CN115219597A - Thin wall concrete structure stress state ultrasonic transverse wave detecting system - Google Patents

Thin wall concrete structure stress state ultrasonic transverse wave detecting system Download PDF

Info

Publication number
CN115219597A
CN115219597A CN202210840661.XA CN202210840661A CN115219597A CN 115219597 A CN115219597 A CN 115219597A CN 202210840661 A CN202210840661 A CN 202210840661A CN 115219597 A CN115219597 A CN 115219597A
Authority
CN
China
Prior art keywords
ultrasonic
signal
spectrogram
thin
transverse wave
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
Application number
CN202210840661.XA
Other languages
Chinese (zh)
Inventor
王陶
郑康琳
蔡秋香
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Research Institute of Highway Ministry of Transport
Original Assignee
Research Institute of Highway Ministry of Transport
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Research Institute of Highway Ministry of Transport filed Critical Research Institute of Highway Ministry of Transport
Priority to CN202210840661.XA priority Critical patent/CN115219597A/en
Publication of CN115219597A publication Critical patent/CN115219597A/en
Pending legal-status Critical Current

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
    • G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
    • 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
    • G01N2291/01—Indexing codes associated with the measuring variable
    • G01N2291/011—Velocity or travel time
    • 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
    • G01N2291/02827—Elastic parameters, strength or force
    • 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
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/042—Wave modes
    • G01N2291/0422—Shear waves, transverse waves, horizontally polarised waves

Abstract

The invention provides an ultrasonic transverse wave detection system for a thin-wall concrete structure in a stress state, which comprises: the transmitting end is used for converting a first electric signal into a corresponding first ultrasonic signal and injecting the first ultrasonic signal into the thin-wall concrete to be tested from one side of each selected test position of the thin-wall concrete to be tested; the receiving end is used for receiving a second ultrasonic signal emitted from the other side of each selected test position of the thin-wall concrete to be tested, converting the second ultrasonic signal into a corresponding second electric signal, and calculating the structural stress of the thin-wall concrete to be tested based on the first ultrasonic signal and the second ultrasonic signal; the method is used for solving the problems of poor material uniformity, high ultrasonic signal loss, large stress measurement error and the like when the traditional ultrasonic method is applied to concrete stress test, thereby improving the stress test accuracy and accurately measuring the actual stress state of thin-wall members such as reinforced concrete beam wing plates, web plates and the like.

