CN111579645A - Nondestructive testing device and method for underwater near-source wave field - Google Patents
Nondestructive testing device and method for underwater near-source wave field Download PDFInfo
- Publication number
- CN111579645A CN111579645A CN202010563511.XA CN202010563511A CN111579645A CN 111579645 A CN111579645 A CN 111579645A CN 202010563511 A CN202010563511 A CN 202010563511A CN 111579645 A CN111579645 A CN 111579645A
- Authority
- CN
- China
- Prior art keywords
- underwater
- module
- acoustic transducer
- wave field
- impact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/09—Analysing solids by measuring mechanical or acoustic impedance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0232—Glass, ceramics, concrete or stone
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/106—Number of transducers one or more transducer arrays
Abstract
The invention provides an underwater near-source wave field nondestructive testing device and method, wherein the method comprises the following steps: the anvil is used for bearing the impact of the impact module; the dowel bar is used for transmitting the impact force received by the anvil to the hammering head; the hammering head is connected with the dowel bar and is in close contact with the surface of the underwater structure to be detected, and is used for applying the received impact force to the surface of the underwater structure to be detected; the underwater acoustic transducer is used for receiving the response of the underwater structure to be detected to the impact force of the hammering head; the recording module is used for recording the response signal received by the underwater acoustic transducer and the impact strength of the striking module; the steering wheel is used for rotating the dowel bar and driving and adjusting the arrangement direction of the underwater acoustic transducers; the balancing weight is used for ensuring the stability of the system in water; the data analysis module is used for analyzing the acquired and recorded near-source wave field detection data and the seismic source excitation force and extracting wave impedance and position information reflecting the internal defects of the structure from the acquired and recorded near-source wave field detection data and the seismic source excitation force.
Description
Technical Field
The invention relates to the technical field of underwater engineering detection, in particular to an underwater near-source wave field nondestructive detection device and method.
Background
China is a water conservancy project country, and not only has famous projects such as the three gorges dam and the like, but also has thousands of medium and small reservoirs, water gates, water delivery pipes, tunnels and the like, and also has various ports, large-scale infrastructures such as cross-river bridges, cross-sea bridges and the like. As the operation period increases, various diseases inevitably occur in the facilities, and engineering detection is just like the physical examination of patients by doctors, and basic data can be provided for the maintenance of the engineering by detecting the engineering. Because all or part of the facilities are built under water or operated under water, the underwater nondestructive testing is an indispensable technical means for guaranteeing the healthy operation of the projects.
At present, the detection of underwater structures is mainly carried out by means of underwater touch of divers, underwater robot photographing or sonar scanning and the like. Wherein, the underwater probing of the diver is to know the surface condition of the structure through the observation and touch of the diver, so that the danger is high and the efficiency is low; the underwater robot is limited by load, and can only carry photographing equipment for underwater photographing at present; sonar scanning is to emit a beam of sound waves into water through a transducer and then receive reflected waves from the surface of a structure to grasp the position and shape of the structure. Therefore, the existing detection means can only provide the apparent characteristics of the structure, cannot provide the internal disease condition of the structure, and can only drill and core the structure through complex underwater operation to know the internal condition of the structure, so that the cost is high, the efficiency is low, and the structure can be damaged. Therefore, there is a need for an underwater nondestructive inspection method and apparatus that can detect the internal conditions of a structure.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an underwater near-source wave field nondestructive testing device and method.
The invention is realized by the following technical scheme.
According to one aspect of the invention, an underwater near-source wave field nondestructive testing device is provided, which comprises: the device comprises a recording module, a striking module, an anvil, a steering wheel, a dowel bar, a balancing weight, a hammering head, an underwater acoustic transducer and a data analysis module; wherein:
the anvil is used for bearing the impact of the impact module;
the dowel bar is used for transmitting the striking force applied to the anvil to the hammering head;
the hammering head is connected with the dowel bar and is in close contact with the surface of the underwater structure to be detected, and is used for applying the received impact force to the surface of the underwater structure to be detected;
the underwater acoustic transducer is used for receiving the response of the underwater structure to be detected to the impact force of the hammering head;
the recording module is used for recording the response signal received by the underwater acoustic transducer and the impact degree of the striking module;
the steering wheel is used for rotating the dowel bar and driving the arrangement direction of the underwater acoustic transducers to be adjusted;
the balancing weight is used for ensuring the stability of the system in water;
the data analysis module is used for analyzing the collected and recorded response data and the striking force and extracting the wave impedance and the position information of the internal defect of the reflecting structure.
