CN114323554A - Submarine suspended cable wave-induced oscillation monitoring test device and monitoring method - Google Patents
Submarine suspended cable wave-induced oscillation monitoring test device and monitoring method Download PDFInfo
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Abstract
The application discloses a submarine suspended cable wave-induced oscillation monitoring test device and a monitoring method. Wherein, the device includes: a glass water tank and a steel frame; wave making plate; a control device; a reflected wave absorbing means; a wave height instrument and a wave element signal receiving device; strain gauges and signal collectors. Through the technical scheme of this application, can realize the monitoring test to seabed suspended cable wave induced oscillation to avoid among the seabed suspended cable engineering because of the engineering accident that the design is improper causes, have guiding significance to seabed suspended cable's design and application.
Description
Technical Field
The application relates to the field of power engineering, in particular to a submarine suspended cable wave-induced oscillation monitoring test device and a monitoring method.
Background
In the submarine suspended cable engineering, when the natural vibration frequency of the adopted cable is close to or the same as the wave-induced oscillation frequency of the submarine suspended cable under the action of waves, the frequency of the submarine suspended cable is locked under the influence of the waves, and further the submarine suspended cable is damaged, so that engineering accidents are caused. However, in the related art, a specific implementation method for a wave-induced oscillation monitoring test of a submarine suspended cable is not yet common.
Disclosure of Invention
The application provides a submarine suspended cable wave-induced oscillation monitoring test device and a monitoring method, which can realize the monitoring test of submarine suspended cable wave-induced oscillation, thereby avoiding engineering accidents caused by improper design in submarine suspended cable engineering and having guiding significance for the design and application of submarine suspended cables.
In a first aspect, the present application provides a submarine suspended cable wave-induced oscillation monitoring test device, including: the glass water tank is arranged on a flat ground of a test room, the steel frame is positioned in the glass water tank and embedded on the flat ground of the test room, and waterproof materials are arranged on the inner wall surface of the glass water tank and the contact surface of the glass water tank and the steel frame; a wave generating plate mounted on the front end of the glass water tank; the control device is connected with the wave making plate and is used for controlling the wave making plate to make waves in the glass water tank according to wave element parameters; the reflected wave absorption device is arranged at the rear end of the glass water tank and is used for carrying out wave elimination treatment on waves at the rear end of the glass water tank; the wave height instrument is erected at a test section of the glass water tank and is connected with the wave element signal receiving device and used for measuring the change process of waves along with time during the wave passes through the test section; the device comprises a strain gauge and a signal collector, wherein the strain gauge is arranged at the central part of the submarine cable model for the test, the strain gauge is connected with the signal collector through a double Wheatstone bridge, and the strain gauge and the signal collector are used for measuring strain information data of the submarine cable model for the test under the action of waves.
According to the wave-induced oscillation monitoring test device for the submarine suspended cable, the wave-induced oscillation monitoring test for the submarine suspended cable can be realized, so that engineering accidents caused by improper design in submarine suspended cable engineering are avoided, and the wave-induced oscillation monitoring test device has guiding significance for the design and application of the submarine suspended cable.
In one implementation, the reflected wave absorbing device is formed by stacking block-shaped void structures in a slope manner; the gradient of the slope is 1: 5-1: 10.
In an alternative implementation, the ramp is stacked with the bulk void structures stacked one on top of the other, the height of the stack exceeding the height of the glass flume, and a ballast is placed on top of the ramp to prevent the bulk void structures from floating in the water during the test.
In an optional implementation mode, the blocky void structures are dry straw bundled into blocks, and the relative density is 0.3-0.5.
In one implementation mode, the wave height meters are multiple and are respectively erected at the front end, the middle part, the rear end of the test section and a position away from the rear end by a preset length.
In an optional implementation manner, the test submarine cable model is erected at the middle end of the test section, and the wave height instrument erected at the middle of the test section is opposite to the test submarine cable model below the test submarine cable model.
In one implementation, the apparatus further comprises: and the processing device is used for acquiring wave element information data of different parts recorded by the wave element signal receiving device, acquiring middle section strain information data of the submarine cable model for test recorded by the signal collector, and determining a mathematical relation between the wave-induced oscillation frequency of the submarine cable model for test and the influence factors according to the wave element information data of different parts and the middle section strain information data of the submarine cable model for test.