Description

Thin wall concrete structure stress state ultrasonic transverse wave detecting system
Technical Field
The invention relates to the technical field of concrete structure safety detection and evaluation, in particular to a thin-wall concrete structure stress state ultrasonic transverse wave detection system.
Background
At present, the stress state of a concrete structure is an important index for detecting and evaluating the safety of the structure. Stress measurement methods are classified into two major categories, namely, a destructive method and a nondestructive method. Nondestructive methods are classified into a radiation diffraction method, a magnetic method, an acoustic elastic method, and the like according to the detection means. The acoustoelastic method is very similar to the photoelastic method, and measures the average stress of the ultrasonic wave propagation path by using the tiny change of the ultrasonic wave speed in the elastic medium along with the stress influence. The acoustoelastic effect was originally proposed by s.oka, and d.s.hughes and j.l.kelly established the relationship between the speed and stress when ultrasonic waves propagate in materials according to the finite deformation theory, and laid the theoretical basis for ultrasonic stress measurement. The method is concerned by people because the detected object is not damaged. In recent years, the method is widely applied to the aspects of residual stress detection of metal materials and flaw detection of composite materials.
Because the concrete is a mixed material with complex components, the ultrasonic method is used for the influence of factors such as a plurality of influence factors, high signal loss, large parameter error and the like in the concrete stress test. The method is difficult to apply in the aspects of stress test accuracy and applicability. For example, in the fields of nondestructive inspection, residual stress and the like, an ultrasonic detection technology is adopted, and the stress measurement error is large and is difficult to be practical due to the fact that the uniformity of materials in concrete is poor, the absolute stress value is not high and the like.
The method aims at the problems that the ultrasonic method is difficult to apply due to poor material uniformity, high ultrasonic signal loss, large stress measurement error and the like when applied to concrete stress test. The invention provides an ultrasonic transverse wave detection system for a thin-wall concrete structure in a stress state, which is used for solving the problems. Therefore, the stress test accuracy is improved, and the test method is programmed and standardized.
Disclosure of Invention
The invention provides an ultrasonic transverse wave detection system for a stress state of a thin-wall concrete structure, which is used for solving the problems of poor material uniformity, high ultrasonic signal loss, large stress measurement error and the like when the traditional ultrasonic method is applied to concrete stress test, so that the stress test accuracy is improved, the test method is programmed and standardized, the test process is simple, the test method is clear, and the actual working stress state of thin-wall components such as reinforced concrete beam wing plates, web plates and the like can be accurately measured.
The invention provides a thin wall concrete structure stress state ultrasonic transverse wave detecting system, including:
the transmitting end is used for converting a first electric signal into a corresponding first ultrasonic signal and injecting the first ultrasonic signal into the thin-wall concrete to be tested from one side of each selected test position of the thin-wall concrete to be tested;
and the receiving end is used for receiving a second ultrasonic signal emitted from the other side of each selected test position of the thin-wall concrete to be tested, converting the second ultrasonic signal into a corresponding second electric signal, and calculating the structural stress of the thin-wall concrete to be tested based on the first electric signal and the second electric signal.
Preferably, the transmitting end includes:
the pulse signal source is used for generating a preset pulse electric signal;
the signal amplifier is used for amplifying a preset pulse electric signal according to a preset amplification factor to obtain a corresponding first electric signal;
and the first transverse wave ultrasonic transducer is used for converting the first electric signal into a corresponding first ultrasonic signal and injecting the first ultrasonic signal into the thin-wall concrete to be tested from one side of each selected test position of the thin-wall concrete to be tested.
Preferably, the first shear wave ultrasonic transducer includes:
the first energy conversion unit is used for converting the first electric signal into a corresponding first ultrasonic signal;
and the first transverse wave ultrasonic transducer probe is used for injecting the first ultrasonic signal into the thin-wall concrete to be tested from one side of each selected test position of the thin-wall concrete to be tested.
Preferably, the receiving end includes:
the second transverse wave ultrasonic transducer is used for receiving a second ultrasonic signal emitted from the other side of each selected test position of the thin-wall concrete to be tested and converting the second ultrasonic signal into a corresponding second electric signal;
the signal oscilloscope is used for receiving and displaying the first electric signal and the second electric signal;
and the data storage processor is used for receiving and storing the first electric signal and the second electric signal, obtaining ultrasonic propagation time based on comparison of the first electric signal and the second electric signal, and calculating the structural stress of the thin-wall concrete to be measured based on the ultrasonic propagation time.
Preferably, the second shear wave ultrasonic transducer includes:
the second transverse wave ultrasonic transducer probe is used for receiving a second ultrasonic signal emitted from the other side of each selected test position of the thin-wall concrete to be tested;
and the second transduction unit is used for converting the second ultrasonic signal into a corresponding second electric signal.
Preferably, the first transverse wave ultrasonic transducer probe and the second transverse wave ultrasonic transducer probe are arranged on the slide rail tool in a transmission mode through probes, the first transverse wave ultrasonic transducer probe and the slide rail tool are fixedly arranged, and the second transverse wave ultrasonic transducer probe slides along the tool rail;
the distance from the first shear wave ultrasound transducer probe and the second shear wave ultrasound transducer probe is measured by the length scale.
Preferably, the data storage processor includes:
step 1: determining wing plate positions meeting the beam end zero boundary stress condition, and arranging the combined ultrasonic transducers on two sides of the wing plate positions in a butt-measuring mode;
step 2: rotating the first transverse wave transducer probe and the second transverse wave ultrasonic transducer probe synchronously based on the angle, and determining the first transverse wave speed with mutually vertical sensor polarization directions based on the current ultrasonic transmission time of the first ultrasonic signal and the second ultrasonic signal
Figure BDA0003750299890000031
And second shear wave velocity
Figure BDA0003750299890000032
And step 3: based on the first shear waveSpeed measuring device
Figure BDA0003750299890000033
And the second shear wave velocity
Figure BDA0003750299890000034
Calculating the first average wave velocity
Figure BDA0003750299890000035
Figure BDA0003750299890000036
In the formula (I), the compound is shown in the specification,
Figure BDA0003750299890000037
is the first average wave velocity;
and 4, step 4: determining a target structure stress test position, and arranging the combined ultrasonic transducers on two sides of the target structure stress test position in a butt-testing manner;
and 5: synchronously rotating the first transverse wave transducer probe and the second transverse wave ultrasonic transducer probe based on angle rotary teeth according to a preset interval degree until the polarization direction of a sensor on the second transverse wave ultrasonic transducer is parallel to the stress direction, and determining the maximum transverse wave velocity v based on the current ultrasonic propagation time of the first ultrasonic signal and the second ultrasonic signal z1 Simultaneously, recording a first rotation angle on the angle scale;
