850572 A CN201910850572 A CN 201910850572A CN 110617941 A CN110617941 A CN 110617941A
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CN
China
Prior art keywords
towing
rope
depth
fixed pulley
testing
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Pending
Application number
CN201910850572.1A
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Chinese (zh)
Inventor
陈小军
王力求
张达
孙佳宾
叶全虎
傅勇
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715th Research Institute of CSIC
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715th Research Institute of CSIC
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Application filed by 715th Research Institute of CSIC filed Critical 715th Research Institute of CSIC
Priority to CN201910850572.1A priority Critical patent/CN110617941A/en
Publication of CN110617941A publication Critical patent/CN110617941A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M10/00Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels

Abstract

The invention discloses a device and a method for depth-setting test drag resistance, which mainly comprise a test instrument, a first fixed pulley, a second fixed pulley, a drag line array, a rigid depth-setting rod, a drag rope and a fixed structure, wherein one end of the rigid depth-setting rod is hinged with the fixed structure so as to rotate for a certain angle around the fixed structure; the tow rope restores horizontal installation after inclining downwards through the first fixed pulley and the second fixed pulley which are arranged at the two ends of the rigid depthkeeping rod, the wet end of the tow rope is connected with the tow linear array, and the other end of the tow rope penetrates through the second fixed pulley, the first fixed pulley and the testing instrument to be connected with the bearing supporting structure. The invention can realize the horizontal dragging and flow resistance test of equipment with different structures and shapes under different depths, different dragging speeds and different flow velocities; the device is simple to lay and accurate to measure; the test is easy to be carried out in lake and sea environment; the system can effectively support and verify the design of towing depth, towing attitude, structural strength, vibration reduction and isolation parameters and the like of equipment such as the towed linear array sonar.