Preferably, the dowel bar comprises one or more connecting rods, wherein each connecting rod is of a hollow tube structure except for the connecting port portion.
Preferably, the steering wheel is fixed on a dowel bar below the anvil, the dowel bar is perpendicular to a plane formed by the steering wheel, and a horizontal display and a direction indicator are arranged on the steering wheel and used for adjusting the angle and the direction of the dowel bar.
Preferably, the part of the hammering head, which is in contact with the surface of the underwater structure to be detected, is a smooth spherical surface.
Preferably, the striking module adopts an impact hammer with a force sensor, and the force sensor is used for sensing the striking power.
Preferably, the recording module comprises a multi-channel analog-to-digital converter and a recording terminal, and the multi-channel analog-to-digital converter is at least used for collecting the output signal of the underwater acoustic transducer and the output signal of the striking module and recording the output signal in the recording terminal.
Preferably, the underwater acoustic transducer comprises a plurality of sensors, the plurality of sensors being arranged in an annular array at equal intervals.
Preferably, the sensors are arranged in a polyurethane hose at equal intervals, the polyurethane hose is connected end to form a sealed annular structure, the sealed annular structure is filled with insulating materials, and the sealed joint is connected with the data recording module through a lead-out signal wire.
Preferably, the number of the sensors is 8, and connecting lines formed between the center positions of the 8 sensors and the center of the ring structure point to the directions of 0 °, 45 °, 90 °, 135 °, 180 °, 225 °, 270 °, and 315 °, respectively.
Preferably, the underwater acoustic transducer is fixed on the dowel bar through a vibration isolation material, and 0 degrees of the underwater acoustic transducer are consistent with 0 degrees of the dowel bar, and the dowel bar is perpendicular to the plane of the underwater acoustic transducer.
Preferably, the radius of the underwater acoustic transducer is less than or equal to the depth from the underwater acoustic transducer to the defect.
Preferably, the connection interfaces of the anvil, the dowel and the hammering head all have directionality and all include a male interface and a female interface, wherein the male interface has a cylindrical protrusion near the edge to represent the north orientation, a circular recess representing the north orientation is provided at the corresponding position of the female interface, and the cylindrical protrusion of the male interface is inserted into the circular recess of the female interface during connection and two adjacent components are connected and fixed by a nut to ensure that the whole device is connected firmly from bottom to top and the north orientation is unchanged.
According to another aspect of the invention, an underwater near-source wave field nondestructive testing method is provided, which comprises the following steps:
the method comprises the following steps of (1) setting a hammering head of the underwater near-source wave field nondestructive testing device below and a anvil above, sinking the hammering head and an underwater acoustic transducer to the surface of an underwater structure to be tested together, and enabling the hammering head to be in close contact with the surface of the structure to be tested;
the length of the force transmission rod is properly adjusted according to the water depth, so that the anvil and the steering wheel are positioned at a proper height above the water surface, the arrangement direction of the underwater acoustic transducers is adjusted by rotating the steering wheel, and the force transmission rod is perpendicular to the surface of the structure to be detected;
adopt and hit the module and hit the hammering block, the impact force is applied to waiting to examine the structure surface via dowel steel and hammering head, hits when the module hits the hammering block, outputs a trigger signal, starts recording module record impact strength and by the response data of waiting to examine the structure to impact force that underwater acoustic transducer transmitted, utilize the impact strength and wait to examine the response data of structure to impact force and accomplish the near source wave field nondestructive test to waiting to examine the structure under water.