step 6: determining a first rotation angle range based on the first rotation angle, starting from a lower limit value of the first rotation angle range according to a preset interval degree, synchronously rotating the first transverse wave transducer probe and the second transverse wave ultrasonic transducer probe based on the angle rotation teeth until the polarization direction of a sensor on the second transverse wave ultrasonic transducer is perpendicular to the stress direction, and determining the minimum transverse wave velocity v based on the current ultrasonic propagation time of the first ultrasonic signal and the second ultrasonic signal z2 ；
And 7: based on the maximum shear wave velocity v z1 And said minimum shear wave velocity v z2 Calculating a second average wave velocity v T ：
Figure BDA0003750299890000041
In the formula, v T A second average wave velocity;
and step 8: based on the first average wave velocity, the second average wave velocity and the maximum shear wave velocity v z1 And the minimum shear wave velocity v z2 And calculating the structural stress of the target structural stress test position:
Figure BDA0003750299890000042
Figure BDA0003750299890000043
in the formula, σ 1 And σ 1 For v under the plane strain state of the thin-wall concrete to be measured z1 And v z2 Stress in polarization direction, σ 1 And σ 1 In units of MPa, v T The second average wave velocity is the velocity of the second average wave,
Figure BDA0003750299890000044
is the first average wave velocity, C T The transverse wave acoustic elastic coefficient of the material of the thin-wall concrete to be tested at the stress test position of the target structure, and C T Has a unit of (MPa) -1 ，v z1 Is the maximum shear wave velocity, v z2 At the minimum shear wave velocity, C A The material transverse wave acoustic elastic birefringence coefficient of the thin-wall concrete to be tested at the stress test position of the target structure, and C A Has a unit of (MPa) -1 。
Preferably, the maximum shear wave velocity v is determined on the basis of the current ultrasound propagation times of the first and second ultrasound signals z1 The method comprises the following steps:
the frequency spectrum naming subunit is configured to output a first signal spectrogram of the first electrical signal and a second signal spectrogram of the second electrical signal when the angle rotation tooth is at the first rotation angle, use the first signal spectrogram as a reference spectrogram, and use the second signal spectrogram as a spectrogram to be corrected corresponding to the first reference spectrogram;
the signal denoising subunit is configured to denoise the signal spectrogram corresponding to the reference spectrogram to obtain a corresponding denoised spectrogram;
the fourth calculating subunit is configured to calculate a first peak average value and a first trough average value corresponding to the de-noising spectrogram, and at the same time, calculate a second peak average value and a second trough average value corresponding to the spectrogram to be corrected;
a fifth calculating subunit, configured to calculate a first difference between the first peak average and the second peak average and a second difference between the first valley average and the second valley average, calculate a third difference between the first peak average and the first valley average, and calculate a longitudinal scaling multiple corresponding to the spectrogram to be corrected based on a first ratio between the first difference and the third difference and a second ratio between the second difference and the third difference;
the frequency determining subunit is configured to determine all zero-crossing points in the denoised spectrogram, obtain a corresponding first zero-crossing sequence, determine a corresponding first vibration frequency based on the first zero-crossing sequence, determine all zero-crossing points in the spectrogram to be corrected, obtain a corresponding second zero-crossing sequence, and determine a corresponding second vibration frequency based on the second zero-crossing sequence;
a sixth calculating subunit, configured to calculate a corresponding lateral scaling factor based on the first vibration frequency and the second vibration frequency;
the spectrum fitting subunit is used for fitting a corresponding fitted signal spectrogram based on the longitudinal scaling factor, the transverse scaling factor and the de-noised spectrogram;
the local corrector subunit is used for carrying out local correction on the spectrogram to be corrected based on the fitted signal spectrogram to obtain a corresponding corrected spectrogram;
a spectrum output subunit, configured to use the denoised spectrogram corresponding to the reference spectrogram as a corresponding first corrected spectrogram, and use a corrected spectrogram corresponding to the first to-be-corrected spectrogram as a corresponding second corrected spectrogram;
a speed determining subunit, configured to obtain a current ultrasonic propagation time based on the first correction frequency spectrum and the second correction frequency spectrum, and determine a maximum shear wave speed v based on the current ultrasonic propagation time z1 。
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of an ultrasonic transverse wave detection system for a thin-wall concrete structure in a stress state according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a transmitting end according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a first shear wave ultrasonic transducer in accordance with an embodiment of the present invention;
fig. 4 is a schematic diagram of a receiving end according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a second shear wave ultrasonic transducer in accordance with an embodiment of the present invention;
FIG. 6 is a diagram of a signal syndrome unit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a fastening scheme of a combined shear wave ultrasonic transducer according to an embodiment of the present invention;
FIG. 8 is a front view of a test tool for a combined shear wave ultrasonic transducer according to an embodiment of the present invention;
FIG. 9 is a side view of a test fixture for a combined shear wave ultrasonic transducer in accordance with an embodiment of the present invention;
FIG. 10 is a top view of a test fixture for a combined shear wave ultrasonic transducer in accordance with an embodiment of the present invention;
FIG. 11 is a perspective view of a contact transmission method for testing the stress of a reinforced concrete beam according to an embodiment of the present invention;
FIG. 12 is a schematic diagram illustrating a contact type transmission method for testing a reinforced concrete beam stress test wing plate according to an embodiment of the present invention;
FIG. 13 is an enlarged structural view of the wing plate position in thin-walled concrete according to an embodiment of the present invention;
FIG. 14 is a schematic diagram illustrating the maximum transverse wave velocity when the polarization direction of a sensor is parallel to the stress direction according to an embodiment of the present invention;
fig. 15 is a schematic diagram illustrating a minimum transverse wave velocity when a polarization direction of a sensor is perpendicular to a stress direction according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
The invention provides an ultrasonic transverse wave detection system for a thin-wall concrete structure in a stress state, which is shown in figures 1, 11 and 12 and comprises the following components:
the transmitting end is used for converting a first electric signal into a corresponding first ultrasonic signal and injecting the first ultrasonic signal into the thin-wall concrete to be tested from one side of each selected test position of the thin-wall concrete to be tested;
and the receiving end is used for receiving a second ultrasonic signal emitted from the other side of each selected test position of the thin-wall concrete to be tested, converting the second ultrasonic signal into a corresponding second electric signal, and calculating the structural stress of the thin-wall concrete to be tested based on the first electric signal and the second electric signal.
In this embodiment, the first electrical signal is an electrical signal obtained by amplifying a pulsed electrical signal generated based on a pulsed signal source by a signal amplifier.
In this embodiment, the first ultrasonic signal is a corresponding ultrasonic signal converted from the first electrical signal based on the first shear wave ultrasonic transducer.
In this embodiment, the selected test positions are wing plates and web plates, refer to fig. 11 and 12, 13, 14, and 15 in fig. 14 are the selected test positions, 13 is the selected mid-span wing plate position, 14 is the wing plate position satisfying zero boundary stress, 15 is the selected web plate position, 11 is the mid-span cross section of the thin-walled concrete to be tested, 12 is the beam end cross section, and 16 in fig. 12 is the reinforced concrete beam.
