CN106289694A - Electric power pylon screw retention performance estimating method and device - Google Patents
Electric power pylon screw retention performance estimating method and device Download PDFInfo
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- CN106289694A CN106289694A CN201610826298.0A CN201610826298A CN106289694A CN 106289694 A CN106289694 A CN 106289694A CN 201610826298 A CN201610826298 A CN 201610826298A CN 106289694 A CN106289694 A CN 106289694A
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- power pylon
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention provides a kind of electric power pylon screw retention performance estimating method and device.Wherein, the method comprises the steps: calculation procedure, calculates initial pretightning force f of electric power pylon bolt according to the predetermined torque putting on electric power pylon bolt1；Read step, carries out vibration test under preset temperature, and, vibration test reads the residual pre-tightening forces f of electric power pylon bolt after terminating2；Determine step, calculate initial pretightning force f1With residual pre-tightening forces f2Ratio, and the ratio f that will be calculated2/f1Compare with locking coefficient preset value K, if f2/f1More than locking coefficient preset value K, it is determined that the anti-loosening property of electric power pylon bolt is qualified.The electric power pylon screw retention performance estimating method that the present invention provides can carry out the assessment of anti-loosening property, beneficially electric power pylon bolt application at low ambient temperatures at low temperatures to electric power pylon bolt.
Description
Technical field
The present invention relates to T & D Technology field, in particular to a kind of electric power pylon screw retention Performance Evaluation side
Method and device.
Background technology
Extra-high voltage technology is to build global energy the Internet, the basis realizing energy resources pool exploitation, configuring and utilize,
Because only that the extra-high voltage AC and DC electrical network that electric pressure is high, transmission capacity is big, fed distance is remote could realize global each continent
Between, in continent between Energy Base and load center energy conveying.
At present, China is carrying out UHV Transmission Engineering construction.Compared with mid low latitude region, part UHV transmission
Engineering is in high latitude area, builds project of transmitting and converting electricity in this area, it is necessary first to consider reply is exactly the pole such as low temperature, high wind
End environmental load.Low temperature and high wind can cause electric power pylon bolt to get loose, rupture, and this also causes electric power pylon to vibrate disaster
Common cause.The research of rule that strong wind, big temperature difference region electric power pylon bolt are got loose, strong wind, big temperature difference region transmission of electricity ferrum
Tower bolt gets loose the time and the design parameters such as form and electric power pylon bolt pretightening, temperature, amplitude, frequency and the environment ginseng of getting loose
Number is relevant, but the mechanism that gets loose of strong wind, big temperature difference region electric power pylon bolt not yet illustrates, and the most just cannot transmit electricity under low temperature
Steel tower bolt carries out anti-loosening property assessment, and then the construction that tightens of electric power pylon bolt cannot be instructed to formulate with locking measure, no
It is beneficial to the application at low ambient temperatures of electric power pylon bolt.
Summary of the invention
In consideration of it, the present invention proposes a kind of electric power pylon screw retention performance estimating method and device, it is intended to solve mesh
Before the problem that electric power pylon screw retention performance under low temperature cannot be estimated.
One aspect, the present invention proposes a kind of electric power pylon screw retention performance estimating method, and the method includes as follows
Step: calculation procedure, calculates initial pretightning force f of electric power pylon bolt according to the predetermined torque putting on electric power pylon bolt1；
Read step, carries out vibration test under preset temperature, and, vibration test reads the remaining pre-of electric power pylon bolt after terminating
Clamp force f2；Determine step, calculate initial pretightning force f1With residual pre-tightening forces f2Ratio, and the ratio f that will be calculated2/f1With anti-
Pine coefficient preset value K compares, if f2/f1More than locking coefficient preset value K, it is determined that the locking property of electric power pylon bolt
Can be qualified.
Further, in above-mentioned electric power pylon screw retention performance estimating method, calculation procedure farther includes: according in advance
Clamp force and reduction formula M=kf of moment of torsion1D calculates initial pretightning force f1；Wherein, M is the default torsion putting on electric power pylon bolt
Square, D is the nominal diameter of electric power pylon bolt, and k is screwing force coefficient.
Further, in above-mentioned electric power pylon screw retention performance estimating method, in read step: preset temperature is 10 DEG C
～-70 DEG C.