Description

Device and method for testing drag resistance at fixed depth
Technical Field
The invention relates to the field of fluid mechanics measurement of flow resistance test in the dragging process of underwater equipment, in particular to a device and a method for testing dragging resistance at a fixed depth.
Background
The towing line array is an important means for underwater target detection, ocean noise measurement and submarine resource survey, and can achieve the arrangement of water layers at different depths through the length adjustment and the towing speed adjustment of a tail microgravity towing cable of a ship or the control of different submergence depths of a submarine, thereby realizing the measurement of noise signals and the warning, tracking and positioning of underwater acoustic targets. With the vigorous development of China in the ocean field and the rapid upgrade of naval equipment, the application range of the underwater towed line array is wider and wider.
The towing line array is generally a neutral density array, is calibrated for towing resistance tests at different towing speeds, and can provide guidance for controlling towing depth, designing structural strength, even array noise suppression and attitude optimization. At present, the determination of the dragging resistance of the dragging linear array mainly adopts a theoretical estimation and laboratory test method, and the operations of structural strength design, dragging resistance adjustment, dragging depth control and the like of the array are developed according to the estimation and test results.
The prior art mainly has the following technical problems:
at present, the towing resistance of towing sonar equipment is mostly obtained by theoretical or empirical formula calculation, and the parameter selection and the difference of the structure shape of a towed body cause that great errors exist in the towing resistance calculation, so that great deviations of the design such as the cable laying length for towing depth control, vibration reduction and isolation parameters of vibration reduction and isolation modules of a towing line array and the like are caused;
although the towing resistance can be accurately measured by testing the towing tension of the towing linear array in a laboratory, the change of the towing resistance in the whole towing process cannot be accurately reflected, and the test towing linear array scale is greatly limited;
by adopting the towing tension test equipment mounted at the stern of the towing boat, although the towing linear array, the towing body and the like can be towed and tested in an actual working environment, the towing process has a certain inclination angle due to the fact that the acting point of the towing tension test equipment is higher than the water surface, and the towing tension test has a certain deviation, so that the towing speed is easy to be unstable; and at high towing speed, the tested towed linear array or towed body can jump out of the water surface, so that the test is failed (see figure 4), and the towing speed of the test is greatly limited.
In summary, the current measurement and calculation method cannot accurately test the drag resistance of the drag line array and the drag body in the actual water area environment, so that guidance cannot be provided for the design of the drag depth and the vibration reduction and isolation module.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a device and a method for testing drag resistance at a fixed depth.
The purpose of the invention is achieved by the following technical scheme: a device for testing dragging resistance at a fixed depth mainly comprises a testing instrument, a first fixed pulley, a second fixed pulley, a dragging line array, a rigid fixed depth rod, a dragging rope and a fixed structure, wherein one end of the rigid fixed depth rod is hinged with the fixed structure so as to rotate for a certain angle around the fixed structure, the other end of the rigid fixed depth rod is connected with a pulley seat of the second fixed pulley, and the pulley seat of the first fixed pulley is fixedly connected to the fixed structure; the rigid depth-fixing rod is downwards arranged below the water surface at a certain angle, the towing rope is downwards inclined through the first fixed pulley and the second fixed pulley which are arranged at the two ends of the rigid depth-fixing rod and then is horizontally installed, the wet end of the towing rope is connected with the towing line array, and the other end of the towing rope penetrates through the second fixed pulley, the first fixed pulley and the testing instrument and is connected with the bearing supporting structure.
Furthermore, the test instrument is a standard tension meter, the bearing support structure is a roller of a winch, the winch is installed on a test ship to form a test ship installation scheme, and the winch is connected with the towing rope and retracts the towing rope at a certain speed in the test ship installation scheme.
Furthermore, the test instrument is a standard tension meter, and the bearing support structure is fixed on the towing boat to form a towing boat installation scheme.
Furthermore, the hauling rope adopts a neutral buoyancy and weak positive buoyancy hauling rope.
Furthermore, a second dragging rope limit and a first dragging rope limit are respectively arranged at the two ends of the rigid depth fixing rod, which are close to the second fixed pulley and the first fixed pulley.
