CN113514224B - Device and method for measuring hydrodynamic coefficient of high-voltage submarine cable - Google Patents
Device and method for measuring hydrodynamic coefficient of high-voltage submarine cable Download PDFInfo
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- CN113514224B CN113514224B CN202110579488.8A CN202110579488A CN113514224B CN 113514224 B CN113514224 B CN 113514224B CN 202110579488 A CN202110579488 A CN 202110579488A CN 113514224 B CN113514224 B CN 113514224B
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Abstract
The invention belongs to the field of ocean engineering, and particularly relates to a device for measuring hydrodynamic coefficient of a high-voltage submarine cable and a measuring method thereof. The invention solves the problems of low precision, inaccuracy, high cost and the like of hydrodynamic coefficient search according to a manual and an empirical formula in the traditional measurement mode, and establishes the submarine cable hydrodynamic coefficient measuring device.
Description
Technical Field
The invention belongs to the field of ocean engineering, and particularly relates to a device and a method for measuring hydrodynamic coefficient of a high-voltage submarine cable.
Background
With the increasing demand of our country for new energy, the development of offshore wind power in our country gradually moves from shallow water to deep water. Wind power is becoming more and more a clean energy source for the important development of all countries in the world because of its advantages of no pollution, sustainable development, easy availability and the like.
Submarine cables are used as key structures of offshore wind power systems, and are extremely important to control and operation of lowering and laying processes of the submarine cables. The motion response and the dynamic response of the submarine cable in the lowering process need to be predicted, the hydrodynamic force borne by the submarine cable is analyzed and calculated, and the load borne by the lowered cable is accurately calculated, so that the range of applicable ships is expanded, and the operation safety coefficient is improved.
The current measurement of hydrodynamic coefficients (damping coefficient, additional mass coefficient) has several problems: (1) At present, the resistance coefficient of the submarine cable is obtained by DNV manual or related empirical formula estimation, and the resistance coefficient of the cable is accurately obtained by a systematic research and measurement method. (2) The current measurement of the additional mass coefficient is usually measured and calculated by taking an extreme point that the oscillation speed of the cable is zero, because the flow resistance tends to be zero at the moment, but the flow resistance usually exists in practical situations, so that the test process cannot truly simulate the actual oscillation process. Therefore, it is necessary to develop an accurate and efficient device for measuring hydrodynamic coefficient of submarine cable.
Disclosure of Invention
In order to make up the defects of the prior art, the invention provides a device and a method for measuring the hydrodynamic coefficient of a high-voltage submarine cable.
The hydrodynamic coefficient measuring device for the high-voltage submarine cable is characterized by comprising
The hanging component comprises a first hanging rope and is used for hanging the test piece;
the forced vibration driving assembly is connected with the first hanging rope in a matching way, is connected with the test piece through the first hanging rope and is used for driving the test piece to move in the vertical direction;
the linear displacement sensor is used for acquiring displacement data of a test piece; and
the tensile force sensor is used for acquiring hydrodynamic force applied to the test piece.
The device for measuring the hydrodynamic coefficient of the high-voltage submarine cable is characterized in that the tension sensor comprises a first tension sensor, the hanging assembly further comprises a plurality of second hanging ropes, the first hanging ropes are used for being connected with the first tension sensor in a matched mode, the first tension sensor is used for being connected with the second hanging ropes in a matched mode, and the second hanging ropes are used for hanging a test piece.
The hydrodynamic coefficient measuring device for the high-voltage submarine cable is characterized in that the first hanging rope of the hanging assembly is connected with the first tension sensor in a matched mode through the arranged first buffer spring.
The hydrodynamic coefficient measuring device for the high-voltage submarine cable is characterized by further comprising a mooring component, wherein the mooring component comprises a first mooring rope, a plurality of second mooring ropes and a second buffer spring, one end of the first mooring rope is used for mooring, the other end of the first mooring rope is used for being connected with the second buffer spring in a matched mode, the second buffer spring is used for being connected with the second mooring ropes in a matched mode, and the second mooring ropes are used for being connected with a test piece in a matched mode.
