CN101236125B - Small amplitude rectilinear movement displacement measurement method and its displacement measuring device - Google Patents
Small amplitude rectilinear movement displacement measurement method and its displacement measuring device Download PDFInfo
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- CN101236125B CN101236125B CN2008100080176A CN200810008017A CN101236125B CN 101236125 B CN101236125 B CN 101236125B CN 2008100080176 A CN2008100080176 A CN 2008100080176A CN 200810008017 A CN200810008017 A CN 200810008017A CN 101236125 B CN101236125 B CN 101236125B
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Abstract
The invention relates to a displacement measuring method and a displacement measuring device for a small-breadth rectilinear motion. The method comprises the following steps of adopting a fixed rotary encoder; connecting the turning angle connector of the rotary encoder with the hanging supporting device of a drive coil; the displacement of the hanging supporting device caused by the displacement of the drive coil bringing about the reciprocal rotary motion of the turning angle connector; the rotary encoder detecting the angular change value inputted by the turning angle connector and outputting a digital signal; obtaining a corresponding displacement value. The device has the deformation member or the rotary member of the hanging supporting device of the drive coil connected with the turning angle connector of the rotary encoder, and the turning angle connector inputs the change of the hanging supporting device into the rotary encoder in the turning angle mode. The method and the device which make use of the hanging supporting device of the drive coil inherently fixed on a vibrating platform can obtain the corresponding displacement value through the motion signal outputted by the rotary encoder without any extra device assembled on the drive coil.
Description
Technical field
The invention belongs to the displacement measurement technical field of high-frequency linear reciprocating motion by a small margin, be specifically related to a kind of displacement measurement method of the small amplitude rectilinear movement of mechanical environment experimental facilities-vibration table when operational vibration and displacement measuring device of this small amplitude rectilinear movement of being used for.
Background technology
Vibration table provides a kind of reciprocating equipment that carries out around equilibrium position or mean place etc., and the amplitude range of its linear reciprocating motion is very little, and maximum has only several centimetres.The mode that present its drive coil of employed measurement carries out the rectilinear motion displacement has two kinds, a kind of is directly to measure acquisition by Linear displacement transducer, for example adopts displacement measurement devices such as grating displacement sensor, linear resistance chi, eddy current displacement sensor, laser displacement sensor, ultrasonic displacement sensor.
As Fig. 1, the most frequently used displacement measuring device is by a taper structure reciprocal straight-line displacement to be converted to distance signal to measure at present, on drive coil 1, fixedly install a taper structure 3, correspondence is provided with an eddy current displacement sensor 4 on the magnetic cylinder seat 2 of vibration table, when the vibration of shift reciprocately takes place in drive coil 1, the chamfer distance that eddy current displacement sensor 4 can be measured taper structure 3 changes, thereby obtains the line correspondence displacement numerical value of drive coil.This metering system exists that cost is higher, the measurement result problem of unstable, and eddy current displacement sensor is easy to be subjected to the interference of external environment conditions such as temperature, electromagnetic field.And because the gap between drive coil and the magnetic cylinder seat is limited, the bevel angle of taper structure changes less, regulate very difficulty, simultaneously when drive coil in case because safeguard or repair dismantle after, must adjust the circuit of whole displacement measuring device again, use very inconvenience.Moreover taper structure is installed on the drive coil, can increase the quality of drive coil on the one hand, the artificial on the other hand dissymmetrical structure that causes drive coil, thereby the overall performance of influence and reduction vibration table.
Utilizing rotary encoder that rectilinear motion is converted to curve rotatablely moves, and to come Displacement Measurement according to the anglec of rotation of measuring be a kind of very proven technique, the precision height of its measuring equipment, detection method is fairly simple, generally rectilinear motion is converted to the device that rotatablely moves by on device to be measured, installing one additional, just can adopt rotary encoder to measure, rotary encoder and said method have been applied to the measurement of the straight-line displacement of multiple mechanical motion.But the shift reciprocately for the drive coil of shaking table is measured, do not allow on drive coil, to install additional or connect movement transforming device, this is because of the vibration output precision of drive coil as shaking table, optimal state is to approach zero own wt, and does not connect any center of vibration symmetry and dither assembly of influencing.If rotary encoder is directly connected on the drive coil by conversion equipment, can't obtain accurate measured value, on the other hand, this connects vibration output stability and the output usefulness that directly influences drive coil, the vibration test needs can not be satisfied, more accurate displacement measurement can not be obtained.
Summary of the invention
The object of the present invention is to provide a kind of intrinsic suspension strut mechanism of drive coil that utilizes, need not on drive coil, to install additional any device, can convert the reciprocal straight-line displacement of drive coil to digital signal result's small amplitude rectilinear movement is measured and exported to crankmotion displacement measurement method.This method when improving measurement stability, utilized drive coil intrinsic parts, can change the precision of measuring according to different requirements, cost is low, reliability is high, realizes digital control especially easily.
Another object of the present invention is to, a kind of intrinsic suspension strut mechanism of drive coil that utilizes is provided, need not the displacement measuring device that on drive coil any device just can carry out the small amplitude rectilinear movement that precise displacement measures to drive coil, this device simple in structure, reasonable in design, the unfailing performance height, and can require to change measuring accuracy according to difference.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of displacement measurement method of small amplitude rectilinear movement, the displacement measurement that is used for reciprocating drive coil, it is characterized in that described displacement measurement method comprises the rotary encoder that employing fixedly installs, the corner connector of rotary encoder is connected the suspension strut device that drive coil is set, the displacement of this suspension strut device that is caused by the drive coil displacement produces the crankmotion of corner connector, rotary encoder detects the angle changing value of corner connector input and exports digital signal, obtains corresponding shift value.
Concretely, described suspension strut device comprises an elastic supporting member for supporting optical member, and an end of elastic supporting member for supporting optical member fixedly installs, and the other end connects drive coil, and described corner connector connects the elastic supporting member for supporting optical member that the suspension strut device is set.
Described suspension strut device comprises one by pivotally connected revolving part, and the connection of the other end of revolving part is provided with drive coil, and the connection of corner connector is provided with this pivot or revolving part, by the revolving part or the pivot output anglec of rotation.
The suspension strut device of described drive coil is the rocking arm hitch, described rocking arm hitch comprises rubber torsion spring and rocking arm, the two ends of rubber torsion spring connect rocking arm respectively, two rocking arms are connected with fixed body with drive coil respectively, and the angle output point that is connected with the corner connector of rotary encoder is set on the rubber torsion spring.
The suspension strut device of described drive coil is for rolling arm sling on-hook structure, the described arm sling on-hook structure that rolls comprises a secter pat, the segment angle end of secter pat and fixed body articulate, be fixed with flexible sheets on the cambered surface of secter pat, the other end and the drive coil of flexible sheets are fixed, the segment angle end of described secter pat is connected with fixed body by a pivot, and described pivot is as the angle output point that is connected with the corner connector of rotary encoder.
The suspension strut device of described drive coil is the leaf spring hitch, and described leaf spring hitch comprises leaf spring, and the two ends of leaf spring are fixed with fixed body and drive coil respectively, and the angle output point that is connected with the corner connector of rotary encoder is set on the described leaf spring.
A kind of displacement measuring device of small amplitude rectilinear movement, the displacement measurement that is used for reciprocating drive coil, it is characterized in that described displacement measuring device comprises the suspension strut device of rotary encoder and drive coil, rotary encoder fixedly installs, the deformable member of the suspension strut device of drive coil or revolving part connect the corner connector that rotary encoder is set, and by the corner connector variation of suspension strut device are input to rotary encoder with the form of the anglec of rotation.
Concretely, the supported and suspended device of described drive coil is the rocking arm hitch, described rocking arm hitch comprises rubber torsion spring and rocking arm, the two ends of rubber torsion spring connect rocking arm respectively, two rocking arms are connected with fixed body with drive coil respectively, the angle output point that is connected with the corner connector of rotary encoder is set on the rubber torsion spring, and rotary encoder is fixedly installed on the magnetic cylinder seat, and the angle output point is arranged on the middle part of rubber torsion spring.
Described rotary encoder is fixedly installed on the magnetic cylinder seat, the supported and suspended device of described drive coil is for rolling arm sling on-hook structure, the described arm sling on-hook structure that rolls comprises a secter pat, the segment angle end of secter pat and fixed body articulate, be fixed with flexible sheets on the cambered surface of secter pat, the other end and the drive coil of flexible sheets are fixed, and the segment angle end of secter pat is connected with fixed body by a pivot, and described pivot is connected as the angle output point with the corner connector of rotary encoder.
The supported and suspended device of described drive coil is the leaf spring hitch, the leaf spring hitch comprises leaf spring, the two ends of leaf spring are fixed with fixed body and drive coil respectively, leaf spring is the plural pieces that horizontal parallel is provided with, the fixedly connected drive coil of one end of leaf spring, the other end of leaf spring is fixed on the bracing frame, and the middle part of a described leaf spring is as the angle output point, and the corner connector of rotary encoder is connected with this angle output point.
The displacement measurement method of this small amplitude rectilinear movement and displacement measuring device adopt rotary encoder as measuring sensor, comprise incremental-rotating coder and absolute value rotary encoder.Incremental-rotating coder comprises that there is the photoelectric code disk of axle at a center, logical, the dark groove of annular is arranged on it, read by photoemission and receiving device, obtain four groups of sine wave signals and be combined into A, B, C, D, each sine wave differs 90 degree phase differential, with C, D signals reverse, be superimposed upon on A, the B two-phase, can strengthen stabilization signal; The pulse of a Z phase of revolution output is to represent the zero-bit reference bit in addition.Because A, B two-phase differ 90 degree, can be by A relatively at preceding still B preceding, the forward and reverse with the differentiation scrambler by zero pulse, can obtain the zero-bit reference bit of scrambler.The rotation of the corner connector of absolute value rotary encoder offers the pulse of incremental-rotating coder some.Periodic measurement or the step-by-step counting in the unit interval can be used for measuring mobile speed.If added up at a reference point subsequent pulse number, calculated value has just been represented the parameter of rotational angle or stroke.The absolute value rotary encoder provides a unique coded numeric value for the position of each corner connector.The corner connector of rotary encoder is called shaft coupling again, and it sends the connector of rotary encoder to as the rotation angle information with rotatable parts, can in real time He accurately information to be determined be passed to rotary encoder.
Because drive coil must carry out support fixation by an intrinsic suspension strut device in vibration table, suspension strut device commonly used also has the rocking arm hitch, rolls arm sling on-hook structure etc. and have and support and the member of hanging function except common laminated spring supports, rubber spring supports.No matter adopt any suspension strut device, its common characteristic is that an end of suspension strut device is connected on the drive coil, on the fixed bodies such as other end connection magnetic cylinder seat, change in displacement when drive coil vibrates again must will cause a certain elastic supporting member for supporting optical member of suspension strut device to produce certain elastic deformation, or the variation of an angle of revolving part generation, thereby the inventor is provided with conversion equipment has obtained corresponding drive coil by the measurement to this elastic deformation and angle displacement numerical value just on the suspension supportive device.So just can realize on drive coil, not adding any measurement mechanism with regard to the purpose of energy measurement, guarantee the vibration output performance of drive coil and vibration table to greatest extent to the drive coil shift value.
For different suspension strut devices, the angle output point difference that the corner connector of rotary encoder is connected.For the suspension strut device that is connected by fixed bodies such as a pivot and magnetic cylinder seats and can rotates around a pivot, not only can guarantee that as the angle output point of corner connector the measurement of rotary encoder is stable with this pivot, can also effectively guarantee the accuracy of measurement result.What for example have rotatable secter pat rolls arm sling on-hook structure, and segment angle that can its secter pat connects pivot as the angle output point that connects the corner connector.For devices such as leaf spring hitch with elastic component and rocking arm hitches, the rubber torsion spring of the leaf spring of leaf spring hitch, rocking arm hitch is when drive coil carries out linear reciprocating motion, leaf spring and rubber torsion spring can deform or tilt, because rising just the angle that measures to be changed, the reciprocal rotation that the corner connector of the feasible rotary encoder that is connected with this elastic supporting member for supporting optical member of the distortion of this elastic supporting member for supporting optical member produces certain angle, rotary coding be converted to the straight-line displacement result.Generally with the medium position of elastic supporting member for supporting optical member as the angle output point that connects the corner connector, can guarantee measurement stability to greatest extent like this.
Beneficial effect of the present invention is, the displacement measurement method of this small amplitude rectilinear movement and displacement measuring device utilize shaking table intrinsic drive coil suspension strut device, need on drive coil, not install any device additional and just can obtain corresponding shift value by the turn signal of rotary encoder output, can't produce any influence to the mechanical structure of drive coil, and the signal of rotary encoder output and be digital signal, realization is digital control especially easily.This displacement measurement method can change measuring accuracy according to different requirements with displacement measuring device, and simple in structure, cost is low, reliability is high, can cooperate the suspension strut structure that is applicable to multiple drive coil to measure the shift value of drive coil.
Description of drawings
Fig. 1 is the structural representation of the displacement measuring device of the existing drive coil of using always;
Fig. 2 is the displacement measurement method and the apparatus structure synoptic diagram of the embodiment of the invention 1;
Fig. 3 is the displacement measurement method and the apparatus structure synoptic diagram of the embodiment of the invention 2;
Fig. 4 is the displacement measurement method and the apparatus structure synoptic diagram of the embodiment of the invention 3;
Fig. 5 is the displacement measurement method and the apparatus structure synoptic diagram of the embodiment of the invention 4.
Embodiment
Embodiment 1 as shown in Figure 2, the displacement measurement method of this small amplitude rectilinear movement and displacement measuring device are used for the displacement measurement of reciprocating drive coil, drive coil 1 is realized hanging and supporting by suspension strut device 5, the two ends of suspension strut device 5 connect drive coil 1 and magnetic cylinder seat 2 respectively, adopt rotary encoder 8 as measuring sensor, rotary encoder 8 is fixedly installed on the magnetic cylinder seat 2.By selected angle output point 6 on the suspension strut device of drive coil, connect the corner connector 7 that rotary encoder is set at this angle output point, rotary encoder 8 is measured the anglec of rotation by corner connector 6, can be converted to the shift value of the drive coil of digitizing output like this.
This device utilizes intrinsic drive coil suspension strut device, need not on drive coil, to add any assembly, by inciting somebody to action fast with the mechanical connection of suspension strut device, the reciprocal small amplitude rectilinear movement of the drive coil of high frequency is converted to the discernible crankmotion of rotary encoder, digital signal by scrambler output obtains corresponding drive coil shift value, can change the precision of measurement by the position that changes angle output point 6, satisfy the needs of different measuring situation, show through test, this displacement measuring device is simple in structure, cost is low, the reliability height can cooperate the shift value of the suspension strut structure measurement drive coil that is applicable to multiple drive coil.
Embodiment 2 as shown in Figure 3, the displacement measurement method of this small amplitude rectilinear movement is the displacement measurement that is used for the reciprocating drive coil of high frequency, drive coil 1 is realized hanging and supporting by the rocking arm hitch; the rocking arm hitch is made up of rubber torsion spring 51 and two Rocker arm 5s 2; two ends of rubber torsion spring 51 connect Rocker arm 52 respectively; two rocking arms are connected with magnetic cylinder seat 2 with drive coil 1 respectively, the angle output point 6 that the medium position setting of rubber torsion spring 51 is connected with the corner connector of rotary encoder.When the position of drive coil 1 changes, because rubber torsion spring 51 is an elastic component, can twist, two rocking arms produced when drive coil 1 with magnetic cylinder seat 2 dislocation took place, because rocking arm is rigid structure; rocking arm is a cambered surface with the surface of contact of drive coil and magnetic cylinder seat; the angle of two rocking arms will change with the change in location of drive coil; the rubber torsion spring also crankmotion can take place thereupon; angle output point 6 is set and connects by middle part the corner connector is set, can realize that rotary encoder is to the measurement of this anglec of rotation and be converted to displacement at the rubber torsion spring.
Measure by experiment, this measuring method and measurement mechanism are more stable, can realize the measurement result of different accuracy by the position that changes angle output point 6, and it is low to measure cost and maintenance cost.This device utilizes intrinsic drive coil suspension strut device, need not to add on drive coil any assembly, also need not existing rocking arm hitch is carried out bigger change, has guaranteed the vibration performance of drive coil to greatest extent.
Embodiment 3 as shown in Figure 4, the displacement measurement method of this small amplitude rectilinear movement and measurement mechanism are the displacement measurements that is used for the reciprocating drive coil of high frequency, drive coil 1 is realized hanging and supporting by rolling arm sling on-hook structure, rolling arm sling on-hook structure is made up of a secter pat 53 and flexible sheets 54, the segment angle end and the magnetic cylinder body 2 of secter pat 53 articulate by pivot, be fixed with flexible sheets 54 on the cambered surface of secter pat, the other end and the drive coil of flexible sheets fix 1.The segment angle end of secter pat is connected with fixed body by one, and pivot is as the angle output point 6 that is connected with the corner connector of rotary encoder.
When carrying out the displacement measurement of drive coil, the upper and lower displacement campaign of drive coil directly causes secter pat to center on the variation of pivot generation angle, by the corner connector is connected the pivot that is provided as angle output point 6, fixedly connected this pivot that is provided with of rotary encoder just can be realized accurate and stable measurement.This device utilizes intrinsic drive coil suspension strut device, need not to add on drive coil any assembly, also need not existing rocking arm hitch is carried out bigger change, has guaranteed the vibration performance of drive coil to greatest extent.
Embodiment 4 as shown in Figure 5, the displacement measurement method of this small amplitude rectilinear movement and displacement measuring device are the displacement measurements that is used for the reciprocating drive coil of high frequency, drive coil 1 is realized hanging and supporting by the leaf spring hitch, the leaf spring hitch is made up of the leaf spring 55 of bracing frame 56 and two horizontal parallel settings, the fixedly connected drive coil 1 of one end of two leaf springs, the other end of leaf spring is fixed on the bracing frame 56, bracing frame 56 fixedly installs with magnetic cylinder seat 2, the middle part of last leaf spring is as angle output point 6, and the corner connector of rotary encoder is connected with this angle output point 6.When measuring, when drive coil generation upper and lower displacement, leaf spring deforms thereupon, thereby angle output point 6 is deflected with respect to bracing frame, rotary encoder is installed on the bracing frame, can obtains this deflection angle, and then obtain the shift value of drive coil.This device utilizes intrinsic drive coil suspension strut device, need not to add on drive coil any assembly, also need not existing rocking arm hitch is carried out bigger change, has guaranteed the vibration performance of drive coil to greatest extent.
Claims (10)
1. the displacement measurement method of a small amplitude rectilinear movement, the displacement measurement that is used for reciprocating drive coil, it is characterized in that described displacement measurement method comprises the rotary encoder that employing fixedly installs, the suspension strut device that the corner connector of rotary encoder is connected drive coil, the displacement of this suspension strut device that is caused by the drive coil displacement produces the crankmotion of corner connector, rotary encoder detects the angle changing value of corner connector input and exports digital signal, obtains corresponding shift value.
2. the displacement measurement method of small amplitude rectilinear movement according to claim 1, it is characterized in that described suspension strut device comprises an elastic supporting member for supporting optical member, one end of elastic supporting member for supporting optical member fixedly installs, and the other end connects drive coil, and described corner connector connects the elastic supporting member for supporting optical member of suspension strut device.
3. the displacement measurement method of small amplitude rectilinear movement according to claim 1, it is characterized in that described suspension strut device comprises one by pivotally connected revolving part, the other end of revolving part connects drive coil, the corner connector connects this pivot or revolving part, by the revolving part or the pivot output anglec of rotation.
4. the displacement measurement method of small amplitude rectilinear movement according to claim 1, the suspension strut device that it is characterized in that described drive coil is the rocking arm hitch, described rocking arm hitch comprises rubber torsion spring and rocking arm, the two ends of rubber torsion spring connect two rocking arms respectively, two rocking arms are connected with fixed body with drive coil respectively, and the angle output point that is connected with the corner connector of rotary encoder is set on the rubber torsion spring.
5. the displacement measurement method of small amplitude rectilinear movement according to claim 1, the suspension strut device that it is characterized in that described drive coil is for rolling arm sling on-hook structure, the described arm sling on-hook structure that rolls comprises a secter pat, the segment angle end of secter pat and fixed body articulate, be fixed with flexible sheets on the cambered surface of secter pat, the other end and the drive coil of flexible sheets are fixed, the segment angle end of described secter pat is connected with fixed body by a pivot, and described pivot is as the angle output point that is connected with the corner connector of rotary encoder.
6. the displacement measurement method of small amplitude rectilinear movement according to claim 1, the suspension strut device that it is characterized in that described drive coil is the leaf spring hitch, described leaf spring hitch comprises leaf spring, the two ends of leaf spring are fixed with fixed body and drive coil respectively, and the angle output point that is connected with the corner connector of rotary encoder is set on the described leaf spring.
7. the displacement measuring device of a small amplitude rectilinear movement, the displacement measurement that is used for reciprocating drive coil, it is characterized in that described displacement measuring device comprises the suspension strut device of rotary encoder and drive coil, rotary encoder fixedly installs, the deformable member of the suspension strut device of drive coil or revolving part connect the corner connector of rotary encoder, by the corner connector variation of suspension strut device are input to rotary encoder with the form of the anglec of rotation.
8. the displacement measuring device of small amplitude rectilinear movement according to claim 7, the supported and suspended device that it is characterized in that described drive coil is the rocking arm hitch, described rocking arm hitch comprises rubber torsion spring and rocking arm, the two ends of rubber torsion spring connect two rocking arms respectively, two rocking arms are connected with fixed body with drive coil respectively, the angle output point that is connected with the corner connector of rotary encoder is set on the rubber torsion spring, rotary encoder is fixedly installed on the magnetic cylinder seat, and the angle output point is arranged on the middle part of rubber torsion spring.
9. the displacement measuring device of small amplitude rectilinear movement according to claim 7, it is characterized in that described rotary encoder is fixedly installed on the magnetic cylinder seat, the supported and suspended device of described drive coil is for rolling arm sling on-hook structure, the described arm sling on-hook structure that rolls comprises a secter pat, the segment angle end of secter pat and fixed body articulate, be fixed with flexible sheets on the cambered surface of secter pat, the other end and the drive coil of flexible sheets are fixed, the segment angle end of secter pat is connected with fixed body by a pivot, and described pivot is connected as the angle output point with the corner connector of rotary encoder.
10. the displacement measuring device of small amplitude rectilinear movement according to claim 7, the supported and suspended device that it is characterized in that described drive coil is the leaf spring hitch, the leaf spring hitch comprises leaf spring, the two ends of leaf spring are fixed with fixed body and drive coil respectively, leaf spring is the plural pieces that horizontal parallel is provided with, the fixedly connected drive coil of one end of leaf spring, the other end of leaf spring is fixed on the bracing frame, the middle part of a described leaf spring is as the angle output point, and the corner connector of rotary encoder is connected with this angle output point.
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| CN2008100080176A CN101236125B (en) | 2008-03-04 | 2008-03-04 | Small amplitude rectilinear movement displacement measurement method and its displacement measuring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2468766B (en) * | 2009-03-18 | 2013-03-27 | Helmut Fischer Gmbh Inst Fa R Elektronik Und Messtechnik | Measurement stand and method of its electrical control |
| CN101995207B (en) * | 2009-08-17 | 2015-04-29 | 宝钢集团新疆八一钢铁有限公司 | Equal displacement mechanical transmission type device for detecting equipment motion displacement |
| CN103292765A (en) * | 2013-06-09 | 2013-09-11 | 张家港市鸿嘉数字科技有限公司 | Linear type displacement sensor |
| CN107942622B (en) * | 2017-12-14 | 2023-09-12 | 浙江启尔机电技术有限公司 | Three-degree-of-freedom precise adjustment parallel mechanism based on double flexible pairs |
| CN110160623A (en) * | 2018-04-24 | 2019-08-23 | 北京机电工程研究所 | Hanging and measurement combined system |
| CN109109479A (en) * | 2018-07-25 | 2019-01-01 | 福州市联奇智能科技有限公司 | A kind of intelligence that can remotely control is affixed one's seal robot system |
| CN111397494A (en) * | 2020-03-09 | 2020-07-10 | 五邑大学 | Soft finger convenient to measure |
| CN111623266B (en) * | 2020-06-04 | 2020-12-18 | 孔维袈 | Intelligent eye-protection desk lamp |
| CN112611346A (en) * | 2020-12-11 | 2021-04-06 | 广西电网有限责任公司桂林供电局 | Positioning special tool for energy storage shaft of Siemens mechanism |
| CN113251982B (en) * | 2021-05-22 | 2022-03-01 | 鲁东大学 | Flexible supporting unit of shaft encoder of marine erecting device |
| CN113432980B (en) * | 2021-06-24 | 2024-03-22 | 国网上海市电力公司 | Testing method for tensile property of superconducting cable |
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