In this embodiment, the thin-walled concrete to be tested is the thin-walled concrete of the tested structural stress state in the invention.
In this embodiment, the second ultrasonic signal is an ultrasonic signal emitted after the first ultrasonic signal penetrates through each preset selected test position of the thin-wall concrete to be tested.
In this embodiment, the second electrical signal is an electrical signal into which the second ultrasonic signal is converted.
In this embodiment, the system for detecting the stress state of the thin-walled concrete structure by using ultrasonic transverse waves comprises: the ultrasonic transducer comprises a pulse signal source, a signal amplifier, a channel selection switch, a combined transverse wave ultrasonic transducer, a signal oscilloscope and a data storage processor. The system work flow is as follows:
step 1, generating a pulse electric signal by a pulse signal source, amplifying the pulse electric signal by a signal amplifier to obtain a first electric signal, transmitting the first electric signal to the combined transverse wave ultrasonic transducer on one side, and simultaneously transmitting the first electric signal to the signal oscilloscope and the data storage processor for displaying and storing the first electric signal respectively;
step 2, the combined ultrasonic transducer on one side converts the first electric signal into ultrasonic waves, the ultrasonic waves transmit the concrete to the combined ultrasonic transducer on the other side and are converted into a second electric signal, and the second electric signal is simultaneously transmitted to the signal oscilloscope and the data storage processor and is respectively used for displaying and storing the second electric signal;
step 3, the data storage processor compares the first wave sound of the first electric signal and the second electric signal to obtain the ultrasonic propagation travel time;
and 4, completing the test of the state of the current stage, and entering the test of the stress state of the next stage of the concrete.
The beneficial effects of the above technology are: the problems of poor material uniformity, high ultrasonic signal loss, large stress measurement error and the like in the application of a traditional ultrasonic method in concrete stress test are solved, so that the stress test accuracy is improved, the test method is programmed and standardized, the test process is simple, the test method is clear, and the actual structural stress state of thin-wall members such as reinforced concrete beam wing plates, web plates and the like can be accurately measured.
Example 2:
on the basis of embodiment 1, the transmitting end, referring to fig. 2 and 7, includes:
the pulse signal source is used for generating a preset pulse electric signal;
the signal amplifier is used for amplifying a preset pulse electric signal according to a preset amplification factor to obtain a corresponding first electric signal;
and the first transverse wave ultrasonic transducer is used for converting the first electric signal into a corresponding first ultrasonic signal and injecting the first ultrasonic signal into the thin-wall concrete to be tested from one side of each selected test position of the thin-wall concrete to be tested.
In this embodiment, the preset pulse electrical signal is specifically set according to actual conditions.
In this embodiment, referring to fig. 7, a transducer card slot 7 is provided between the first shear wave ultrasonic transducer 6 and the second shear wave ultrasonic transducer 6.
The beneficial effects of the above technology are: the process that ultrasonic waves are emitted from one side of the thin-wall concrete to be detected is completed, and a foundation is provided for detecting the structural stress state of the thin-wall concrete to be detected based on ultrasonic transverse waves.
Example 3:
on the basis of embodiment 2, the first shear wave ultrasonic transducer, with reference to fig. 3, includes:
the first energy conversion unit is used for converting the first electric signal into a corresponding first ultrasonic signal;
and the first transverse wave ultrasonic transducer probe is used for injecting the first ultrasonic signal into the thin-wall concrete to be tested from one side of each selected test position of the thin-wall concrete to be tested.
The beneficial effects of the above technology are: the transduction from the electric signal to the ultrasonic signal is completed based on the first transduction unit, and the emission process of the first ultrasonic signal is completed based on the first transverse wave ultrasonic transducer probe.
Example 4:
on the basis of embodiment 3, the receiving end, with reference to fig. 4 and 7, includes:
the second transverse wave ultrasonic transducer is used for receiving a second ultrasonic signal emitted from the other side of each selected test position of the thin-wall concrete to be tested and converting the second ultrasonic signal into a corresponding second electric signal;
the signal oscilloscope is used for receiving and displaying the first electric signal and the second electric signal;
and the data storage processor is used for receiving and storing the first electric signal and the second electric signal, obtaining ultrasonic propagation time based on comparison of the first electric signal and the second electric signal, and calculating the structural stress of the thin-wall concrete to be measured based on the ultrasonic propagation time.
In this embodiment, referring to fig. 7, a transducer card slot 7 is provided between the first shear wave ultrasonic transducer 6 and the second shear wave ultrasonic transducer 6.
The beneficial effects of the above technology are: the ultrasonic transducer realizes transduction from an ultrasonic signal to an electric signal based on the second transverse wave ultrasonic transducer, realizes the visualization function of the electric signal based on the signal oscilloscope, realizes the storage and processing of the electric signal based on the data storage processor, and calculates the structural stress of the thin wall to be measured in coagulation.
Example 5:
on the basis of embodiment 4, the second shear wave ultrasonic transducer, with reference to fig. 5, includes:
the second transverse wave ultrasonic transducer probe is used for receiving a second ultrasonic signal emitted from the other side of each selected test position of the thin-wall concrete to be tested;
and the second transduction unit is used for converting the second ultrasonic signal into a corresponding second electric signal.
The beneficial effects of the above technology are: the ultrasonic transducer probe based on the second transverse wave realizes the receiving of the ultrasonic signals emitted from the other side of each preset selected test position of the thin-wall concrete to be tested, and realizes the conversion of the ultrasonic signals into corresponding electric signals based on the second energy conversion unit.
Example 6:
on the basis of embodiment 5, referring to fig. 6 and 7 to 12, the first shear wave transducer probe and the second shear wave transducer probe are installed on a slide rail tool (refer to fig. 10 to 15) in a probe-to-probe transmission manner, the first shear wave transducer probe is fixedly installed with the slide rail tool, and the second shear wave transducer probe slides along a tool rail;
the distance between the first shear wave ultrasonic transducer probe and the second shear wave ultrasonic transducer probe is measured by the length scale 8 (the length scale 8 is provided with a length fixing bolt 10).
In this embodiment, the first transverse wave transducer probe and the second transverse wave ultrasonic transducer probe rotate precisely within a range of 0 ° to 135 ° to capture a birefringence effect of the ultrasonic wave due to stress, so as to obtain a more accurate vibration energy difference.
In this embodiment, the scheme of the combined shear wave ultrasonic transducer is as follows:
two transverse wave transducer probes which are arranged in a butt-measuring mode are adopted, a sliding tool and a fastener 5 are adopted, one probe is fixed, the other probe can be adjusted and fixed in a sliding mode along the longitudinal direction of the sliding tool, and the distance between the probes is measured by a length scale 8;