In a second aspect, the present application provides a method for monitoring waviness of a submarine suspended cable, using the device for monitoring waviness of a submarine suspended cable according to the first aspect, the method including: when the test is started, the suspended span and the suspended height parameters of the test submarine cable model are adjusted by adjusting the steel frame arranged in the glass water tank according to the suspended span and the suspended height parameters of the actual submarine cable; controlling the wave making plate to move and make waves according to wave element parameters by the control device according to the wave conditions for the test, and forming the wave conditions for the test in the glass water tank; when waves are transmitted and pass through the test section, the wave height meters at all positions transmit wave element information to the wave element signal receiving device, and the test device and the process are adjusted so that the wave element information measured by all the wave height meters meets test conditions; when waves pass through the submarine cable model for the test, wave element information data of different parts are recorded through the wave height instrument and the wave element signal receiving device, and strain information data of the submarine cable model for the test under the action of the waves are measured through the strain gauge and the signal collector.
In one implementation, the method further comprises: acquiring wave element information data of different parts recorded by the wave element signal receiving device; acquiring strain information data of the middle section of the submarine cable model for the test, which is recorded by the signal collector; and determining a mathematical relation between the wave-induced oscillation frequency of the submarine cable model for the test and the influence factors according to the wave element information data of different parts and the middle section strain information data of the submarine cable model for the test.
Through the technical scheme, the relation between the wave-induced oscillation frequency of the submarine suspended cable and the influence factors can be obtained, so that the wave-induced oscillation of the submarine suspended cable can be quickly predicted, and whether the operation is safe or not can be quickly and efficiently judged.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present application, nor do they limit the scope of the present application. Other features of the present application will become apparent from the following description.
Drawings
The drawings are included to provide a better understanding of the present solution and are not intended to limit the present application. Wherein:
fig. 1 is a flowchart of a method for monitoring wave-induced oscillation of a submarine suspended cable according to an embodiment of the present application.
Detailed Description
The following description of the exemplary embodiments of the present application, taken in conjunction with the accompanying drawings, includes various details of the embodiments of the application for the understanding of the same, which are to be considered exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
Where in the description of the present application, "/" indicates an OR meaning, for example, A/B may indicate A or B; "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone.
The invention provides a submarine suspended cable wave-induced oscillation monitoring test device, which comprises: glass water tank and steel frame. The glass water tank is arranged on a flat ground of a test room, the steel frame is positioned in the glass water tank and embedded on the flat ground of the test room, and waterproof materials are arranged on the surface of the inner wall of the glass water tank and the contact surface of the glass water tank and the steel frame.
For example, a cement surface layer with the length of 85m, the height of 0.2m and the width of 1.0m can be poured on the ground in a test room, and a waterproof layer is coated on the surface of the cement surface layer. And (3) embedding steel frames at equal intervals along the side wall of the cement surface layer tightly attached to the cement surface layer, wherein the embedding depth is 1/3 of the height of the steel frames, and the interval between the frames is 1.5 m. Glass is arranged in the steel frames and between the steel frames on two sides close to the cement surface layer, the size of each piece of glass is 1.5m multiplied by 1.5m, and waterproof glue is smeared between the glass and the steel frames and between the glass and the cement surface layer to seal each contact surface. Thus, a glass water tank having a length of 85m, a width of 1.0m and a height of 1.5m was formed.
In this application embodiment, this submarine suspended cable wave causes vibration monitoring test device can also include: wave making board and controlling means. Wherein the wave making plate is carried at the front end of the glass water tank; the control device is connected with the wave making plate and is used for controlling the wave making plate to make waves in the glass water tank according to the wave element parameters.
For example, the control device may comprise a motor and a computer connected to the motor, the motor being connected to the wave making plate. The motor can respond to wave-making parameters (such as wave height, wave length, wave steepness, period, wave speed and the like) input by the computer and drive the wave-making plate to generate corresponding waves. As an example, the dimension of the wave-making plate may be 1.5m long by 1m wide, and the material may be wood.