Preferably, the method for performing near-source wave field nondestructive testing on the surface of the underwater structure to be tested by using the impact strength and the response data of the structure to be tested to the impact strength comprises the following steps:
normalizing the response data of the structure to the impact force by utilizing the impact force;
acquiring seismic source sub-waves from data recorded by a recording module by using a statistical method;
performing secondary wave deconvolution on the recorded data by using the acquired seismic source secondary wave to acquire a reflection coefficient of an internal defect part of the structure to be detected;
and quantitatively evaluating the severity of the defect through the reflection coefficient, determining the depth of the defect through the arrival time of the reflected wave, and completing the near-source wave field nondestructive testing of the underwater structure to be tested.
Due to the adoption of the technical scheme, the invention has at least one of the following beneficial effects:
the nondestructive detection device and the nondestructive detection method for the underwater near-source wave field realize the nondestructive detection of the internal defects of the underwater structure through a simple device, so that the hydraulic structure which can be detected only after water supply and drainage are stopped and the hydraulic structure which is difficult to detect because water cannot be drained can be detected with water in a running state.
The nondestructive testing device and method for the underwater near-source wave field have the advantages of simple, portable and flexible equipment structure, easiness in operation, capability of utilizing small-sized underwater platforms such as rubber boats and sampans to work and capability of greatly reducing the testing cost.
The nondestructive detection device and method for the underwater near-source wave field have the advantages that the detection method is nondestructive and environment-friendly, no damage is caused to structures, no pollution is caused to water quality, and no influence is caused to the environment; the method is particularly suitable for detecting drinking water conveying structures with high environmental protection requirements and the like.
The nondestructive detection device and method for the underwater near-source wave field are applicable to water depth limited by the length of the dowel bar in a water purification state, and can reach 20m generally; the dowel bar is a thin metal bar, so that the strength is high, the resistance is low, and the lower part of the dowel bar is provided with a balance weight, so that the applicable water depth can reach 5m even in a flowing water state.
The nondestructive testing device and method for the underwater near-source wave field are clear in principle and simple to operate, and can be used by general workers with little training and operated by 1-2 persons.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of the overall structure of an underwater near-source wave field nondestructive testing device in a preferred embodiment of the invention.
Fig. 2 is a schematic view of a dowel bar structure in a preferred embodiment of the present invention.
Fig. 3 is a schematic diagram of a connection interface structure according to a preferred embodiment of the present invention.
FIG. 4 is a schematic illustration of a dowel connection in a preferred embodiment of the present invention.
Fig. 5 is a schematic view of the mounting structure of the hammering head and the counterweight in a preferred embodiment of the present invention.
Fig. 6 is a schematic view of an anvil and steering wheel mounting arrangement in a preferred embodiment of the present invention.
Fig. 7 is a schematic diagram of the structure of an annular array of underwater acoustic transducers in a preferred embodiment of the present invention.
In the figure, 1001 is a female connector, 1002 is a male connector, 1003 is a circular groove, 1004 is a cylindrical protrusion, 2001 is an interface part, 3001 is a transmission rod butt joint part, 3002 is a connecting nut, 3003 is a connecting part between connecting rods, 6001 is an annular structure, 6002 is an insulating medium, 6003 is a sensor, 6004 is a vibration isolation material, 7001 is an anvil, 7002 is a steering wheel, 7003 is a transmission rod, 7004 is a balancing weight, 7005 is a hammering head, 7006 is an underwater acoustic transducer, 7007 is a striking module, and 7008 is a recording module.