Further, in above-mentioned electric power pylon screw retention performance estimating method, determine step may further comprise: if
f2/f1Less than or equal to locking coefficient preset value K, it is determined that the anti-loosening property of electric power pylon bolt is defective.
Further, in above-mentioned electric power pylon screw retention performance estimating method, determine in step: locking coefficient preset value
K is 0.2～0.5.
In the present invention, by calculating initial pretightning force f1With residual pre-tightening forces f2Ratio, and the ratio f that will be calculated2/
f1Compare with locking coefficient preset value K, if f2/f1More than locking coefficient preset value K, it is determined that electric power pylon bolt
Anti-loosening property is qualified.This appraisal procedure can be carried out at low temperatures, and electric power pylon bolt carries out the locking property of low temperature accurate, direct
Can assess, method is simple, quick, can be that design and the accident analysis of low temp area electric power pylon provides theoretical foundation and technology
Support, it is adaptable to the production and application of low temp area electric power pylon bolt, be of great practical significance.
On the other hand, the invention allows for a kind of electric power pylon screw retention capability evaluating device, this device includes: meter
Calculate module, for calculating initial pretightning force f of electric power pylon bolt according to the predetermined torque putting on electric power pylon bolt1；Read
Delivery block, for carrying out vibration test under preset temperature, and, vibration test reads the remnants of electric power pylon bolt after terminating
Pretightning force f2；Determine module, be used for calculating initial pretightning force f1With residual pre-tightening forces f2Ratio, and the ratio f that will be calculated2/
f1Compare with locking coefficient preset value K, if f2/f1More than locking coefficient preset value K, it is determined that electric power pylon bolt
Anti-loosening property is qualified.
Further, in above-mentioned electric power pylon screw retention capability evaluating device, computing module is additionally operable to according to pretightning force
Reduction formula M=kf with moment of torsion1D, calculates initial pretightning force f1, wherein, M is the predetermined torque putting on electric power pylon bolt,
f1For initial pretightning force, D is the nominal diameter of electric power pylon bolt, and k is screwing force coefficient.
Further, in above-mentioned electric power pylon screw retention capability evaluating device, in read module: preset temperature is 10 DEG C
～-70 DEG C.
Further, in above-mentioned electric power pylon screw retention capability evaluating device, determine that module is additionally operable to f2/f1Value
Compared with standard value K of locking coefficient, if f2/f1Standard value K less than or equal to locking coefficient, it is determined that electric power pylon spiral shell
The anti-loosening property of bolt is defective.
Further, in above-mentioned electric power pylon screw retention capability evaluating device, determine in module: locking factor standard value
K is 0.2～0.5.
In the present invention, by the ratio f that will be calculated2/f1Compare with locking coefficient preset value K, if f2/f1Greatly
In locking coefficient preset value K, it is determined that the anti-loosening property of electric power pylon bolt is qualified.This device can be at low temperature to electric power pylon spiral shell
Low temperature anti-loosening property accurate, direct assessment that bolt is carried out, can be that design and the accident analysis of low temp area electric power pylon provides
Theoretical foundation and technical support, it is adaptable to the production and application of low temp area electric power pylon bolt, have great production practices meaning
Justice.
Accompanying drawing explanation
By reading the detailed description of hereafter preferred implementation, various other advantage and benefit common for this area
Technical staff will be clear from understanding.Accompanying drawing is only used for illustrating the purpose of preferred implementation, and is not considered as the present invention
Restriction.And in whole accompanying drawing, it is denoted by the same reference numerals identical parts.In the accompanying drawings:
The flow chart of the electric power pylon screw retention performance estimating method that Fig. 1 provides for the embodiment of the present invention；
The vibration testing device that the electric power pylon screw retention performance estimating method that Fig. 2 provides for the embodiment of the present invention is suitable for
Structural representation；
The structured flowchart of the electric power pylon screw retention performance estimating method that Fig. 3 provides for the embodiment of the present invention.
