NL2027286A - In-situ measurement system and method for medium- and low-frequency acoustic properties of seafloor sediments - Google Patents

In-situ measurement system and method for medium- and low-frequency acoustic properties of seafloor sediments Download PDF

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Publication number
NL2027286A
NL2027286A NL2027286A NL2027286A NL2027286A NL 2027286 A NL2027286 A NL 2027286A NL 2027286 A NL2027286 A NL 2027286A NL 2027286 A NL2027286 A NL 2027286A NL 2027286 A NL2027286 A NL 2027286A
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probe
horizontal
vertical
cylinder
medium
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NL2027286A
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Dutch (nl)
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NL2027286B1 (en
Inventor
Kan Guangming
Liu Baohua
Pei Yanliang
Zhang Yingying
Liu Jingxi
Li Guanbao
Meng Xiangmei
Wang Jingqiang
Lu Dequan
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First Institute Of Oceanography Mini Of Natural Resources
Nat Deep Sea Ct
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
    • G01V1/3843—Deployment of seismic devices, e.g. of streamers
    • G01V1/3852—Deployment of seismic devices, e.g. of streamers to the seabed
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
    • G01V1/3808—Seismic data acquisition, e.g. survey design
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/02—Generating seismic energy
    • G01V1/04—Details
    • G01V1/047—Arrangements for coupling the generator to the ground
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
    • G01V1/168—Deployment of receiver elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
    • G01V1/3861—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas control of source arrays, e.g. for far field control
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output

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  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Remote Sensing (AREA)
  • Acoustics & Sound (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Oceanography (AREA)
  • Automation & Control Theory (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

The present disclosure discloses an in-situ measurement sys- tem and method for medium- and low-frequency acoustic prop- erties of seafloor sediments, including a bearing frame. The bearing frame is provided with a control cabin, a hydraulic 5 cabin, a vertical probe penetrating mechanism, and a hori- zontal probe support mechanism, the top of the bearing frame is provided with a lifting ring, the bottom of the vertical probe is fixedly provided with two receiving transducers vertically spaced, the horizontal probe support mechanism 10 includes a driving device fixed on the bearing frame, an output shaft of the driving device is perpendicular and fixedly connected to one end of a horizontal probe, the driving device can drive the horizontal probe to rotate with the output shaft as a central axis, and the other end of the 15 horizontal probe is provided with a transmitting transducer. The control cabin is provided with a control circuit, the hydraulic cabin is provided with a penetrating cylinder pressure sensor electrically connected to the control cir- cuit, and the control circuit is electrically connected to 20 a display and control system through a cable. According to the present disclosure, in-situ measurement of the propaga- tion property of the medium- and low-frequency acoustic wave in the sediments is achieved.

Description

IN-SITU MEASUREMENT SYSTEM AND METHOD FOR MEDIUM- AND LOW- FREQUENCY ACOUSTIC PROPERTIES OF SEAFLOOR SEDIMENTS
TECHNICAL FIELD The present disclosure relates to the technical field of seafloor measurement devices, in particular to an in- situ measurement system and method for medium- and low- frequency acoustic properties of seafloor sediments.
BACKGROUND The seafloor is an important boundary of an underwater sound field. The acoustic properties of seafloor sediments have an important influence on a propagation law of an acoustic wave in seawater and a spatial structure of the underwater sound field. Measurement and research of the acoustic properties of the seafloor sediments have important application value in fields of marine sound field forecast- ing, underwater communication and navigation, seafloor topo- graphic mapping, and seafloor resource exploration. There are mainly two methods for direct measurement of the acous- tic properties of the seafloor sediments: laboratory meas- urement of a sediment sample and in-situ seafloor measure- ment. In-situ acoustic measurement of seafloor sediments is to place an acoustic instrument on the seafloor to directly measure a propagation property of an acoustic wave in the sediments. This method avoids disturbance to the sediments caused by sample sampling and transference. Further, a sur- rounding environment is not changed, so a measurement result is more accurate and reliable than laboratory measurement of a sample. At present, a horizontal measurement method or a lon- gitudinal measurement method is usually used for an in-situ measurement system for medium- and low-frequency acoustic properties of the seafloor sediments. However, only a prop- agation property of a high-frequency acoustic wave in the sediments can be measured by using the two methods men- tioned-above, and a propagation property of a medium- and low-frequency acoustic wave in the sediments cannot be meas- ured.
SUMMARY The present disclosure aims to provide an in-situ meas- urement system and method for medium- and low-frequency acoustic properties of seafloor sediments to overcome the disadvantages in the prior art, so as to measure a propaga- tion properties of a medium- and low-frequency acoustic wave in the sediments.
To achieve the above purpose, the present disclosure provides the following technical solutions.
An in-situ measurement system for medium- and low-fre- quency acoustic properties of seafloor sediments includes a bearing frame, where the bearing frame is provided with a control cabin, a hydraulic cabin, a vertical probe pene- trating mechanism, and a horizontal probe support mechanism; the vertical probe penetrating mechanism includes a vertical guide rail fixed on the bearing frame, the top of the guide rail is fixedly provided with a penetrating cylinder, a cylinder rod of the penetrating cylinder is fixedly con- nected to a sliding block, the sliding block slidingly cor operates with the guide rail, the sliding block is fixedly provided with a movable clamping cylinder, the bottom of the guide rail is fixedly provided with a fixed clamping cylin- der, the movable clamping cylinder and the fixed clamping cylinder clamp a same vertical probe, the bottom of the vertical probe is fixedly provided with two receiving trans- ducers vertically spaced, and the penetrating cylinder can drive the vertical probe to lift; the horizontal probe sup- port mechanism includes a driving device fixed on the bear- ing frame, an output shaft of the driving device is perpen- dicular and fixedly connected to one end of a horizontal probe, the driving device can drive the horizontal probe to rotate with the output shaft as a central axis, the other end of the horizontal probe is provided with a transmitting transducer, the transmitting transducer is a medium- and low-frequency acoustic wave transmitting transducer, and the receiving transducer can receive a medium- and low-frequency acoustic wave; and the control cabin is provided with a control circuit, the hydraulic cabin is provided with a penetrating cylinder pressure sensor electrically connected to the control circuit, and the control circuit is electri- cally connected to a display and control system through a cable.