In this application embodiment, this submarine suspended cable wave causes vibration monitoring test device can also include: and a reflected wave absorbing means. The reflected wave absorption device is arranged at the rear end of the glass water tank and is used for carrying out wave elimination treatment on waves at the rear end of the glass water tank.
In one implementation, the reflected wave absorbing means is formed by stacking block-shaped void structures in a sloping manner; the gradient of the slope is 1: 5-1: 10.
In an alternative implementation, the ramps are stacked with the bulk void structures stacked one on top of the other, the height of the stack exceeding the height of the glass flume, and a compactor is placed on top of the ramp to prevent the bulk void structures from floating in the water during the test.
In an optional implementation mode, the blocky void structures are dry straws bundled into blocks, and the relative density is 0.3-0.5.
The reflected wave absorption device is used for absorbing reflected waves formed after the reflected waves are reflected by the rear end of the glass water tank, so that the interference of the reflected waves on data collected by the test device is reduced.
For example, straw with a forked leaf larger than 5 can be selected, the forked leaf part of the branch part of the straw stem with the length of more than 2cm is cut, the straw is dried, laid and compacted along the direction of the forked leaf, and is bundled along the transverse direction and the vertical direction, so that a cuboid with the relative density of 0.3-0.5, the length of 0.3m, the width of 0.3m and the height of 0.3m is formed, and the cuboid is used as a reflected wave absorption device. It should be noted that when the wetted surface of the reflected wave absorbing device manufactured by the above method is 0.3m higher than the water surface of the glass water tank in a static state, the wetted surface needs to be replaced to ensure that the wave absorbing capacity meets the test requirements.
In this application embodiment, this submarine suspended cable wave causes oscillation monitoring test device still includes: a wave height instrument and a wave element signal receiving device. The wave height instrument is erected at the test section of the glass water tank and connected with the wave element signal receiving device and used for measuring the change process of waves along with time when the waves pass through the test section.
The test section is an area which takes the rear section 2/3 of the glass water tank as a center and has the length of 1/10 of the total length of the glass water tank, and the wave height instrument is used for monitoring incident waves and reflected waves in the test device to ensure the accuracy of test results.
In one implementation, the wave height meters are multiple, and the multiple wave height meters are erected at the front end, the middle part, the rear end of the test section and at a preset length from the rear end, and as an example, the preset length may be 5 m.
The data collected by the wave height meter arranged at the front end of the test section represents wave elements of incident waves generated by the wave making plate, the collected wave elements of the incident waves need to be compared with preset wave elements of the wave making plate control device in the test, the difference value of the errors of the collected wave elements and the preset wave elements is required to be smaller than a preset first threshold, when the error of the collected wave elements and the preset wave elements is larger than the first threshold, the wave making plate and the control device need to be adjusted, and as an example, the first threshold can be 3%; after the data are collected by the wave height instruments arranged at the rear end of the test section and at a preset length away from the rear end of the test section, the data collected by the two wave height instruments are compared to obtain reflected wave data, and the reflected wave data represents wave elements of the reflected waves which are still remained after incident waves are reflected by the rear end of the water tank and absorbed by the reflected wave absorbing device. In the test, the obtained reflected wave data and incident wave data need to be compared, the ratio of the reflected wave data to the incident wave data is determined, and the ratio is compared with a second threshold value preset by the system. When the ratio is greater than the second threshold, which may be 5% as an example, it indicates that the reflected wave is too large and the reflected wave absorbing means needs to be adjusted.
In an optional implementation manner, the test submarine cable model is erected at the middle end of the test section, and the wave height instrument erected in the middle of the test section is opposite to the test submarine cable model below the wave height instrument.
In one implementation mode of the method, a reasonable test scale can be selected according to parameters including but not limited to the depth of water in the sea area where the engineering is located, the physical characteristics of the cable and the like in the actual submarine suspended cable engineering; and converting the hydrodynamic physical prototype parameters of the sea area where the submarine suspended cable engineering is located and the physical prototype parameters of the submarine suspended cable into parameters for testing by using a similar theory, and manufacturing a submarine cable model for testing according to the selected test scale.
This submarine suspended cable wave causes vibration monitoring test device still includes: the device comprises a strain gauge and a signal collector, wherein the strain gauge is arranged at the central part of the submarine cable model for the test and is connected with the signal collector through a double Wheatstone bridge, and the strain gauge and the signal collector are used for measuring strain information data of the submarine cable model for the test under the action of waves.
