CN106205303A - Instructional device and using method thereof for structural mechanics experiment - Google Patents
Instructional device and using method thereof for structural mechanics experiment Download PDFInfo
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- CN106205303A CN106205303A CN201610864479.2A CN201610864479A CN106205303A CN 106205303 A CN106205303 A CN 106205303A CN 201610864479 A CN201610864479 A CN 201610864479A CN 106205303 A CN106205303 A CN 106205303A
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- handwheel
- side plate
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/08—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics
- G09B23/10—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics of solid bodies
Abstract
Present invention is disclosed a kind of instructional device for structural mechanics experiment, instructional device includes that shape rigid frame and a base, described door shape rigid frame include A side plate, B back timber and C side plate, described B back timber is pasted with B foil gauge；Advantages of the present invention simple in construction, using method, may be used for Structural Mechanics Lessons experiment.The structural mechanics experimental provision proposed by this patent and experimental technique thereof, can help the student learning structural mechanics to sharpen understanding " the different mechanical characteristics that statically determinate structure shows under non-load factor effect " from redundant structure.
Description
Technical field
The present invention relates to teaching aid field, particularly for the experimental provision of structural mechanics experimental teaching.
Background technology
The experimental provision being correlated with about the experimental provision that structural mechanics experimental teaching is conventional, rigid frame or truss at present is the most
See, but the internal force that great majority are measurement structure to be produced under load action and displacement, and there is no measurement structure in non-load factor
Internal force under Zuo Yong and the corresponding function of displacement, it is impossible to meet structural mechanics experimental teaching demand.
Summary of the invention
The technical problem to be solved is to realize a kind of internal force measuring structure under non-load factor effect and position
The experimental teaching unit moved.Experimental provision can realize the rapid translating between statically determinate structure and redundant structure, explanation static determinacy
Structure and redundant structure show different mechanical property under non-load factor effect.
To achieve these goals, the technical solution used in the present invention is: for the instructional device of structural mechanics experiment, religion
Learn device and include that shape rigid frame and a base, described door shape rigid frame include A side plate, B back timber and C side plate, described B back timber is pasted with
B foil gauge；
Described C side plate includes the upper plug-in unit affixed with B back timber and coordinates the lower sleeve of mutually socket, institute with upper plug-in unit
Stating fixed rotating shaft on base, the both sides, bottom of described lower sleeve are fixing is connected to chain bar, and described chain bar is each attached in rotating shaft, described
The base on chain bar side is provided with baffle plate, described baffle plate and chain bar and is provided with the pin-and-hole matched, when described baffle plate and the pin of chain bar
When hole is inserted into the second pin, described rotating shaft is locked out, and described upper plug-in unit top is provided with the first handwheel, by described first-hand wheel driving
The dynamic push rod with thread segment runs through plug-in unit and is supported on described lower sleeve, and described C side plate is pasted with C foil gauge；
Being placed with mobile platform in the chute of described base, described A side plate is placed on above mobile platform, described A side plate
The mobile platform of both sides is provided with bearing block, and the support shaft that the both sides of described A side plate bottom each extend over out is fixed in axle bed,
The direction that the axis direction of described support shaft slides relatively with mobile platform and base is identical, and the described support shaft of one is provided with
Pin-and-hole logical the first pin inserted are locked in the pin-and-hole of mobile platform, and another described support shaft connects biography by shaft coupling
Moving axis, described power transmission shaft is rotated by the worm and gear Component driver fixed on a mobile platform, and described worm and gear assembly is by the
Three handwheels drive, and the chute of described base is provided with lockhole, are provided with the locking bar by extruding locking mobile platform in described lockhole,
Described locking bar is provided with thread segment and is stretched by second-hand's wheel drive, and described base is fixed with handwheel support, and described handwheel props up
Frame is provided with and is driven, by the 4th handwheel, the gear rotated, and described gear engages with the tooth bar on A side plate, described tooth bar and support shaft
Axis direction parallel, described A side plate is pasted with A foil gauge；Described A foil gauge, B foil gauge and C foil gauge output signal
To deformeter.
The height of described A side plate and C side plate is d, and described A strain gauge adhesion is in the A side of distance base d/4 height and position
On plate, described C strain gauge adhesion is on the C side plate of distance base d/4 height and position, and the described a length of L of B back timber, described B strain
Sheet is pasted onto on the B back timber of distance A side plate L/4 position.
Described C strain gauge adhesion is under C side plate on sleeve.
Described d/L=1/2.
Using method based on the described instructional device for structural mechanics experiment, tests including statically determinate structure:
Extract the first pin and the second pin, three foil gauges are connected with three groups of both arms half-bridge connections, by resistance-strain
Instrument installs and is set to 0；
1) rotating the 3rd handwheel, by Worm Wheel System, revolving force is delivered in the support shaft of rigid frame by shaft coupling, obtains
Take the numerical value of three foil gauges；
2) unclamp the 3rd handwheel the 4th handwheel, mobile traverser, obtain the numerical value of three foil gauges；
3) the first handwheel is rotated so that produce relative displacement between the component of rigid frame C side plate, obtain the number of three foil gauges
Value.
Also include that redundant structure is tested:
Plugging the first pin and the second pin, the rigid frame in experimental provision becomes statically indeterminate rigid frame；
1) the first handwheel is rotated so that produce relative displacement between the component of rigid frame C side plate, obtain the number of three foil gauges
Value；
2) rotate the first handwheel, eliminate and produce relative displacement between rigid frame C lateral plate member and deformeter is set to 0, rotate hands
4th handwheel, mobile traverser, obtain the numerical value of three foil gauges；
3) rotate the first handwheel, eliminate and between rigid frame C lateral plate member, produce relative displacement, extract the first pin, rotate the
Four handwheels, by mobile platform adjustment of displacement to sliding into chute of base end of travel, then rotate hands the second handwheel, and locking is mobile flat
Platform, and deformeter is set to 0；Rotate the 3rd handwheel, rotated by worm and wormwheel and the support shaft of rigid frame is rotated, obtain three
The numerical value of individual foil gauge；
4) rotate the first handwheel, eliminate and between rigid frame C lateral plate member, produce relative displacement, extract the first pin, plug the
Two pins, rotate the 4th handwheel by the adjustment of displacement of mobile platform to sliding into chute of base end of travel, are set to 0 by deformeter,
Rotate the 4th handwheel, after dynamic mobile traverser produces displacement of the lines Δ, by rotating the second locking mobile platform, then rotate the 3rd
Handwheel, is rotated by worm and wormwheel and the lead of rigid frame is rotated, produce side plate angular displacement, obtain three foil gauges
Numerical value.
Advantages of the present invention simple in construction, using method, may be used for Structural Mechanics Lessons experiment.Pass through this patent
The structural mechanics experimental provision proposed and experimental technique thereof, the student learning structural mechanics can be helped to sharpen understanding, and " static determinacy is tied
The different mechanical characteristics that structure shows under non-load factor effect from redundant structure ".
Accompanying drawing explanation
Labelling in the content expressed every width accompanying drawing in description of the invention below and figure is briefly described:
Fig. 1 is for the instructional device structural representation of structural mechanics experiment；
Fig. 2-4 is experiment device for teaching partial schematic diagram in Fig. 1；
Fig. 5 is rigid frame stress and patch location schematic diagram；
Labelling in above-mentioned figure is: 1, rigid frame；2, foil gauge；3, the first handwheel；4, chain bar；5, baffle plate；6, base；7、
Worm and gear assembly；8, the second handwheel；9, the 3rd handwheel；10, mobile platform；11, handwheel support；12, the 4th handwheel；13. axles
Bearing；14, the first pin；15, the second pin；16, shaft coupling.
Detailed description of the invention
A kind of structural mechanics experimental provision that this patent is proposed, by measure non-load factor (as side plate move, material
Material contraction, temperature change, foozle etc.) act on lower statically determinate rigid frame 1 structure and the internal force of statically indeterminate rigid frame 1 structure, verify and exist
The different mechanical behavior that under non-load factor effect, statically determinate structure and redundant structure are showed, i.e. in non-load factor effect
The internal force of lower statically determinate structure will not change, but the internal force of redundant structure can change under non-load factor effect.
This patent is connected the pin of hinge by pinning or removing between rigid frame 1 and base 6, it is achieved between static determinacy and redundant structure
Conversion.The experimental provision that this patent is proposed, may be used for Structural Mechanics Lessons experiment.The structure proposed by this patent
Dynamics experimental device and experimental technique thereof, the student learning structural mechanics can be helped to sharpen understanding, and " statically determinate structure is with indeterminate
The different qualities that structure shows under non-load factor effect ".
For the instructional device of structural mechanics experiment, including rigid frame 1, foil gauge the 2, first handwheel 3, chain bar 4, baffle plate 5, the end
Seat 6, worm and gear assembly the 7, second handwheel the 8, the 3rd handwheel 9, mobile platform 10, handwheel support the 11, the 4th handwheel 12. bearing block
13, first pin the 14, second pin 15, shaft coupling 16.
Rigid frame 1 is in shaped door, by A side plate, B back timber with C side plate is affixed constitutes.
C side plate includes the upper plug-in unit affixed with B back timber and coordinates the lower sleeve of mutually socket, both structures with upper plug-in unit
Becoming grafting relation, and energy relative motion, fixed rotating shaft on base 6, rotating shaft level is fixed by bearing, can rotate on base 6,
The both sides, bottom of lower sleeve are fixing is connected to chain bar 4, and two chain bars 4 are each attached in rotating shaft, then descend the sleeve can be with axis of rotation, chain
The base 6 on bar side is provided with baffle plate 5, is preferably provided with the most corresponding two the chain bars 4 of two baffle plates 5, and baffle plate 5 and chain bar 4 are provided with
The pin-and-hole matched, when the pin-and-hole of baffle plate 5 and chain bar 4 is inserted into the second pin 15, rotating shaft is locked out.
Upper plug-in unit top is provided with the first handwheel 3, the first handwheel 3 push rod with thread segment driven runs through upper plug-in unit also
It is supported on lower sleeve, so by rotating the first handwheel 3, then so that upper plug-in unit is relative with lower sleeve slides.
Being placed with mobile platform 10 in the chute of base 6, A side plate is placed on above mobile platform 10, and only contact is not connected to,
The mobile platform 10 of A side plate both sides is provided with bearing block 13, and the support shaft that the both sides of A side plate bottom each extend over out is fixed respectively
On bearing block 13, the direction that the axis direction of support shaft slides relatively with mobile platform 10 and base 6 is identical, and one supports
Axle is provided with pin-and-hole and logical the first pin 14 inserted is locked in the pin-and-hole of mobile platform 10, and another support shaft passes through shaft coupling
Device 16 connects power transmission shaft, and power transmission shaft is driven rotation, worm and gear assembly by the worm and gear assembly 7 fixed on a mobile platform 10
7 are driven by the 3rd handwheel 9, so rotate the 3rd handwheel 9, and power transmission shaft then can transmit revolving force to support shaft.
The chute of base 6 is provided with lockhole, is provided with the locking bar by extruding locking mobile platform 10, locking bar sets in lockhole
Have thread segment and driven flexible by the second handwheel 8, by rotating the second handwheel 8, then can control base 6 and mobile platform 10 it
Between locking and sliding relation.
Being fixed with handwheel support 11 on base 6, handwheel support 11 is provided with the gear being driven rotation by the 4th handwheel 12, tooth
Wheel engages with the tooth bar on A side plate, and tooth bar is parallel with the axis direction of support shaft, by rotating the 4th handwheel 12, then can control
Mobile platform 10 processed slides in the chute of base 6 and slides up and down.
As it is shown in figure 5, rigid frame 1 deforms under non-load factor effect, rigid frame 1 may be moved by side plate and turn
Dynamic, if vertically movable for c, it is θ around side plate rotational angle.
It is pasted with A foil gauge 2 on A side plate, C side plate is pasted with C foil gauge 2, B back timber is pasted with B foil gauge 2, A side
The height of plate and C side plate is d, A foil gauge 2 and is pasted onto on the A side plate of distance base 6d/4 height and position, and C foil gauge 2 is pasted
On the C side plate of distance base 6d/4 height and position, a length of L of B back timber, B foil gauge 2 is pasted onto distance A side plate L/4 position
On B back timber.C foil gauge 2 is pasted onto under C side plate on sleeve.Taking rise-span ratio h/L=1/2, A foil gauge 2, B foil gauge 2 and C strain
Sheet 2 outputs signal to deformeter.
Three resistance strain gages 2 of rigid frame 1, by the work strain at static resistance strain-ga(u)ge measurement paster, according to public affairs
Formula:
M=E ε W
Computational methods obtain the moment of flexure of rigid frame 1 cross section at paster, and in formula, E is the elastic modelling quantity of material, and ε is to measure point
Work strain, W is the module of anti-bending section in cross section.
The operation principle of said apparatus:
The statically determinate rigid frame 1 internal force on non-load factor effect lower member cross section is theoretically equal to 0, and as shown in Figure 1
Statically indeterminate rigid frame 1 internal force under non-load factor effect solve and need to solve 3 statically indeterminate problems.Utilize force method to solve this to surpass
Statically problem, as h/l=1/2, when there is side plate displacement of the lines and angular displacement, rigid frame 1A, at B, C, section turn moment is simultaneously
In formula: EI is the bending rigidity of beam, l is the span of beam, and Δ is side plate displacement of the lines, and θ is side plate angular displacement.
Rigid frame 1A, B, C internal force experiments of measuring value utilizes resistance strain measurement method to measure the strain stress of A, B, CA,εB,εCIf,
Using both arms half-bridge connection, its moment of flexure experiment value computing formula is [5]:
Mi=WzE(εi1-εi2) i=A, B, C
In formula: WzFor cross section bending resistant section coefficient,B is the width of experiment rigid frame 1, and H is experiment rigid frame 1
Highly.
E is the elastic modelling quantity of material, εi1,εi2It is the cross section reading strain of inside and outside measuring a little respectively.
Using method based on the instructional device tested for structural mechanics:
Statically determinate structure:
Extracting the first pin 14 and the second pin 15, the rigid frame 1 in experimental provision is statically determinate rigid frame 1, and deformeter is adjusted 0.
1) the 3rd handwheel 9, by Worm Wheel System, revolving force is delivered in the support shaft of rigid frame 1 by shaft coupling 16, sees
Examine the strain at A, B, C point and have unchanged (unchanged).Illustrate that side plate occurs angle to move and statically determinate structure internal force will not be caused to occur
Change
2) unclamp the 3rd handwheel 9, and rotate the 4th handwheel 12, mobile traverser, observe strain at A, B, C point with or without
Change (unchanged).Illustrate that side plate generation displacement of the lines will not cause statically determinate structure internal force to change.
3) the first handwheel 3, makes to produce between rigid frame 1B lateral plate member relative displacement by worm drive, observes A, B, C
Strain at Dian has unchanged (unchanged).Simulation foozle or temperature change will not cause statically determinate structure internal force to become
Change.
Note: above-mentioned 3 kinds it may is that operation independently, it is also possible to carry out, it is possible to observe structure position simultaneously
The change moved.
Redundant structure:
Plugging the first pin 14 and the second pin 15, the rigid frame 1 in experimental provision becomes statically indeterminate rigid frame 1, should simultaneously
Become instrument and adjust 0.
1) the first handwheel 3, by worm drive make between rigid frame 1B lateral plate member produce relative displacement Δ, observe A, B,
Strain at C point has unchanged (changing).Simulation foozle or temperature change can cause statically determinate structure internal force to change.
Measure the strain at A, B, C point, calculate measured value according to (2) formula, and compare with theoretical value and calculate error.
Mi=EW εi(i=A, B, C) (2)
Theoretical according to structural mechanics, application force method solves 3 shown in Fig. 1 time statically indeterminate problem, as d=L/2, A, B, C
The moment of flexure theoretical value of corresponding rigid frame 1 section at Dian:
In formula: W module of anti-bending section,
The elastic modelling quantity of E material.
The moment of inertia of I-cross section centering axle
2) the first handwheel 3, is eliminated by worm drive and produces relative displacement between rigid frame 1B lateral plate member and by deformeter
Setting to 0, the 4th handwheel 12, move traverser by worm drive, observing the strain at A, B, C point has unchanged (changing).
Illustrate that side plate is subjected to displacement c and statically determinate structure internal force can be caused to change.Measure the strain at A, B, C point, calculate according to (2) formula
Measured value, and compare with theoretical value and calculate error.Compare with theoretical value and calculate error.Correspondence rigid frame 1 cross section at A, B, C point
The Δ that replaces in formula in (3) with c of the theoretical value of moment of flexure.
3) the first handwheel 3, eliminates the relative displacement between rigid frame 1B lateral plate member by worm drive, extracts the first pin
14, the 4th handwheel 12 is by the adjustment of displacement of mobile platform 10 to 0 point, and mobile platform 10 locked by the second handwheel 8, and by deformeter
Set to 0.3rd handwheel 9, is rotated by worm and wormwheel and the support shaft of rigid frame 1 is rotated, and observing the strain at A, B, C point has
Unchanged (changing).Illustrate that mobile platform 10 rotation displacement θ can cause statically determinate structure internal force to change.Measure A, B, C point
The strain at place, calculates measured value according to (2) formula, compares with theoretical value and calculate error.
The now moment of flexure theoretical value of the corresponding section of rigid frame 1 at A, B, C point:
Wherein: θ-for rigid frame 1 side plate rotational angle；
4) the first handwheel 3, eliminates the relative displacement between rigid frame 1 right-hand member by worm drive, extracts the first pin
14, deformeter to 0 point, is set to 0 by the 4th handwheel 12 by the adjustment of displacement of mobile platform 10.4th handwheel 12, passes through worm drive
After mobile traverser produces displacement c, lock mobile platform 10 by the second handwheel 8.3rd handwheel 9, is turned by worm and wormwheel
Dynamic the support shaft of rigid frame 1 being rotated, produce side plate rotation displacement θ, observing the strain at A, B, C point has and unchanged (has
Change).Illustrate to occur side plate to move c simultaneously and side plate rotates θ and statically determinate structure internal force can be caused to change.Measure A, B, C point
The strain at place, calculates measured value according to (2) formula, compares with theoretical value and calculate error.
The now moment of flexure theoretical value of the corresponding section of rigid frame 1 at A, B, C point:
Wherein: θ-for rigid frame 1 side plate rotational angle, C is the vertically movable displacement of the lines that side plate produces
Above-mentioned experimentation and result can be visually observed that the change of displacement structure, illustrate to close in structural mechanics
The mechanical characteristics showed under non-load factor effect in statically determinate structure and redundant structure is i.e.:
(1) statically determinate structure non-load factor (as side plate move, the change of Material shrinkage, temperature, foozle etc.) effect
Lower meeting causes structure to produce displacement, but the internal force of structure will not change.
(2) redundant structure not only can cause structure to produce displacement under non-load factor effect, also can cause structure
Internal force changes.
Above in conjunction with accompanying drawing, the present invention is exemplarily described, it is clear that the present invention implements not by aforesaid way
Restriction, as long as have employed the method design of the present invention and the improvement of various unsubstantialities that technical scheme is carried out, or without changing
Enter and design and the technical scheme of the present invention are directly applied to other occasion, all within protection scope of the present invention.
Claims (6)
1. for the instructional device of structural mechanics experiment, it is characterised in that: instructional device includes shape rigid frame and a base, described door
Shape rigid frame includes A side plate, B back timber and C side plate, on described B back timber on be pasted with B foil gauge；
Described C side plate includes the upper plug-in unit affixed with B back timber and coordinates the lower sleeve of mutually socket, the described end with upper plug-in unit
Fixed rotating shaft on seat, the both sides, bottom of described lower sleeve are fixing is connected to chain bar, and described chain bar is each attached in rotating shaft, described chain bar
Other base is provided with baffle plate, described baffle plate and chain bar and is provided with the pin-and-hole matched, when in the pin-and-hole of described baffle plate and chain bar
When inserting the second pin, described rotating shaft is locked out, and described upper plug-in unit top is provided with the first handwheel, by described first-hand wheel drive
The push rod with thread segment runs through plug-in unit and is supported on described lower sleeve, and described C side plate is pasted with C foil gauge；
Being placed with mobile platform in the chute of described base, described A side plate is placed on above mobile platform, described A side plate both sides
Mobile platform be provided with bearing block, the support shaft that the both sides of described A side plate bottom each extend over out is fixed in axle bed, described
The direction that the axis direction of support shaft slides relatively with mobile platform and base is identical, and the described support shaft of one is provided with pin-and-hole
And the first pin leading to insertion is locked in the pin-and-hole of mobile platform, another described support shaft connects transmission by shaft coupling
Axle, described power transmission shaft is rotated by the worm and gear Component driver fixed on a mobile platform, and described worm and gear assembly is by the 3rd
Handwheel drives, and the chute of described base is provided with lockhole, is provided with the locking bar by extruding locking mobile platform, institute in described lockhole
State locking bar be provided with thread segment and stretched by second-hand's wheel drive, described base is fixed with handwheel support, described handwheel support
Being provided with and driven, by the 4th handwheel, the gear rotated, described gear engages with the tooth bar on A side plate, described tooth bar and support shaft
Axis direction is parallel, and described A side plate is pasted with A foil gauge；Described A foil gauge, B foil gauge and C foil gauge output signal to
Deformeter.
Instructional device for structural mechanics experiment the most according to claim 1, it is characterised in that: described A side plate and C side
The height of plate is d, and described A strain gauge adhesion is on the A side plate of distance base d/4 height and position, and described C strain gauge adhesion exists
On the C side plate of distance base d/4 height and position, the described a length of L of B back timber, described B strain gauge adhesion is in distance A side plate L/4 position
On the B back timber put.
Instructional device for structural mechanics experiment the most according to claim 2, it is characterised in that: described C foil gauge glues
It is attached under C side plate on sleeve.
4. according to the instructional device for structural mechanics experiment described in Claims 2 or 3, it is characterised in that: described d/L=1/
2。
5. using method based on the instructional device tested for structural mechanics described in claim 1-4, it is characterised in that include
Statically determinate structure is tested:
Extract the first pin and the second pin, three foil gauges are connected with three groups of both arms half-bridge connections, resistance strain gauge is put
It is set to 0；
1) rotating the 3rd handwheel, by Worm Wheel System, revolving force is delivered in the support shaft of rigid frame by shaft coupling, obtains three
The numerical value of individual foil gauge；
2) unclamp the 3rd handwheel the 4th handwheel, mobile traverser, obtain the numerical value of three foil gauges；
3) the first handwheel is rotated so that produce relative displacement between the component of rigid frame C side plate, obtain the numerical value of three foil gauges.
Using method the most according to claim 5, it is characterised in that also include that redundant structure is tested:
Plugging the first pin and the second pin, the rigid frame in experimental provision becomes statically indeterminate rigid frame；
1) the first handwheel is rotated so that produce relative displacement between the component of rigid frame C side plate, obtain the numerical value of three foil gauges；
2) rotate the first handwheel, eliminate and produce relative displacement between rigid frame C lateral plate member and deformeter is set to 0, rotate hands the 4th
Handwheel, mobile traverser, obtain the numerical value of three foil gauges；
3) rotate the first handwheel, eliminate and between rigid frame C lateral plate member, produce relative displacement, extract the first pin, rotate the 4th hands
Wheel, by mobile platform adjustment of displacement to sliding into chute of base end of travel, then rotates hands the second handwheel, locks mobile platform,
And deformeter is set to 0；Rotate the 3rd handwheel, rotated by worm and wormwheel and the support shaft of rigid frame is rotated, obtain three
The numerical value of foil gauge；
4) rotate the first handwheel, eliminate and between rigid frame C lateral plate member, produce relative displacement, extract the first pin, plug the second pin
Nail, rotates the 4th handwheel by the adjustment of displacement of mobile platform to sliding into chute of base end of travel, is set to 0 by deformeter, rotate
4th handwheel, after dynamic mobile traverser produces displacement of the lines Δ, by rotating the second locking mobile platform, then rotates the 3rd hands
Wheel, is rotated by worm and wormwheel and the lead of rigid frame is rotated, produce side plate angular displacement, obtain three foil gauges
Numerical value.
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| CN107978202A (en) * | 2017-12-18 | 2018-05-01 | 安徽工程大学 | Multifunction experiment apparatus and experimental method |
| CN112346534A (en) * | 2020-11-25 | 2021-02-09 | 石家庄学院 | Satellite-borne VPX board pressing and pulling device, operating console and method |
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| CN106205303B (en) | 2022-02-11 |
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