CN111123270A - Depth detection device and buried soil height early warning system - Google Patents
Depth detection device and buried soil height early warning system Download PDFInfo
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- CN111123270A CN111123270A CN201911261331.XA CN201911261331A CN111123270A CN 111123270 A CN111123270 A CN 111123270A CN 201911261331 A CN201911261331 A CN 201911261331A CN 111123270 A CN111123270 A CN 111123270A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/06—Systems determining the position data of a target
- G01S15/08—Systems for measuring distance only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
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Abstract
The disclosure relates to a depth detection device and a buried soil height early warning system, and relates to the technical field of navigation. The depth detection device comprises a plurality of double-freedom-degree mechanical scanning depth finders which are distributed in a plurality of directions of the wind power tower foundation structure, and each double-freedom-degree mechanical scanning depth finder measures the buried soil height of the wind power tower foundation structure at a preset frequency; the double-freedom-degree mechanical scanning depth finder comprises a depth finder body and a temperature sensor; the temperature sensor is arranged inside the depth finder body, is connected with the depth finder body and is configured to measure the current water temperature in real time; the depth finder body is configured to measure the buried soil height of the wind power tower foundation structure according to a calibrated sound velocity, wherein the calibrated sound velocity is determined based on the current water temperature. The technical scheme of the utility model can measure the height of burying soil of wind power tower infrastructure in real time to comprehensive effectual realization is to the monitoring early warning of the height of burying soil of wind power tower infrastructure.
Description
Technical Field
The utility model relates to a navigation technical field especially relates to a degree of depth detection device and bury high early warning system of soil.
Background
China has abundant offshore wind energy resources, wherein the resources for offshore wind energy development reach 5 hundred million kilowatts. The offshore wind field is close to the load center, the absorption capacity is strong, and the development of wind power is gradually transferred to the sea. In order to bear the strong wind load, seawater corrosion, sea wave impact and the like, the foundation structure of the offshore wind turbine generator is far more complex than that of the onshore wind turbine generator.
The pile foundation is as the important component part of offshore wind power, and its main function is fixed wind turbine generator system, and according to seabed condition, the depth of water, fan and the environmental condition of difference, the foundation structure (being the pile foundation) of wind-powered electricity generation field mainly has four basic forms: land foundation, single pile foundation, foot stool foundation and floating foundation. The land foundation is mainly used on land, the single-pile foundation is used in a sea area with the water depth of less than 30m, the footing frame foundation is used in a sea area with the water depth of 30 m-60 m, and the floating foundation is used in a sea area with the water depth of more than 60 m. At present, the foundations used for offshore wind power project development are mainly single-pile foundations and footing foundations, but the foundations have strict requirements on water depth.
Disclosure of Invention
In order to overcome the problems in the related art, the embodiment of the disclosure provides a depth detection device and a buried height early warning system method. The technical scheme is as follows:
according to a first aspect of the embodiments of the present disclosure, there is provided a depth detection device, which is applied to measuring a buried height of an offshore wind turbine tower foundation structure; the method comprises the following steps:
the two-degree-of-freedom mechanical scanning depth sounder is distributed in multiple directions of the wind power tower foundation structure, and each two-degree-of-freedom mechanical scanning depth sounder measures the soil burying height of the wind power tower foundation structure at a preset frequency;
the two-degree-of-freedom mechanical scanning depth finder comprises a depth finder body and a temperature sensor;
the temperature sensor is arranged inside the depth finder body, is connected with the depth finder body and is configured to measure the current water temperature in real time;
the depth finder body is configured to measure a buried soil height of the wind power tower infrastructure according to a calibrated sound velocity, the calibrated sound velocity being a sound velocity determined based on the current water temperature.
In one embodiment, the number of the two-degree-of-freedom mechanical scanning depth sounders is three, the measurement angle of each two-degree-of-freedom mechanical scanning depth sounder is greater than or equal to 120 °, and the installation orientations of adjacent two-degree-of-freedom mechanical scanning depth sounders are spaced by 120 °.
In one embodiment, the two-degree-of-freedom mechanical scanning depth finder has a mounting height greater than or equal to 10m and less than or equal to 50m from the sea floor.