Detailed description of the invention
It is more fully described the exemplary embodiment of the disclosure below with reference to accompanying drawings.Although accompanying drawing shows the disclosure
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure and should be by embodiments set forth here
Limited.On the contrary, it is provided that these embodiments are able to be best understood from the disclosure, and can be by the scope of the present disclosure
Complete conveys to those skilled in the art.It should be noted that in the case of not conflicting, embodiment in the present invention and
Feature in embodiment can be mutually combined.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Embodiment of the method:
See the flow chart of the electric power pylon screw retention performance estimating method that Fig. 1, Fig. 1 provide for the embodiment of the present invention.
As it can be seen, the method comprises the steps:
Calculation procedure S1, calculates the initial pretension of electric power pylon bolt according to the predetermined torque putting on electric power pylon bolt
Power f1。
Specifically, electric power pylon bolt is installed on the vibration testing device of arbitrary structures, uses torque spanner to transmission of electricity
Steel tower bolt applies predetermined torque, and calculates initial pretightning force f of electric power pylon bolt according to this predetermined torque1.This is preset and turns round
Square can determine according to practical situation, and in the present embodiment, the span of predetermined torque is 100N m～250N m.
Wherein, initial pretightning force f of electric power pylon bolt1It it is reduction formula M=kf according to pretightning force and moment of torsion1D counts
Calculate.M in formula is the moment of torsion putting on electric power pylon bolt, and D is the nominal diameter of electric power pylon bolt, and k is screwing force
Coefficient.Specifically, the nominal diameter D of electric power pylon bolt can be obtained by measurement, and screwing force coefficient k can be by relevant design
Standard scale is found.
Read step S2, carries out vibration test under preset temperature, and, vibration test reads electric power pylon spiral shell after terminating
The residual pre-tightening forces f of bolt2。
Specifically, preset temperature can according to electric power pylon bolt use environments to determine, and, preset temperature need
It is set before vibration testing device carries out vibration test, treats that the ambient temperature residing for electric power pylon bolt reaches preset temperature
After carry out vibration test again.In the present embodiment, this preset temperature is in the range of 10 DEG C～-70 DEG C.
When carrying out vibration test, the frequency of vibration of the motor in vibration testing device is in the range of 1HZ～10HZ, defeated
The vibration amplitude of ferroelectric tower bolt is in the range of 0.1mm～0.3mm, and the vibration test time was in the range of 3～8 minutes.Such as, shake
The frequency of vibration of the motor in dynamic test device can be adjusted to 2HZ, and the vibration amplitude of electric power pylon bolt can be adjusted to
0.19mm, the vibration test time can be adjusted to 4.5 minutes.
During test, the frequency of vibration of the motor in regulation vibration testing device is 2HZ, and makes shaking of electric power pylon bolt
Dynamic amplitude is 0.19mm.Refrigerating plant in vibration testing device is set preset temperature, starts this refrigerating plant, make transmission of electricity ferrum
Tower bolt local environment reaches preset temperature.At this moment, electric power pylon bolt is carried out under preset temperature the vibration examination of 4.5 minutes
Test, after electric power pylon bolt reaches the vibration test time, close vibration testing device, and fill with the test in vibration testing device
Put the residual pre-tightening forces f reading electric power pylon bolt2。
Determine step S3, calculate initial pretightning force f1With residual pre-tightening forces f2Ratio, and the ratio f that will be calculated2/f1
Compare with locking coefficient preset value K, if f2/f1More than locking coefficient preset value K, it is determined that preventing of electric power pylon bolt
Pine performance is qualified.If f2/f1Less than or equal to locking coefficient preset value K, it is determined that the anti-loosening property of electric power pylon bolt does not conforms to
Lattice.
Wherein, locking coefficient preset value K is 0.2～0.5.Specifically, locking coefficient preset value K is defeated after representing vibration test
Initial pretightning force f of ferroelectric tower bolt1Residual value.Preferably, locking coefficient preset value K is 0.4.