the main vibration directions of the first transverse wave transducer probe and the second transverse wave transducer probe are arranged consistently and can be accurately rotated and fixed within the range of 0-135 degrees, and the angle rotary teeth 3 (fixed on the fastening piece 5 by the angle fixing bolt 4) adjust the rotation angle and are measured by the angle scale 9. Ensuring the coordination and consistency of the main vibration directions of the transverse wave transducer after rotation so as to obtain the excitation and the reception of the ultrasonic waves in two vertical directions in the concrete;
the elastic rubber pad 1 between the transducer and the fastener 5 isolates vibration, the transducer can only slide in the cavity of the fastener 5 through the clamping groove and cannot rotate, and the spring 2 at the bottom of the transducer compresses the contact surface of the transducer and concrete.
The beneficial effects of the above technology are: the embodiment describes a transmission test arrangement scheme with a transverse wave combined ultrasonic transducer, a probe fastening and tooling mode, an ultrasonic probe with an adjustable sensing angle and a measurable distance, and provides a foundation for detecting the structural stress state of thin-wall concrete to be detected based on ultrasonic transverse waves.
Example 7:
on the basis of embodiment 6, the data storage processor, referring to fig. 7, 11, 13, 14, 15, includes:
step 1: determining the wing plate position meeting the beam end zero boundary stress condition, and arranging the combined ultrasonic transducers on two sides of the wing plate position in a butt-measuring manner;
step 2: rotating the first transverse wave transducer probe and the second transverse wave ultrasonic transducer probe synchronously based on the angle, and determining the first transverse wave speed with mutually vertical sensor polarization directions based on the current ultrasonic transmission time of the first ultrasonic signal and the second ultrasonic signal
Figure BDA0003750299890000111
And second shear wave velocity
Figure BDA0003750299890000121
And step 3: based on the firstVelocity of transverse wave
Figure BDA0003750299890000122
And the second shear wave velocity
Figure BDA0003750299890000123
Calculating the first average wave velocity
Figure BDA0003750299890000124
Figure BDA0003750299890000125
In the formula (I), the compound is shown in the specification,
Figure BDA0003750299890000126
is the first average wave velocity;
and 4, step 4: determining a target structure stress test position, and arranging the combined ultrasonic transducers on two sides of the target structure stress test position in a butt-testing manner;
and 5: synchronously rotating the first transverse wave transducer probe and the second transverse wave ultrasonic transducer probe based on angle rotary teeth according to a preset interval degree until the polarization direction of a sensor on the second transverse wave ultrasonic transducer is parallel to the stress direction, and determining the maximum transverse wave velocity v based on the current ultrasonic propagation time of the first ultrasonic signal and the second ultrasonic signal z1 Simultaneously, recording a first rotation angle on the angle scale;
and 6: determining a first rotation angle range based on the first rotation angle, starting from a lower limit value of the first rotation angle range according to a preset interval degree, synchronously rotating the first transverse wave transducer probe and the second transverse wave ultrasonic transducer probe based on the angle rotation teeth until a sensor polarization direction on the second transverse wave ultrasonic transducer is perpendicular to a stress direction, and determining a minimum transverse wave velocity v based on the current ultrasonic propagation time of the first ultrasonic signal and the second ultrasonic signal z2 ；
And 7: based on the maximum shear wave velocity v z1 And the minimum shear wave velocity v z2 Calculating a second average wave velocity v T ：
Figure BDA0003750299890000127
In the formula, v T A second average wave velocity;
and 8: based on the first average wave velocity, the second average wave velocity and the maximum shear wave velocity v z1 And the minimum shear wave velocity v z2 And calculating the structural stress of the target structural stress test position:
Figure BDA0003750299890000128
Figure BDA0003750299890000131
in the formula, σ 1 And σ 1 For the v under the plane strain state of the thin-wall concrete to be measured z1 And v z2 Stress in polarization direction, σ 1 And σ 1 In units of MPa (i.e. megapascals), v T The second average wave velocity is the velocity of the second average wave,
Figure BDA0003750299890000132
is the first average wave velocity, C T The transverse wave acoustic elastic coefficient of the material of the thin-wall concrete to be tested at the stress test position of the target structure, and C T Has a unit of (MPa) -1 (i.e. negative in MPa), v z1 Is the maximum shear wave velocity, v z2 At the minimum shear wave velocity, C A The material transverse wave acoustic elastic birefringence coefficient of the thin-wall concrete to be tested at the stress test position of the target structure, and C A Has a unit of (MPa) -1 。
In this embodiment, the position of the wing plate determined to satisfy the beam-end zero boundary stress condition is the position 14 in fig. 11, and is also the position in fig. 13 (which is an enlarged structure of the position 14 in fig. 11).
In this embodiment, the predetermined interval is, for example, 5 degrees.
In this embodiment, the first shear wave velocity
Figure BDA0003750299890000133
Namely: and when the position of the wing plate meeting the condition of zero boundary stress at the beam end is tested, the wave velocity of the transverse wave corresponding to one polarization direction in the mutually perpendicular sensor polarization directions.
In this embodiment, the second shear wave velocity
Figure BDA0003750299890000134
Namely: and when the position of the wing plate meeting the condition of zero boundary stress at the beam end is tested, the wave velocity of the transverse wave corresponding to the other polarization direction in the mutually perpendicular sensor polarization directions.
In this embodiment, the target structure stress test location is, for example, location 13 (midspan) or location 15 (web) in fig. 11.
In this embodiment, referring to FIG. 14, the maximum shear wave velocity v z1 Namely, when the stress test position of the target structure is measured and the polarization direction of the sensor on the second transverse wave ultrasonic transducer is parallel to the stress direction, the wave velocity value of the ultrasonic wave at the stress test position of the target structure is determined based on the current ultrasonic propagation of the first ultrasonic signal and the second ultrasonic signal.
In this embodiment, the first rotation angle is an angle displayed by the angle scale when the polarization direction of the sensor on the second shear wave ultrasonic transducer is parallel to the stress direction when the stress test position of the target structure is measured.
In this embodiment, the first rotation angle range is a range formed by adding 80 degrees to 110 degrees to the first rotation angle, for example: the first rotation angle is 10 degrees, and the first rotation angle range is: 90 to 120 degrees.
In this embodiment, the lower limit value of the first rotation angle range is the lower limit value of the first rotation angle range.
In this embodiment, referring to FIG. 15, the minimum shear wave velocity v z2 The method includes the steps that when a stress test position of a target structure is measured, and the polarization direction of a sensor on a second transverse wave ultrasonic transducer is perpendicular to the stress direction, the wave velocity value of ultrasonic waves at the stress test position of the target structure is determined based on the current ultrasonic transmission of a first ultrasonic signal and a second ultrasonic signal.
The beneficial effects of the above technology are: the method can accurately retrieve the maximum transverse wave velocity and the minimum transverse wave velocity based on the synchronous rotation of the first transverse wave transducer probe and the second transverse wave transducer probe, further enable the calculated structural stress of a target structural stress test position to be more accurate, and can accurately calculate the actual structural stress state of the thin-wall concrete based on the maximum transverse wave velocity when the polarization direction of a sensor on the second transverse wave ultrasonic transducer at a wing plate position meeting the condition of zero boundary stress at a beam end is parallel to the stress direction and the minimum transverse wave velocity when the polarization direction of the sensor on the second transverse wave ultrasonic transducer at the target structural stress test position is perpendicular to the stress direction, and the maximum transverse wave velocity when the polarization direction of the sensor on the second transverse wave ultrasonic transducer is parallel to the stress direction and the minimum transverse wave velocity when the polarization direction of the sensor on the second transverse wave ultrasonic transducer is perpendicular to the stress direction.
Example 8:
on the basis of embodiment 7, the maximum shear wave velocity v is determined based on the current ultrasound propagation travel times of the first and second ultrasound signals z1 Referring to fig. 6, includes:
the frequency spectrum naming subunit is configured to output a first signal spectrogram of the first electrical signal and a second signal spectrogram of the second electrical signal when the angle rotation tooth is at the first rotation angle, use the first signal spectrogram as a reference spectrogram, and use the second signal spectrogram as a spectrogram to be corrected corresponding to the first reference spectrogram;
the signal denoising subunit is configured to denoise the signal spectrogram corresponding to the reference spectrogram to obtain a corresponding denoised spectrogram;
the fourth calculating subunit is configured to calculate a first peak average value and a first trough average value corresponding to the denoised spectrogram, and at the same time, calculate a second peak average value and a second trough average value corresponding to the spectrogram to be corrected;
a fifth calculating subunit, configured to calculate a first difference between the first peak average and the second peak average and a second difference between the first valley average and the second valley average, calculate a third difference between the first peak average and the first valley average, and calculate a longitudinal scaling factor corresponding to the spectrogram to be corrected based on a first ratio of the first difference and the third difference and a second ratio of the second difference and the third difference;
the frequency determining subunit is configured to determine all zero-crossing points in the denoised spectrogram, obtain a corresponding first zero-crossing sequence, determine a corresponding first vibration frequency based on the first zero-crossing sequence, determine all zero-crossing points in the spectrogram to be corrected, obtain a corresponding second zero-crossing sequence, and determine a corresponding second vibration frequency based on the second zero-crossing sequence;
a sixth calculating subunit, configured to calculate a corresponding lateral scaling factor based on the first vibration frequency and the second vibration frequency;
the spectrum fitting subunit is used for fitting a corresponding fitted signal spectrogram based on the longitudinal scaling factor, the transverse scaling factor and the de-noised spectrogram;
the local corrector subunit is used for carrying out local correction on the spectrogram to be corrected based on the fitted signal spectrogram to obtain a corresponding corrected spectrogram;
the spectrum output subunit is configured to use the denoised spectrogram corresponding to the reference spectrogram as a corresponding first corrected spectrogram, and use the corrected spectrogram corresponding to the first to-be-corrected spectrogram as a corresponding second corrected spectrogram;
a velocity determination subunit, configured to obtain a current ultrasonic propagation time based on the first correction frequency spectrum and the second correction frequency spectrum, and determine a maximum shear wave velocity v based on the current ultrasonic propagation time z1 。
In this embodiment, the first signal spectrogram is a signal spectrogram of the first electrical signal when the angle-rotation tooth is at the first rotation angle.
In this embodiment, the second signal spectrogram is a signal spectrogram of the second electrical signal when the angle-rotation tooth is at the first rotation angle.
In this embodiment, the reference spectrogram is the first signal spectrogram.
In this embodiment, the spectrogram to be corrected is the second signal spectrogram.
In this embodiment, the denoised spectrogram is a signal spectrogram obtained by denoising a signal spectrogram corresponding to the reference spectrogram.
In this embodiment, the first peak average value is an average value of all peak values in the denoised spectrogram.
In this embodiment, the first trough average value is an average value of all trough values in the denoising spectrogram.
In this embodiment, the second peak average value is an average value of all peak values in the spectrogram to be corrected.
In this embodiment, the second valley average value is an average value of all valley values in the spectrogram to be corrected.
In this embodiment, the first difference is a difference between the average of the first peak and the average of the second peak.
In this embodiment, the second difference is a difference between the first valley average and the second valley average.
In this embodiment, the third difference is the difference between the first peak average and the first valley average.
In this embodiment, the first ratio is a ratio of the first difference to the third difference.
In this embodiment, the second ratio is a ratio of the second difference to the third difference.
In this embodiment, the vertical scaling factor is the sum of the first ratio and the second ratio.
In this embodiment, the zero crossing point is an intersection point of a signal diagram and a time axis in the denoised spectrogram.
In this embodiment, the first zero-crossing sequence is a sequence formed by all zero-crossings in the denoising spectrogram.
In this embodiment, the first vibration frequency is a ratio of 1 to an average value based on time differences between all adjacent zero-crossing points included in the first zero-crossing sequence.
In this embodiment, the second zero-crossing sequence is a sequence formed by all zero-crossings in the spectrogram to be corrected.
In this embodiment, the second vibration frequency is a ratio of 1 to an average value based on time differences between all adjacent zero-crossing points included in the second zero-crossing point sequence.
In this embodiment, fitting a corresponding fitted signal spectrogram based on the longitudinal scaling factor, the transverse scaling factor, and the denoised spectrogram includes:
and longitudinally zooming the de-noised spectrogram based on a longitudinal zoom factor, and transversely zooming the de-noised spectrogram based on a transverse zoom factor to obtain a corresponding fitted signal spectrogram.
In this embodiment, the partially correcting the spectrogram to be corrected based on the fitted signal spectrogram to obtain a corresponding corrected spectrogram includes:
aligning the time sequence of the fitted signal spectrogram and the spectrogram to be corrected to obtain a corresponding aligned spectrogram;
and determining a signal amplitude difference value corresponding to each moment of the fitted signal spectrogram and the spectrogram to be corrected based on the aligned spectrograms, and when the signal amplitude difference value is greater than a difference threshold value, setting the signal amplitude of the spectrogram to be corrected at the corresponding moment to be a signal amplitude average value based on the fitted signal spectrogram and the spectrogram to be corrected at the corresponding moment, so as to obtain the corresponding corrected spectrogram.
In this embodiment, the maximum shear wave velocity v is determined based on the current ultrasound propagation travel time z1 Namely: dividing the probe distance between the first transverse wave ultrasonic transducer probe and the second transverse wave ultrasonic transducer probe measured by the length scale by the current ultrasonic propagation time to obtain the maximum transverse wave velocity v z1 。
The beneficial effects of the above technology are: the method comprises the steps of denoising a reference spectrogram to obtain a corresponding reference denoised spectrogram, denoising the reference spectrogram, determining a scaling ratio between the spectrogram to be corrected and the reference denoised spectrogram based on a difference value of a peak value and a trough value between the spectrogram to be corrected and the reference denoised spectrogram and a difference value of a zero crossing point, fitting a standard fitting signal spectrogram corresponding to the spectrogram to be corrected based on the scaling ratio, denoising and correcting the spectrogram to be corrected based on the fitting signal spectrogram, and ensuring the accuracy of the structural stress state of the thin-wall concrete to be detected based on ultrasonic transverse wave detection.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (8)