The hydrodynamic coefficient measuring device for the high-voltage submarine cable is characterized in that the tension sensor comprises a second tension sensor, and the second buffer spring is connected with the second mooring ropes in a matched mode through the second tension sensor.
The hydrodynamic coefficient measuring device for the high-voltage submarine cable is characterized in that the linear displacement sensor is connected with the test piece through an extension line.
The hydrodynamic coefficient measuring device for the high-voltage submarine cable is characterized in that the forced vibration driving assembly comprises a winding drum used for winding the first hanging rope and a motor used for driving the winding drum to rotate, and the motor can rotate positively and negatively.
The method for measuring the hydrodynamic coefficient of the high-voltage submarine cable is characterized by comprising the following steps
The method comprises the following steps: the forced vibration driving assembly drives the test piece to make incident flow motion with a fixed value in the vertical direction, the total resistance force applied to the test piece in the vertical direction is collected through the tension sensor, the incident flow area of the test piece in the vertical direction is measured and obtained according to the prototype size of the test piece, and the resistance coefficient of the test piece in the vertical direction is calculated through a Morrison formula;
step two: the test piece is driven to do sinusoidal oscillation motion in the vertical direction through the forced vibration driving assembly, displacement data of the test piece are collected through the linear displacement sensor, acceleration of the test piece in the vertical direction is obtained through second-order derivation of a displacement curve, total resistance of the test piece at different moments is collected through the tension sensor in real time, and an inertia force coefficient and an additional mass coefficient are calculated by combining a Morrison equation.
One heightThe method for measuring the hydrodynamic coefficient of the submarine cable is characterized by comprising the following specific measurement processes in the first step: the test piece is driven by the forced vibration driving component to have a constant value V in the vertical direction r Making a head-on motion, and acquiring the total resistance F borne by the test piece in the vertical direction through a tension sensor D Measuring and acquiring the incident flow area A of the test piece in the vertical direction according to the prototype size of the test piece p Drag force term F by Morrison's formula D ＝0.5ρC D A p v r 2 Calculating to obtain the resistance coefficient C of the test piece in the vertical direction D Where ρ is the fluid density.
The method for measuring the hydrodynamic coefficient of the high-voltage submarine cable is characterized by comprising the following specific measurement processes of the step two: the test piece is driven by the forced vibration driving component to make a velocity v in the vertical direction r The method comprises the following steps of (1) sinusoidal oscillation motion of = Asin ω t, wherein A is the motion velocity amplitude of a cable sample, ω is oscillation angular frequency, displacement data of a test piece are collected through a linear displacement sensor, and acceleration a of the test piece in the vertical direction is obtained through second-order derivation of a displacement curve r Acquiring total resistance F of the test piece at different moments t in real time through a tension sensor in a mode of = A omega cos ω t Zt Then according to the Morrison equation
The coefficient of inertia force can be calculated as
Based on the additional mass coefficient C m ＝C M -1 calculating C m Numerical values wherein
V 0 Is the volume of the test piece (2).
Compared with the prior art, the invention has the advantages that:
the invention solves the problems of low precision, inaccuracy, high cost and the like of hydrodynamic coefficient search according to a manual and an empirical formula in the traditional measurement mode, and establishes the submarine cable hydrodynamic coefficient measuring device. On the basis of ensuring high accuracy of the test result, the test efficiency is improved, the test cost is reduced, and the resistance coefficient and the additional mass coefficient under different speeds can be obtained. Motion laws such as motion response, dynamic response and the like in the process of lowering and installing the underwater structure are accurately predicted and simulated, and safe and accurate installation and lowering of the underwater submarine cable are realized. The efficiency and the safety factor of deep-water offshore operation are improved, and the operation cost and the risk are reduced.
Drawings
Fig. 1 is a schematic structural diagram of a hydrodynamic coefficient measuring device for a high-voltage submarine cable according to the present invention;
fig. 2 is a schematic structural diagram of a forced vibration driving assembly in the hydrodynamic coefficient measuring device for the high-voltage submarine cable according to the present invention;
fig. 3 is a flow chart of a method for measuring hydrodynamic coefficient of a high-voltage submarine cable according to the present invention.
