CN109521098A - A kind of monitoring system and method for sound barrier - Google Patents
A kind of monitoring system and method for sound barrier Download PDFInfo
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- CN109521098A CN109521098A CN201811346907.8A CN201811346907A CN109521098A CN 109521098 A CN109521098 A CN 109521098A CN 201811346907 A CN201811346907 A CN 201811346907A CN 109521098 A CN109521098 A CN 109521098A
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- 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
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- 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
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- 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
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- 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
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Abstract
The invention discloses a kind of monitoring systems for sound barrier, electric signal R-T unit including being set to the head of sound barrier fastener, it is connect with electric signal R-T unit, the processor for calculating the pretightning force of fastener to be measured to received transmission time from transmitting by electric signal to be monitored to sound barrier.Therefore, using this programme, the difference of the launch time of the pulse electrical signal of electric signal R-T unit transmitting and the receiving time of the received electric echo signal of electric signal R-T unit can be calculated using processor, determine the transmission time of mechanical wave signals, and the pretightning force of fastener is calculated according to the transmission time, to be detected according to the pretightning force to sound barrier, this monitoring system substitutes traditional manual type, manpower and material resources when detecting to fastener are saved, and improve the detection efficiency and detection effect to fastener.In addition, the invention also discloses a kind of detection method for sound barrier, effect is as above.
Description
Technical field
The present invention relates to field of track traffic, in particular to a kind of monitoring system and method for sound barrier.
Background technique
It is inserted into a facility between sound source and recipient, so that Acoustic Wave Propagation is had a significant additional attenuation, to subtract
Weak recipient influence of noise within a certain area, such facility be known as sound barrier.Traffic sound barrier mainly be in
The resident on highway or railway one side creates noiseless environment.
Sound barrier can generate strong influence when toppling to the operational safety of rail traffic, and the fastener of sound barrier
Pretightning force decline or noise barrier structure health status deterioration be the major reason for causing sound barrier to topple.That is fastener
Deflection corresponds to the pretightning force of fastener, and the offset of noise barrier structure resonant frequency corresponds to the healthy shape of noise barrier structure
Condition, thus for the structure of sound barrier fastener carry out detection seem most important, the fastener of sound barrier is examined at present
The mode of survey mainly by the way of manual inspection, is successively checked simultaneously by each fastener of the service personnel to sound barrier
Determine whether fastener loosens by the way of manual.In this way, can not only waste a large amount of manpower and material resources, but also for fastener
The detection efficiency detected is relatively low, and detection effect is also poor.
Therefore, how saving manpower and material resources when detecting to fastener and improving is to the detection efficiency of fastener
Those skilled in the art's problem to be solved.
Summary of the invention
The purpose of the present invention is to provide a kind of monitoring system and method for noise barrier structure, save to fastener
Manpower and material resources when being monitored and improve detection efficiency to fastener.
To achieve the above object, the embodiment of the invention provides following technical solutions:
The embodiment of the invention provides a kind of monitoring systems for sound barrier, comprising:
Emit pulse electrical signal for the head by fastener to be measured and receives the pulse electrical signal through described to be measured
The electric signal R-T unit of the electric echo signal of the tail portion reflection of fastener；
It is connect with the electric signal R-T unit, is set to the piezoelectric ceramic device on the head of the fastener to be measured, used
In the mechanical wave signals that the pulse electrical signal is converted to same frequency, by the mechanical wave signals from the fastener to be measured
Head is sent to the inside of the fastener to be measured, and the mechanical wave echo-signal that will be reflected through the tail portion of the fastener to be measured
It is converted to the electric echo signal and is sent to the electric signal R-T unit；
The processor being connect with the electric signal R-T unit, for emitting the arteries and veins by the electric signal R-T unit
Rush electric signal to the transmission time for receiving the electric echo signal calculate the pretightning force of the fastener to be measured with to it is described to
The structure for surveying the corresponding sound barrier of fastener is monitored.