1. The utility model provides a thin wall concrete structure stress state ultrasonic transverse wave detecting system which characterized in that includes:
the transmitting end is used for converting a first electric signal into a corresponding first ultrasonic signal and injecting the first ultrasonic signal into the thin-wall concrete to be tested from one side of each selected test position of the thin-wall concrete to be tested;
and the receiving end is used for receiving a second ultrasonic signal emitted from the other side of each selected test position of the thin-wall concrete to be tested, converting the second ultrasonic signal into a corresponding second electric signal, and calculating the structural stress of the thin-wall concrete to be tested based on the first electric signal and the second electric signal.
2. The system for detecting the stress state ultrasonic transverse wave of the thin-walled concrete structure according to claim 1, wherein the transmitting end comprises:
the pulse signal source is used for generating a preset pulse electric signal;
the signal amplifier is used for amplifying a preset pulse electric signal according to a preset amplification factor to obtain a corresponding first electric signal;
and the first transverse wave ultrasonic transducer is used for converting the first electric signal into a corresponding first ultrasonic signal and injecting the first ultrasonic signal into the thin-wall concrete to be tested from one side of each selected test position of the thin-wall concrete to be tested.
3. The system of claim 2, wherein the first shear ultrasonic transducer comprises:
the first energy conversion unit is used for converting the first electric signal into a corresponding first ultrasonic signal;
and the first transverse wave ultrasonic transducer probe is used for injecting the first ultrasonic signal into the thin-wall concrete to be tested from one side of each selected test position of the thin-wall concrete to be tested.
4. The ultrasonic transverse wave detection system for the stress state of the thin-walled concrete structure according to claim 3, wherein the receiving end comprises:
the second transverse wave ultrasonic transducer is used for receiving a second ultrasonic signal emitted from the other side of each selected test position of the thin-wall concrete to be tested and converting the second ultrasonic signal into a corresponding second electric signal;
the signal oscilloscope is used for receiving and displaying the first electric signal and the second electric signal;
and the data storage processor is used for receiving and storing the first electric signal and the second electric signal, obtaining ultrasonic propagation travel time based on comparison of the first electric signal and the second electric signal, and calculating the structural stress of the thin-wall concrete to be measured based on the ultrasonic travel time.
5. The system of claim 4, wherein the second shear ultrasonic transducer comprises:
the second transverse wave ultrasonic transducer probe is used for receiving a second ultrasonic signal emitted from the other side of each selected test position of the thin-wall concrete to be tested;
and the second transduction unit is used for converting the second ultrasonic signal into a corresponding second electric signal.
6. The system for detecting the ultrasonic transverse wave of the thin-wall concrete structure in the stress state according to claim 5, wherein the first transverse wave ultrasonic transducer probe and the second transverse wave ultrasonic transducer probe are arranged on a slide rail tool in a transmission mode by probe pair, the first transverse wave ultrasonic transducer probe and the slide rail tool are fixedly arranged, and the second transverse wave ultrasonic transducer probe slides along a tool rail;
the distance from the first shear wave ultrasound transducer probe and the second shear wave ultrasound transducer probe is measured by the length scale.
7. The ultrasonic shear wave detection system for the stress state of the thin-walled concrete structure according to claim 6, wherein the data storage processor comprises:
step 1: determining wing plate positions meeting the beam end zero boundary stress condition, and arranging the combined ultrasonic transducers on two sides of the wing plate positions in a butt-measuring mode;
step 2: rotating the first and second shear wave ultrasound transducer probes synchronously based on the angle of rotationDetermining a first shear wave velocity at which the polarization directions of the sensors are perpendicular to each other when the current ultrasound of the first ultrasonic signal and the second ultrasonic signal propagates away
Figure FDA0003750299880000021
And second shear wave velocity
Figure FDA0003750299880000022
And step 3: based on the wave velocity of the first shear wave
Figure FDA0003750299880000023
And the second shear wave velocity
Figure FDA0003750299880000024
Calculating the first average wave velocity
Figure FDA0003750299880000025
Figure FDA0003750299880000031
In the formula (I), the compound is shown in the specification,
Figure FDA0003750299880000032
is the first average wave velocity;
and 4, step 4: determining a target structure stress test position, and arranging the combined ultrasonic transducers on two sides of the target structure stress test position in a butt-testing manner;
and 5: synchronously rotating the first transverse wave transducer probe and the second transverse wave ultrasonic transducer probe based on angle rotary teeth according to a preset interval degree until the polarization direction of a sensor on the second transverse wave ultrasonic transducer is parallel to the stress direction, and determining the maximum transverse wave velocity v based on the current ultrasonic propagation time of the first ultrasonic signal and the second ultrasonic signal z1 While recording on an angle scaleA first rotation angle;
step 6: determining a first rotation angle range based on the first rotation angle, starting from a lower limit value of the first rotation angle range according to a preset interval degree, synchronously rotating the first transverse wave transducer probe and the second transverse wave ultrasonic transducer probe based on the angle rotation teeth until a sensor polarization direction on the second transverse wave ultrasonic transducer is perpendicular to a stress direction, and determining a minimum transverse wave velocity v based on the current ultrasonic propagation time of the first ultrasonic signal and the second ultrasonic signal z2 ；
And 7: based on the maximum shear wave velocity v z1 And the minimum shear wave velocity v z2 Calculating a second average wave velocity v T ：
Figure FDA0003750299880000033
In the formula, v T A second average wave velocity;
and step 8: based on the first average wave velocity, the second average wave velocity and the maximum shear wave velocity v z1 And the minimum shear wave velocity v z2 And calculating the structural stress of the target structural stress test position:
Figure FDA0003750299880000034
Figure FDA0003750299880000035
in the formula, σ 1 And σ 1 For v under the plane strain state of the thin-wall concrete to be measured z1 And v z2 Stress in polarization direction, σ 1 And σ 1 In units of MPa, v T Is the second average wave velocity and is the second average wave velocity,
Figure FDA0003750299880000036
is the first average wave velocity, C T The transverse wave acoustic elastic coefficient of the material of the thin-wall concrete to be tested at the stress test position of the target structure, and C T Has a unit of (MPa) -1 ，v z1 Is the maximum shear wave velocity, v z2 At the minimum shear wave velocity, C A The material transverse wave acoustic elastic birefringence coefficient of the thin-wall concrete to be tested at the stress test position of the target structure, and C A Has a unit of (MPa) -1 。
8. The ultrasonic shear wave detection system for stress state of thin-walled concrete structure of claim 7, wherein the maximum shear wave velocity v is determined based on the current ultrasonic propagation time of the first ultrasonic signal and the second ultrasonic signal z1 The method comprises the following steps:
the frequency spectrum naming subunit is configured to output a first signal spectrogram of the first electrical signal and a second signal spectrogram of the second electrical signal when the angle rotation tooth is at the first rotation angle, use the first signal spectrogram as a reference spectrogram, and use the second signal spectrogram as a spectrogram to be corrected corresponding to the first reference spectrogram;
the signal denoising subunit is configured to denoise the signal spectrogram corresponding to the reference spectrogram to obtain a corresponding denoised spectrogram;
the fourth calculating subunit is configured to calculate a first peak average value and a first trough average value corresponding to the denoised spectrogram, and at the same time, calculate a second peak average value and a second trough average value corresponding to the spectrogram to be corrected;
a fifth calculating subunit, configured to calculate a first difference between the first peak average and the second peak average and a second difference between the first valley average and the second valley average, calculate a third difference between the first peak average and the first valley average, and calculate a longitudinal scaling multiple corresponding to the spectrogram to be corrected based on a first ratio between the first difference and the third difference and a second ratio between the second difference and the third difference;
the frequency determining subunit is configured to determine all zero-crossing points in the denoised spectrogram, obtain a corresponding first zero-crossing point sequence, determine a corresponding first vibration frequency based on the first zero-crossing point sequence, determine all zero-crossing points in the spectrogram to be corrected, obtain a corresponding second zero-crossing point sequence, and determine a corresponding second vibration frequency based on the second zero-crossing point sequence;
a sixth calculating subunit, configured to calculate a corresponding lateral scaling factor based on the first vibration frequency and the second vibration frequency;
the spectrum fitting subunit is used for fitting a corresponding fitted signal spectrogram based on the longitudinal scaling factor, the transverse scaling factor and the de-noised spectrogram;
the local corrector subunit is used for carrying out local correction on the spectrogram to be corrected based on the fitted signal spectrogram to obtain a corresponding corrected spectrogram;
the spectrum output subunit is configured to use the denoised spectrogram corresponding to the reference spectrogram as a corresponding first corrected spectrogram, and use the corrected spectrogram corresponding to the first to-be-corrected spectrogram as a corresponding second corrected spectrogram;
a speed determining subunit, configured to obtain a current ultrasonic propagation time based on the first correction frequency spectrum and the second correction frequency spectrum, and determine a maximum shear wave speed v based on the current ultrasonic propagation time z1 。
CN202210840661.XA 2022-07-18 2022-07-18 Thin wall concrete structure stress state ultrasonic transverse wave detecting system Pending CN115219597A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210840661.XA CN115219597A (en) 2022-07-18 2022-07-18 Thin wall concrete structure stress state ultrasonic transverse wave detecting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210840661.XA CN115219597A (en) 2022-07-18 2022-07-18 Thin wall concrete structure stress state ultrasonic transverse wave detecting system