Furthermore, the middle part of the rigid depth fixing rod is connected with a protection rope, and the protection rope is connected with the ship body.
The invention also discloses a measuring method adopting the device for testing the drag resistance at the fixed depth, which comprises the following specific steps:
1. dragging the linear array to fix the depth and install and lay: the method comprises the following steps that a testing device is installed on a test ship or a towing boat through a fixed structure, a sleeved rigid depth-fixing rod is arranged below the water surface to a certain depth according to the requirements of the scale and density of a towing line array, a towing rope is threaded on the testing device, the dry end of the towing rope is connected with a roller of a winch or connected with a bearing support structure, a standard tensiometer is additionally arranged on the towing rope in the testing device, a standard tensiometer is additionally arranged between the towing rope and the bearing support structure in the testing device, the wet end of the towing rope is connected with the testing towing line array, a protection rope is connected with a ship body, and the testing towing line array is towed to a certain offshore distance;
2. and (3) measuring the drag resistance: the winch is started or the boat is towed, the rigid depth fixing rod swings open in the opposite direction of towing, the tail end of the rigid depth fixing rod is guaranteed to be not at a certain depth underwater through reverse tension of the protection rope, a tow line array driving neutral buoyancy is towed and advances horizontally underwater, the flow resistance of the tow rope and the flow resistance of the tow line array are transmitted through the tow rope, the drag rope is transmitted to a tow rope dry end through a second fixed pulley and a first fixed pulley, the tension of the tow rope is tested and recorded through a standard tension meter or a standard tension meter, and the tow flow resistance is obtained.
The invention has the beneficial effects that: the invention can be applied to the measurement of the drag resistance of equipment such as an underwater drag linear array, a drag body and the like at different drag speeds, and can also be applied to the rapid and reliable measurement of the scouring force of water flow under the installation water surface and under different flow rates; the horizontal dragging and flow resistance test of equipment with different structures and shapes can be realized at different depths and different dragging speeds and flow velocities; the device is simple to arrange and accurate in measurement, and the measurement result can provide a basis for the structure, shape and strength design of the underwater towing equipment; the test is easy to be carried out in lake and sea environment and is not limited by parameters such as array section scale, array section diameter and the like; the system can effectively support and verify the design of towing depth, towing attitude, structural strength, vibration reduction and isolation parameters and the like of equipment such as the towed linear array sonar.
Drawings
FIG. 1 is a schematic view of the test vessel installation operation of the present invention.
Fig. 2 is a schematic view of the towing boat installation operation of the present invention.
Fig. 3 is a structural front view of the present invention.
Fig. 4 is a diagram illustrating the underwater drag resistance test values before five towed bodies jump out of the water (the drag force point is higher than the water surface).
Fig. 5 is a top view of the structure of the present invention.
Description of reference numerals: the device comprises a testing device 1, a towing line array 2, a winch 3, a test ship 4, a towing boat 5, a rigid depth-fixing rod 6, a first fixed pulley 7, a first towing rope limit 8, a towing rope 9, a protection rope 10, a second fixed pulley 11, a second towing rope limit 12, a bearing supporting structure 13, a standard tension meter 14, a standard tension meter 15 and a fixing structure 16.
Detailed Description
The invention will be described in detail with reference to the following figures and examples:
as shown in the attached drawings, the device for testing the dragging resistance at the fixed depth mainly comprises a testing instrument, a first fixed pulley 7, a second fixed pulley 11, a dragging line array 2, a rigid fixed depth rod 6, a dragging rope 9 and a fixed structure 16, wherein one end of the rigid fixed depth rod 6 is hinged with the fixed structure 16 so as to rotate for a certain angle around the fixed structure 16, the other end of the rigid fixed depth rod 6 is connected with a pulley seat of the second fixed pulley 11, and the pulley seat of the first fixed pulley 7 is fixedly connected on the fixed structure 16; the rigid depth rod 6 is downwards arranged below the water surface at a certain angle, the towing rope 9 is downwards inclined through a first fixed pulley 7 and a second fixed pulley 11 which are arranged at two ends of the rigid depth rod 6 and then is horizontally installed, the wet end of the towing rope 9 is connected with the towing linear array 2, and the other end of the towing rope 9 penetrates through the second fixed pulley 11, the first fixed pulley 7 and the testing instrument to be connected with the force bearing supporting structure 13. The underwater array section dragging resistance is transferred to an air environment for measurement without loss by adopting a fixed pulley block