Detailed Description
The following examples illustrate the invention in detail: the embodiment is implemented on the premise of the technical scheme of the invention, and a detailed implementation mode and a specific operation process are given. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Fig. 1 is a schematic diagram showing the overall structure of the underwater near-source wave field nondestructive testing device in a preferred embodiment of the invention. This embodiment provides an underwater near-source wave field nondestructive test device, includes: the system comprises a recording module 7008, a striking module 7007, an anvil 7001, a steering wheel 7002, a force transmission rod 7003, a balancing weight 7004, a hammering head 7005, an underwater acoustic transducer 7006 and a data analysis module (not shown). Wherein: the anvil 7001 is located near the impact module 7007 for receiving the impact of the impact module 7007; a force transmission rod 7003 is positioned below the anvil 7001 and used for transmitting the impact force of the impact module 7007 received by the anvil 7001 to the hammering head 7005; the hammering head 7005 is connected with the force transmission rod 7003 and is in close contact with the surface of the underwater structure to be detected, and is used for applying the impact force transmitted by the force transmission rod 7003 to the surface of the structure to be detected; the underwater acoustic transducer 7006 is fixed on the dowel bar 7003 and used for receiving the response of the structure to the impact force of the hammering head 7005; the steering wheel 7002 is connected with the force transmission rod 7003 and is used for rotating the force transmission rod 7003 and driving and adjusting the arrangement direction and the angle of the underwater acoustic transducers 7006; a weight 7004 is attached to the hammer head 7005 for increasing the weight of the device to increase the stability of the device in water. The recording module 7008 is connected with the underwater acoustic transducer 7006 and the striking module 7007 and is used for recording the striking strength transmitted by the striking module 7007 and the response signal transmitted by the underwater acoustic transducer 7006. The data analysis module is used for analyzing response data which are respectively transmitted by the underwater acoustic transducer module 7006 and recorded by the recording module 7008 and striking force data which are transmitted by the striking module 7007 and recorded by the recording module, and extracting wave impedance and reflection interface depth information which reflect the internal defects of the structure from the data.
As a preferred embodiment, as shown in fig. 2, the connecting interfaces of the anvil 7001, the force transmission rod 7003 and the hammering head 7005 are all directional, and include a male interface 1002 and a female interface 1001, the male interface 1002 has a cylindrical protrusion 1004 near the edge, which represents the north-pointing direction, and a circular recess, which represents the north-pointing direction, is located at the corresponding position of the female interface 1001, and when connecting, the cylindrical protrusion 1004 of the male interface 1002 is partially inserted into the circular recess of the female interface 1001 and connects and fixes two adjacent components by means of a nut, so as to ensure that the whole device is connected firmly from bottom to top and the north-pointing direction is not changed.
As a preferred embodiment, as shown in fig. 3 and 4, the force transfer lever 7003 may be formed by connecting one or more connecting rods, and the remaining portion of the connecting rod is a hollow tube in addition to the interface portion 2001 of the connecting rod to ensure greater rigidity and less weight of the connecting rod.
As a preferred embodiment, as shown in fig. 5, the contact part of the hammering head 7005 with the surface of the object to be tested is a smooth spherical surface to ensure good contact with the surface of the structure, and the surface of the structure is not damaged when being excited.
As a preferred embodiment, as shown in fig. 6, a steering wheel 7002 is fixed to a force transmission lever 7003 below an anvil 7001, the force transmission lever 7003 is perpendicular to a plane formed by the steering wheel 7002, and a horizontal display and a direction indicator are provided on the steering wheel 7002 so as to adjust the angle and direction of the force transmission lever 7003.
As a preferred embodiment, as shown in fig. 7, the array of underwater acoustic transducers 7006 is an annular array, 8 sensors 6003 are arranged at equal intervals in a polyurethane hose, the polyurethane hose is connected end to form a sealed annular structure 6001, the inside is filled with an insulating medium 6002, and signal lines are led out of the annular tube through a sealed joint and finally connected to the data recording module.
As a preferred embodiment, the connection lines formed by the centers of the 8 sensors of the underwater acoustic transducer and the center of the ring array point in the 0 ° (north), 45 ° (north east), 90 ° (east), 135 ° (south-east), 180 ° (south), 225 ° (south-west), 270 ° (west-west) and 315 ° (north-west) directions, respectively.
As a preferred embodiment, the underwater acoustic transducer 7006 is fixed to the force transfer rod 7003 through a vibration isolation material 6004, and the 0 ° (due north) direction of the transducer array coincides with the 0 ° (due north) direction of the force transfer rod, and the force transfer rod 7003 is perpendicular to the plane of the underwater acoustic transducer 7006.