It can be seen that in the present embodiment, calculate electric power pylon bolt according to the predetermined torque that electric power pylon bolt is applied
Initial pretightning force f1, then under preset temperature, electric power pylon bolt is carried out vibration test, and reads electric power pylon bolt
Residual pre-tightening forces f2, finally by initial pretightning force f1With residual pre-tightening forces f2Ratio compare with locking coefficient preset value K
Relatively, it is judged that the locking property of electric power pylon bolt is the most qualified, and this appraisal procedure can be carried out under arbitrary preset temperature, when presetting
When temperature is low temperature, this appraisal procedure can carry out the assessment of anti-loosening property, this assessment side to the electric power pylon bolt under low temperature
Method is simple, accurate, can be that design and the accident analysis of low temp area electric power pylon provides theoretical foundation and technical support, favorably
In the production and application of low temp area electric power pylon bolt, solve and electric power pylon screw retention performance under low temperature cannot be entered at present
The problem of row assessment.
The electric power pylon screw retention performance estimating method that the present embodiment provides is applicable to the vibration test dress of any structure
Put, below by as a example by the vibration testing device shown in Fig. 2, summary electric power pylon bolt preset temperature range be 10 DEG C～-
Electric power pylon screw retention performance estimating method when 70 DEG C.
This vibration testing device can include motor (not shown), eccentric 1, drive link 2, connecting rod 3, first
Test device 4, driver plate 5, erecting bed 6, attemperator 8 and the second test device 9.
Wherein, the output shaft of motor is connected with eccentric 1, and, the center of eccentric 1 is not in the output of motor
On axle, eccentric 1 is used for producing vibration.First end (left end shown in Fig. 2) of drive link 2 can be connected with eccentric 1, passes
Second end (right-hand member shown in Fig. 2) of lever 2 is connected with the first test device 4 by connecting rod 3, the first end of driver plate 5
(left end shown in Fig. 2) is connected with the first test device 4, the side that the first test device 4 vibrates for detecting eccentric 1 to produce
To.Second end (right-hand member shown in Fig. 2) of driver plate 5 can be connected with erecting bed 6, and erecting bed 6 is arranged at attemperator 8
In, and, it being additionally provided with refrigerating plant (not shown) in attemperator 8, refrigerating plant is used for guaranteeing electric power pylon bolt 7
The temperature of experimental enviroment.Second test device 9 is placed in outside attemperator 8 and is connected with electric power pylon bolt 7, the second test
Device 9 is for testing the residual pre-tightening forces of electric power pylon bolt 7.
During test, electric power pylon bolt 7 is placed in vibration testing device erecting bed 6, by torque spanner to electric power pylon
Bolt 7 applies predetermined torque so that electric power pylon bolt 7 is securely fixed on erecting bed 6, according to formula M=kf1D can lead to
Cross predetermined torque and calculate initial pretightning force f of electric power pylon bolt 71.The motor of regulation vibration testing device, makes motor
Frequency of vibration is 2HZ, and to make the vibration amplitude of electric power pylon bolt 7 be 0.19mm.First refrigerating plant is set preset temperature, so
Rear startup refrigerating plant, makes electric power pylon bolt 7 local environment reach preset temperature, restarts motor, make eccentric 1 produce
Vibration, this vibration passes sequentially through drive link 2, connecting rod 3, first tests device 4, vibration is passed to by driver plate 5, erecting bed 6
Electric power pylon bolt 7, makes the vibration test that electric power pylon bolt 7 is carried out 4.5 minutes under preset temperature.Electric power pylon bolt 7
After reaching the vibration test time, closing this vibration testing device, the second test device 9 reads the remaining pre-of electric power pylon bolt 7
Clamp force f2。
Calculate initial pretightning force f1With residual pre-tightening forces f2Ratio, and the ratio f that will be calculated2/f1Pre-with locking coefficient
If value K compares, if f2/f1More than locking coefficient preset value K, it is determined that the anti-loosening property of electric power pylon bolt is qualified.As
Really f2/f1Less than or equal to locking coefficient preset value K, it is determined that the anti-loosening property of electric power pylon bolt is defective.
In sum, the appraisal procedure that the present embodiment provides can be carried out at low temperatures, electric power pylon bolt is carried out accurately,
Directly low temperature anti-loosening property assessment, method is simple, quick, can be that design and the accident analysis of low temp area electric power pylon carries
For theoretical foundation and technical support, it is adaptable to the production and application of low temp area electric power pylon bolt, there are great production practices
Meaning.