Preferably, the horizontal probe is further provided with a lifting cylinder, a cylinder rod of the lifting cyl- inder is perpendicular to the horizontal probe, the trans- mitting transducer is fixedly connected to the cylinder rod of the lifting cylinder, and the lifting cylinder can drive the transmitting transducer to lift, Preferably, the horizontal probe support mechanism fur- ther includes a horizontal position limit bracket and a vertical position limit plate, the driving device is a hy- draulic motor, the horizontal position limit bracket is fixed on the bearing frame, and the hydraulic motor is fixed on the horizontal position limit bracket; and the top of the bearing frame is provided with a receiving hole correspond- ing to the horizontal probe, the receiving hole is provided with a notch, when being in a vertical state, the horizontal probe passes through the receiving hole, and the vertical position limit plate is detachably installed at the notch by using a bolt.
Preferably, the hydraulic cabin is airtight, and the hydraulic cabin is further provided with a penetrating cyl- inder pressure sensor, a hydraulic motor pressure sensor, and a lifting cylinder pressure sensor separately electri- cally connected to the control circuit; the control cabin is sealed, and the control cabin is further provided with an attitude sensor electrically connected to the control circuit; and the sliding block is provided with a displace- ment sensor electrically connected to the control circuit,
and an output shaft of the hydraulic motor is provided with an angle sensor electrically connected to the control cir- cuit.
Preferably, the bottom of the bearing frame is provided with a plurality of feet, the top of the bearing frame is provided with a lifting ring, and the bearing frame, the lifting ring, and the feet form a bearing platform.
Preferably, the transmitting transducer is electri- cally connected to an acoustic wave transmitting circuit in the control circuit, and the receiving transducer is elec- trically connected to an acoustic wave receiving circuit in the control circuit.
An in-situ measurement method for medium- and low-fre- quency acoustic properties of seafloor sediments is pro- vided. The method is based on the in-situ measurement system for medium- and low-frequency acoustic properties of sea- floor sediments, and includes the following steps: {1} electrically connecting the control circuit in the control cabin to a real-time display and control unit of a deck console; (2) retracting the horizontal probe to a vertical state by using the real-time display and control unit, and opening the vertical position limit plate to ensure that the hori- zontal probe can be retracted and released underwater; (3) deploying the in-situ measurement system into water by using a hoisting device until the bearing platform hits the seafloor, where after being located above the seafloor sediment, the in-situ measurement system can no longer sink; and during a deployment process, the horizontal probe rod is kept in a vertical state; {4) driving the vertical probe to move downward by using the penetrating cylinder until the receiving trans- ducer at the bottom of the vertical probe is located at a preset depth in the seafloor sediment; and driving the hor- izontal probe to a horizontal state by using the hydraulic motor;
(5) sending, by the real-time display and control sys- tem, an acoustic wave transmission and acquisition parameter and instruction to an acoustic wave transmission and acqui- sition system in the control circuit encapsulated in the 5 control cabin; transmitting, by the transmitting transducer, a medium- and low-frequency acoustic wave signal; and re- ceiving, by the receiving transducer, the medium- and low- frequency acoustic wave signal, and uploading the acquired data to the real-time display and control system; {6) restoring the horizontal probe to the vertical state by using the hydraulic motor, and driving the vertical probe to rise by using the penetrating cylinder until the vertical probe returns to an original position; and (7) retracting the in-situ measurement system to a mother ship by using the hoisting device.
Preferably, in step (4), when the penetrating cylinder cannot drive the vertical probe to the preset depth at one time, the vertical probe is driven by the penetrating cyl- inder to perform several insertion actions until the re- ceiving transducer at the bottom of the vertical probe is located at the preset depth in the seafloor sediments.
The in-situ measurement system for medium- and low- frequency acoustic properties of seafloor sediments accord- ing to the present disclosure achieves the following tech- nical effect compared with the prior art.
The in-situ measurement system for medium- and low- frequency acoustic properties of seafloor sediments accord- ing to the present disclosure achieves in-situ measurement of the propagation property of the medium- and low-frequency acoustic wave in the sediments.
BRIEF DESCRIPTION OF DRAWINGS To describe the technical solutions in the examples of the present disclosure or in the prior art more clearly, the following briefly describes the accompanying drawings re- quired for describing the examples. Apparently, the accom- panying drawings in the following description show merely some examples of the present disclosure, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an in-situ measurement system that is in a working state and that is for medium- and low-frequency acoustic properties of sea- floor sediments according to the present disclosure; FIG. 2 is a schematic structural diagram of an in-situ measurement system that is in a zero state and that is for medium- and low-frequency acoustic properties of seafloor sediments according to the present disclosure; FIG. 3 is a schematic structural diagram of a vertical probe penetrating mechanism in an in-situ measurement system for medium- and low-frequency acoustic properties of sea- floor sediments according to the present disclosure; FIG. 4 is a schematic diagram of signal transmitting and receiving of a transducer in an in-situ measurement system for medium- and low-frequency acoustic properties of seafloor sediments according to the present disclosure; and FIG. 5 is a schematic circuit diagram of a control unit in an in-situ measurement system for medium- and low-fre- guency acoustic properties of seafloor sediments according to the present disclosure.