In one embodiment, the depth finder body comprises a receiving and transmitting combined energy changer, a transmitting module, a receiving module, a processing module, a driving control module, a first driving device and a second driving device;
the processing module is connected with the temperature sensor, the driving control module, the transmitting module and the receiving module, the driving control module is connected with the first driving device and the second driving device, and the receiving and transmitting combined energy-displacing device is connected with the first driving device and the second driving device;
the processing module is configured to generate a transmitting signal, receive an echo signal of the transmitting signal, and calculate a depth value of a current pixel point according to the transmitting signal, the echo signal and the current water temperature;
the transmitting module is configured to receive the transmitting signal generated by the processing module, perform power amplification processing on the transmitting signal and drive the transceiving transducer;
the receiving module is configured to receive the echo signals received by the transceiving transducer, amplify, filter and convert the echo signals and transmit the echo signals to the processing module;
the transceiver can be configured to transmit the transmit signal outward and receive the echo signal;
the driving control module is configured to drive the first driving device and the second driving device to operate according to the instruction of the processing module;
the first drive device and the second drive device are configured to pull the transceiver transducer to a displaced position.
In one embodiment, the first drive means comprises a horizontal rotary stepper motor and the second drive means comprises a vertical rotary stepper motor.
In one embodiment, the transception-displacement transducer comprises an outer shell, a piezoelectric ceramic transducer and a watertight sound-transmitting membrane positioned between the piezoelectric ceramic transducer and the outer shell, wherein the watertight sound-transmitting membrane is a vulcanized polyurethane film;
the piezoelectric ceramic transducer comprises a disc-shaped piezoelectric substrate, cutting gaps respectively positioned on the surfaces of two sides of the piezoelectric substrate, epoxy resin polymers filled in the cutting gaps, and electrodes covering the surfaces of the piezoelectric substrate and the epoxy resin polymers;
wherein, piezoceramics transducer's whole thickness is 2.5mm, the cutting gap will piezoelectric substrate divides into a plurality of array elements, the width of cutting gap is 0.2mm, the length and the width of array element are 0.75mm, the thickness of array element is greater than 2 with the aspect ratio of length, and is adjacent center-to-center distance between the array element is 0.95 mm.
According to a second aspect of the embodiments of the present disclosure, a buried height early warning system is provided, which is applied to the buried height early warning of an offshore wind power tower foundation structure; the system comprises a depth detection device, a data analysis and processing device and a control base station, wherein the depth detection device, the data analysis and processing device and the control base station are arranged in any embodiment of the first aspect;
the depth detection device uploads the detected soil burying height of each pixel point to the data analysis processing device, the data analysis processing device determines a height map of different pixel points of an image at the bottom of the wind power tower according to the soil burying height of each pixel point, judges whether the soil burying height exceeds a threshold value according to the height map, and sends an alarm to the control base station when the soil burying height exceeds the threshold value.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
the depth detection device provided by the technical scheme can measure the current water temperature in real time by means of the temperature sensor so as to determine the calibration sound velocity according to the current water temperature, and measure the buried soil height of the foundation structure of the wind power tower by adopting the depth finder body based on the calibration sound velocity. Because the measurement of the height of the buried soil is determined based on the calibration sound velocity which is determined based on the current water temperature, the finally measured height of the buried soil is more accurate, and therefore, the monitoring and early warning of the height of the buried soil of the foundation structure of the wind power tower can be comprehensively and effectively realized.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a schematic diagram of a distribution structure of a depth detection device shown in accordance with an exemplary embodiment;
FIG. 2 is a block schematic diagram of a mechanical scanning depth finder shown in accordance with an exemplary embodiment;
FIG. 3 is a schematic view of a mounting structure of a mechanical scanning depth finder shown in accordance with an exemplary embodiment;
FIG. 4 is a schematic diagram illustrating a configuration of a transceiver transposer in accordance with an exemplary embodiment;
FIG. 5 is a schematic diagram of a piezoelectric ceramic transducer shown in accordance with an exemplary embodiment;
FIG. 6 is a schematic structural diagram of a buried height warning system according to an exemplary embodiment;
fig. 7 is a schematic diagram illustrating operation of the buried height early warning system according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The technical scheme provided by the embodiment of the disclosure relates to a depth detection device, a buried soil height early warning system and a buried soil height early warning method, and can be applied to buried soil height measurement and early warning of an offshore wind power tower foundation structure. In the related art, the foundation structure of an offshore wind turbine is far more complex than that of an onshore wind turbine in order to bear the offshore strong wind load, seawater corrosion, sea wave impact and the like. The pile foundation is as the important component part of offshore wind power, and the main function is fixed wind turbine generator system, and according to seabed condition, the depth of water, fan and the environmental condition of difference, the foundation structure (being the pile foundation) of offshore wind-powered electricity generation field mainly has four basic forms: land foundation, single pile foundation, foot stool foundation and floating foundation. The land foundation is used for land, the single-pile foundation is used for sea areas with water depth less than 30m, the foot stool foundation is used for sea areas with water depth between 30m and 60m, and the floating foundation is used for sea areas with water depth greater than 60 m. At present, the foundations used for offshore wind power project development are mainly single-pile foundations and footing foundation, but they have strict requirements on water depth. Based on this, the technical scheme of this disclosure can real-time measurement wind power tower foundation structure bury the native height to can be comprehensive effectual realization to the monitoring early warning of the native height of burying of wind power tower foundation structure.