Preferably, the electric signal R-T unit and the processor are integrated in shell；
The measuring instrument of the electric signal R-T unit, the processor and being integrally formed of shell.
Preferably, the electric signal R-T unit and the piezoelectric ceramic device are especially by cable connection.Preferably, also
It include: to be connect by 4G mobile communications network with the measuring instrument, for remotely being controlled and being received institute to the measuring instrument
State the monitor terminal of the monitoring information of measuring instrument.
Preferably, it is connected to the processor, the temperature that the pretightning force for calculating the processor is modified is mended
Repay device.
Preferably, the electric signal R-T unit includes: electrical signal emitter and electric signal receiver.
Secondly, the embodiment of the invention provides a kind of detection methods for sound barrier, comprising:
It obtains transmitting pulse electrical signal and receives the time difference of electric echo signal to obtain mechanical wave signals in fastening to be measured
Intracorporal transmission time；
It is supervised according to the pretightning force that the transmission time calculates the fastener to be measured with the structure to the sound barrier
It surveys.
Preferably, the time difference for obtaining transmitting pulse electrical signal and receiving electric echo signal is to obtain mechanical wave signals
Include: in the intracorporal transmission time of fastening to be measured
It determines transmitting pulse electrical signal and receives the time interval between electric echo signal.
Using the half of the time interval as the transmission time.
Preferably, described that the pretightning force of the fastener to be measured is calculated to the sound barrier according to the transmission time
Structure, which is monitored, includes:
Measurement demarcates the mechanical wave signals and fastens the intracorporal standard transmission time in the free state standard of no pretightning force；
When calculating the transmission time Yu the standard transmission of mechanical wave signals when the fastener to be measured is in Pre strained state
Between time difference；
Determine the mechanical wave signals in the intracorporal spread speed characteristic quantity of fastening to be measured；
The deflection of the fastener to be measured is calculated according to the time difference and the spread speed characteristic quantity；
The pretightning force is calculated using the spread speed characteristic quantity of the deflection and the fastener to be measured.
Preferably, further includes:
Obtain the vibration time-domain signal of noise barrier structure around the junction of the fastener to be measured；
The vibration time-domain signal is converted into frequency-region signal line frequency spectrum analysis of going forward side by side to be total to the determination noise barrier structure
The offset of vibration frequency is monitored the structure of the sound barrier.
As it can be seen that a kind of monitoring system for noise barrier structure disclosed by the embodiments of the present invention, it can be using processor to electricity
The launch time of the pulse electrical signal of signal receiving/transmission device transmitting and the reception of the received electric echo signal of electric signal R-T unit
Time determines that mechanical wave signals in the intracorporal transmission time of fastening to be measured, and are calculated according to the transmission time by processor to be measured
For the pretightning force of fastener to be monitored according to structure of the pretightning force to sound barrier, this monitoring system substitutes traditional artificial side
Formula saves manpower and material resources when being monitored to fastener to be measured, and improves the monitoring efficiency and prison to fastener to be measured
Survey effect.In addition, the embodiment of the invention also discloses a kind of detection method for noise barrier structure, effect is as above.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of monitoring system structure diagram for sound barrier disclosed by the embodiments of the present invention；
Fig. 2 is a kind of detection method flow diagram for sound barrier disclosed by the embodiments of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a kind of monitoring system and method for noise barrier structure, save to fastener into
Manpower and material resources when row monitoring and improve monitoring efficiency and monitoring effect to fastener.