Numeral references: 1. vertical probe; 2. vertical probe penetrating mechanism; 2-1. penetrating cylinder; 2-
2. movable clamping cylinder; 2-3. sliding block; 2-4. guide rail; 2-5. fixed clamping cylinder; 3. bearing platform; 3-
1. bearing frame; 3-2. lifting ring; 3-3. foot; 4. horizon- tal probe support mechanism; 4-1. vertical position limit plate; 4-2. horizontal position limit bracket; 4-3. hydrau- lic motor; 5. horizontal probe; 6. control cabin; 7. hy- draulic cabin; 8. transmitting transducer; 9. receiving transducer; 10. attitude sensor; 11. penetrating cylinder pressure sensor; 12. hydraulic motor pressure sensor; 13.
lifting cylinder pressure sensor; 14. angle sensor; 15. dis- placement sensor; and 16. Lifting cylinder.
DETAILED DESCRIPTION The following clearly and completely describes the technical solutions in the examples of the present disclo- sure with reference to accompanying drawings in the examples of the present disclosure. Apparently, the described exam- ples are merely a part rather than all of the examples of the present disclosure. All other examples obtained by a person of ordinary skill in the art based on the examples of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure, The present disclosure aims to provide an in-situ meas- urement system and method for medium- and low-frequency acoustic properties of seafloor sediments to resolve a dis- advantage in the prior art, so as to measure a propagation property of a medium- and low-frequency acoustic wave in the sediments.
To make the foregoing objective, features, and ad- vantages of the present disclosure clearer and more compre- hensible, the present disclosure is further described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in FIG. 1 to FIG. 4, an in-situ measurement system for medium- and low-frequency acoustic properties of seafloor sediments in this embodiment includes a bearing frame 3-1. The bearing frame 3-1 is provided with a control cabin 6, a hydraulic cabin 7, a vertical probe penetrating mechanism 2, and a horizontal probe support mechanism 4. The top of the bearing frame 3-1 is provided with a lifting ring 3-2. A vertical probe penetrating mechanism 1 includes a vertical guide rail 2-4 fixed on the bearing frame 3-1. The top of the guide rail 2-4 is fixedly provided with a pene- trating cylinder 2-1. A cylinder rod of the penetrating cylinder 2-1 is fixedly connected to a sliding block 2-3, The sliding block 2-3 slidingly cooperates with the guide rail 2-4, and the sliding block 2-3 is fixedly provided with a movable clamping cylinder 2-2. The bottom of the guide rail 2-4 is fixedly provided with a fixed clamping cylinder
2-5. The movable clamping cylinder 2-2 and the fixed clamp- ing cylinder 2-5 clamp a same vertical probe 1. The bottom of the vertical probe 1 is fixedly provided with two re- ceiving transducers 9 vertically spaced. The horizontal probe support mechanism 4 includes a driving device fixed on the bearing frame 3-1. An output shaft of the driving device is perpendicular and fixedly connected to one end of a horizontal probe 5. The driving device can drive the hor- izontal probe 5 to rotate with the output shaft as a central axis. The other end of the horizontal probe 5 is provided with a transmitting transducer 8. The receiving transducer 9 is a broadband transducer, and the receiving transducer 9 can receive a medium- and low-frequency acoustic wave. Based on a coordinated action of the movable clamping cylinder 2-2, the fixed clamping cylinder 2-5, and the pen- etrating cylinder 2-1, the vertical probe penetrating mech- anism may continuously insert the vertical probe 1 down- wards, to insert the receiving transducer 9 into the sedi- ment to a sufficient depth. The horizontal probe support mechanism drives the horizontal probe 5 to a horizontal position, so that there may be a long enough distance between the transmitting transducer 8 and the receiving transducer
9. Further, a lifting cylinder 16 helps to implement lifting and lowering of the transmitting transducer 8 on the hori- zontal probe 5, to ensure that the transmitting transducer 8 can be close to a surface of the seafloor sediment, so that a measurement condition of the medium- and low-fre- quency acoustic properties can be met.
The horizontal probe 5 is also provided with the lift- ing cylinder 16. A cylinder rod of the lifting cylinder 16 is perpendicular to the horizontal probe 5. The transmitting transducer 8 is fixedly connected to the cylinder rod of the lifting cylinder 16. The horizontal probe support mechanism 4 further includes a horizontal position limit bracket 4-2 and a vertical position limit plate 4-1. The driving device is a hydraulic motor 4-3. The horizontal position limit bracket 4-2 is fixed on the bearing frame 3-1. The hydraulic motor 4-3 is fixed on the horizontal position limit bracket 4-2. The top of the bearing frame is provided with a re- ceiving hole corresponding to the horizontal probe 5, and the receiving hole is provided with a notch. When being in a vertical state, the horizontal probe 5 passes through the receiving hole. The vertical position limit plate 4-1 is detachably installed at the gap by using a bolt. When the measuring system is in a storage state, the vertical posi- tion limit plate 4-1 fixes the horizontal probe 5 in the receiving hole to prevent the horizontal probe 5 from swing- ing outward due to vibration or another reason. The bottom of the bearing frame 3-1 is provided with a quantity of feet 3-3. The top of the bearing frame 3-1 is provided with the lifting ring 3-2. The bearing frame 3-1, the lifting ring 3-2, and the feet 3-3 form a bearing platform 3.