Fig. 1 schematically illustrates a distribution structure of a depth detection device provided in an embodiment of the present disclosure. As can be known from fig. 1, the depth detection device includes a plurality of two-degree-of-freedom mechanical scanning depth finders 10, the two-degree-of-freedom mechanical scanning depth finders 10 are distributed in a plurality of directions of the wind power tower infrastructure 20, and each two-degree-of-freedom mechanical scanning depth finder 10 measures the buried height of the wind power tower infrastructure 20 at a preset frequency.
Specifically, the two-degree-of-freedom mechanical scanning depth finder 10 includes a depth finder body 101 and a temperature sensor 102 disposed inside the depth finder body 101 and connected to the depth finder body 101. Fig. 2 schematically shows a block schematic diagram of the two-degree-of-freedom mechanical scanning depth finder 10. Wherein, temperature sensor 102 can be used to the current temperature of real-time measurement to in order to obtain the calibration sound velocity according to current temperature, depth finder body 101 can be used to measure the height of burying soil of wind-power tower foundation structure 20 according to the calibration sound velocity.
The two-degree-of-freedom mechanical scanning depth finder 10 is an instrument for automatically rotating and measuring the depth and the landform of the sea bottom in the horizontal and vertical two-dimensional directions by adopting a mechanical driving depth measuring transducer, and can specifically measure the buried soil height change of the wind power tower foundation structure according to the time difference from sound wave transmission to echo reception and the sound velocity.
Based on this, the depth detection device that this technical scheme of disclosure provided can measure current water temperature in real time with the help of temperature sensor 102 to confirm the calibration sound velocity according to current water temperature, and adopt depth finder body 101 to measure the height of burying soil of wind power tower foundation structure 20 based on the calibration sound velocity. Because the measurement of the height of the buried soil is determined based on the calibration sound velocity which is determined based on the current water temperature, the finally measured height of the buried soil is more accurate, and therefore, the monitoring and early warning of the height of the buried soil of the foundation structure of the wind power tower can be comprehensively and effectively realized.
In the embodiment of the present disclosure, the number of the two-degree-of-freedom mechanical scanning depth sounders 10 may be three, the measurement angle of each two-degree-of-freedom mechanical scanning depth sounder 10 is greater than or equal to 120 °, and the installation orientations of adjacent two-degree-of-freedom mechanical scanning depth sounders 10 are spaced by 120 °. Of course, the number of the two-degree-of-freedom mechanical scanning depth sounders 10 in the present embodiment may also be set to be more, but considering the cost, three two-degree-of-freedom mechanical scanning depth sounders 10 are already sufficient to achieve 360 ° full coverage of the area around the wind tower infrastructure 20.
Illustratively, the depth detection device includes three two-degree-of-freedom mechanical scanning depth finders 10, and the three two-degree-of-freedom mechanical scanning depth finders 10 are respectively installed in three orientations of the wind tower infrastructure 20, such as three directions of 0 °, 120 ° and 240 ° of a true orientation, but may also be other three fixed directions. Each two-degree-of-freedom mechanical scanning depth finder 10 measures the buried soil height in each direction at the hourly frequency, and the three two-degree-of-freedom mechanical scanning depth finders 10 measure the buried soil height in each direction independently and synchronously, so that buried soil height data covering 360 degrees around the wind power tower foundation structure 20 is obtained. In this embodiment, the two-degree-of-freedom mechanical scanning depth finder 10 is installed in three fixed directions, i.e., the two-degree-of-freedom mechanical scanning depth finder can be unified, so that software setting does not need to be changed according to different installation directions.