Device embodiment:
See the structural frames of the electric power pylon screw retention performance estimating method that Fig. 3, Fig. 3 provide for the embodiment of the present invention
Figure.As described in Figure, this device includes: computing module 100, read module 200 and determine module 300.Computing module 100 is for root
Initial pretightning force f of electric power pylon bolt is calculated according to the predetermined torque putting on electric power pylon bolt1.Read module 200 is used for
Vibration test is carried out under preset temperature, and, vibration test reads the residual pre-tightening forces f of electric power pylon bolt after terminating2.Really
Cover half block 300 is used for calculating initial pretightning force f1With residual pre-tightening forces f2Ratio, and the ratio f that will be calculated2/f1With locking
Coefficient preset value K compares, if f2/f1More than locking coefficient preset value K, it is determined that the anti-loosening property of electric power pylon bolt
Qualified.Wherein, the specific implementation process of this device sees the explanation in said method embodiment, and the present embodiment is at this no longer
Repeat.
It can be seen that in the present embodiment, this device can carry out low temperature accurate, direct at low temperatures to electric power pylon bolt
Anti-loosening property is assessed, and can be that design and the accident analysis of low temp area electric power pylon provides theoretical foundation and technical support, suitable
For the production and application of low temp area electric power pylon bolt, it is of great practical significance.
In above-described embodiment, computing module 100 is additionally operable to: according to pretightning force and reduction formula M=kf of moment of torsion1D calculates
Initial pretightning force f1；Wherein, M is the moment of torsion putting on electric power pylon bolt, and D is the nominal diameter of electric power pylon bolt, and k is stubborn
Clamp force coefficient.
It can be seen that in the present embodiment, by computing module 100 according to formula M=kf1D obtains electric power pylon bolt
Initial pretightning force, it is simple, convenient to calculate.
In above-described embodiment, in read step S2: preset temperature is 10 DEG C～-70 DEG C.
It can be seen that in the present embodiment, by the read module 200 ambient temperature to the vibration test of electric power pylon bolt
It is set, it is possible to achieve this appraisal procedure is carried out at low temperatures, and electric power pylon bolt is carried out low temperature anti-loosening property assessment,
Be conducive to the application at low ambient temperatures of electric power pylon bolt.
In above-described embodiment, determine that module 300 is additionally operable to: if f2/f1Less than or equal to locking coefficient preset value K, it is determined that
The anti-loosening property of electric power pylon bolt is defective.
It can be seen that in the present embodiment, be determined by module 300 by ratio f2/f1Compare with locking coefficient preset value K
Relatively, if f2/f1Less than or equal to locking coefficient preset value K, it is determined that the anti-loosening property of electric power pylon bolt is defective.This transmission of electricity
Steel tower screw retention performance estimating method is accurate, direct, beneficially electric power pylon bolt application at low ambient temperatures.
In above-described embodiment, determine in module 300: locking coefficient preset value K is 0.2～0.5.
It can be seen that in the present embodiment, be determined by the ratio f that module 300 will calculate2/f1With locking coefficient preset value K
Comparing, and then determine that electric power pylon screw retention performance is the most qualified, method is simple, quick, beneficially electric power pylon spiral shell
Bolt application at low ambient temperatures.
In sum, electric power pylon bolt can be carried out accurate, the lowest by the present embodiment provides device at low temperatures
Temperature anti-loosening property assessment, can be that design and the accident analysis of low temp area electric power pylon provides theoretical foundation and technical support,
It is applicable to the production and application of low temp area electric power pylon bolt, is of great practical significance.
Obviously, those skilled in the art can carry out various change and the modification essence without deviating from the present invention to the present invention
God and scope.So, if these amendments of the present invention and modification belong to the scope of the claims in the present invention and equivalent technologies thereof
Within, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. an electric power pylon screw retention performance estimating method, it is characterised in that comprise the steps:
Calculation procedure, calculates the initial pre-of described electric power pylon bolt according to the predetermined torque putting on described electric power pylon bolt
Clamp force f1；
Read step, carries out vibration test under preset temperature, and, described vibration test reads described electric power pylon after terminating
The residual pre-tightening forces f of bolt2；
Determine step, calculate described initial pretightning force f1With described residual pre-tightening forces f2Ratio, and the ratio f that will be calculated2/f1
Compare with locking coefficient preset value K, if f2/f1More than described locking coefficient preset value K, it is determined that described electric power pylon
The anti-loosening property of bolt is qualified.