The control cabin 6 is provided with a control circuit and an attitude sensor 10 electrically connected to the control circuit. The hydraulic cabin 7 is airtight. The hydraulic cabin 7 is provided with a penetrating cylinder pressure sensor 11, a hydraulic motor pressure sensor 12, and a lifting cylinder pressure sensor 13 separately elec- trically connected to the control circuit. The penetrating cylinder pressure sensor 11, the hydraulic motor pressure sensor 12, and the lifting cylinder pressure sensor 13 are respectively connected to corresponding oil pipes. Oil pipes of the penetrating cylinder 2-1, the hydraulic motor 4-3, and the lifting cylinder 16 all pass through the hydraulic cabin. Further, the control circuit is electrically con- nected to a display and control system through a cable. The sliding block 2-3 is provided with a displacement sensor 15 electrically connected to the control circuit. An output shaft of the hydraulic motor 4-3 is provided with an angle sensor 14 electrically connected to the control circuit.
Values detected by the sensors can be displayed in the display and control system. The attitude sensor 10 measures a real-time attitude of the bearing frame 3-1, to determine whether the attitude of the bearing frame 3-1 under water meets a measurement requirement.
The angle sensor 14 measures a real-time swing angle of the horizontal probe 5, to determine whether the horizontal probe 5 swings to a horizontal or vertical position.
The displacement sensor 15 measures a real-time insertion depth of the vertical probe.
The hydraulic motor pressure sensor 12 measures a real-time pressure of the hydraulic motor, and assists in determining whether the horizontal probe swings to a limit position.
The lifting cylinder pressure sensor 13 measures a real-time pressure of the lifting cylinder 16, to determine whether the lifting cylinder 16 is lifted or down to a limit posi-
tion.
The transmitting transducer 8 is a mosaic cylindrical transducer, is installed on the head of the horizontal probe 5, and can transmit an omnidirectional medium- and low- frequency acoustic wave with a frequency of 1-10 kHz in a radial direction.
To meet a transmission requirement of an acoustic wave in a medium- and low-frequency band, the transmitting transducer 8 adopts a ring-shaped mosaic struc- ture.
The transmitting transducer 8 is made of a plurality of piezoelectric ceramic strips and filler materials (metal splicing strips) which are bonded to form a ring.
The top and bottom of the assembled piezoelectric ceramic ring are equipped with metal cover plates.
The transmitting trans- ducer 8 can implement omnidirectional transmission in a ra- dial direction.
This ensures that the transmitting trans- ducer 8 has a good sound source level in a plane formed by a receiving hydrophone, the vertical probe 1, the horizontal probe 5, and the transmitting transducer 8. The receiving transducer 9 is a broadband hydrophone embedded in the ver- tical probe 1. A sound-transmitting window is opened at an embedded position, so that an acoustic wave can be trans- mitted to the hydrophone.
When the vertical probe 1 is in- serted, the receiving transducer 9 can be well protected by the vertical probe 1 to prevent the receiving transducer 9 from being damaged by pressure.
Two receiving transducers 9 are installed at the bottom of the vertical probe 1 at a distance. The receiving transducer 9 has a relatively large beam opening angle in a vertical direction, ensuring good receiving sensitivity in an oblique sound ray direction. The two receiving transducers 9 both receive a medium- and low- frequency acoustic wave signal from the transmitting trans- ducer 8 for test data backup, so as to obtain medium- and low-frequency acoustic properties of measured seafloor sed- iment.
Lengths of the vertical probe 1 and the horizontal probe 5 are both greater than 3 m. When the vertical probe l is inserted into the seafloor sediment to a maximum depth and the horizontal probe 5 is fully deployed to a horizontal position, a distance between the transmitting transducer 8 and each of the two receiving transducers 9 is greater than 3 m, so that a distance between receiving and transmitting is not less than two acoustic wave wavelengths (for a lowest frequency 1 kHz that can be measured by this system, an acoustic wave wavelength is about 1.5 m). This satisfies a measurement requirement of the acoustic properties of the sediment.
When the in-situ measurement system for medium- and low-frequency acoustic properties of seafloor sediments in this embodiment is in a working state, the receiving trans- ducer 9 is inserted into the sediment at a depth of 3 m, and the transmitting transducer 8 is arranged on the surface of the sediment. A connecting line between the transmitting transducer 8 and the receiving transducer 9 is an oblique line at an angle to the surface of the sediment. The entire system implements oblique measurement.
The real-time display and control system helps to im- plement a real-time operation and monitoring of the meas- urement system on a deck. The display and control system allows a measurer to: determine parameters such as an actual insertion depth of the receiving transducer 9 and a swing angle of the transmitting transducer 8 based on an actual condition of seafloor topography and an actual attitude of the bearing frame on the seafloor; determine whether the receiving transducer 9 and the transmitting transducer 8 are in place based on a real-time measurement value of each sensor; and observe an acoustic properties curve of the sediment obtained by the measurement system in real time to determine a progress of a measurement operation.
This embodiment also provides an in-situ measurement method for medium- and low-frequency acoustic properties of seafloor sediments, including the following steps: (1) Connect a deck console to a photoelectric armored cable of a photoelectric winch; connect the photoelectric armored cable of the photoelectric winch to a control cir- cuit in a control cabin 6 on a bearing platform 3; and preset a transmission parameter and an acquisition parameter in a real-time display and control system of the deck console.