Detailed Description
In the description of the present invention, it is to be understood that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "central", "end", "length", "outer end", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
The invention will be further explained with reference to the drawings.
As shown in fig. 1 and 2, a hydrodynamic coefficient measuring device for high-voltage submarine cable comprises
The hanging component comprises a first hanging rope 1 and is used for hanging the test piece 2;
one end of the mooring component is connected with the test piece 2, and the other end of the mooring component is moored on a fixed object in the test pool;
the forced vibration driving assembly 3 is connected with the first hanging rope 1 in a matched mode, is connected with the test piece 2 through the first hanging rope 1 and is used for driving the test piece 2 to move in the vertical direction;
the linear displacement sensor 4 is used for acquiring displacement data of the test piece 2; and
the tension sensor is used for acquiring hydrodynamic force borne by the test piece 2 in the hydrodynamic process, and comprises non-inertial force of uniform motion, drag force and flow resistance, inertial force in the oscillation process and additional mass force.
As an optimization: the tension sensor comprises a first tension sensor 5, the hanging assembly further comprises a plurality of second hanging ropes 6, the first hanging ropes 1 are used for being connected with the first tension sensor 5 in a matched mode, the first tension sensor 5 is used for being connected with the second hanging ropes 6 in a matched mode, and the second hanging ropes 6 are used for hanging the test piece 2. The hanging assembly further comprises a first buffer spring 7, and two ends of the first buffer spring 7 are respectively used for being connected with the first hanging rope 1 and the first tension sensor 5 in a matched mode. The second hanging ropes 6 are symmetrically tied around the test piece 2, so that the test piece 2 only has one degree of freedom in the vertical direction and cannot rotate, and the tension sensor and the linear displacement sensor 4 are enabled to measure only motion parameters in the vertical direction.
As an optimization: the measuring device further comprises a mooring component, wherein the mooring component comprises a first mooring rope 9, a plurality of second mooring ropes 10 and second buffer springs 11, one end of the first mooring rope 9 is used for mooring with a fixed object of a test water tank, the other end of the first mooring rope is used for being matched and connected with the second buffer springs 11, the second buffer springs 11 are used for being matched and connected with the plurality of second mooring ropes 10, and the plurality of second mooring ropes 10 are used for being matched and connected with the test piece 2.
Further, the tension sensor comprises a second tension sensor 8, and the second buffer spring 11 is connected with the second mooring ropes 10 through the second tension sensor 8 in a matching manner.
In the above structure, the second mooring ropes 10 are symmetrically tied around the test piece 2, and also ensure that the test piece 2 has only one degree of freedom in the vertical direction and cannot rotate, thereby ensuring that the tension sensor and the linear displacement sensor 4 only measure the motion parameters in the vertical direction. When the test piece 2 is sufficiently heavy, the mooring component may not be installed.
As an optimization: the linear displacement sensor 4 is connected to the test piece 2 via an extension 12.
In the above configuration, when in use, the wire displacement sensor 4 is given a certain initial value so that the extension wire 12 is completely straightened. In addition, when the moving distance of the test piece 2 is short, the induction head of the linear displacement sensor 4 can be directly fixed on the test piece for displacement measurement.
As an optimization: the forced vibration driving assembly 3 comprises a winding drum 300 for winding the first hanging rope 1 and a motor 301 for driving the winding drum 300 to rotate, wherein the motor 301 can rotate forward and backward. A reduction gearbox 302 and a clutch 303. The forced vibration driving assembly 3 further comprises a reduction gearbox 302 and a clutch 303, one end of the reduction gearbox 302 is in transmission fit with an output shaft of the motor 300, the other end of the reduction gearbox 302 is in fit connection with the clutch 303, and the clutch 303 is in fit connection with the winding drum 300. The motor 300 is a servo motor.
In addition, the invention is also provided with a control box and a data acquisition system, when in use, a motion function of the test piece 2 oscillation is set, the control box is utilized to send the motion rule to the motor 301 in the form of pulse signals, and the rotating speed and acceleration of the motor 301 can be controlled by controlling the pulse frequency, thereby achieving the purposes of positioning and speed regulation. The data acquisition system is mainly responsible for acquiring and storing all experimental data.
As shown in fig. 3, a method for measuring hydrodynamic coefficient of high voltage submarine cable comprises
The method comprises the following steps: the forced vibration driving component 3 drives the test piece 2 to make a head-on motion with a certain value in the vertical direction in the test pool, the total resistance force applied in the vertical direction of the test piece 2 is collected through the tension sensor, the head-on area of the test piece 2 in the vertical direction is measured and obtained according to the prototype size of the test piece 2, and the resistance coefficient of the test piece 2 in the vertical direction is calculated through the Morrison formula;
step two: the test piece 2 is driven to do sinusoidal oscillation motion in the vertical direction through the forced vibration driving component 3, displacement data of the test piece 2 are collected through the linear displacement sensor 4, acceleration of the test piece 2 in the vertical direction is obtained through second-order derivation of a displacement curve, total resistance of the test piece 2 at different moments is collected through the tension sensor in real time, and an inertia force coefficient and an additional mass coefficient are calculated by combining a Morison equation.
As an optimization: the specific measurement process of the first step is as follows: the test piece 2 is driven by the forced vibration driving component to be at a constant value V in the vertical direction r Making a head-on motion, and acquiring the total resistance F borne by the test piece 2 in the vertical direction through a tension sensor D Measuring and acquiring the incident flow area A of the test piece 2 in the vertical direction according to the prototype size of the test piece 2 p Drag force term F by Morrison's formula D ＝0.5ρC D A p v r 2 The resistance coefficient C of the test piece 2 in the vertical direction is calculated D Where ρ is the fluid density.
And (2) performing a specific measurement process of the step two: the test equipment is sequentially connected in place, the water surface is guaranteed to be static and not fluctuated, the linear displacement sensor 4 is connected with the surface of the test piece 2 according to requirements, and the tension sensor is installed in the vertical direction. Connecting and hanging the test piece 2 in the middle of two tension sensors, adjusting the orientation and posture of the test piece 2 through second hanging ropes 6 which are symmetrically distributed, fixing the test piece 2 to keep the test piece still, adjusting the height of the bottom of the test piece 2 from the water surface, ensuring the bottom of the test piece 2 to be parallel to the water surface as much as possible, and finally opening a data acquisition system to initialize and set acquisition frequency; then, the test piece 2 is lifted to a specified position along the vertical direction, and then the forced vibration driving component 3 drives the test piece 2 to make a speed V in the vertical direction r The method comprises the following steps of (1) sinusoidal oscillation motion of = Asin ω t, wherein A is the motion velocity amplitude of a cable sample, ω is oscillation angular frequency, displacement data of a test piece 2 are collected through a linear displacement sensor 4, and second-order derivation is carried out on a displacement curve to obtain the vertical direction of the test piece 2Acceleration of a r The method is characterized in that = A ω cos ω t, and the total resistance F borne by the test piece 2 at different moments t is acquired in real time through a tension sensor Zt Then according to the Morrison equation
The coefficient of inertia force can be calculated as
Based on the additional mass coefficient C m ＝C M -1 calculating C m Numerical values wherein
V 0 The volume of test piece 2.
According to the above measurement method, further: additional mass m' = C of test piece 2 in vertical direction m ρV 0 。
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A hydrodynamic coefficient measuring device for high-voltage submarine cables is characterized by comprising
The device comprises a hanging assembly, a testing assembly and a control assembly, wherein the hanging assembly comprises a first hanging rope (1) and a plurality of second hanging ropes (6), and is used for hanging a test piece (2);
the forced vibration driving assembly (3) is connected with the first hanging rope (1) in a matched mode, is connected with the test piece (2) through the first hanging rope (1) and is used for driving the test piece (2) to move in the vertical direction;
the linear displacement sensor (4), the linear displacement sensor (4) is used for collecting displacement data of the test piece (2);
the mooring component comprises a first mooring rope (9), a plurality of second mooring ropes (10) and second buffer springs (11), one end of the first mooring rope (9) is used for mooring, the other end of the first mooring rope is used for being matched and connected with the second buffer springs (11), the second buffer springs (11) are used for being matched and connected with the plurality of second mooring ropes (10), and the plurality of second mooring ropes (10) are used for being matched and connected with the test piece (2); and
the tension sensor is used for acquiring hydrodynamic force borne by a test piece (2), the tension sensor comprises a first tension sensor (5) and a second tension sensor (8), a first lifting rope (1) is connected with the first tension sensor (5) in a matched mode through a first buffer spring (7) which is arranged, the first tension sensor (5) is used for being connected with a plurality of second lifting ropes (6) in a matched mode, the second lifting ropes (6) are used for lifting the test piece (2), and a second buffer spring (11) is connected with a plurality of second mooring ropes (10) in a matched mode through the second tension sensor (8).