The strain gauge is required to be capable of collecting high-frequency data of 200 Hz-1000 Hz so as to ensure the coverage range of collected data, and the diameter of a wire used for connecting the strain gauge and the signal collector is less than 2% of the outer diameter of a cable in the submarine cable model for testing so as to avoid influencing the test data.
For example, the plurality of strain gauges may be attached to a plurality of symmetrical positions on the central portion of the submarine cable model for testing by using sealing glue, so as to ensure that the strain gauges are not affected by water flow and data can be comprehensively acquired.
In some embodiments of the present application, the submarine flying cable wave-induced oscillation monitoring test device further includes: and a processing device. The processing device is used for acquiring wave element information data of different parts recorded by the wave element signal receiving device, acquiring middle strain information data of the submarine cable model for test recorded by the signal collector, and determining a mathematical relation between the wave-induced oscillation frequency of the submarine cable model for test and the influence factors according to the wave element information data of different parts and the middle strain information data of the submarine cable model for test.
Through the device, the monitoring test of the wave-induced oscillation of the submarine suspended cable can be realized, so that the engineering accident caused by improper design in the submarine suspended cable engineering is avoided, and the device has guiding significance for the design and application of the submarine suspended cable.
Referring to fig. 1, fig. 1 is a view of a method for monitoring wave-induced oscillation of a submarine suspended cable according to an embodiment of the present application, where the method uses a submarine suspended cable wave-induced oscillation monitoring test apparatus according to an embodiment of the present application, and the method may include the following steps.
And S101, when the test is started, adjusting the suspended span and the suspended height parameter of the submarine cable model for the test by adjusting a steel frame arranged in a glass water tank according to the suspended span and the suspended height parameter of the actual submarine cable.
And S102, controlling the wave making plate to move and make waves according to the wave element parameters by the control device according to the wave conditions for the test, and forming the wave conditions for the test in the glass water tank.
And step S103, when the waves propagate and pass through the test section, the wave height meters at all positions transmit the wave element information to the wave element signal receiving device, and the test device and the process are adjusted so that the wave element information measured by all the wave height meters meets the test conditions.
And step S104, when the waves pass through the submarine cable model for the test, recording wave element information data of different parts through a wave height instrument and a wave element signal receiving device, and measuring strain information data of the submarine cable model for the test under the action of the waves through a strain gauge and a signal collector.
In one implementation, the method for monitoring wave-induced oscillation of a submarine suspended cable further comprises: acquiring wave element information data of different parts recorded by a wave element signal receiving device; acquiring test submarine cable model middle section strain information data recorded by a signal collector; and determining a mathematical relation between the wave-induced oscillation frequency of the submarine cable model for the test and the influence factors according to the wave element information data of different parts and the middle section strain information data of the submarine cable model for the test.
For example, the wave element information data of different positions recorded by the wave element signal receiving device and the submarine cable midship strain information data recorded by the strain signal receiver are extracted. And carrying out Fourier analysis on the strain information data, and extracting the main frequency of 1-2 orders, thereby obtaining the wave-induced oscillation frequency analysis result of the submarine suspended cable corresponding to the characteristics of the submarine suspended cable under the action of waves.
The state characteristics (such as the suspension height of the submarine cable, the suspension length of the submarine cable, the physical parameters of the submarine cable and the like) of the submarine suspended cable in non-dimensionalization and the wave element characteristics in non-dimensionalization are taken as independent variable coordinates, the vibration frequency of the submarine suspended cable is taken as dependent variable coordinates, a multi-axis point data graph is drawn, and curve fitting is carried out by adopting the following formula.
Wherein, l is the suspended span length of the submarine suspended cable, D is the outer diameter of the submarine suspended cable, e is the suspended height of the submarine suspended cable, HwIs the wave height of the incident wave, d is the depth of water in the water tank, TwAlpha, beta, gamma, delta and epsilon are preset coefficients of the system. Thereby obtaining the relation between the wave-induced oscillation frequency of the submarine suspended cable and the influence factors.