{2) Through a real-time display and control unit of the deck console, debug the transmitting transducer 8, the re- ceiving transducer 9, and a signal processing module of the receiving transducer 9; debug insertion and lifting actions of the vertical probe 1 and the displacement sensor 15; debug a retracting action of the horizontal probe 5; and debug the penetrating cylinder pressure sensor 11, the hy- draulic motor pressure sensor 12, the lifting cylinder pres- sure sensor 13, the attitude sensor 10, and the angle sensor 14, (3) Lift the vertical probe 1 to a highest position, and reset a value of the displacement sensor 15 Lo zero; retract the horizontal probe 5 to a vertical state, and reset a value of the angle sensor 14 of the horizontal probe 5 to zero; and open the vertical position limit plate 4-1 of the horizontal probe 5 to ensure that the horizontal probe 5 can be retracted and released underwater.
(4) Swing a hoisting device on a mother ship and release the photoelectric armored cable, to deploy the in-situ meas- urement system into the water. During this process, the device must be stopped shaking; and during deploying the measurement system, the horizontal probe 5 is kept in a vertical storage position, to prevent an impact force from damaging the transmitting transducer 8.
(5) When the bearing platform 3 hits the seafloor, confirm whether an angle value transmitted by the attitude sensor 10 to the real-time display and control system is within an allowable range of the in-situ measurement. If the angle value transmitted by the attitude sensor 10 to the real-time display and control system is not within the al- lowable range of the in-situ measurement, lift the bearing platform 3 and repeat step (4) until an angle value trans- mitted by the attitude sensor 10 to the real-time display and control system is within the allowable range of the in- situ measurement. After confirming that the angle value transmitted by the attitude sensor 10 to the real-time dis- play and control system is within the allowable range of the in-situ measurement, turn on the penetrating cylinder 2-1 and slowly insert the vertical probe 1 into the sediment.
During this process, it is necessary to observe a real-time value of the displacement sensor 15 in the real-time display and control unit, to determine whether the vertical probe 1 is inserted in place; and observe a value of the penetrating cylinder pressure sensor 11, and when a pressure is too high, the vertical probe 1 can be repeatedly raised and lowered to reduce load of a hydraulic system. After insert- ing the vertical probe 1 in place, turn off the penetrating cylinder 2-1.
(6) Turn on the hydraulic motor 4-3 of the horizontal probe support mechanism 4. During this process, it is nec- essary to observe a real-time value that is of the angle sensor 14 of the horizontal probe 5 and that is in the real- time display and control system, and observe a value of the pressure sensor, to determine whether the transmitting transducer 8 is in contact with the seafloor sediment. The horizontal limit bracket is installed at the bottom of the bearing platform 3. When the horizontal probe 5 is swung out to a horizontal position underwater, the horizontal limit bracket provides a limit for the horizontal probe 5, so that the horizontal probe 5 can no longer continue to swing out- ward.
(7) The real-time display and control system sends a parameter and an instruction of acoustic wave transmission and acquisition to an acoustic wave transmission and acqui- sition system in the control circuit encapsulated in the control cabin 6. A transmission circuit generates a medium- and low-frequency waveform signal at a specified frequency. The signal is amplified and transmitted to the transmitting transducer 8. The transmitting transducer 8 transmits the medium- and low-frequency acoustic wave signal, which is received by the receiving transducer 9 after propagating in the sediments. Then, an acguisition circuit acquires the signal. Upload acquired data to the real-time display and control system on the ship through a photoelectric composite cable, and save the data. Further, save the acquired data in a storage unit of the acquisition circuit as a backup.
{8) After the horizontal probe support mechanism 4 is deployed, the following three states are used to comprehen- sively determining whether the transmitting transducer 8 is in contact with the sediment: (a) Whether a value of the angle sensor 14 of the horizontal probe 5 is near 90 degrees, and if yes, it means that the horizontal probe 5 is basically in a horizontal position.
(b) Whether a value of the pressure sensor of the hy- draulic motor 4-3 is too large, and if it is too large, it means that the horizontal probe 5 or the transmitting trans- ducer 8 is placed in contact with the sediment.
(c) Observe a received medium- and low-frequency acous- tic wave curve: When the transmitting transducer 8 does not reach the surface of the sediment, an acoustic wave propa- gation path is a water distance plus a sediment distance. When the horizontal probe 5 slowly rotates to the horizontal position, the water distance gradually decreases, and the sediment distance gradually increases. This reflected on the acoustic wave curve 1s that a propagation property in the water becomes gradually smaller, and a propagation property in the sediments gradually becomes larger. When the acoustic wave curve is close to stable, it indicates that the trans- mitting transducer 8 is in contact with the sediment.
When the states (a) and (b) appear but the state (¢) does not appear, it means that the horizontal probe 5 reaches the surface of the sediment, but the transmitting transducer 8 dose not reach the surface of the sediment. At this time, the lifting cylinder 16 needs to be turned on to drive the transmitting transducer 8 to move vertically downwards until the transmitting transducer comes into contact with the sed- iment. During this process, the following two states are used to comprehensively determine whether the transmitting transducer 8 is in contact with the sediment: 1) Whether a value of the lifting cylinder pressure sensor 13 is too large, and if the value is too large, it means that the transmitting transducer 8 is in contact with the sediment.
2) Observe a received medium- and low-frequency acous- tic wave curve: When the transmitting transducer 8 does not reach the surface of the sediment, an acoustic wave propa- gation path is a water distance plus a sediment distance. When the horizontal probe 5 slowly rotates to the horizontal position, the water distance gradually decreases, and the sediment distance gradually increases. This reflected on the acoustic wave curve 1s that a propagation property in the water becomes gradually smaller, and a propagation property in the sediments gradually becomes larger. When the acoustic wave curve is close to stable, it indicates that the trans- mitting transducer 8 is in contact with the sediment.