structure, the problem that a tension testing device cannot be immersed in water is solved, and the real-time recording of the whole dragging process can be realized through the matching of recording equipment. The towing rope 9 is a neutral buoyancy and weak positive buoyancy towing rope to reduce the influence on the array section towing. The two ends of the rigid depth-fixing rod 6 are close to the second fixed pulley 11 and the first fixed pulley 7, and a second tow rope limit 12 and a first tow rope limit 8 are respectively arranged on the two ends of the rigid depth-fixing rod, the middle of the rigid depth-fixing rod 6 is connected with a protection rope 10, and the protection rope 10 is connected with the test ship 4 and the hull of the towing boat 5. The towing axis of the towing linear array 2 can be adjusted to a certain underwater depth by adjusting the rigid depth fixing rod 6, so that the whole process of the array section to be towed is below the water surface, and the problem that the array section floats on the water surface and drags the bottom due to the fact that the specific gravity of the equipment to be towed and the deviation of water are large is avoided. With the increase of the towing speed, the towing line array 2 leans against the axis towed to the fixed depth, and the condition that the array section or the towed body jumps out of the water surface cannot exist.
Example 1: as shown in fig. 1, the testing instrument is a standard tension meter 15, the bearing support structure 13 is a roller of a winch 3, and the winch 3 is installed on the test ship 4. In the installation scheme of the test ship 4, the winch 3 is connected with the towing rope 9 and the towing rope 9 is shortened at a certain speed. The speed of the winch 3 for shortening the towing rope 9 is the towing speed, the towing rope 9 on the test ship 4 adopts the standard tension meter 15 to monitor the towing tension in the whole process, the towing resistance of the towing line array 2 at different towing speeds can be obtained by deducting the flow resistance of the towing rope 9 in water, the installation range of the standard tension meter 15 is selected, and the precision is within 5% of the range.
Example 2: as shown in fig. 2: the testing instrument is a standard tension meter 14, and a bearing supporting structure 13 is fixed on the towing boat 5. In the installation scheme of the towed boat 5, a standard tension meter 14 is installed at the fixed positions of the towing rope 9 and the towed boat 5, the unpowered towed boat 5 is towed by a power system, the whole process of recording of the towing force data can be realized, and the towing resistance of the towed linear array 2 can be obtained by subtracting the flow resistance of the towing rope 9 with the length at different towing speeds because the underwater towing rope 9 is of a fixed length.
The working process of the invention is as follows:
1. and (3) arranging and laying the towed linear array 2 at a fixed depth: the method comprises the following steps of installing a testing device 1 on a test ship 4 or a towing boat 5 through a fixing structure 16, arranging a sleeved rigid fixed-depth rod 6 to a certain depth below the water surface according to the requirements of the scale and density of a towing line array 2, enabling a towing rope 9 to be threaded on the testing device 1, connecting the dry end of the towing rope 9 with a roller of a winch 3 or with a bearing support structure 13, additionally installing a standard tension meter 15 on the towing rope 9 in the former, additionally installing a standard tension meter 14 between the towing rope 9 and the bearing support structure 13 in the latter, connecting the wet end of the towing rope 9 with the testing towing line array 2, connecting a protection rope 10 with a ship body, realizing towing minimum depth limitation, and towing the testing line array to a certain offshore distance;
2. and (3) measuring the drag resistance: starting a winch 3 in an attached drawing 1 or a towing boat 5 in an attached drawing 2, swinging the rigid depth-fixing rod 6 by an angle in a towing reverse direction, ensuring that the tail end of the rigid depth-fixing rod 6 is not underwater by a certain depth through reverse tension of a protection rope 10, driving a towing line array 2 with neutral buoyancy to horizontally tow and advance underwater, transmitting flow resistance of a towing rope 9 and the flow resistance of the towing line array 2 through the towing rope 9, transmitting the flow resistance to a dry end of the towing rope 9 through a second fixed pulley 11 and a first fixed pulley 7, testing and recording tension of the towing rope 9 through a standard tension meter 14 or a standard tension meter 15, and acquiring towing flow resistance.
The invention can obtain the regular data of the drag flow resistance through tests, provide accurate parameters for theoretical measurement and calculation, provide basis for the specification of the towing cable of the drag system and the parameter design of the vibration reduction and isolation section, observe the whole process of array section dragging in real time, and provide test guidance for the state and the posture of the array section under the operations of stable dragging, variable speed dragging and the like.
It should be understood that equivalent substitutions and changes to the technical solution and the inventive concept of the present invention should be made by those skilled in the art to the protection scope of the appended claims.