Furthermore, when the two-degree-of-freedom mechanical scanning depth sounder 10 is installed, each two-degree-of-freedom mechanical scanning depth sounder 10 is installed at the support part of the wind power tower foundation structure 20, and the installation height of the two-degree-of-freedom mechanical scanning depth sounder is within a range of being more than or equal to 10m and less than or equal to 50m from the sea bottom, so that the two-degree-of-freedom mechanical scanning depth sounder has better adaptability to the wind power tower foundation structure 20 with a single-pile foundation and a foot stool foundation.
As can be seen from the block diagram of the two-degree-of-freedom mechanical scanning depth finder 10 shown in fig. 2, the two-degree-of-freedom mechanical scanning depth finder 10 includes a depth finder body 101 and a temperature sensor 102, the depth finder body 101 includes a power module 1010, a transmitting and receiving transducer 1011, a transmitting module 1012, a receiving module 1013, a processing module 1014, a driving control module 1015, a first driving device 1016 and a second driving device 1017, the first driving device 1016 may be a horizontal rotation stepping motor, and the second driving device 1017 may be a vertical rotation stepping motor.
The Processing module 1014 may adopt a DSP (Digital Signal Processing) Processing module, and is connected to the temperature sensor 102, the driving control module 1015, the transmitting module 1012 and the receiving module 1013, and is configured to generate a transmitting Signal and receive an echo Signal of the transmitting Signal, and calculate a depth value of a current pixel point according to a current water temperature, the transmitting Signal and the echo Signal; the transmitting module 1012 and the receiving module 1013 are both connected to the transceiver transducer 1011, the transmitting module 1012 is configured to receive a transmitting signal generated by the processing module 1014 and amplify the power of the transmitting signal to drive the transceiver transducer 1011 to transmit a sound wave, the receiving module 1013 is configured to receive an echo signal received by the transceiver transducer 1011 and transmit the echo signal to the processing module 1014 after performing amplification filtering and analog-to-digital conversion, and the transceiver transducer 1011 is configured to transmit the transmitting signal and receive the echo signal; the driving control module 1015 may be connected to the first driving device 1016 and the second driving device 1017, and is configured to drive the first driving device 1016 and the second driving device 1017 according to the instructions of the processing module 1014; the first driving device 1016 and the second driving device 1017 are further connected with the receiving and transmitting combined energy-exchanging device 1011, and are used for drawing the receiving and transmitting combined energy-exchanging device 1011 to move positions according to instructions of the driving control module 1015; the power module 1010 may provide operating power to all components.
Fig. 3 schematically shows a mounting structure of the two-degree-of-freedom mechanical scanning depth finder 10. Specifically, the combined transceiver transducer 1011 is located at the front end of the mechanical scanning depth finder, and a circular piezoelectric ceramic transducer with a diameter of 116mm can be used.
During actual depth measurement, the DSP processing module 1014 generates a transmitting signal and transmits the transmitting signal to the transmitting module 1012, the transmitting module 1012 amplifies the power of the transmitting signal and then drives the transceiver displacement energy 1011 to transmit a sound wave signal to the water bottom, and then the sound energy returns from the water bottom in the form of an echo, at this time, the transceiver displacement energy 1011 can receive an echo signal of the sound wave signal and convert the sound energy into electric energy to transmit to the receiving module 1013, and the receiving module 1013 performs preprocessing such as amplification and filtering and analog-to-digital conversion on the echo signal and then transmits a digital signal to the DSP processing module 1014; meanwhile, the temperature sensor 102 may transmit the temperature value acquired in real time to the DSP processing module 1014, so that the DSP processing module 1014 can determine the actual speed of sound based on the current water temperature; based on this, the DSP processing module 1014 can calculate the depth value of the current pixel point according to the sound velocity determined by the current water temperature and the time difference from the transmission signal to the reception signal. During this time, the main functions of the DSP processing module 1014 are to transmit acoustic signals and receive echo signals, data transmission in real time, and to provide synchronization signals of the entire system.
After measuring the depth of a pixel, the DSP processing module 1014 generates a position moving command and transmits the position moving command to the driving control module 1015, so that the driving control module 1015 drives the first driving device 1016, i.e. a horizontal rotation stepping motor, and the second driving device 1017, i.e. a vertical rotation stepping motor, according to the position movement instruction, to operate according to a set program, the horizontal rotation stepping motor can drive the receiving and transmitting energy exchanger 1011, the transmitting module 1012, the receiving module 1013, and the vertical rotation stepping motor to horizontally reciprocate, the stepping progress can reach 0.8 °, the vertical rotation stepping motor is installed at the rotor end of the horizontal rotation stepping motor, can drive the receiving and transmitting combined energy-exchanging device 1011, the transmitting module 1012 and the receiving module 1013 to horizontally reciprocate and the stepping progress can reach 0.8 degree, therefore, the position change of the transmitting and receiving combined transducer 1011 can be realized, and the horizontal and vertical two-dimensional mechanical beam scanning process can be further realized.
The following describes specific implementations of various components of the depth detection device provided in the embodiments of the present disclosure.
Overall, the working frequency of the depth detection device is 800kHz, the weight in the air is 7kg, the position of the sound probe is hemispherical, the maximum diameter is about phi 200mm, the position of the electronic cabin is cylindrical, and the length is about 150 mm.
The temperature sensor 102 can adopt a PT100 temperature probe, and the temperature precision is not lower than 0.3 degrees. Of course, this is merely an exemplary illustration, and other temperature sensors may be used in practical applications, which is not specifically limited in this embodiment.
The transmitting module 1012 is used for amplifying the signal source generated by the DSP processing module 1014 and controlling the transceiver transducer 1011 to transmit an acoustic signal, and its main function is power amplification, and optionally a low noise power amplifier.
The receiving module 1013 is configured to perform amplification filtering processing, a/D sampling and subsequent signal processing on the echo signal received by the transceiver 1011, and transmit the processed signal to the DSP processing module 1014, where the filtering processing may use a band-pass preamplifier, the passband range is 720-880 kHz, the fluctuation in the passband is less than 1dB, and the amplification gain is 40 dB.
The DSP processing module 1014 is configured to generate a transmitting acoustic signal and transmit the transmitting acoustic signal to the transmitting module 1012, and acquire an echo signal transmitted by the receiving module 1013, and perform matched filtering processing on the echo signal, so as to calculate a depth value of a measured pixel, where a DSP digital circuit and a DSP chip both use mature devices.
The power module 1010 has an overload protection function, and can supply power to each module in the mechanical scanning depth finder, and the power supply voltage at least comprises outputs of +/-5V, +/-24V and +/-40V.
A stepper motor is an open-loop control element that converts electrical pulse signals into angular or linear displacements. In the case of non-overload, the rotational speed of the motor and the position of the stop depend only on the frequency and the number of pulses of the pulse signal and are not affected by the load variations. When the step driver receives a pulse signal, the step driver can drive the step motor to rotate by a fixed angle, namely a 'step angle', the rotation of the step motor runs in one step at the fixed angle, the angular displacement can be controlled by controlling the number of pulses, the aim of accurate positioning is achieved, and meanwhile, the rotating speed and the acceleration of the motor can be controlled by controlling the pulse frequency, so that the aim of speed regulation is achieved.
The stator end of the horizontal rotation stepping motor is arranged on a fixed structure of the double-freedom-degree mechanical scanning depth finder, the load receiving and transmitting combined transducer 1011, the transmitting module 1012, the receiving module 1013 and the vertical rotation stepping motor at the rotor end can drive the load to rotate horizontally, and the stepping angle is not more than 0.8 degrees. The present embodiment can adopt a three-phase motor, and the driving control module 1015, i.e., the motor control module, is used for driving control.
The stator end of the vertical rotation stepping motor is arranged at the rotor end of the horizontal rotation stepping motor, the load receiving and transmitting combined transducer 1011, the transmitting module 1012 and the receiving module 1013 at the stator end can drive the load to vertically rotate, and the stepping angle is not more than 0.8 degrees. The present embodiment can adopt a three-phase motor, and the driving control module 1015, i.e., the motor control module, is used for driving control.
The transmitting and receiving combined transducer 1011 is made of a piezoelectric ceramic wafer, the diameter of the piezoelectric ceramic wafer is about 100mm, beam control is carried out in a cutting mode, the center frequency is 800kHz, the working bandwidth is not less than 720-880 kHz, the beam opening angle is less than 0.8 degrees, the maximum transmitting voltage response level is not less than 170dB, the receiving sensitivity is not less than-190 dB, the working bandwidth is not less than 720-880 kHz, and the fluctuation of sound pressure sensitivity in the working frequency band is less than 1 dB.
Fig. 4 schematically shows a structure of the combined transmitting and receiving transducer 1011. As shown in fig. 4, the transducer 1011 includes an outer housing 401, a piezoelectric ceramic transducer, and a water-tight sound-transmitting membrane 402 disposed therebetween and covering the surface of the piezoelectric ceramic transducer. The outer shell 401 is made of a material with high strength, low density and good corrosion resistance, the watertight sound-transmitting membrane 402 is a vulcanized polyurethane film, and the piezoelectric ceramic transducer can be made of a piezoelectric ceramic piece with a higher grade.
Specifically, the piezoelectric ceramic transducer may include a disk-shaped piezoelectric substrate 4031 shown in fig. 5, cutting slits respectively provided on both side surfaces of the piezoelectric substrate 4031, an epoxy polymer 4032 filled inside the cutting slits, and electrodes covering the surfaces of the piezoelectric substrate 4031 and the epoxy polymer 4032. Wherein, the cutting gap on piezoelectric substrate 4031 surface is the gap that the two-dimensional cutting produced, it can all divide into a plurality of array elements with two surfaces of piezoelectric substrate 4031, the width of cutting gap is 0.2mm, the length and the width of every array element are 0.75mm, the centre-to-centre spacing of adjacent array element is 0.95mm, radial array element number is 105, the thickness of each array element is greater than 2 with the aspect ratio of length, the whole thickness of the piezoelectric ceramic transducer who finally obtains is 2.5mm, the piezoelectric ceramic transducer who so makes can effectually avoid the strong coupling vibration.
For example, the transception/transception transducer 1011 can be made of a disc-shaped PZT4 (lead zirconate titanate) piezoelectric composite material, and the specific process comprises the following steps: adopting a high-precision laser cutter to cut the PZT4 piezoelectric ceramic sheet for multiple times in the transverse and longitudinal directions to form a plurality of piezoelectric ceramic columns as array elements, for example, firstly carrying out longitudinal cutting, cutting from the middle to two sides, wherein the cutting gap is 0.2mm, the array element interval is 0.95mm, rotating 90 degrees after the longitudinal cutting is finished, and then carrying out transverse cutting, the cutting gap is 0.2mm, and the array element interval is 0.95 mm; after cutting, cleaning the PZT4 piezoelectric ceramic wafer by using alcohol, and processing cutting burrs; then, epoxy resin is poured into the cutting gap, attention is paid to the fact that the epoxy resin needs to be heated before pouring, meanwhile, compression treatment needs to be carried out on the epoxy resin to discharge internal bubbles, heating and pressurization treatment needs to be carried out on the PZT4 piezoelectric ceramic piece during pouring to prevent the generation of pouring bubbles, and therefore the uniformity of the array element structure after pouring is guaranteed; after the pouring and the epoxy resin curing are finished, the surfaces of the two sides of the PZT4 piezoelectric ceramic plate are ground to be 2.5mm in thickness, and the surfaces of the two sides are cleaned by alcohol; then, electrodes can be respectively formed on the surfaces of the two sides of the PZT4 piezoelectric ceramic piece in a silver evaporation plating mode to obtain a positive electrode and a negative electrode, and the positive electrode and the negative electrode are led out by using a shielding lead, so that the basic structure of the piezoelectric ceramic transducer is obtained; after the piezoelectric ceramic transducer is manufactured, the piezoelectric ceramic transducer can be installed in the outer shell 401, and a shielding lead is led out through a reserved hole in the rear of the outer shell 401; and finally, performing watertight packaging on the piezoelectric ceramic transducer, namely vulcanizing a 2mm watertight sound-transmitting membrane 402 on the surface of the piezoelectric ceramic transducer by adopting a polyurethane material, and polishing and cleaning the surface of the piezoelectric ceramic transducer after vulcanization. The transmit-receive hybrid transposer 1011 obtained based on the above method has a better aspect ratio and a better operating bandwidth.
The technical scheme of the disclosure also provides a soil burying height early warning system, which is applied to soil burying height early warning of an offshore wind power tower foundation structure. Fig. 6 is a schematic diagram illustrating a distribution structure of the buried soil height warning system in the present disclosure. As shown in fig. 6, the buried height early warning system may include the depth detection device 20, the data analysis processing device 30, the communication device 40 and the control base station. The depth detection device can upload the detected soil burying height of each pixel point to the data analysis processing device 30, the data analysis processing device 30 can determine a height map of different pixel points of the image at the bottom of the wind power tower according to the soil burying height of each pixel point, judge whether the soil burying height exceeds a threshold value according to the height map, and send an alarm to the control base station through the communication device 40 when the soil burying height exceeds the threshold value. The threshold value is preset and may be set based on empirical values. When the buried soil height value exceeds the threshold value, the buried soil height is judged to be abnormal, and when the buried soil height value does not exceed the threshold value, the buried soil height is judged to be normal.
Fig. 7 is a schematic diagram illustrating the operation of the buried height early warning system. The data analysis processing device 30, the communication device 40 and the control base station are all arranged above the sea surface. Specifically, the two-degree-of-freedom mechanical scanning depth finder 10 of the depth detection device may be connected to the data analysis processing device 30 through a serial port, so as to transmit the depth data detected by the depth detection device to the data analysis processing device 30 through the serial port; the data analysis processing device 30 may perform analysis processing, that is, secondary processing and threshold judgment, on the received depth data, specifically, perform fusion drawing on the heights of different pixel points measured by each mechanical scanning depth finder to form a wind power tower bottom image, thereby determining a height map of different pixel points of the wind power tower bottom image, and judging whether the height map reaches an alarm threshold, and then transmitting the processing result to the control base station by means of the communication device 40, wherein the communication device 40 preferably employs wireless communication; the control base station is a ground control center and can monitor the overall state of the soil burying height early warning system according to the processing structure, so that the monitoring and warning can be timely carried out when the soil burying height is not in accordance with the requirement, and the monitoring and early warning of the soil burying height of the wind power tower foundation structure can be comprehensively and effectively realized.
It should be noted that: the frequency of the depth detection device for measuring the buried soil height can be set according to actual requirements, and each two-degree-of-freedom mechanical scanning depth finder 10 can synchronously measure and upload the buried soil height, so that the data analysis and processing device can analyze the data based on the measurement data at the same time, and the accuracy of images at the bottom of the wind power tower is ensured.
In this exemplary embodiment, as shown in fig. 6, the buried height early warning system may further include a marine growth removing device 50, where the marine growth removing device 50 is located within a preset range of the two-degree-of-freedom mechanical depth finder 10, and is configured to prevent marine growth from attaching to the surface of the two-degree-of-freedom mechanical depth finder 10.
In one embodiment, the marine growth removing apparatus 50 may be an electric shock device, such as an electric shock probe, which is installed around the two-degree-of-freedom mechanical depth finder 10 and discharges in a pulse manner at preset intervals, so as to remove marine growth near the two-degree-of-freedom mechanical depth finder 10.
In one embodiment, the marine growth removing device 50 may further adopt an anti-adhesion coating, which may be coated on the surface of the transceiver transducer 1011 of the two-degree-of-freedom mechanical depth finder 10, so as to prevent marine growth from adhering to the surface of the two-degree-of-freedom mechanical depth finder 10. It should be noted that: fig. 6 only shows the marine growth repelling effect of the marine growth removing device 50 by way of example, but the actual anti-adhesion coating should be combined with the surface of the mechanical scanning depth finder.
Here, for example, the electric shock probe is installed to repel marine creatures, and the electric shock probe may be installed near each two-degree-of-freedom mechanical depth finder 10, where the probe distance is 20cm, the voltage between two electrodes is 220V, the electric shock output power consumption is 200W, and pulse discharge may be performed for 5 minutes in a period of 4 hours, so as to electrically shock and repel the marine creatures within 0.5m around the two-degree-of-freedom mechanical depth finder 10, and prevent the marine creatures from adhering and growing on the surface of the mechanical depth finder. Of course, the electric shock period and the electric shock duration may be set to other values as long as the adhesion of marine life can be effectively prevented, and this embodiment is not particularly limited. It should be understood that the data analysis and processing device in this embodiment can control the operation parameters of the shock probe, including the shock period and the shock duration.
Based on this, the height of burying soil early warning device that this disclosed technical scheme provided, on the one hand accessible real-time measurement wind-powered electricity generation tower foundation structure bury the soil height and realize the monitoring early warning to wind-powered electricity generation tower foundation structure bury the soil height, on the other hand still can prevent that marine life from attaching to the surface of two degree of freedom mechanical scanning depth sounders 10 through setting up marine life clearing device 50 to ensure the measurement accuracy of mechanical scanning depth sounder.