By implementing the embodiment of the application, the relation between the wave-induced oscillation frequency of the submarine suspended cable and the influence factors can be obtained, so that the wave-induced oscillation of the submarine suspended cable can be quickly predicted, and whether the operation is safe or not can be quickly and efficiently judged.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present disclosure may be executed in parallel, sequentially, or in different orders, as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved, and the present disclosure is not limited herein.
The above-described embodiments should not be construed as limiting the scope of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. The utility model provides a submarine suspended cable wave causes oscillation monitoring test device which characterized in that includes:
the glass water tank is arranged on a flat ground of a test room, the steel frame is positioned in the glass water tank and embedded on the flat ground of the test room, and waterproof materials are arranged on the inner wall surface of the glass water tank and the contact surface of the glass water tank and the steel frame;
a wave generating plate mounted on the front end of the glass water tank;
the control device is connected with the wave making plate and is used for controlling the wave making plate to make waves in the glass water tank according to wave element parameters;
the reflected wave absorption device is arranged at the rear end of the glass water tank and is used for carrying out wave elimination treatment on waves at the rear end of the glass water tank;
the wave height instrument is erected at a test section of the glass water tank and is connected with the wave element signal receiving device and used for measuring the change process of waves along with time during the wave passes through the test section;
the device comprises a strain gauge and a signal collector, wherein the strain gauge is arranged at the central part of the submarine cable model for the test, the strain gauge is connected with the signal collector through a double Wheatstone bridge, and the strain gauge and the signal collector are used for measuring strain information data of the submarine cable model for the test under the action of waves.
2. The apparatus according to claim 1, wherein the reflected wave absorbing means is formed by stacking block-shaped void structures in a sloping manner; the gradient of the slope is 1: 5-1: 10.
3. The apparatus of claim 2, wherein the ramp is stacked with the interstitial structures stacked one on top of the other, the stack having a height that exceeds the height of the glass flume, and wherein a ballast is placed on top of the ramp to prevent the interstitial structures from floating in the water during the test.
4. The apparatus of claim 2 or 3, wherein the bulk void structures are dry straw bundled into blocks with a relative density of 0.3 to 0.5.
5. The device according to claim 1, wherein the wave height instrument is a plurality of wave height instruments, and the plurality of wave height instruments are respectively erected at the front end, the middle part, the rear end and a preset length away from the rear end of the test section.
6. The apparatus of claim 5, wherein the test sea cable model is erected at the middle end of the test section, and the wave height gauge erected at the middle of the test section is arranged right below the test sea cable model.
7. The apparatus of claim 1, further comprising:
and the processing device is used for acquiring wave element information data of different parts recorded by the wave element signal receiving device, acquiring middle section strain information data of the submarine cable model for test recorded by the signal collector, and determining a mathematical relation between the wave-induced oscillation frequency of the submarine cable model for test and the influence factors according to the wave element information data of different parts and the middle section strain information data of the submarine cable model for test.
8. A method of monitoring marine suspended cable wave induced oscillation using the marine suspended cable wave induced oscillation monitoring test apparatus of any one of claims 1 to 7, the method comprising:
when the test is started, the suspended span and the suspended height parameters of the test submarine cable model are adjusted by adjusting the steel frame arranged in the glass water tank according to the suspended span and the suspended height parameters of the actual submarine cable;
controlling the wave making plate to move and make waves according to wave element parameters by the control device according to the wave conditions for the test, and forming the wave conditions for the test in the glass water tank;
when waves are transmitted and pass through the test section, the wave height meters at all positions transmit wave element information to the wave element signal receiving device, and the test device and the process are adjusted so that the wave element information measured by all the wave height meters meets test conditions;
when waves pass through the submarine cable model for the test, wave element information data of different parts are recorded through the wave height instrument and the wave element signal receiving device, and strain information data of the submarine cable model for the test under the action of the waves are measured through the strain gauge and the signal collector.
9. The method of claim 8, further comprising:
acquiring wave element information data of different parts recorded by the wave element signal receiving device;
acquiring strain information data of the middle section of the submarine cable model for the test, which is recorded by the signal collector;
and determining a mathematical relation between the wave-induced oscillation frequency of the submarine cable model for the test and the influence factors according to the wave element information data of different parts and the middle section strain information data of the submarine cable model for the test.
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