As a preferred embodiment, the radius of the underwater acoustic transducer 7006 is ≦ the depth of the transducer to the defect, placing the underwater acoustic transducer within the near source field to ensure that the recorded data can be viewed approximately as zero offset data.
As a preferred embodiment, the impact module 7007 is generally a percussion hammer with a force sensor for sensing the magnitude of the impact force.
As a preferred embodiment, the recording module 7008 includes a multi-channel analog-to-digital converter and a recording terminal, wherein the multi-channel analog-to-digital converter is capable of collecting at least an output signal of each transducer in the array of the underwater acoustic transducers 7006 and an output signal of the force sensor of the impact module 7007 and recording in the recording terminal.
In the above embodiments, the data analysis module may be implemented by a device having a data analysis function, such as a computer.
In another embodiment of the present invention, a nondestructive testing method for an underwater near-source wave field is provided, where the method uses the apparatus of the above embodiment to perform nondestructive testing for an underwater near-source wave field, and includes the specific steps of:
(1) connecting an anvil 7001, a steering wheel 7002, a force transmission rod 7003, a balancing weight 7004 and a hammering head 7005 into a whole, wherein the hammering head 7005 faces downwards, the anvil 7001 faces upwards, and the hammering head 7005 and a sensor 6003 array sink to the surface of a structure to be detected together from a ship or other water surface platforms so that the hammering head 7005 is in close contact with the surface of the structure to be detected;
(2) the length of the force transmission rod 7003 is properly adjusted according to the water depth, so that the anvil 7001 and the steering wheel 7002 are positioned at a proper height above the water surface, the steering wheel 7002 is rotated to adjust the arrangement direction of the underwater transducers 7006, and the force transmission rod 7003 is perpendicular to the surface of the structure to be detected;
(3) the impact module 7007 is used for impacting the anvil, impact force is applied to the surface of the structure through the force transmission rod 7003 and the hammering head 7005, the impact module 7007 outputs a trigger signal when impacting the anvil 7001, the recording module 7008 is started to record impact force and response data of the structure to the impact force transmitted by the underwater sound transducer 7006, and nondestructive detection of the near-source wave field of the underwater structure to be detected is completed by utilizing the impact force and the response data of the structure to the impact force.
(4) When the data analysis module carries out data processing on the impact force and the response data of the structure to be detected to the impact force, the internal interface reflection coefficient of the structure is obtained through impact force normalization and seismic source secondary wave deconvolution on the basis of the near-source wave field vertical reflection theory, the wave impedance of a medium in a defect area is further calculated, and the internal defect of the structure is quantitatively analyzed through the wave impedance.
Further, the above-mentioned response data that utilizes the impact force and wait to examine the structure to the impact force accomplishes and waits to examine the near source wave field nondestructive test of structure under water, can adopt following technique to realize, include:
s1, normalizing the response data by using the striking force of each excitation acquired by the force sensor;
s2, acquiring seismic source wavelet from many recorded data by using a statistical method;
s3, performing secondary wave deconvolution on the recorded data by using the acquired seismic source secondary wave to acquire a reflection coefficient of the defect part in the structure;
since the reflection coefficient is determined by the difference between the wave impedance (product of the elastic wave velocity and the density) of the medium at the defect site and the wave impedance of the medium without the defect, the severity of the defect can be quantitatively evaluated by the reflection coefficient, and the depth of the defect can be determined by the arrival time of the reflected wave.
Due to the difference of operating conditions and operators, the force for striking the anvil by the exciting module each time can be different, the difference of the exciting force directly influences the strength of signals, and the striking force acquired by the force sensor each time is utilized to normalize the response data, so that the change of the strength of the response signals caused by the change of the exciting force can be eliminated.
