Submarine sediment in-situ low-frequency acoustic measurement system and method

Abstract

The invention discloses a submarine sediment in-situ low-frequency acoustic measurement system and method. The in-situ low-frequency acoustic measurement system for the seabed sediment comprises a mother ship, a control center, an umbilical cable, a low-frequency sound source transmitting host, a drill rod and a self-contained acoustic receiver, when the low-frequency sound source emission host controls the drill rod to drill into a target detection stratum, the self-contained acoustic receiver is put into the drill rod, after the drill rod clamps the self-contained acoustic receiver, the self-contained acoustic receiver is pressed into the target detection stratum, and the drill rod is used for drilling seabed sediments; the low-frequency sound source transmitting host is used for transmitting sound wave signals with different frequencies, and the self-contained acoustic receiver processes and converts the received sound wave signals with different frequencies into data and stores the data; the control center reads data measured by the self-contained acoustic receiver and analyzes the data to obtain sound velocity and sound attenuation of the seabed sediment at different frequencies. According to the invention, the accuracy of ocean sediment acoustic measurement can be improved, and the frequency range of ocean sediment acoustic measurement is increased.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of acoustic measurement technology, and in particular to an in-situ low-frequency acoustic measurement system and method for seabed sediments. Background Art

[0002] At present, there are two methods for measuring the acoustics of seabed sediments: in-situ measurement and laboratory measurement. Laboratory measurement is to obtain sediments from the seabed and measure the acoustic parameters of the sediments in the laboratory. In terms of in-situ measurement, direct measurement is generally adopted by penetrating the formation. For example, the disclosed patents 202120961087.4 and 202310834887.3 both use gravity penetration for direct measurement. These measurement schemes are more accurate than laboratory measurements. However, the depth of gravity penetration into the formation is limited, generally not exceeding 5 meters. Therefore, generally only medium to high-frequency acoustic measurements can be made. Patent 202211594471.0 proposes a low-frequency bottom acoustic measurement scheme, but this scheme has no specific implementation method and cannot ensure measures to penetrate to the exact depth of the formation; in addition, the transmitting sensor frequency is greater than 1kHz, which cannot meet the needs of detecting lower-frequency acoustic parameters.

[0003] Laboratory measurements are separated from the original formation environment and introduce unpredictable variables from the beginning of sampling. Physical properties such as sample disturbance, temperature, and pressure have all changed, and the measured acoustic data deviates from the true value.

[0004] Existing in-situ measurement methods have insufficient penetration depth and can only achieve medium to high-frequency acoustic measurements. The limit measurement frequency of acoustic measurement is related to the distance between the sensor and the receiver. The greater the distance, the lower the frequency of achievable acoustic measurement. Although the low-frequency acoustic characteristics of sediments can be calculated using theoretical models based on the high-frequency acoustic characteristics, in actual applications, since sediments in the marine environment are porous, the liquid and solid phases vibrate differently under the excitation of sound waves, and the sound velocity and attenuation in the sediments vary with frequency. However, fluid or (visco)elastic body theory is based on single-phase systems and assumes that the sound velocity and attenuation do not vary with frequency. Therefore, it is not suitable for theoretical predictions of sound velocity and attenuation in sediments. Therefore, actual measurements of the low-frequency acoustic characteristics of seabed sediments are more accurate than theoretical calculations, and the current seabed sediment acoustic measurement scheme cannot meet the needs of low-frequency acoustic measurements.

[0005] In summary, the existing ocean bottom acoustic measurement technology has problems such as inaccuracy, depth limitation and low enough limit frequency. Summary of the Invention

[0006] The present invention provides an in-situ low-frequency acoustic measurement system and method for seabed sediments, which improves the accuracy of ocean bottom acoustic measurement and increases the frequency range of seabed sediment acoustic measurement.

[0007] According to one aspect of the present invention, a low-frequency acoustic measurement system for in-situ seabed sediments is provided. The low-frequency acoustic measurement system for in-situ seabed sediments comprises: a mother ship, a control center, an umbilical cable, a low-frequency sound source transmitter host, a drill pipe, and a self-contained acoustic receiver;

[0008] The control center is arranged on the mother ship and connected to the umbilical cable, and the control center is used to control the low-frequency sound source transmitting host and the self-contained acoustic receiver;

[0009] The umbilical cable is connected to the low-frequency sound source transmitting host, and the control center communicates and supplies power to the low-frequency sound source transmitting host through the umbilical cable;

[0010] The low-frequency sound source transmitting host is connected to the self-contained acoustic receiver via the drill rod. When the low-frequency sound source transmitting host controls the drill rod to drill into the target detection formation, the self-contained acoustic receiver is inserted into the drill rod. After the drill rod clamps the self-contained acoustic receiver, the self-contained acoustic receiver is pressed into the target detection formation. The drill rod is used to drill into seabed sediments.

[0011] The low-frequency sound source transmitting host is leveled on the seabed and closely attached to the seabed sediment, and is used to transmit sound wave signals of different frequencies. The self-contained acoustic receiver processes the received sound wave signals of different frequencies into data and stores the data.

[0012] The control center reads the data measured by the self-contained acoustic receiver, and obtains the sound velocity and sound attenuation of the seabed sediment at different frequencies after analyzing the data.

[0013] Optionally, the low-frequency sound source transmitting host includes: a submarine hydraulic drilling system, a sound source bracket and a low-frequency sound source;

[0014] The sound source bracket is mounted on a frame of the submarine hydraulic drilling system located above the seabed surface. The submarine hydraulic drilling system is used to control the drill pipe to drill into the target detection formation, insert the self-contained acoustic receiver into the drill pipe, and after the drill pipe clamps the self-contained acoustic receiver, press the self-contained acoustic receiver into the target detection formation.

[0015] The low-frequency sound source is installed on the sound source bracket, the low-frequency sound source is close to the seabed sediment, and the low-frequency sound source is used to emit sound wave signals of different frequencies.

[0016] Optionally, the subsea hydraulic drilling system comprises: a feeding mechanism, a rotating mechanism, a clamping mechanism, a storage unit, a transfer unit, and a receiver recovery device;

[0017] The storage unit is used to store the drill rod, and the feeding mechanism is used to lift the rotating mechanism;

[0018] The transfer unit is used to grab the drill rod from the storage unit and transfer it to the center position of the rotating mechanism;

[0019] The rotating mechanism is connected to the drill rod transported by the transfer unit, the rotating mechanism drives the drill rod to rotate, the feeding mechanism feeds downward stably, and the drill rod drills into the formation;

[0020] When the feeding mechanism reaches the end of its stroke, the clamping mechanism clamps the drill rod, the rotating mechanism is disconnected from the drill rod, and the feeding mechanism lifts the rotating mechanism to the highest position, transfers and connects the remaining drill rods, and repeats the drilling process;

[0021] The receiver recovery device is used to recover the self-contained acoustic receiver after completing the acoustic measurement.

[0022] Optionally, the self-contained acoustic receiver includes: a salvage recovery component, a measurement and control cabin, and a frequency receiver;

[0023] The salvage and recovery component is connected to the measurement and control cabin, and the measurement and control cabin is connected to the frequency receiver. The frequency receiver is used to convert the received sound wave signals of different frequencies into electrical signals and transmit them to the measurement and control cabin. The measurement and control cabin is used to convert the electrical signals into data and store them. The salvage and recovery component is used to recover the self-contained acoustic receiver after completing the acoustic measurement.

[0024] Optionally, the measurement and control cabin includes: a DC power signal processing circuit and a data storage circuit;

[0025] The DC power supply is connected to the signal processing circuit and the data storage circuit, and the DC power supply is used to provide power to the signal processing circuit and the data storage circuit;

[0026] The signal processing circuit is connected to the data storage circuit. The signal processing circuit is used to convert the electrical signal into data and transmit the data to the data storage circuit. The data storage circuit is used to store the data.

[0027] Optionally, the frequency receiver includes at least: a first receiver, a second receiver and a third receiver;

[0028] The signal processing circuit is connected to the first receiver, the second receiver and the third receiver. The first receiver, the second receiver and the third receiver are used to convert received sound wave signals of different frequencies into electrical signals and transmit them to the signal processing circuit.

[0029] Optionally, the probe of the self-contained acoustic receiver is replaced according to a receiving frequency, and the frequency is less than or equal to 10 Hz.

[0030] According to another aspect of the present invention, a method for in-situ low-frequency acoustic measurement of seabed sediments is provided. The method is applied to the in-situ low-frequency acoustic measurement system for seabed sediments in the above aspect. The method comprises:

[0031] When the low-frequency sound source transmitting host controls the drill rod to drill into the target detection formation, the self-contained acoustic receiver is inserted into the drill rod, and after the drill rod clamps the self-contained acoustic receiver, the self-contained acoustic receiver is pressed into the target detection formation;

[0032] The low-frequency sound source transmitting host is leveled on the seabed and closely attached to the seabed sediment, and the low-frequency sound source transmitting host transmits sound wave signals of different frequencies, and the self-contained acoustic receiver processes the received sound waves of different frequencies into data and stores the data;

[0033] After completing the acoustic measurement, the self-contained acoustic receiver, the drill pipe, and the low-frequency sound source transmitter are recovered to the deck of the mother ship. The control center reads the data measured by the self-contained acoustic receiver and obtains the sound velocity and sound attenuation of the seabed sediment at different frequencies after analyzing the data.

[0034] According to another aspect of the present invention, an electronic device is provided, comprising:

[0035] one or more processors;

[0036] a memory for storing one or more programs;

[0037] When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any embodiment of the present invention.

[0038] According to another aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method according to any embodiment of the present invention is implemented.

[0039] The technical solution of the embodiment of the present invention provides an in-situ low-frequency acoustic parameter synchronous measurement system for deep-sea seabed sediments in the ocean. The in-situ low-frequency acoustic measurement system for seabed sediments overcomes the shortcomings of existing equipment that cannot measure the low-frequency acoustic characteristics of seabed sediments and directly measures the low-frequency acoustic characteristics of seabed sediments. The low-frequency sound source transmitting host is not restricted by complex strata and can assist in sending the sound to a self-contained acoustic receiver to a greater depth, thereby increasing the sending and receiving distance of the acoustic measurement and reducing the effective limit frequency of the acoustic measurement to 10Hz. The self-contained acoustic receiver has a modular design and the probe receiving frequency can be replaced as needed. The solution of the present invention meets the needs of low-frequency acoustic measurement, improves the accuracy of ocean bottom acoustic measurement, and increases the frequency range of seabed sediment acoustic measurement. In summary, the present invention solves the problems of inaccurate measurement, insufficient depth measurement, and insufficient limit frequency of existing ocean bottom acoustic measurement technologies.

[0040] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 1 is a schematic structural diagram of an in-situ low-frequency acoustic measurement system for seabed sediments provided according to an embodiment of the present invention;

[0043] Figure 2 This is a structural diagram of a low-frequency sound source transmitting host provided according to an embodiment of the present invention;

[0044] Figure 3 This is a structural diagram of a submarine hydraulic drilling system provided according to an embodiment of the present invention;

[0045] Figure 4 is a structural schematic diagram of a self-contained acoustic receiver provided according to an embodiment of the present invention;

[0046] Figure 5 This is a flow chart of a method for in-situ low-frequency acoustic measurement of seabed sediments provided according to an embodiment of the present invention;

[0047] Figure 6 is a structural diagram of an electronic device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0049] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0050] Figure 1 is a schematic structural diagram of an in-situ low-frequency acoustic measurement system for seabed sediments according to an embodiment of the present invention, with reference to Figure 1 The embodiment of the present invention provides an in-situ low-frequency acoustic measurement system for seabed sediments, which includes: a mother ship 10, a control center 20, an umbilical cable 30, a low-frequency sound source transmitter host 40, a drill pipe 50, and a self-contained acoustic receiver 60;

[0051] The control center 20 is arranged on the mother ship 10 and connected to the umbilical cable 30. The control center 20 is used to control the low-frequency sound source transmitting host 40 and the self-contained acoustic receiver 60;

[0052] The umbilical cable 30 is connected to the low-frequency sound source transmitting host 40, and the control center 20 communicates with the low-frequency sound source transmitting host 40 and supplies power through the umbilical cable 30;

[0053] The low-frequency sound source transmitter host 40 is connected to the self-contained acoustic receiver 60 through the drill rod 50. When the low-frequency sound source transmitter host 40 controls the drill rod 50 to drill into the target detection formation, the self-contained acoustic receiver 60 is inserted into the drill rod 50. After the drill rod 50 clamps the self-contained acoustic receiver 60, the self-contained acoustic receiver 60 is pressed into the target detection formation. The drill rod 50 is used to drill into the seabed sediment.

[0054] The low-frequency sound source transmitter host 40 is leveled on the seabed and close to the seabed sediments, and is used to transmit sound wave signals of different frequencies. The self-contained acoustic receiver 60 processes the received sound wave signals of different frequencies into data and stores them;

[0055] The control center 20 reads the data measured by the self-contained acoustic receiver 60 and obtains the sound velocity and sound attenuation of the seabed sediment at different frequencies after analyzing the data.

[0056] Specifically, the mother vessel 10 carries the entire in-situ low-frequency acoustic measurement system for seafloor sediments, while the control center 20 integrates the system's control and data acquisition. The drill pipe 50 is driven by a hydraulic cylinder and equipped with a high-precision displacement sensor to measure the drilling depth of the drill pipe 50 in real time during drilling. The drill pipe 50 is a hollow metal tube with a male and female thread at each end. It is part of the low-frequency acoustic source transmitter 40 and is used to drill into seafloor sediments. A self-contained acoustic receiver 60 receives acoustic signals of different frequencies.

[0057] During operation, the mother vessel 10 is dynamically positioned at the designated location. The self-contained acoustic receiver 60 is connected to the control center 30 via a cable, and the clocks of the two are synchronized. The self-contained acoustic receiver 60 is then mounted on the low-frequency acoustic source transmitter 40. The low-frequency acoustic source transmitter 40, carrying the drill pipe 50 and the self-contained acoustic receiver 60, is then released to the seafloor via the umbilical cable 30. The low-frequency acoustic source transmitter 40 is then leveled on the seafloor and secured to the seafloor sediment using hydraulically driven brackets.

[0058] The drilling mechanism in the low-frequency sound source transmitter host 40 drives the drill rod 50 to start drilling towards the target detection formation, transports and connects multiple drill rods 50, and repeats the drilling. This reciprocating drilling operation enables the drill rod 50 to drill to a great depth. When the drill rod 50 drills into the target detection formation, a self-contained acoustic receiver 60 is inserted into the drill rod 50. After the drill rod 50 clamps the self-contained acoustic receiver 60, the seabed hydraulic drilling system 41 presses the self-contained acoustic receiver 60 into the target detection formation. The low-frequency sound source transmitter host 40 is not restricted by complex formations and can assist in delivering the self-contained acoustic receiver 60 to a greater depth, thereby increasing the transmitting and receiving distance of the acoustic measurement and reducing the acoustic measurement limit frequency to 10Hz.

[0059] After stabilizing, the low-frequency sound source transmitter 40 is hydraulically driven to contact the seabed and emit sound waves of varying frequencies. These waves penetrate the seabed sediment and reach the self-contained acoustic receiver 60, where they are converted into electrical signals. The electrical signals are then converted into data and stored. The self-contained receiver 60 can be connected to a different connector depending on the receiving frequency, with frequencies as low as 10 Hz.

[0060] After the acoustic measurement is completed, the self-contained acoustic receiver 60, drill pipe 50, and low-frequency sound source transmitter 40 are retrieved and returned to the deck of the mother ship 10. The self-contained acoustic receiver 60 is connected to the control center 20 via the umbilical cable 30 to read the measurement data. Through data analysis, the sound velocity and sound attenuation of the seabed sediment at different frequencies can be obtained. This overcomes the shortcoming of existing equipment that cannot measure the low-frequency acoustic characteristics of seabed sediments and directly measures the low-frequency acoustic characteristics of seabed sediments.

[0061] The technical solution of the embodiment of the present invention provides an in-situ low-frequency acoustic parameter synchronous measurement system for deep-sea seabed sediments in the ocean. The in-situ low-frequency acoustic measurement system for seabed sediments overcomes the shortcomings of existing equipment that cannot measure the low-frequency acoustic characteristics of seabed sediments and directly measures the low-frequency acoustic characteristics of seabed sediments. The low-frequency sound source transmitting host is not restricted by complex strata and can assist in sending the sound to a self-contained acoustic receiver to a greater depth, thereby increasing the sending and receiving distance of the acoustic measurement and reducing the effective limit frequency of the acoustic measurement to 10Hz. The self-contained acoustic receiver has a modular design and the probe receiving frequency can be replaced as needed. The solution of the present invention meets the needs of low-frequency acoustic measurement, improves the accuracy of ocean bottom acoustic measurement, and increases the frequency range of seabed sediment acoustic measurement. In summary, the present invention solves the problems of inaccurate measurement, insufficient depth measurement, and insufficient limit frequency of existing ocean bottom acoustic measurement technologies.

[0062] Figure 2 This is a schematic diagram of the structure of a low-frequency sound source transmitting host provided according to an embodiment of the present invention, with reference to Figure 1 and Figure 2 Optionally, the low-frequency sound source transmitting host 40 includes: a submarine hydraulic drilling system 41, a sound source bracket 42 and a low-frequency sound source 43;

[0063] The sound source bracket 42 is mounted on a frame of a submarine hydraulic drilling system 41 located above the seabed. The submarine hydraulic drilling system 41 is used to control the drill pipe 50 to drill into the target detection formation, insert the self-contained acoustic receiver 60 into the drill pipe 50, and after the drill pipe 50 clamps the self-contained acoustic receiver 60, press the self-contained acoustic receiver 60 into the target detection formation.

[0064] The low-frequency sound source 43 is installed on the sound source bracket 42. The low-frequency sound source 43 is close to the seabed sediment. The low-frequency sound source 43 is used to emit sound wave signals of different frequencies.

[0065] Specifically, the drill rod 50 is part of a subsea hydraulic drilling system 41, used for drilling into seabed sediments. A low-frequency sound source 43 is articulated to the subsea hydraulic drilling system 41 via a sound source bracket 42. Once the subsea hydraulic drilling system 41 is stabilized, it is hydraulically driven to contact the seabed. The acoustic receiver is self-contained and requires no cables to connect it to the subsea hydraulic drilling system, making operation more convenient.

[0066] When drilling reaches the target formation, a self-contained acoustic receiver 60 is inserted into the drill pipe 50. After the drill pipe 50 secures the receiver, the subsea hydraulic drilling system 41 presses the receiver into the target formation. Using the subsea hydraulic drilling system 41 to insert the receiver increases the acoustic measurement transmission and reception distance, reducing the acoustic measurement limit frequency to 10 Hz.

[0067] The low-frequency sound source 43 emits sound wave signals of different frequencies. The sound wave signals penetrate the seabed sediments and reach the self-contained acoustic receiver 60, where they are converted into electrical signals. The electrical signals are then converted into data and stored. After the acoustic measurement is completed, the self-contained acoustic receiver 60, the drill pipe 50, and the low-frequency sound source transmitter 40 are recovered to the deck of the mother ship 10. The self-contained acoustic receiver 60 is connected to the control center 20 via the umbilical cable 30 to read the measurement data. Through data analysis, the sound velocity and sound attenuation of the seabed sediments at different frequencies can be obtained. The above-mentioned self-contained receiver 60 can replace the connector according to the receiving frequency, and the receiving frequency can be as low as 10Hz.

[0068] Figure 3 is a structural diagram of a submarine hydraulic drilling system provided according to an embodiment of the present invention, with reference to Figure 1 and Figure 3 , Optionally, the submarine hydraulic drilling system 41 includes: a feeding mechanism 411, a rotating mechanism 412, a clamping mechanism 413, a storage unit 414, a transfer unit 415, and a receiver recovery device 416;

[0069] The storage unit 414 is used to store the drill rod 50, and the feeding mechanism 411 is used to elevate the rotating mechanism 412;

[0070] The transfer unit 415 is used to grab the drill rod 50 from the storage unit 414 and transfer it to the center position of the rotating mechanism 412;

[0071] The rotating mechanism 412 is connected to the drill rod 50 transported by the transfer unit 415. The rotating mechanism 412 drives the drill rod 50 to rotate, and the feeding mechanism 411 feeds the drill rod 50 downward steadily, so that the drill rod 50 drills into the formation.

[0072] When the feeding mechanism 411 reaches the end of its stroke, the clamping mechanism 413 clamps the drill rod, the rotating mechanism 412 is disconnected from the drill rod 50, and the feeding mechanism 411 lifts the rotating mechanism 412 to the highest position, transfers and connects the remaining drill rods, and repeats the drilling process.

[0073] The receiver recovery device 416 is used to recover the self-contained acoustic receiver 60 after completing the acoustic measurement.

[0074] Specifically, the submarine hydraulic drilling system 41 is as follows Figure 3As shown, it is composed of a feeding mechanism 411, a rotating mechanism 412, a clamping mechanism 413, a storage unit 414, a transfer unit 415, a receiver recovery device 416, etc., and can provide functions such as drill rod rotation, drill rod feeding, drill rod connection, drill rod storage, and self-contained acoustic receiver 60 recovery.

[0075] When the submarine hydraulic drilling system 41 begins drilling, the feed mechanism 411 raises the rotary mechanism 412 to its highest position; the transfer unit 415 grabs the drill rod 50 (with the drill bit installed at the head of the first drill rod) from the storage unit 414 and transfers it to the center of the rotary mechanism 412; the rotary mechanism 412 connects to the drill rod 50 delivered by the transfer unit 415; the rotary mechanism 412 drives the drill rod 50 to rotate, and the feed mechanism 411 feeds it downward steadily, and the drill rod 50 drills into the formation. When the feed mechanism 411 reaches the end of its stroke, the clamping mechanism 413 clamps the drill rod 50, and the rotary mechanism 412 disengages the drill rod 50. The feed mechanism 411 raises the rotary mechanism 412 to its highest position, transfers and connects the drill rod, and repeats the drilling process. The above steps are repeated in this way to achieve deep drilling of the drill rod. Because the length of the drill rod is known, the feed mechanism 411 is equipped with a displacement sensor to accurately calculate the position of the drill bit.

[0076] Unrestricted by complex strata, the submarine hydraulic drilling system 41 assists in delivering self-contained acoustic receivers to greater depths, extending the acoustic measurement transmission and reception range and reducing the effective limit frequency of acoustic measurement to 10 Hz. This overcomes the shortcomings of existing equipment in measuring the low-frequency acoustic characteristics of seabed sediments and allows direct measurement of these low-frequency acoustic characteristics.

[0077] Figure 4 is a schematic structural diagram of a self-contained acoustic receiver according to an embodiment of the present invention, with reference to Figure 4 Optionally, the self-contained acoustic receiver 60 includes: a salvage recovery component 61, a measurement and control cabin 62, and a frequency receiver 63;

[0078] The salvage and recovery component 61 is connected to the measurement and control cabin 62, and the measurement and control cabin 62 is connected to the frequency receiver 63. The frequency receiver 63 is used to convert the received sound wave signals of different frequencies into electrical signals and transmit them to the measurement and control cabin 62. The measurement and control cabin 62 is used to convert the electrical signals into data and store them. The salvage and recovery component 61 is used to recover the self-contained acoustic receiver after completing the acoustic measurement.

[0079] Specifically, the self-contained acoustic receiver 60 is used to receive acoustic signals and consists of a salvage and recovery assembly 61, a measurement and control cabin 62, and a frequency receiver 63. The salvage and recovery assembly 61 works in conjunction with the receiver recovery device in the subsea hydraulic drilling system. After completing the acoustic measurement, the salvage and recovery assembly 61 recovers the self-contained acoustic receiver, the drill pipe, and the low-frequency sound source transmitter to the deck of the mother ship. The self-contained acoustic receiver utilizes a self-contained design, eliminating the need for cables connecting it to the subsea hydraulic drilling system, making operation more convenient.

[0080] Optionally, the measurement and control cabin includes: a DC power signal processing circuit and a data storage circuit;

[0081] The DC power supply is connected to the signal processing circuit and the data storage circuit, and is used to provide power to the signal processing circuit and the data storage circuit;

[0082] The signal processing circuit is connected to the data storage circuit. The signal processing circuit is used to convert the electrical signal into data and transmit the data to the data storage circuit. The data storage circuit is used to store the data.

[0083] Continue to refer Figure 4 , optionally, the frequency receiver 63 at least includes: a first receiver 631 , a second receiver 632 and a third receiver 633 ;

[0084] The signal processing circuit is connected to the first receiver 631 , the second receiver 632 and the third receiver 633 . The first receiver 631 , the second receiver 632 and the third receiver 633 are used to convert the received sound wave signals of different frequencies into electrical signals and transmit them to the signal processing circuit.

[0085] Specifically, the number of receivers in the frequency receiver 63 can be increased as needed. Figure 3 The frequency receiver 63 is shown as an example only and includes three receivers: a first receiver 631, a second receiver 632, and a third receiver 633. The first receiver 631, the second receiver 632, and the third receiver 633 respectively receive sound wave signals of different frequencies, convert the sound wave signals into electrical signals, and transmit them to the signal processing circuit.

[0086] Optionally, the probe of the self-contained acoustic receiver is replaced according to the receiving frequency, which is less than or equal to 10 Hz.

[0087] Specifically, the probe of the self-contained acoustic receiver can be replaced according to the receiving frequency, down to 10Hz. The self-contained design requires no signal cables for operation, making it easy to operate. The modular design allows for the probe to be changed as needed, providing greater engineering flexibility and wide application in defense, scientific research, and other fields.

[0088] An embodiment of the present invention further provides an in-situ low-frequency acoustic measurement method for seabed sediments, which is applied to the in-situ low-frequency acoustic measurement system for seabed sediments in any embodiment of the present invention. Figure 5 This is a flow chart of a method for in-situ low-frequency acoustic measurement of seabed sediments according to an embodiment of the present invention. Figure 5 , in-situ low-frequency acoustic measurement methods for seafloor sediments include:

[0089] S110. When the low-frequency sound source transmitting host controls the drill pipe to drill into the target detection formation, a self-contained acoustic receiver is inserted into the drill pipe. After the drill pipe clamps the self-contained acoustic receiver, the self-contained acoustic receiver is pressed into the target detection formation.

[0090] Specific, combined Figure 1 , the drilling mechanism in the low-frequency sound source transmitting host 40 drives the drill rod 50 to start drilling towards the target detection formation, transfers and connects multiple drill rods 50, and repeats the drilling. Such reciprocating drilling operation enables the drill rod 50 to drill at a great depth. When the drill rod 50 drills into the target detection formation, the self-contained acoustic receiver 60 is inserted into the drill rod 50. After the drill rod 50 clamps the self-contained acoustic receiver 60, the seabed hydraulic drilling system 41 presses the self-contained acoustic receiver 60 into the target detection formation. The low-frequency sound source transmitting host 40 is not restricted by complex formations, and can assist in delivering the self-contained acoustic receiver 60 to a greater depth, thereby increasing the transmitting and receiving distance of the acoustic measurement, and reducing the acoustic measurement limit frequency to 10Hz.

[0091] S120. The low-frequency sound source transmitting host is leveled on the seabed and close to the seabed sediment. The low-frequency sound source transmitting host transmits sound wave signals of different frequencies. The self-contained acoustic receiver processes the received sound waves of different frequencies into data and stores them.

[0092] Specific, combined Figure 1 After stabilizing, the low-frequency sound source transmitter 40 is hydraulically driven to contact the seabed and emit sound waves of varying frequencies. These waves penetrate the seabed sediment and reach the self-contained acoustic receiver 60, where they are converted into electrical signals. The electrical signals are then converted into data and stored. The self-contained receiver 60 can be connected to a different connector depending on the receiving frequency, with frequencies as low as 10 Hz.

[0093] S130. After completing the acoustic measurement, the self-contained acoustic receiver, drill pipe, and low-frequency sound source transmitter are recovered to the deck of the mother ship. The control center reads the data measured by the self-contained acoustic receiver and analyzes the data to obtain the sound velocity and sound attenuation of the seabed sediment at different frequencies.

[0094] Specific, combined Figure 1After the acoustic measurement is completed, the self-contained acoustic receiver 60, drill pipe 50, and low-frequency sound source transmitter 40 are retrieved and returned to the deck of the mother ship 10. The self-contained acoustic receiver 60 is connected to the control center 20 via the umbilical cable 30 to read the measurement data. Through data analysis, the sound velocity and sound attenuation of the seabed sediment at different frequencies can be obtained. This overcomes the shortcoming of existing equipment that cannot measure the low-frequency acoustic characteristics of seabed sediments and directly measures the low-frequency acoustic characteristics of seabed sediments.

[0095] The in-situ low-frequency acoustic measurement method for seabed sediments provided in an embodiment of the present invention is used to control the in-situ low-frequency acoustic measurement system for seabed sediments provided in any embodiment of the present invention. Therefore, the in-situ low-frequency acoustic measurement method for seabed sediments provided in an embodiment of the present invention also has the beneficial effects described in the above embodiments, which will not be repeated here.

[0096] Figure 6 A schematic diagram of the structure of an electronic device 1 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0097] like Figure 6 As shown, electronic device 1 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., which is communicatively connected to at least one processor 11. The memory stores a computer program that can be executed by the at least one processor, and processor 11 can perform various appropriate actions and processes according to the computer program stored in read-only memory (ROM) 12 or the computer program loaded from storage unit 18 into random access memory (RAM) 13. Various programs and data required for the operation of electronic device 1 can also be stored in RAM 13. Processor 11, ROM 12, and RAM 13 are connected to each other via bus 14. Input / output (I / O) interface 15 is also connected to bus 14.

[0098] Multiple components in electronic device 1 are connected to I / O interface 15, including an input unit 16, such as a keyboard, mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, optical disk, etc.; and a communication unit 19, such as a network card, modem, wireless communication transceiver, etc. Communication unit 19 allows electronic device 1 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0099] The processor 11 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the in-situ low-frequency acoustic measurement method for seafloor sediments.

[0100] In some embodiments, the in-situ low-frequency acoustic measurement method for seabed sediments can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 1 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the in-situ low-frequency acoustic measurement method for seabed sediments described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to perform the in-situ low-frequency acoustic measurement method for seabed sediments by any other appropriate means (e.g., by means of firmware).

[0101] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0102] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0103] In the context of the present invention, computer-readable storage media can be tangible media that can contain or store a computer program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage media can include but are not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0104] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0105] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0106] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0107] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0108] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. An in-situ low-frequency acoustic measurement system for seabed sediments, characterized in that: include: Mother ship, control center, umbilical cable, low-frequency sound source transmitter, drill pipe, self-contained acoustic receiver; The control center is arranged on the mother ship and connected to the umbilical cable, and the control center is used to control the low-frequency sound source transmitting host and the self-contained acoustic receiver; The umbilical cable is connected to the low-frequency sound source transmitting host, and the control center communicates and supplies power to the low-frequency sound source transmitting host through the umbilical cable; The low-frequency sound source transmitting host is connected to the self-contained acoustic receiver via the drill rod. When the low-frequency sound source transmitting host controls the drill rod to drill into the target detection formation, the self-contained acoustic receiver is inserted into the drill rod. After the drill rod clamps the self-contained acoustic receiver, the self-contained acoustic receiver is pressed into the target detection formation. The drill rod is used to drill into seabed sediments. The low-frequency sound source transmitting host is leveled on the seabed and closely attached to the seabed sediment, and is used to transmit sound wave signals of different frequencies. The self-contained acoustic receiver processes the received sound wave signals of different frequencies into data and stores the data. The control center reads the data measured by the self-contained acoustic receiver, and obtains the sound velocity and sound attenuation of the seabed sediment at different frequencies after analyzing the data.

2. The system according to claim 1, wherein: The low-frequency sound source transmitting host includes: a submarine hydraulic drilling system, a sound source bracket and a low-frequency sound source; The sound source bracket is mounted on a frame of the submarine hydraulic drilling system located above the seabed surface. The submarine hydraulic drilling system is used to control the drill pipe to drill into the target detection formation, insert the self-contained acoustic receiver into the drill pipe, and after the drill pipe clamps the self-contained acoustic receiver, press the self-contained acoustic receiver into the target detection formation. The low-frequency sound source is installed on the sound source bracket, the low-frequency sound source is close to the seabed sediment, and the low-frequency sound source is used to emit sound wave signals of different frequencies.

3. The system according to claim 1, wherein: The subsea hydraulic drilling system includes: a feeding mechanism, a rotating mechanism, a clamping mechanism, a storage unit, a transfer unit, and a receiver recovery device; The storage unit is used to store the drill rod, and the feeding mechanism is used to lift the rotating mechanism; The transfer unit is used to grab the drill rod from the storage unit and transfer it to the center position of the rotating mechanism; The rotating mechanism is connected to the drill rod transported by the transfer unit, the rotating mechanism drives the drill rod to rotate, the feeding mechanism feeds downward stably, and the drill rod drills into the formation; When the feeding mechanism reaches the end of its stroke, the clamping mechanism clamps the drill rod, the rotating mechanism is disconnected from the drill rod, and the feeding mechanism lifts the rotating mechanism to the highest position, transfers and connects the remaining drill rods, and repeats the drilling process; The receiver recovery device is used to recover the self-contained acoustic receiver after completing the acoustic measurement.

4. The system according to claim 1, wherein: The self-contained acoustic receiver includes: a salvage recovery component, a measurement and control cabin, and a frequency receiver; The salvage and recovery component is connected to the measurement and control cabin, and the measurement and control cabin is connected to the frequency receiver. The frequency receiver is used to convert the received sound wave signals of different frequencies into electrical signals and transmit them to the measurement and control cabin. The measurement and control cabin is used to convert the electrical signals into data and store them. The salvage and recovery component is used to recover the self-contained acoustic receiver after completing the acoustic measurement.

5. The system according to claim 4, characterized in that The measurement and control cabin includes: a DC power signal processing circuit and a data storage circuit; The DC power supply is connected to the signal processing circuit and the data storage circuit, and the DC power supply is used to provide power to the signal processing circuit and the data storage circuit; The signal processing circuit is connected to the data storage circuit. The signal processing circuit is used to convert the electrical signal into data and transmit the data to the data storage circuit. The data storage circuit is used to store the data.

6. The system according to claim 5, characterized in that The frequency receiver comprises at least: a first receiver, a second receiver and a third receiver; The signal processing circuit is connected to the first receiver, the second receiver and the third receiver. The first receiver, the second receiver and the third receiver are used to convert received sound wave signals of different frequencies into electrical signals and transmit them to the signal processing circuit.

7. The system according to claim 1, wherein: The probe of the self-contained acoustic receiver is replaced according to the receiving frequency, which is less than or equal to 10 Hz.

8. A method for in-situ low-frequency acoustic measurement of seabed sediments, characterized in that: The in-situ low-frequency acoustic measurement system for seabed sediments according to any one of claims 1 to 7, wherein the measurement method comprises: When the low-frequency sound source transmitting host controls the drill rod to drill into the target detection formation, the self-contained acoustic receiver is inserted into the drill rod, and after the drill rod clamps the self-contained acoustic receiver, the self-contained acoustic receiver is pressed into the target detection formation; The low-frequency sound source transmitting host is leveled on the seabed and closely attached to the seabed sediment, and the low-frequency sound source transmitting host transmits sound wave signals of different frequencies, and the self-contained acoustic receiver processes the received sound waves of different frequencies into data and stores the data; After completing the acoustic measurement, the self-contained acoustic receiver, the drill pipe, and the low-frequency sound source transmitter are recovered to the deck of the mother ship. The control center reads the data measured by the self-contained acoustic receiver and obtains the sound velocity and sound attenuation of the seabed sediment at different frequencies after analyzing the data.

9. An electronic device, characterized in that: include: one or more processors; a memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to claim 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to claim 8 is implemented.

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