Publications (1)

Publication Number Publication Date
CN115219597A true CN115219597A (en) 2022-10-21

Family

ID=83611077

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210840661.XA Pending CN115219597A (en) 2022-07-18 2022-07-18 Thin wall concrete structure stress state ultrasonic transverse wave detecting system

Country Status (1)

Country Link
CN (1) CN115219597A (en)

Similar Documents

Publication Publication Date Title
Alleyne et al. A two-dimensional Fourier transform method for the measurement of propagating multimode signals
Dai et al. Structure damage localization with ultrasonic guided waves based on a time–frequency method
CN106556647B (en) A kind of impact echo data processing method
CN109596252B (en) Steel member internal axial stress detection method based on transverse wave phase spectrum
Krause et al. Elastic wave modes for the assessment of structural timber: ultrasonic echo for building elements and guided waves for pole and pile structures
CN104142195A (en) Device and method for detecting interior initial stress of steel structural member based on ultrasonic method
CN106017372A (en) Ultrasonic non-destructive abrasion-resistant coating thickness and elastic modulus measuring method
CN102636303A (en) Method for measuring residual stress of thin plating layer based on surface ultrasonic waves
CN110346453B (en) Method for rapidly detecting reflection echoes of small defect arrays in concrete structure
CN106643939A (en) Method for calculating ultrasonic transmission time through ultrasonic flowmeter
CN111487315A (en) Audio frequency nondestructive testing method for tunnel lining thickness and void
CN114994175B (en) Space coupling ultrasonic stress detection device and method for modal decomposition double-spectrum analysis
CN111337171A (en) Acoustic time difference measuring method applied to critical refraction longitudinal wave stress detection
CN105203638A (en) Method for detecting distribution of steel member absolute stress along depth on basis of Lcr wave method
CN106198739A (en) A kind of TOFD near surface blind region defect location detection method based on shape transformation
CN105424810A (en) Evaluation method for uniformity of fiber reinforcement ceramic matrix composite
CN108872386B (en) Correction method for concrete strength ultrasonic angle measurement method detection
CN111157065A (en) Acoustic time delay measuring method in ultrasonic signal transmission loop of gas ultrasonic flowmeter
CN109490417B (en) Ultrasonic detection method for plane anisotropy of metal material
CN103075981A (en) Ultrasonic thickness measuring method
CN110243945A (en) Ultrasonic TOFD blind area suppressing method based on synthetic aperture focusing Yu mode converted wave
CN106680375B (en) For determining the Air Coupling supersonic detection method of the elasticity modulus of material
CN112484836B (en) Ultrasonic probe device and workpiece sound velocity measurement method
GB2091889A (en) Plastic anisotropy in sheet materials
CN111610253B (en) Ultrasonic creeping wave probe defect echo positioning 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