Let the response function and detection record of the defect-free structure be r1(t) and y1(t) the response function and the detection record of the defective structure are r2(t) and y2(t) response function of defect is r3(t), the seismic source secondary wave is w (t), and the following are included:
y1(t)＝w(t)*r1(t)；y2(t)＝w(t)*r2(t)＝y1(t)*r3(t); "+" represents convolution operation.
From the above formula, it can be seen that by knowing where the structure is defect-free and performing deconvolution operation on all the detection records using the detection records at that location, the response function r of the defect can be obtained3(t)。
Since it is impossible to determine where the defect is not present in advance, it is necessary to obtain a detection record of the defect-free position by a statistical method. Assuming that most of the area of the structure is defect-free, the average of all the inspection records (average inspection record) is obtained, the average inspection record is approximately used as the inspection data of the defect-free area, and then the response function r of the defect can be obtained by deconvolution operation3(t)。
Since the transducer is in the near-source wave field, the detection data can be approximately regarded as zero offset data, and the elastic wave is perpendicularly incident on the defect, so the reflection coefficient can be expressed as:
r3＝(ρ2v2-ρ1v1)/(ρ2v2+ρ1v1)
ρ1v1is the product of the density and elastic wave velocity of the structural material, and is the wave impedance, ρ, of the structural material2v2Density and elastic wave velocity of defect partThe product of (d) is the wave impedance of the defect site. Since the density and the elastic wave velocity of the structural material are known quantities, the wave impedance value of the defect part can be quantitatively obtained according to the formula, and the severity of the defect can be quantitatively evaluated.
The nondestructive detection system and the nondestructive detection method for the underwater near-source wave field provided by the embodiment of the invention realize the nondestructive detection of the internal defects of the underwater structure through a simple device, so that the hydraulic structure which can be detected only after water supply and drainage are stopped and the hydraulic structure which is difficult to detect because water cannot be drained can be detected with water in a running state; the equipment is simple, portable, flexible and easy to operate, and can utilize small water platforms such as rubber boats and sampans to work, so that the detection cost is greatly reduced; the detection method is nondestructive and environment-friendly, does not cause any damage to structures, does not cause any pollution to water quality, and does not affect the environment; the method is particularly suitable for detecting drinking water conveying structures with high environmental protection requirements and the like; the applicable water depth under the water purification state is only limited by the length of the dowel bar and can reach 20m generally; the dowel bar is a thin metal bar, so that the strength is high, the resistance is low, and the lower part of the dowel bar is also provided with a balance weight, so that the applicable water depth can reach 5m even in a dynamic water state.
The nondestructive detection system and method for the underwater near-source wave field provided by the embodiment of the invention have the advantages of clear principle and simplicity in operation, and can be used by general workers with little training and operated by 1-2 persons.
It should be noted that, the steps in the method provided by the present invention can be implemented by using corresponding modules, devices, units, and the like in the system, and those skilled in the art can implement the step flow of the method with reference to the technical solution of the system, that is, the embodiment in the system can be understood as a preferred example of the implementation method, and details are not described herein.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (10)
1. An underwater near-source wave field nondestructive testing device is characterized by comprising: the device comprises a recording module, a striking module, an anvil, a steering wheel, a dowel bar, a balancing weight, a hammering head, an underwater acoustic transducer and a data analysis module; wherein:
the anvil is used for bearing the impact of the impact module;
the dowel bar is used for transmitting the striking force applied to the anvil to the hammering head;
the hammering head is connected with the dowel bar and is in close contact with the surface of the underwater structure to be detected, and is used for applying the received impact force to the surface of the underwater structure to be detected;
the underwater acoustic transducer is used for receiving the response of the underwater structure to be detected to the impact force of the hammering head;
the recording module is used for recording the response signal received by the underwater acoustic transducer and the impact strength of the striking module;
the steering wheel is used for rotating the dowel bar and driving the arrangement direction of the underwater acoustic transducers to be adjusted;
the balancing weight is used for ensuring the stability of the system in water;
the data analysis module is used for analyzing the collected and recorded response data and the striking force and extracting wave impedance and position information reflecting the internal defects of the structure.