Electric power pylon screw retention performance estimating method the most according to claim 1, it is characterised in that described calculation procedure
Farther include:
According to pretightning force and reduction formula M=kf of moment of torsion1D calculates described initial pretightning force f1；Wherein, M is described defeated for putting on
The predetermined torque of ferroelectric tower bolt, D is the nominal diameter of electric power pylon bolt, and k is screwing force coefficient.
Electric power pylon screw retention performance estimating method the most according to claim 1, it is characterised in that described read step
In: described preset temperature is 10 DEG C～-70 DEG C.
Electric power pylon screw retention performance estimating method the most according to claim 1, it is characterised in that described determine step
May further comprise:
If f2/f1Less than or equal to described locking coefficient preset value K, it is determined that the anti-loosening property of described electric power pylon bolt does not conforms to
Lattice.
Electric power pylon screw retention performance estimating method the most according to claim 1, it is characterised in that described determine step
In: described locking coefficient preset value K is 0.2～0.5.
6. an electric power pylon screw retention capability evaluating device, it is characterised in that including:
Computing module, for calculating at the beginning of described electric power pylon bolt according to the predetermined torque putting on described electric power pylon bolt
Beginning pretightning force f1；
Read module, for carrying out vibration test under preset temperature, and, described vibration test reads described transmission of electricity after terminating
The residual pre-tightening forces f of steel tower bolt2；
Determine module, be used for calculating described initial pretightning force f1With described residual pre-tightening forces f2Ratio, and the ratio that will be calculated
f2/f1Compare with locking coefficient preset value K, if f2/f1More than described locking coefficient preset value K, it is determined that described transmission of electricity
The anti-loosening property of steel tower bolt is qualified.
Electric power pylon screw retention capability evaluating device the most according to claim 6, it is characterised in that described computing module
It is additionally operable to:
According to pretightning force and reduction formula M=kf of moment of torsion1D, calculates described initial pretightning force f1, wherein, M is described for putting on
The predetermined torque of electric power pylon bolt, f1For described initial pretightning force, D is the nominal diameter of described electric power pylon bolt, and k is stubborn
Clamp force coefficient.
Electric power pylon screw retention capability evaluating device the most according to claim 6, it is characterised in that described read module
In:
Described preset temperature is 10 DEG C～-70 DEG C.
Electric power pylon screw retention capability evaluating device the most according to claim 6, it is characterised in that described determine module
It is additionally operable to:
By f2/f1Value compared with standard value K of locking coefficient, if f2/f1Standard value less than or equal to described locking coefficient
K, it is determined that the anti-loosening property of described electric power pylon bolt is defective.
Electric power pylon screw retention capability evaluating device the most according to claim 6, it is characterised in that described determine mould
In block:
Described locking factor standard value K is 0.2～0.5.
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| CN201610826298.0A CN106289694A (en) | 2016-09-14 | 2016-09-14 | Electric power pylon screw retention performance estimating method and device |
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| CN201610826298.0A CN106289694A (en) | 2016-09-14 | 2016-09-14 | Electric power pylon screw retention performance estimating method and device |
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| CN107036777A (en) * | 2017-04-18 | 2017-08-11 | 浙江华电器材检测研究所 | Fastener high/low temperature oscillation crosswise testing machine |
| CN107976307A (en) * | 2017-11-15 | 2018-05-01 | 西安工程大学 | A kind of iron tower of power transmission line bolt looseness on-Line Monitor Device and monitoring method |
| CN112525520A (en) * | 2021-02-08 | 2021-03-19 | 国能大渡河流域水电开发有限公司 | Online monitoring method and system for bolt of top cover of unit |
| CN112733400A (en) * | 2020-12-29 | 2021-04-30 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Method and device for evaluating sealing performance of mechanical equipment in simple resonance motion |
| CN112733399A (en) * | 2020-12-29 | 2021-04-30 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Failure evaluation method and device for bolt in random vibration |
| CN113358313A (en) * | 2021-06-08 | 2021-09-07 | 国网河南省电力公司电力科学研究院 | Method for testing looseness of bolts of power transmission iron tower |
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