2. The device for hydrodynamic coefficient measurement of high voltage submarine cables according to claim 1, wherein the linear displacement sensor (4) is connected to the test piece (2) by means of an extension wire (12).
3. The device for measuring the hydrodynamic coefficient of high voltage submarine cable according to claim 1, wherein the forced vibration driving assembly (3) comprises a winding drum (300) for winding the first suspension rope (1) and a motor (301) for driving the winding drum (300) to rotate, and the motor (301) can rotate in forward and reverse directions.
4. A method of measuring a hydrodynamic coefficient of a high voltage submarine cable according to any of claims 1 to 3, comprising
The method comprises the following steps: the forced vibration driving assembly (3) drives the test piece (2) to make incident flow motion with a fixed value in the vertical direction, the total resistance force applied to the test piece (2) in the vertical direction is collected through the tension sensor, the incident flow area of the test piece (2) in the vertical direction is measured and obtained according to the prototype size of the test piece (2), and the resistance coefficient of the test piece (2) in the vertical direction is calculated through a Morrison formula;
step two: the test piece (2) is driven to do sinusoidal oscillation motion in the vertical direction through the forced vibration driving assembly (3), displacement data of the test piece (2) are collected through the linear displacement sensor (4), acceleration of the test piece (2) in the vertical direction is obtained through second-order derivation of a displacement curve, total resistance of the test piece (2) at different moments is collected through the tension sensor in real time, and an inertia force coefficient and an additional mass coefficient are calculated by combining a Morison equation.
5. The method according to claim 4, wherein the step one comprises a specific measurement procedure of: the test piece (2) is driven by the forced vibration driving component to have a constant value v in the vertical direction r The total resistance F applied to the vertical direction of the test piece (2) is acquired by a tension sensor in the way of head-on motion D Measuring and acquiring the incident flow area A of the test piece (2) in the vertical direction according to the prototype size of the test piece (2) p Drag force term F by Morrison's formula D ＝0.5ρC D A p v r 2 The resistance coefficient C of the test piece (2) in the vertical direction is obtained through calculation D Where ρ is the fluid density.
6. The method as claimed in claim 5, wherein the step two comprises the following steps: the test piece (2) is driven to make a velocity v in the vertical direction by the forced vibration driving component (3) r The method comprises the following steps of = Asin ω t sinusoidal oscillation motion, wherein A is the motion velocity amplitude of a cable sample, ω is oscillation angular frequency, displacement data of a test piece (2) are collected through a linear displacement sensor (4), and acceleration a of the test piece (2) in the vertical direction is obtained through second-order derivation of a displacement curve r The method is characterized in that the total resistance of a test piece (2) at different moments t is acquired in real time through a tension sensor in a mode of = A omega cos ω tForce F Zt Then according to the Morrison equation
The inertia force coefficient can be calculated to be
Based on the additional mass coefficient C m ＝C M -1 calculating C m Values of, wherein the characteristic dimension
V 0 Is the volume of the test piece (2).
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| CN114323554A (en) * | 2021-11-23 | 2022-04-12 | 国核电力规划设计研究院有限公司 | Submarine suspended cable wave-induced oscillation monitoring test device and monitoring method |
| CN114818539B (en) * | 2022-04-29 | 2022-12-23 | 山东大学 | Underwater structure viscous drag resistance prediction method and system based on exponential function |
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