{9) When the transmitting transducer 8 is in contact with the sediment, turn off the hydraulic motor 4-3 of the horizontal probe support mechanism 4 and the lifting cylin- der 16, and start to measure the acoustic properties and observe the received acoustic wave curve to complete the acoustic measurement.
(10) After the acoustic measurement is completed, turn off an acoustic wave transmitting module and an acoustic wave receiving module, and turn on the transmitting trans- ducer 8 and the lifting cylinder 16. After the transmitting transducer 8 is lift to the zero position, turn off the transmitting transducer 8 and the lifting cylinder 16. Turn on the hydraulic motor 4-3 of the horizontal probe support mechanism 4, and then turn off the hydraulic motor 4-3 after retracting the horizontal probe 5 to the vertical position.
When the horizontal probe 5 is in the vertical position, the vertical position limit plate 4-1 fixes the horizontal probe 5 in the receiving hole. At this time, when the hydraulic motor 4-3 does not provide driving force, the horizontal probe 5 may not fall to the horizontal direction.
{11) Turn on the penetrating cylinder 2-1 and slowly lift the vertical probe 1 from the sediment. During this process, it is necessary to observe a real-time value of the displacement sensor 15 in the real-time display and control system to determine whether the vertical probe 1 is lifted in place; and observe a value of the pressure sensor, and when the pressure is too high, the vertical probe 1 is repeatedly raised and lowered to reduce load of the hydrau- lic system. When the vertical probe 1 is lifted in place, turn off the penetrating cylinder 2-1.
(12) Retract the photoelectric armored cable, retract the bearing platform 3 to the mother ship, and install the vertical position limit plate 4-1.
Specific examples are used in the specification for ilius- tration of the principles and implementations of the present disclosure. The description of the examples is used to help understand the method and its core principles of the present disclosure. In addition, those skilled in the art can make various modifications to specific implementations and ap- plication scope in accordance with the teachings of the present disclosure. In conclusion, the content of this spec- ification shall not be construed as a limitation to the present disclosure.
In figure 5 of the drawings: 50 Deck console 51 Photoelectric winch 52 Optical cable 53 Fiber transceiver 54 Signal from a penetrating cylinder pressure sensor on a vertical probe 55 Signal from a displacement sensor of vertical probe penetration 56 Inclination sensor on a bearing platform 57 Water entry and bottoming detection signal 58 Interface circuit 59 Interface board 1 60 Main control board 61 Interface board 2 62 interface circuit 63 Acoustic wave transmission and acquisition subsystem 64 Signal from an angle sensor on a horizontal probe 65 Signal from a hydraulic motor pressure sensor on a horizontal probe 66 Signal from a lifting cylinder pressure sensor on a transmitting transducer 67 Switch control of a deep water motor 68 Switch control of a movable clamping cylinder 69 Switch control of a fixed clamping cylinder 70 Switch control of vertical probe penetration 71 Lift control of a vertical probe 72 Switch control of hydraulic motor on a horizontal probe 73 Control of a lifting cylinder on a transmitting trans- ducer

Claims (8)

CONCLUSIESCONCLUSIONS 1. Een in-situ meetsysteem voor midden- en laagfrequente akoestische eigenschappen van zeebodem- sedimenten, dat een draagframe omvat, waarbij het draagframe is voorzien van een besturingskast, een hydraulische kast, een verticaal sonde-penetratiemechanisme, en een horizontaal sonde-ondersteuningsmechanisme; waarbij het verticale sonde-mechanisme een verticale geleiderail bevestigd op het draagframe omvat, waarbij de bovenzijde van de geleiderail vast voorzien is van een penetrerende-cilinder, waarbij een cilinderstang van de penetrerende-cilinder vast verbonden is aan een glijblok, waarbij het glijblok glijdend samen werkt met de geleiderail, waarbij het glijblok vast voorzien is van een beweegbare klemcilinder, waarbij de onderzijde van de geleiderail vast is voorzien van een vaste klemcilinder, waarbij de beweegbare klemcilinder en de vaste klemcilinder eenzelfde verticale sonde klemmen, waarbij de onderzijde van de verticale sonde vast is voorzien van twee ontvangende-transducers die verticaal op afstand van elkaar staan, en waarbij de penetrerende-cilinder de verticale sonde kan aandrijven om te hijsen; waarbij het horizontale sonde-ondersteunings- mechanisme een aandrijfinrichting bevestigd op het draagframe omvat, waarbij een uitvoeras van de aandrijfinrichting loodrecht is en vast verbonden aan één uiteinde van een horizontale sonde, waarbij de aandrijfinrichting de horizontale sonde kan aandrijven om te roteren met de uitvoeras als een centrale as, waarbij het andere uiteinde van de horizontale sonde is voorzien van een uitzendende- transducer, waarbij de uitzendende-transducer een midden- en laagfrequente akoestische golf uitzendende-transducer is, en waarbij de ontvangende-transducer een midden- en laagfreguentie akoestische golf kan ontvangen; en waarbij de besturingskast voorzien is van een besturingsschakeling, waarbij de hydraulische kast is voorzien van een penetrerende-cilinder-druksensor die elektrisch verbonden is met de besturingsschakeling, en waarbij de besturingsschakeling elektrisch verbonden is met een display en besturingssysteem via een kabel.An in-situ measurement system for medium and low frequency acoustic properties of seabed sediments, comprising a support frame, the support frame including a control box, a hydraulic box, a vertical probe penetration mechanism, and a horizontal probe support mechanism; wherein the vertical probe mechanism comprises a vertical guide rail mounted on the cradle, the top of the guide rail being rigidly provided with a penetrating cylinder, a cylinder rod of the penetrating cylinder being rigidly connected to a slide block, the slide block sliding together works with the guide rail, wherein the sliding block is fixedly provided with a movable clamping cylinder, whereby the underside of the guide rail is rigidly provided with a fixed clamping cylinder, wherein the movable clamping cylinder and the fixed clamping cylinder clamp the same vertical probe, whereby the underside of the vertical probe rigidly provided with two receiving transducers spaced vertically from each other, and wherein the penetrating cylinder is capable of driving the vertical probe for lifting; wherein the horizontal probe support mechanism includes a driver mounted on the cradle, an output shaft of the driver being perpendicular and rigidly connected to one end of a horizontal probe, the driver being able to drive the horizontal probe to rotate with the output shaft as a center axis, the other end of the horizontal probe having a transmitting transducer, the emitting transducer being a mid and low frequency acoustic wave emitting transducer, and the receiving transducer being a mid and low frequency acoustic wave can receive; and wherein the control box includes a control circuit, the hydraulic box including a penetrating cylinder pressure sensor electrically connected to the control circuit, and the control circuit electrically connected to a display and control system via a cable. 2. Het in-situ meetsysteem voor midden- en laagfrequente akoestische eigenschappen van zeebodem- sedimenten volgens conclusie 1, waarbij de horizontale sonde verder is voorzien van een hijscilinder, waarbij een cilinderstaaf van de hijscilinder loodrecht is op de horizontale sonde, waarbij de uitzendende-transducer vast is verbonden met de cilinderstaaf van de hijscilinder, en de hijscilinder de uitzendende-transducer kan aandrijven om te hijsen.The in-situ medium and low frequency acoustic properties measurement system of seabed sediments according to claim 1, wherein the horizontal probe further comprises a lifting cylinder, wherein a cylinder bar of the lifting cylinder is perpendicular to the horizontal probe, the emitting transducer is fixedly connected to the cylinder rod of the hoisting cylinder, and the hoisting cylinder can drive the emitting transducer to hoist. 3. Het in-situ meetsysteem voor midden- en laagfrequente akoestische eigenschappen van zeebodem- sedimenten volgens conclusie 2, waarbij het horizontale sonde-ondersteuningsmechanisme verder een horizontale positie-limiet-beugel en een verticale positie-limiet-plaat omvat, waarbij de aandrijfinrichting een hydraulische motor is, waarbij de horizontale positie-limiet-beugel bevestigd is op het draagframe, en waarbij de hydraulische motor is bevestigd op de horizontale positie-limiet-beugel; en waarbij de bovenzijde van het draagframe is voorzien van een ontvangend-gat overeenkomend met de horizontale sonde, waarbij het ontvangend-gat voorzien is van een inkeping, waarbij, wanneer in een verticale toestand, de horizontale sonde door het ontvangend-gat passeert, en de verticale positie-limiet-plaat verwijderbaar gemonteerd is bij de inkeping door gebruik te maken van een bout.The in-situ medium and low frequency acoustic properties measurement system of seabed sediments according to claim 2, wherein the horizontal probe support mechanism further comprises a horizontal position limit bracket and a vertical position limit plate, the driver having a is a hydraulic motor, wherein the horizontal position limit bracket is mounted on the cradle, and the hydraulic motor is mounted on the horizontal position limit bracket; and wherein the top of the cradle is provided with a receiving hole corresponding to the horizontal probe, the receiving hole having a notch, wherein, when in a vertical state, the horizontal probe passes through the receiving hole, and the vertical position limit plate is removably mounted at the notch using a bolt. 4. Het in-situ meetsysteem voor midden- en laagfrequente akoestische eigenschappen van zeebodem- sedimenten volgens conclusie 3, waarbij de hydraulische kast luchtdicht is, en de hydraulische kast verder is voorzien van een penetrerende-cilinder-druksensor, een hydraulische- motor-druksensor, en een hijscilinder-druksensor die afzonderlijk elektrisch verbonden zijn met de besturingsschakeling; waarbij de besturingskast afgedicht is, en de besturingskast verder is voorzien van een standsensor die elektrisch verbonden is met de besturingsschakeling, en het glijblok is voorzien van een verplaatsingssensor die elektrisch verbonden is met de besturingsschakeling, en waarbij een uitvoeras van de hydraulische motor is voorzien van een hoeksensor die elektrisch verbonden is met de besturingsschakeling.The in-situ measurement system for medium and low frequency acoustic properties of seabed sediments according to claim 3, wherein the hydraulic box is airtight, and the hydraulic box further comprises a penetrating cylinder pressure sensor, a hydraulic motor pressure sensor. , and a hoisting cylinder pressure sensor separately electrically connected to the control circuit; wherein the control box is sealed, and the control box further includes a position sensor electrically connected to the control circuit, and the sliding block is provided with a displacement sensor electrically connected to the control circuit, and an output shaft of the hydraulic motor is provided with an angle sensor that is electrically connected to the control circuit. 5. Het in-situ meetsysteem voor midden- en laagfrequente akoestische eigenschappen van zeebodem- sedimenten volgens conclusie 1, waarbij de onderzijde van het draagframe is voorzien van een veelvoud van voeten, waarbij de bovenzijde van het draagframe is voorzien van een hijsring, en waarbij het draagframe, de hijsring en de voeten een draagplatform vormen.The in-situ measurement system for medium and low frequency acoustic properties of seabed sediments according to claim 1, wherein the bottom of the support frame is provided with a plurality of feet, the top of the support frame is provided with a hoisting ring, and wherein the support frame, the hoisting ring and the feet form a support platform. 6. Het in-situ meetsysteem voor midden- en laagfrequente akoestische eigenschappen van zeebodem- sedimenten volgens conclusie 1, waarbij de uitzendende- transducer elektrisch verbonden is met een akoestische golf uitzendende schakeling in de besturingsschakeling, en waarbij de ontvangende-transducer elektrisch verbonden is met een akoestische golf ontvangende schakeling in de besturings- schakeling.The in-situ medium and low frequency acoustic properties measurement system of seabed sediments according to claim 1, wherein the emitting transducer is electrically connected to an acoustic wave emitting circuit in the control circuit, and wherein the receiving transducer is electrically connected to an acoustic wave receiving circuit in the control circuit. 7. Een in-situ meetmethode voor midden- en laagfrequente akoestische eigenschappen van zeebodem- sedimenten, op basis van het in-situ meetsysteem voor midden- en laagfrequente akoestische eigenschappen van zeebodem- sedimenten volgens één van de conclusies 1 - 6, en omvattende de volgende stappen: (1) het elektrisch verbinden van de besturingsschakeling in de besturingskast met een real-time display en besturingseenheid van een dekconsole;An in-situ measurement method for medium and low frequency acoustic properties of seabed sediments, based on the in-situ measurement system for medium and low frequency acoustic properties of seabed sediments according to any one of claims 1 to 6, and comprising the following steps: (1) electrically connecting the control circuit in the control box to a real-time display and control unit of a deck console; (2) het terugtrekken van de horizontale sonde naar een verticale toestand door gebruik te maken van de real-time display en besturingseenheid, en het openen van de verticale positie-limietplaat om te verzekeren dat de horizontale sonde kan worden teruggetrokken en losgelaten onder water;(2) retracting the horizontal probe to a vertical state using the real-time display and control unit, and opening the vertical position limit plate to ensure that the horizontal probe can be retracted and released underwater; {3} het in water inzetten van het in-situ meetsysteem door gebruik te maken van een hijsinrichting totdat het draagplatform de zeebodem raakt, waarbij, na geplaatst te zijn boven het zeebodem sediment, het in-situ meetsystem niet verder kan zinken; en waarbij, tijdens een inzet-proces, de horizontale sonde in een verticale toestand wordt gehouden;{3} deploying the in-situ measurement system in water by using a hoisting device until the support platform touches the seabed, whereby, after being placed above the seabed sediment, the in-situ measurement system cannot sink further; and wherein, during a deployment process, the horizontal probe is held in a vertical state; (4) het aandrijven van de verticale sonde om naar beneden te bewegen door gebruik te maken van de penetrerende- cilinder totdat de ontvangende-transducer op de bodemzijde van de verticale sonde is gelegen op een vooraf bepaalde diepte in het zeebodem-sediment; en het aandrijven van de horizontale sonde naar een horizontale toestand door gebruik te maken van de hydraulische motor;(4) driving the vertical probe to move down using the penetrating cylinder until the receiving transducer is located on the bottom side of the vertical probe at a predetermined depth in the seabed sediment; and driving the horizontal probe to a horizontal state using the hydraulic motor; {5) het sturen, door het real-time display en besturingssysteem, van een akoestische golf transmissie en acquisitieparameter en instructie naar een akoestische golftransmissie en acquisitiesysteem in de besturingsschakeling dat is ingekapseld in de besturingskast; het uitzenden, door de wverzendende-transducer, van een midden- en laagfrequente akoestisch golfsignaal; en het ontvangen, door de ontvangende-transducer, van het midden- en laagfreguente akoestisch golfsignaal, en het uploaden van de verkregen gegevens naar het real-time display en besturingssysteem;{5) sending, through the real-time display and control system, an acoustic wave transmission and acquisition parameter and instruction to an acoustic wave transmission and acquisition system in the control circuit encapsulated in the control box; transmitting, by the transmitting transducer, a medium and low frequency acoustic wave signal; and receiving, by the receiving transducer, the mid and low frequency acoustic wave signal, and uploading the acquired data to the real-time display and control system; {6) het terugbrengen van de horizontale sonde naar een verticale toestand door gebruik te maken van de hydraulische motor, en het aandrijven van de verticale sonde om omhoog te bewegen door gebruik te maken van de penetrerende-cilinder tot de verticale sonde op een originele positie terugkomt; en (7) het terugtrekken van het in-situ meetsystem naar een moederschip door gebruik te maken van de hijsinrichting.{6) returning the horizontal probe to a vertical state using the hydraulic motor, and driving the vertical probe to move upward using the penetrating cylinder to the vertical probe at an original position come back; and (7) withdrawing the in-situ measurement system to a mother ship using the hoist. 8. De in-situ meetmethode voor midden- en laagfrequente akoestische eigenschappen van zeebodem- sedimenten volgens conclusie 7, waarbij in stap (4), wanneer de penetrerende-cilinder de verticale sonde niet kan aandrijven naar de vooraf bepaalde diepte in één keer, de verticale sonde aangedreven wordt door de penetrerende- cilinder om meerdere inbrengacties uit te voeren totdat de ontvangende-transducer op de onderzijde van de verticale sonde zich bevindt op de vooraf bepaalde diepe in de zeebodem- sedimenten. -0-0-0-0-0-0-0-0-The in-situ measurement method for medium and low frequency acoustic properties of seabed sediments according to claim 7, wherein in step (4), when the penetrating cylinder cannot drive the vertical probe to the predetermined depth at one time, the vertical probe is driven by the penetrating cylinder to perform multiple insertion actions until the receiving transducer on the bottom of the vertical probe is at the predetermined deep seabed sediments. -0-0-0-0-0-0-0-0-
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