It should be noted that: the early warning system of the single-point wind power tower in the early warning system of the soil burying height of the offshore wind power tower foundation structure is realized, and the single-point early warning system can be integrated to become a regional early warning system in order to achieve the regional early warning function of the wind power tower, so that the whole early warning of the soil burying height of the wind power tower foundation structure can be comprehensively and effectively realized.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure should be limited only by the attached claims.
Claims (7)
1. A depth detection device is characterized by being applied to measuring the buried soil height of an offshore wind power tower foundation structure; the method comprises the following steps:
the two-degree-of-freedom mechanical scanning depth sounder is distributed in multiple directions of the wind power tower foundation structure, and each two-degree-of-freedom mechanical scanning depth sounder measures the soil burying height of the wind power tower foundation structure at a preset frequency;
the two-degree-of-freedom mechanical scanning depth finder comprises a depth finder body and a temperature sensor;
the temperature sensor is arranged inside the depth finder body, is connected with the depth finder body and is configured to measure the current water temperature in real time;
the depth finder body is configured to measure a buried soil height of the wind power tower infrastructure according to a calibrated sound velocity, the calibrated sound velocity being a sound velocity determined based on the current water temperature.
2. The depth detection device of claim 1, wherein the number of the two-degree-of-freedom mechanical scanning depth sounders is three, a measurement angle of each two-degree-of-freedom mechanical scanning depth sounder is greater than or equal to 120 °, and installation orientations of adjacent two-degree-of-freedom mechanical scanning depth sounders are spaced by 120 °.
3. The depth detection device of claim 1, wherein the two-degree-of-freedom mechanical scanning depth finder has a mounting height greater than or equal to 10m and less than or equal to 50m from the sea floor.
4. The depth detection device of claim 1, wherein the depth finder body comprises a transceiver, a transmitting module, a receiving module, a processing module, a driving control module, a first driving device and a second driving device;
the processing module is connected with the temperature sensor, the driving control module, the transmitting module and the receiving module, the driving control module is connected with the first driving device and the second driving device, and the receiving and transmitting combined energy-displacing device is connected with the first driving device and the second driving device;
the processing module is configured to generate a transmitting signal, receive an echo signal of the transmitting signal, and calculate a depth value of a current pixel point according to the transmitting signal, the echo signal and the current water temperature;
the transmitting module is configured to receive the transmitting signal generated by the processing module, perform power amplification processing on the transmitting signal and drive the transceiving transducer;
the receiving module is configured to receive the echo signals received by the transceiving transducer, amplify, filter and convert the echo signals and transmit the echo signals to the processing module;
the transceiver can be configured to transmit the transmit signal outward and receive the echo signal;
the driving control module is configured to drive the first driving device and the second driving device to operate according to the instruction of the processing module;
the first drive device and the second drive device are configured to pull the transceiver transducer to a displaced position.
5. The depth sensing device of claim 4, wherein the first drive comprises a horizontal rotary stepper motor and the second drive comprises a vertical rotary stepper motor.
6. The depth detection device of claim 4, wherein the transceive transducer comprises an outer housing, a piezoelectric ceramic transducer, and a watertight acoustic membrane therebetween, wherein the watertight acoustic membrane is a vulcanized polyurethane membrane;
the piezoelectric ceramic transducer comprises a disc-shaped piezoelectric substrate, cutting gaps respectively positioned on the surfaces of two sides of the piezoelectric substrate, epoxy resin polymers filled in the cutting gaps, and electrodes covering the surfaces of the piezoelectric substrate and the epoxy resin polymers;
wherein, piezoceramics transducer's whole thickness is 2.5mm, the cutting gap will piezoelectric substrate divides into a plurality of array elements, the width of cutting gap is 0.2mm, the length and the width of array element are 0.75mm, the thickness of array element is greater than 2 with the aspect ratio of length, and is adjacent center-to-center distance between the array element is 0.95 mm.
7. A buried height early warning system is characterized by being applied to buried height early warning of an offshore wind power tower foundation structure; comprises a depth detection device according to any one of claims 1 to 6, a data analysis processing device, and a control base station;
the depth detection device uploads the detected soil burying height of each pixel point to the data analysis processing device, the data analysis processing device determines a height map of different pixel points of an image at the bottom of the wind power tower according to the soil burying height of each pixel point, judges whether the soil burying height exceeds a threshold value according to the height map, and sends an alarm to the control base station when the soil burying height exceeds the threshold value.
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Application publication date: 20200508 |