2. The apparatus of claim 1, wherein the dowel bar comprises one or more connecting rods, and each connecting rod except the connecting part has a hollow tube structure.
3. The underwater near-source wave field nondestructive testing device of claim 1, wherein the steering wheel is fixed on a dowel bar below the anvil, the dowel bar is perpendicular to a plane formed by the steering wheel, and a horizontal display and a direction indicator are arranged on the steering wheel and used for adjusting the angle and the direction of the dowel bar.
4. The nondestructive testing device for the underwater near-source wave field according to claim 1, wherein a part of the hammering head, which is in contact with the surface of the underwater structure to be tested, is a smooth spherical surface.
5. The underwater near-source wave field nondestructive testing device of claim 1, wherein the striking module employs an impact hammer with a force sensor, and the force sensor is used for sensing the striking force.
6. The device of claim 1, wherein the recording module comprises a multi-channel analog-to-digital converter and a recording terminal, and the multi-channel analog-to-digital converter is at least used for collecting the output signal of the underwater acoustic transducer and the output signal of the impact module and recording the output signal in the recording terminal.
7. The nondestructive testing device for the underwater near-source wave field according to any one of claims 1 to 6, wherein the connection interfaces of the anvil, the dowel bar and the hammering head are all directional and include a male interface and a female interface, wherein the male interface has a cylindrical protrusion near the edge and represents a north-pointing direction, a circular recess representing the north-pointing direction is provided at a corresponding position of the female interface, and the cylindrical protrusion of the male interface is inserted into the circular recess of the female interface during connection and two adjacent components are connected and fixed by a nut to ensure that the whole device is connected firmly from bottom to top and the north-pointing direction is unchanged; and/or
The underwater acoustic transducer comprises a plurality of sensors which are arranged in an annular array at equal intervals.
8. The apparatus of claim 7, wherein the underwater acoustic transducer further comprises any one or more of the following:
the sensors are arranged in a polyurethane hose at equal intervals, the polyurethane hose is connected end to form a sealed annular structure, the sealed annular structure is filled with insulating materials, and the sealed joint is connected with the data recording module through a lead-out signal wire;
-the number of the plurality of sensors is 8, and the connecting lines formed between the center positions of the 8 sensors and the center of the ring structure point in the directions of 0 °, 45 °, 90 °, 135 °, 180 °, 225 °, 270 ° and 315 °, respectively;
the underwater acoustic transducer is fixed on the dowel bar through a vibration isolation material, and 0 degrees of the underwater acoustic transducer are consistent with 0 degrees of the dowel bar, and the dowel bar is perpendicular to the plane of the underwater acoustic transducer;
-the radius of the underwater acoustic transducer is ≦ the depth of the underwater acoustic transducer to the defect.
9. An underwater near-source wave field nondestructive testing method is characterized by comprising the following steps:
the method comprises the following steps of (1) setting a hammering head of the underwater near-source wave field nondestructive testing device below and a anvil above, sinking the hammering head and an underwater acoustic transducer to the surface of an underwater structure to be tested together, and enabling the hammering head to be in close contact with the surface of the structure to be tested;
the length of the force transmission rod is properly adjusted according to the water depth, so that the anvil and the steering wheel are positioned at a proper height above the water surface, the arrangement direction of the underwater acoustic transducers is adjusted by rotating the steering wheel, and the force transmission rod is perpendicular to the surface of the structure to be detected;
adopt and hit the module and hit the hammering block, the impact force is applied to waiting to examine the structure surface via dowel steel and hammering head, hits when the module hits the hammering block, outputs a trigger signal, starts recording module record impact strength and by the response data of waiting to examine the structure to impact force that underwater acoustic transducer transmitted, utilize the impact strength and wait to examine the response data of structure to impact force and accomplish the near source wave field nondestructive test to waiting to examine the structure surface under water.