Claims (7)

1. A device for depth measurement drag resistance is characterized in that: the device mainly comprises a testing instrument, a first fixed pulley (7), a second fixed pulley (11), a towing line array (2), a rigid depth-setting rod (6), a towing rope (9) and a fixing structure (16), wherein one end of the rigid depth-setting rod (6) is hinged with the fixing structure (16) so as to rotate for a certain angle around the fixing structure (16), the other end of the rigid depth-setting rod (6) is connected with a pulley seat of the second fixed pulley (11), and the pulley seat of the first fixed pulley (7) is fixedly connected to the fixing structure (16); rigidity depthkeeping pole (6) be certain angle and adorn below the surface of water downwards, resume horizontal installation after dragging rope (9) through setting up first fixed pulley (7), second fixed pulley (11) downward sloping at rigidity depthkeeping pole (6) both ends, drag rope (9) wet end and connect and drag linear array (2), the other end that drags rope (9) passes second fixed pulley (11), first fixed pulley (7), test instrument is connected with load bearing structure (13).
2. The device for depthkeeping testing drag resistance of claim 1, wherein: the testing instrument is a standard tension meter (15), the bearing supporting structure (13) is a roller of the winch (3), and the winch (3) is installed on the test ship (4).
3. The device for depthkeeping testing drag resistance of claim 1, wherein: the testing instrument is a standard tension meter (14), and the bearing supporting structure (13) is fixed on the towing boat (5).
4. The device for depthkeeping testing drag resistance of claim 1, wherein: the towing rope (9) adopts a neutral buoyancy towing rope and a weak positive buoyancy towing rope.
5. The device for depthkeeping testing drag resistance of claim 1, wherein: and a second dragging rope limit (12) and a first dragging rope limit (8) are respectively arranged at the positions, close to the second fixed pulley (11) and the first fixed pulley (7), of the two ends of the rigid depth fixing rod (6).
6. The device for depthkeeping testing drag resistance of claim 1, wherein: the middle part of the rigid depth fixing rod (6) is connected with a protection rope (10), and the protection rope (10) is connected with the ship body.
7. A measuring method adopting a device for testing drag resistance at a fixed depth is characterized in that: the method comprises the following specific steps:
(1) and the drag linear array (2) is arranged at a fixed depth: the method comprises the following steps that a testing device (1) is installed on a test ship (4) or a towing boat (5) through a fixing structure (16), a sleeved rigid depth rod (6) is arranged to a certain depth below the water surface according to the requirements of the scale and the density of a towing line array (2), a towing rope (9) is threaded on the testing device (1), the dry end of the towing rope (9) is connected with a roller of a winch (3) or connected with a bearing support structure (13), a standard tension meter (15) is additionally arranged on the towing rope (9), a standard tension meter (14) is additionally arranged between the towing rope (9) and the bearing support structure (13), the wet end of the towing rope (9) is connected with the testing towing line array (2), a protection rope (10) is connected with a ship body, and the testing towing line array is towed to a certain offshore distance;
(2) measuring drag resistance: the winch (3) is started or the boat (5) is towed, the rigid depth fixing rod (6) swings out an angle in the towing reverse direction, the tail end of the rigid depth fixing rod (11) is guaranteed to be not at a certain depth underwater through reverse tension of the protection rope (10), the towing linear array (2) with neutral buoyancy is driven to horizontally tow underwater to advance, the flow resistance of the towing rope (9), the flow resistance of the towing linear array (2) is transmitted through the towing rope (9), the second fixed pulley (11) and the first fixed pulley (7) are transmitted to the dry end of the towing rope (9), the tension of the towing rope (9) is tested and recorded through the standard tension meter (14) or the standard tension meter (15), and the towing flow resistance is obtained.
CN201910850572.1A 2019-09-10 2019-09-10 Device and method for testing drag resistance at fixed depth Pending CN110617941A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910850572.1A CN110617941A (en) 2019-09-10 2019-09-10 Device and method for testing drag resistance at fixed depth

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910850572.1A CN110617941A (en) 2019-09-10 2019-09-10 Device and method for testing drag resistance at fixed depth

Publications (1)

Publication Number Publication Date
CN110617941A true CN110617941A (en) 2019-12-27

Family

ID=68922956

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Application Number Title Priority Date Filing Date
CN201910850572.1A Pending CN110617941A (en) 2019-09-10 2019-09-10 Device and method for testing drag resistance at fixed depth

Country Status (1)

Country Link
CN (1) CN110617941A (en)

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