Referring to Figure 1, Fig. 1 is a kind of monitoring system structure diagram for sound barrier disclosed by the embodiments of the present invention,
The monitoring system includes: to emit pulse electrical signal for the head by fastener 10 to be measured and receive pulse electrical signal through to be measured
The electric signal R-T unit 1 of the electric echo signal of the tail portion reflection of fastener 10, connect with electric signal R-T unit 1, is set to
The piezoelectric ceramic device 3 on 10 head of fastener to be measured, for pulse electrical signal to be converted to mechanical wave signals, and mechanical wave is believed
It number is sent to the inside of fastener 10 to be measured from the head of fastener 10 to be measured, and will be reflected through the tail portion of fastener 10 to be measured
Mechanical echoes signal is converted to electric echo signal and is sent to electric signal R-T unit 1；The processing being connect with electric signal R-T unit 1
Device 2 is to be measured tight to the transmission time calculating for receiving electric echo signal for emitting pulse electrical signal by electric signal R-T unit 1
The pretightning force of solid 10 is detected with the structure to the corresponding sound barrier of fastener 10 to be measured.
Specifically, electric signal R-T unit 1 can be set in the head of fastener 10 to be measured, according to reality in the present embodiment
Border situation, electric signal R-T unit 1 also can be set in the tail portion of fastener 10 to be measured.Electric signal R-T unit 1 specifically includes
Electrical signal emitter and electric signal receiver, electrical signal emitter can be pulse electrical signal generating device, electric signal receiver
It can be the device (may refer to the prior art) of reception electric signal.
Microcomputer, such as single-chip microcontroller, control circuit can be used for processor 2.Processor 2 can use existing
Processor in technology, the pretightning force for calculating fastener 10 to be measured according to the transmission time of mechanical wave signals in processor 2 are specific
Process is as follows:
In a free state (standard fastener), pretightning force is not present inside bolt in fastener 10 to be measured, and fastener 10
Under tightening state (fastener to be measured), due to the effect of pretightning force, to be measured fastener 10 will deformation occurs, therefore, because
The effect of pretightning force, to be measured fastener 10 will deformation occurs, and the deflection of fastener 10 to be measured is denoted as Δ L at this time, then according to
According to the relationship between deflection Δ L and pretightning force F, the pretightning force of fastener 10 to be measured is obtained, pretightning force calculation formula is as follows:
In above formula, E is the elasticity modulus of the material of fastener 10 to be measured, and S is the cross-sectional area of fastener 10 to be measured, Δ L
For the deflection of fastener 10 to be measured, L is the clamping length of 10 auxiliary connection of fastener to be measured.It is stored in advance and needs in processor 2
The length for surveying the elasticity modulus of fastener 10, the cross-sectional area of fastener to be measured 10 and fastener to be measured 10 (corresponds to standard
The spiro rod length of fastener) as follows with the calculation method of the Δ L in above formula:
For standard fastener 10 (fastener i.e. under free state), the transmitting of electric signal R-T unit 1 and reception
The transmission time of electric signal is T0, the mechanical wave signals of fastener 10 to be measured are between the head and tail portion of fastener 10 to be measured
Transmission time is T1, according to transmission time T0With transmission time T1Calculate the change between the time difference and fastener to be measured 10 of the two
Shape amount.Corresponding to the installation site for the electric signal R-T unit 1 mentioned in above-described embodiment, the deflection of fastener 10 to be measured
Calculation formula is as follows:
Wherein, what v was indicated is mechanical wave signals in the intracorporal spread speed of fastening to be measured.
To sum up, the pretightning force of fastener 10 to be measured is solved in conjunction with (1) and (2) formula.
It should be noted that fastener 10 to be measured is whether disposed vertically, slant setting will not shadow or horizontal positioned
The implementation of the embodiment of the present invention is rung, as long as guaranteeing to measure the pretightning force of fastener 10 to be measured.
In the present embodiment, the course of work between piezoelectric ceramic device 3 and processor 2 is as follows:
The mechanical wave that piezoelectric ceramic device 3 acquires fastener auxiliary connection structure periphery sound barrier vibrates time-domain signal, and will
Mechanical wave signals are changed into electric signal, at this point, processor 2 detects the electric signal.
After obtaining the electric signal, which is converted to frequency-region signal by processor 2, in 10 auxiliary connection of fastener to be measured
And around it when the resonance of sound barrier recurring structure, resonant frequency can shift as noise barrier structure health status deteriorates.
It should be noted that compact and portability in order to guarantee entire measuring instrument, it can be by electric signal R-T unit 1
It is integrated in the same tooling with processor 2, which uniformly connects the piezoceramics layer of connecting line to piezoelectric ceramic device 3
Electrode layer.Therefore, shell, electric signal transmitting-receiving are integrated in as preferred embodiment, electric signal R-T unit 1 and processor 2
Device 1, processor 2 and shell being integrally formed measuring instrument.Measuring instrument can there are two types of operating mode, the first Working moulds simultaneously
Formula is to calculate the pretightning force of fastener 10 to be measured by processor 2 by electric signal R-T unit 1 and 2 collective effect of processor.The
Two kinds of operating modes are that the mechanical wave that piezoelectric ceramic device 3 acquires sound barrier around fastening body structure vibrates time-domain signal, and will
Mechanical wave signals are changed into electric signal.Processor 2 carries out spectrum analysis to the signal, to determine noise barrier structure around fastener
The offset of resonant frequency.A possibility that sound barrier topples is determined to the offset of low frequency according to resonant frequency, if resonance frequency
Rate reaches preset value to the degrees of offset of low-frequency range, then it is assumed that variation (malfunction) has occurred in the structure of sound barrier.
Further, in order to guarantee instantaneity that signal between electric signal R-T unit 1 and piezoelectric ceramic device 3 transmits, make
For preferred embodiment, electric signal R-T unit 1 and piezoelectric ceramic device 3 are especially by cable connection.
As it can be seen that a kind of monitoring system for noise barrier structure disclosed by the embodiments of the present invention, can be calculated using processor
The launch time of pulse electrical signal of electric signal R-T unit transmitting and connecing for the received electric echo signal of electric signal R-T unit
Difference between time receiving determines that mechanical wave signals fasten intracorporal transmission time to be measured, and by processor according to the transmission time meter
The pretightning force of fastener to be measured is calculated to be monitored according to structure of the pretightning force to sound barrier, this monitoring system substitution is traditional
Manual type, save manpower and material resources when being monitored to fastener to be measured, and improve the monitoring to fastener to be measured
Efficiency and monitoring effect.
In order to which the monitoring result to measuring instrument carries out real-time monitoring and to the parameter of the fastener to be measured 10 in measuring instrument
It is effectively configured, above embodiments is based on, as preferred embodiment, further includes: pass through 4G mobile network and measuring instrument
Connection, the monitor terminal of the monitoring information for measuring instrument remotely being controlled and being received measuring instrument.
Specifically, in the present embodiment, monitor terminal can be mobile phone, plate, apparatus such as computer, can be with using monitor terminal
Be arranged electric signal R-T unit 1 emit pulse electrical signal frequency 10 material of fastener to be measured different with setting elasticity modulus,
Temperature compensation parameter, according to the actual situation, monitor terminal can also realize other application function, and the embodiment of the present invention is herein not
It limits.
In order to carry out on-line amending to the calculated pretightning force of processor 2, based on the above embodiment, implement as preferred
Example, further includes: connect with processor 2, the temperature compensation means that the pretightning force for calculating processor 2 is modified.
A kind of detection method for sound barrier disclosed by the embodiments of the present invention is introduced below, is based on any of the above
The monitoring system for sound barrier that one embodiment is mentioned, refers to Fig. 2, and Fig. 2 is a kind of use disclosed by the embodiments of the present invention
In the detection method flow diagram of sound barrier, this method comprises:
S201, it obtains transmitting pulse electrical signal and receives the time difference of electric echo signal to obtain mechanical wave signals to be measured
Fasten intracorporal transmission time.
S202, it the pretightning force of fastener to be measured is calculated according to transmission time is monitored with the structure to sound barrier.
It should be noted that a kind of detection method for noise barrier structure provided in an embodiment of the present invention and above-mentioned any
The monitoring system for noise barrier structure that one embodiment is mentioned is corresponding, and for duplicate contents, the embodiment of the present invention is no longer
It is described in detail.
As it can be seen that a kind of detection method for noise barrier structure disclosed by the embodiments of the present invention, exists according to mechanical wave signals
The intracorporal transmission time of fastening to be measured, and the pretightning force of fastener to be measured is calculated according to the transmission time, thus pre- according to this
Clamp force detects sound barrier, this monitoring system substitutes traditional manual type, saves and detects to fastener to be measured
When manpower and material resources, and improve the detection efficiency and detection effect to fastener to be measured.
As preferred embodiment, step S201 includes:
It determines transmitting pulse electrical signal and receives the time interval between electric echo signal.
Using the half of the time interval as the transmission time.
Based on the above embodiment, as preferred embodiment, step S202 includes:
Measurement demarcates the mechanical wave signals and fastens the intracorporal standard transmission time in the free state standard of no pretightning force；
When calculating the transmission time Yu the standard transmission of mechanical wave signals when the fastener to be measured is in Pre strained state
Between time difference；
Determine the mechanical wave signals in the intracorporal spread speed characteristic quantity of fastening to be measured；
The deflection of the fastener to be measured is calculated according to the time difference and the spread speed characteristic quantity；
The pretightning force is calculated using the spread speed characteristic quantity of the deflection and the fastener to be measured.
Specifically, the spread speed characteristic quantity of the fastener to be measured in the present embodiment includes: Mechanical Longitudinal Waves in fastening to be measured
Intracorporal spread speed, the elasticity modulus of the material of fastener to be measured, the cross-sectional area of fastener to be measured, fastener connection to be measured
Secondary clamping length.The calculation method closed in this present embodiment may refer to the meter about pretightning force recorded in above-described embodiment
Formula is calculated, details are not described herein.
As preferred embodiment, further includes:
Obtain the vibration time-domain signal of the noise barrier structure around the fastener auxiliary connection to be measured；
The vibration time-domain signal is converted into frequency-region signal line frequency spectrum analysis of going forward side by side to be total to the determination noise barrier structure
The offset of vibration frequency is monitored the structure of the sound barrier.
A kind of monitoring system and method for noise barrier structure provided herein are described in detail above.
Specific examples are used herein to illustrate the principle and implementation manner of the present application, and the explanation of above embodiments is only used
The present processes and its core concept are understood in help.It should be pointed out that for those skilled in the art,
Under the premise of not departing from the application principle, can also to the application, some improvement and modification can also be carried out, these improvement and modification
It falls into the protection scope of the claim of this application.
Each embodiment is described in a progressive manner in specification, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part illustration
?.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
Claims (10)
1. a kind of monitoring system for noise barrier structure characterized by comprising
Emit pulse electrical signal for the head by fastener to be measured and receives the pulse electrical signal through the fastening to be measured
The electric signal R-T unit of the electric echo signal of the tail portion reflection of body；
It is connect with the electric signal R-T unit, is set to the piezoelectric ceramic device on the head of the fastener to be measured, being used for will
The pulse electrical signal is converted to the mechanical wave signals of same frequency, by the mechanical wave signals from the head of the fastener to be measured
It is sent to the inside of the fastener to be measured, and the mechanical wave echo-signal reflected through the tail portion of the fastener to be measured is converted
The electric signal R-T unit is sent to for the electric echo signal；
The processor being connect with the electric signal R-T unit, for emitting the pulse electricity by the electric signal R-T unit
Signal to the transmission time for receiving the electric echo signal calculate the pretightning force of the fastener to be measured with to it is described to be measured tight
The structure of the corresponding sound barrier of solid is monitored.
2. the monitoring system according to claim 1 for noise barrier structure, which is characterized in that
The electric signal R-T unit and the processor are integrated in shell；
The measuring instrument of the electric signal R-T unit, the processor and being integrally formed of shell.
3. the monitoring system according to claim 1 for noise barrier structure, which is characterized in that the electric signal transmitting-receiving dress
It sets with the piezoelectric ceramic device especially by cable connection.
4. the monitoring system according to claim 2 for noise barrier structure, which is characterized in that further include: it is moved by 4G
Dynamic communication network is connect with the measuring instrument, for the measuring instrument remotely being controlled and being received the monitoring of the measuring instrument
The monitor terminal of information.
5. the monitoring system according to claim 1 for noise barrier structure, which is characterized in that further include: with the place
Manage device connection, the temperature compensation means that the pretightning force for calculating the processor is modified.
6. the monitoring system of noise barrier structure is used for described in -5 any one according to claim 1, which is characterized in that the electricity
Signal receiving/transmission device includes: electrical signal emitter and electric signal receiver.
7. a kind of detection method for noise barrier structure is used for sound barrier knot based on as claimed in any one of claims 1 to 6
The monitoring system of structure characterized by comprising
It obtains transmitting pulse electrical signal and receives the time difference of electric echo signal to obtain mechanical wave signals in fastener to be measured
Transmission time；
It is monitored according to the pretightning force that the transmission time calculates the fastener to be measured with the structure to the sound barrier.
8. the monitoring method according to claim 7 for sound barrier, which is characterized in that the acquisition emits pulse telecommunications
Number and receive the time difference of electric echo signal and to obtain mechanical wave signals in the intracorporal transmission time of fastening to be measured include:
It determines transmitting pulse electrical signal and receives the time interval between electric echo signal.
Using the half of the time interval as the transmission time.
9. the monitoring method according to claim 7 for noise barrier structure, which is characterized in that described according to the transmission
The pretightning force that time calculates the fastener to be measured is monitored with the structure to the sound barrier includes:
Measurement demarcates the mechanical wave signals and fastens the intracorporal standard transmission time in the free state standard of no pretightning force；
Calculate the transmission time of mechanical wave signals and the standard transmission time when fastener to be measured is in Pre strained state
Time difference；
Determine the mechanical wave signals in the intracorporal spread speed characteristic quantity of fastening to be measured；
The deflection of the fastener to be measured is calculated according to the time difference and the spread speed characteristic quantity；
The pretightning force is calculated using the spread speed characteristic quantity of the deflection and the fastener to be measured.
10. being used for the detection method of noise barrier structure according to claim 7-9 any one, which is characterized in that also wrap
It includes:
Obtain the vibration time-domain signal of noise barrier structure around the fastener junction to be measured；
The vibration time-domain signal is converted into frequency-region signal and goes forward side by side line frequency spectrum analysis with the determination noise barrier structure resonance frequency
The offset of rate is monitored the structure of the sound barrier.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022099926A1 (en) * | 2020-11-13 | 2022-05-19 | 中铁上海工程局集团有限公司 | Fatigue test device for boot-shaped steel column foot for railway sound barrier, and fatigue test method therefor |
| CN115435943A (en) * | 2022-09-19 | 2022-12-06 | 中物院成都科学技术发展中心 | Intelligent fastener, intelligent fastener monitoring system and intelligent fastener monitoring method |
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| CN108387338A (en) * | 2018-02-07 | 2018-08-10 | 大连理工大学 | A kind of bolt pretightening real time high precision detection method and system based on piezoelectric supersonic chip |
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| WO2022099926A1 (en) * | 2020-11-13 | 2022-05-19 | 中铁上海工程局集团有限公司 | Fatigue test device for boot-shaped steel column foot for railway sound barrier, and fatigue test method therefor |
| CN115435943A (en) * | 2022-09-19 | 2022-12-06 | 中物院成都科学技术发展中心 | Intelligent fastener, intelligent fastener monitoring system and intelligent fastener monitoring method |
| CN115435943B (en) * | 2022-09-19 | 2024-06-18 | 中物院成都科学技术发展中心 | Intelligent fastener, intelligent fastener monitoring system and intelligent fastener monitoring method |
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