10. The method for nondestructive testing of underwater near-source wave field according to claim 9, wherein the method for nondestructive testing of the near-source wave field of the underwater structure to be tested is performed by using the impact force and the response data of the structure to be tested to the impact force, and comprises the following steps:
normalizing the response data of the structure to the impact force by utilizing the impact force;
acquiring seismic source sub-waves from data recorded by a recording module by using a statistical method;
performing secondary wave deconvolution on the recorded data by using the acquired seismic source secondary wave to acquire a reflection coefficient of an internal defect part of the structure to be detected;
and quantitatively evaluating the severity of the defect through the reflection coefficient, and determining the depth of the defect through the arrival time of the reflected wave to finish the nondestructive detection of the near-source wave field of the underwater structure to be detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010563511.XA CN111579645A (en) | 2020-06-19 | 2020-06-19 | Nondestructive testing device and method for underwater near-source wave field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010563511.XA CN111579645A (en) | 2020-06-19 | 2020-06-19 | Nondestructive testing device and method for underwater near-source wave field |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111579645A true CN111579645A (en) | 2020-08-25 |
Family
ID=72125837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010563511.XA Pending CN111579645A (en) | 2020-06-19 | 2020-06-19 | Nondestructive testing device and method for underwater near-source wave field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111579645A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557500A (en) * | 2020-11-05 | 2021-03-26 | 中国水利水电科学研究院 | Underwater elastic wave full wave field nondestructive detection system and method |
-
2020
- 2020-06-19 CN CN202010563511.XA patent/CN111579645A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557500A (en) * | 2020-11-05 | 2021-03-26 | 中国水利水电科学研究院 | Underwater elastic wave full wave field nondestructive detection system and method |
| CN112557500B (en) * | 2020-11-05 | 2022-01-28 | 中国水利水电科学研究院 | Underwater elastic wave full wave field nondestructive detection system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20060201252A1 (en) | Angle beam shear wave through-transmission ultrasonic testing apparatus and method | |
| CN103940908B (en) | Based on DBSCAN and the supersonic detection device of cross correlation algorithm and method | |
| CN101839895A (en) | Near-surface defect recognition method based on ultrasonic TOFD | |
| CN111189922B (en) | Three-dimensional visual detection method and device for sleeve grouting compactness | |
| CN102914593A (en) | Method for detecting ultrasonic TOFD (time of flight diffraction) imaging of shaft pressing position | |
| CN105954356A (en) | Finite amplitude technology-based metal block closed crack detecting and positioning method | |
| CN110145653A (en) | A kind of pipeline intelligent detection robot and detection method | |
| CN104597083A (en) | Ultrasonic guided wave and electromechanical impedance-based mobile damage detection method | |
| CN102830165B (en) | Structural-dynamic-response jacket platform damage diagnosis method | |
| CN107340334A (en) | Damage detecting method in a kind of underwater foundation body | |
| CN106501285B (en) | The equipment and detection method of the mud jacking compactness of non-destructive testing prestress pipe | |
| CN104374830A (en) | Near field phased array structure health monitoring method based on piezoelectric array | |
| CN111579645A (en) | Nondestructive testing device and method for underwater near-source wave field | |
| CN111456121A (en) | Method for nondestructive detection of bridge pile foundation defects | |
| JP2002214206A (en) | System for assessing metal deterioration on maritime vessels | |
| RU2526579C2 (en) | Testing of in-pipe inspection instrument at circular pipeline site | |
| US4628737A (en) | Method and device for locating and characterizing flaws in a known, submerged metal structure | |
| CN1333265C (en) | Back-cupping method and device for sound emission source signal in sound emission detection technology | |
| CN212646579U (en) | Underwater near-source wave field nondestructive testing device | |
| CN105866247A (en) | Device and method for detecting sticking compactness of steel plate | |
| Ozevin | Geometry-based spatial acoustic source location for spaced structures | |
| CN210194704U (en) | Double-measuring-point low-strain integrity detection device for pile top and hole of foundation pile | |
| RU177780U1 (en) | Device for automated ultrasonic testing of welded joints | |
| CN107064294B (en) | Data acquisition device of submarine sediment in-situ acoustic measurement system | |
| CN113093307A (en) | Dipole transmitting transducer testing device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |