CN110285940A - Stiffness measurement system - Google Patents
Stiffness measurement system Download PDFInfo
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- CN110285940A CN110285940A CN201910646654.4A CN201910646654A CN110285940A CN 110285940 A CN110285940 A CN 110285940A CN 201910646654 A CN201910646654 A CN 201910646654A CN 110285940 A CN110285940 A CN 110285940A
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- sliding block
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- loading device
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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
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
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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
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0075—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by means of external apparatus, e.g. test benches or portable test systems
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- Aviation & Aerospace Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention proposes a kind of stiffness measurement system, it include: self-level(l)ing normal direction loading device, linear drives force loading device, slide block device, Optical Fibre Displacement Measuring Unit and video image acquisition device, wherein, slide block device includes: upper fixed block from top to bottom, sliding block sample and lower fixed block, wherein, self-level(l)ing normal direction loading device, including normal pressure detection components and normal pressure component, normal pressure component is connect with lower fixed block, wherein, linear drives force loading device includes tangential pressure component and tangential pressure detection components, tangential pressure component is fixedly connected with the side of sliding block sample, the relative displacement of Optical Fibre Displacement Measuring Unit measurement contact interface, the light spot image of video image acquisition device acquisition contact interface.It solves the problems, such as to cause interface shear stiffness measurement accuracy not high due to not accounting for actual contact state change in traditional measurement.
Description
Technical field
Design rigidity field of measuring technique of the present invention especially designs a kind of stiffness measurement system.
Background technique
Rigidity is to study the significant consideration of interface CONTACT WITH FRICTION.In joint during transmission force, due to rigidity
It is loaded in the presence of concussion is often generated；When carrying out load transmission by friction, rigidity can cause fatigue and wear and then cause to lose
Effect；At present still can not accurate characterization contact interface generate additional rigidity.In high-precision equipment, it is desirable that more accurate prediction
System dynamic response seeks to more accurately characterize rigidity from aerodynamic point understanding.
In 20 middle of century, Cattaneo and Mindlin propose normal direction and the prediction model that circumferential load lower sphere contacts.
Nineteen fifty-five Johnson demonstrates the validity of the prediction model of Mindlin by experimental study.1966, Greenwood and
Williamson thinks the quantity that micro-bulge is contacted in Rough Contact and real contact area and load is proportional relationship.Kró
Likowski and Szczepek demonstrates Greenwood and Williamson by ultrasonic measurement normal direction and shear stiffness
Model, discovery shear stiffness depend primarily on Poisson's ratio.2011, Kartal passed through experimental verification tangent stiffness and contact surface
Product is positively correlated, and the shear stiffness of contact interface is determined by normalized method.Barzrafshan in 2018 is by testing
Tangential force and normal force meet Cattaneo-Mindlin prediction model when having demonstrate,proved identical material, and thinking can be to close material
The coupled relation of material contact carries out ignoring processing.But when different materials contact, normal force can not be decoupled with tangential force, at present to it
Still without preferable solution.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, solving in traditional measurement it is an object of the invention to propose a kind of stiffness measurement system due to not examining
Consider the problem that actual contact state change causes interface shear stiffness measurement accuracy not high.
In order to achieve the above object, the embodiment of the present invention proposes a kind of stiffness measurement system, including self-level(l)ing normal direction load dress
It sets, linear drives force loading device, slide block device, Optical Fibre Displacement Measuring Unit and video image acquisition device, wherein sliding block dress
Set includes: upper fixed block, sliding block sample and lower fixed block from top to bottom, wherein self-level(l)ing normal direction loading device, including normal direction pressure
Power detection components and normal pressure component, normal pressure component are connect with lower fixed block, wherein linear drives force loading device packet
Tangential pressure component and tangential pressure detection components are included, tangential pressure component is fixedly connected with the side of sliding block sample, wherein institute
Self-level(l)ing normal direction loading device is stated, for providing normal pressure by the normal pressure component for the slide block device, and is led to
Cross the normal pressure detection components detection normal direction pressure value；The linear drives force loading device, for by described tangential
Pressure assembly provides tangential force for the sliding block sample, and detects tangential pressure value by the tangential pressure detection components；Institute
Slide block device is stated, is used under the self-level(l)ing normal direction loading device and linear drives force loading device effect, so that institute
It states sliding block sample and the upper fixing block and the lower fixed block is respectively formed contact interface；The Optical Fibre Displacement Measuring Unit,
For acquiring the interface relative displacement between the sliding block sample and the lower fixed block；The video image acquisition device, is used for
Form light spot image on contact interface between the sliding block sample and the lower fixed block, and described in acquiring in real time by camera
The light spot image of sliding block sample and the lower fixed block.
In the embodiment of the present invention, the normal pressure component include: U-shaped briquetting, groups of springs, lower lock block, two sliding blocks,
Two guide rails and two baffles, wherein the U-shaped briquetting, the sliding block, the groups of springs and the lower lock block divide from top to bottom
The top edge of the described two baffles of cloth is fixedly connected on the bottom surface of the upper mounting plate of the stiffness measurement system, described two guide rails point
It is not fixed on the side of described two baffles；The lower lock block is fixedly connected with the U-shaped briquetting by groups of springs；The U
Type briquetting is bolted to connection with the lower fixed block, and the U-shaped briquetting two sides and the sliding block are solid by bolt
Fixed connection；The sliding block slides up and down in the mobile space that the guide rail is formed.
In the embodiment of the present invention, the normal pressure detection components, comprising: disc type sensor, pinboard and normal direction
Loading bench, wherein the normal direction loading bench is fixedly connected on the top surface of the lower platform of the stiffness measurement system, the normal direction
The top surface of loading bench is bolted with the pinboard；The bottom surface of the disc type sensor and the pinboard pass through spiral shell
Bolt is fixedly connected, and the top surface of the disc type sensor is bolted to connection with the lower lock block.
In the embodiment of the present invention, the tangential pressure component, comprising: pedestal, tangentially load electric cylinder, linear bearing,
Bearing base and push rod, wherein the pedestal is fixedly connected with the bottom surface of the upper mounting plate of the stiffness measurement system；It is described tangential
Electric cylinder is loaded, is bolted to connection with the pedestal；The linear bearing is fixedly connected with the bearing base, and
And the bearing base is fixedly connected with the bottom surface of the upper mounting plate of the stiffness measurement system；The push rod is stuck in the straight line
In bearing, it is fixedly connected with the sliding block sample.
In the embodiment of the present invention, the tangential pressure detection components, comprising: S type sensor, wherein the S type sensing
Device, with the push rod and the tangential load electric cylinder by being fixedly connected.
In the embodiment of the present invention, the side of the sliding block sample is fixedly connected with the push rod by seccotine.
In the embodiment of the present invention, the Optical Fibre Displacement Measuring Unit, comprising: optical fiber adjusting bracket, fiber optics displacement calculating group
Part, two fibre-optical probes, wherein the optical fiber adjusting bracket is fixedly connected with the bottom surface of the upper mounting plate of the stiffness measurement system；
Described two fibre-optical probes are fixed on the optical fiber adjusting bracket, and described two fibre-optical probes pass through optical fiber and the light
Fibre displacement computation module connection.
In the embodiment of the present invention, the video image acquisition device, comprising: fiber coupler, laser controller, calculating
Machine, camera, front surface mirror, linear slit, angular adjustment frame and laser aligner, wherein the laser controller, with institute
Fiber coupler is stated to connect by data line；The laser aligner is connect with the fiber coupler by optical fiber；It is described to swash
Optical collimator is bolted to connection with the angular adjustment frame；The front surface mirror is fixed on institute by seccotine
On the upper mounting plate for stating stiffness measurement system, close to the side of the lower fixed block；The camera is fixed on described by tripod
Slide block device front upper place position, and connect by data line with the computer, video image acquisition is controlled by the computer.
In addition, in the embodiment of the present invention, stiffness measurement system, further includes: signal sampler, wherein the signal is adopted
Collect instrument and the fiber optics displacement computation module, the normal pressure detection components and the tangential pressure detection components communication link
It connects.
The stiffness measurement system of the embodiment of the present invention is applied by linear drives force loading device and is moved back and forth, but real
Now to the measurement of the quasi-static shear stiffness of contact interface；Applied by linear drives force loading device and moved along a straight line, but realized
Measurement to contact interface dynamic shear stiffness；It is true to the power of contact interface, displacement and interface simultaneously during the experiment
Contact condition variation is acquired in real time, can calculate the shear stiffness based on actual contact state change；Pass through self-level(l)ing method
To loading device, it can be achieved that carrying to contact interface, guarantee that contact surface is uniform during slide block movement；Linear driving force load
Device ensures the straightness of tangential motion, improves the measurement accuracy of shear stiffness；By adjusting normal load size and tangentially
Fltting speed can study normal direction loading velocity and load, the influence to interface shear stiffness；Based on simultaneously to contact interface
The characteristics of power, displacement and interface actual contact state change are acquired in real time, this experimental bench can also be used for Contact Pair interface
Stick-slip experiment.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is a kind of stiffness measurement system structure diagram provided by the embodiment of the present invention；
Fig. 2 is the front view of contact interface shear stiffness dynamic measurement system according to an embodiment of the invention；
Fig. 3 is the left view of contact interface shear stiffness dynamic measurement system according to an embodiment of the invention；
Fig. 4 is the Facad structure signal of contact interface shear stiffness dynamic measurement system according to an embodiment of the invention
Figure；
Fig. 5 is the backside structure signal of contact interface shear stiffness dynamic measurement system according to an embodiment of the invention
Figure；
Fig. 6 is that the self-level(l)ing normal direction of contact interface shear stiffness dynamic measurement system according to an embodiment of the invention adds
The partial structure diagram of load；
Fig. 7 is that the linear driving force of contact interface shear stiffness dynamic measurement system according to an embodiment of the invention adds
It carries and sets；
Fig. 8 is the relative displacement measurement of contact interface shear stiffness dynamic measurement system according to an embodiment of the invention
Device；
Fig. 9 is the knot of the slide block device of contact interface shear stiffness dynamic measurement system according to an embodiment of the invention
Structure schematic diagram；
Figure 10 is that the video image of contact interface shear stiffness dynamic measurement system according to an embodiment of the invention is adopted
Acquisition means schematic diagram；
Figure 11 is actual contact circle of contact interface shear stiffness dynamic measurement system according to an embodiment of the invention
Face imaging schematic diagram.
Drawing reference numeral: lower platform 1, support rod 2, drive motor controller 3, signal sampler 4, upper mounting plate 5, fiber optics displacement
Mersure Controler 6, fiber coupler 7, laser controller 8, pedestal 9 are tangential to load electric cylinder 10, S type sensor 11, baffle
12, linear bearing 13, bearing base 14, push rod 15, upper fixed block 16, sliding block sample 17, lower fixed block 18, optical fiber adjusting bracket
19, fibre-optical probe 20, fibre-optical probe 21, computer 22, baffle 23, U-shaped briquetting 24, sliding block 25, groups of springs 26, lower lock block 27,
Guide rail 28, disc type sensor 29, pinboard 30, camera 31, normal direction loading bench 32, guide rail 33, sliding block 34, front surface mirror
35, linear slit 36, angular adjustment frame 37, laser aligner 38, self-level(l)ing normal direction loading device 100, linear driving force load
Device 110, normal pressure detection components 111, normal pressure component 112, tangential pressure component 113, tangential pressure detection components
114, slide block device 120, video image acquisition device 130, Optical Fibre Displacement Measuring Unit 131.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings the stiffness measurement system of the embodiment of the present invention is described.
Fig. 1 is a kind of structural schematic diagram of stiffness measurement system provided by the embodiment of the present invention.
As shown in Figure 1, according to one embodiment of present invention, stiffness measurement system, comprising: self-level(l)ing normal direction loading device
100, linear drives force loading device 110, slide block device 120, video image acquisition device 130 and Optical Fibre Displacement Measuring Unit
131, wherein slide block device 120 includes: upper fixed block 16, sliding block sample 17 and lower fixed block 18 from top to bottom, wherein self-regulated
Flat normal direction loading device 100, including normal pressure detection components 111 and normal pressure component 112, normal pressure component 112 with
Lower fixed block 18 connects, wherein linear drives force loading device 110 includes tangential pressure component 113 and tangential pressure detection group
Part 114, tangential pressure component 113 are fixedly connected with the side of sliding block sample 17, wherein self-level(l)ing normal direction loading device 100 is used
It is that slide block device 120 provides normal pressure, and is detected by normal pressure detection components 111 in passing through normal pressure component 112
Normal pressure value；Linear drives force loading device 110, for being that sliding block sample 17 provides tangentially by tangential pressure component 113
Power, and tangential pressure value is detected by tangential pressure detection components 114；Slide block device 120 is filled for loading in self-level(l)ing normal direction
It sets under 100 and the effect of linear drives force loading device 110, so that sliding block sample 17 and upper fixed block 16 and lower fixed block 18 are distinguished
Form contact interface；Optical Fibre Displacement Measuring Unit 131, the opposite position in interface for acquiring between sliding block sample 17 and lower fixed block 18
It moves；Video image acquisition device 130 forms hot spot figure on the contact interface between sliding block sample 17 and lower fixed block 18
Picture, and pass through the real-time light spot image of camera 31 acquisition sliding block sample 17 and lower fixed block 18.
Specifically, as a kind of possible implementation, tangential motion is ensured by linear drives force loading device 110
Straightness realizes the load to contact interface by self-level(l)ing normal direction loading device 100, during the experiment simultaneously to contact circle
Power, displacement and the interface actual contact state change in face are realized by self-level(l)ing normal direction loading device 100 to experimentation
The dynamic of median surface contact force measures；By Optical Fibre Displacement Measuring Unit 131, the reality of the displacement to contact interface front end face is realized
When measure；By video image acquisition device 130, for forming hot spot figure on sliding block sample and lower fixed block indirection touching interface
Picture, and by the real-time light spot image of camera acquisition sliding block sample and lower fixed block, to obtain the change of interface actual contact state
Change situation, and then calculate the dynamic shear stiffness of contact interface, it is not high and can not to solve traditional shear stiffness measurement accuracy
The problems such as realizing real-time measurement.
According to one embodiment of present invention, as shown in Figure 4 and Figure 6, normal pressure component 112 include: U-shaped briquetting 24,
Groups of springs 26, normal direction loading bench 32,27, two sliding blocks 25 and 34 of lower lock block, two guide rails 28 and 33, two baffles 12 and 23,
Wherein, U-shaped briquetting 24, groups of springs 26 and lower lock block 27 are distributed from top to bottom, and two guide rails 28 and 33 are separately fixed at two gears
On the side of plate 12 and 23, the top edge of two baffles 12 and 23 is fixedly connected on the bottom surface of the upper mounting plate 5 of stiffness measurement system,
Lower lock block 27 is fixedly connected with U-shaped briquetting 24 by groups of springs 26；U-shaped briquetting 24 is connect with lower fixed block 18, and U-shaped pressure
24 two sides of block are bolted to connection with sliding block 25 and 34；Sliding block 25 and 34, it is upper in the mobile space that guide rail is formed to glide
It is dynamic；Normal direction loading bench 32 is fixedly connected on the top surface of the lower platform 1 of stiffness measurement system, provides method for normal pressure component and carries
Lotus.
According to one embodiment of present invention, as shown in Figure 4 and Figure 6, normal pressure detection components 111, comprising: disc type
Sensor 29 and pinboard 30, wherein the top surface of normal direction loading bench 32 is bolted with pinboard 30；Disc type sensor
29 bottom surface is bolted to connection with pinboard 30, and top surface and the lower lock block 27 of disc type sensor 29 are bolted
Connection.
According to one embodiment of present invention, as shown in fig. 7, tangential pressure component 112, comprising: pedestal 9, tangential load
Electric cylinder 10, linear bearing 13, bearing base 14 and push rod 15, wherein the bottom of pedestal 9 and the upper mounting plate 5 of stiffness measurement system
Face is fixedly connected；Tangential load electric cylinder 10, is bolted to connection with pedestal 9；Linear bearing 13, it is solid with bearing base 14
Fixed connection, also, bearing base 14 is fixedly connected with the bottom surface of the upper mounting plate 5 of stiffness measurement system；Push rod 15 is stuck in linear axis
It holds in 13, is fixedly connected with sliding block sample 17；The side of sliding block sample 17 is fixedly connected with push rod 15 by seccotine.
According to one embodiment of present invention, as shown in fig. 7, tangential pressure detection components 111, comprising: S type sensor
11, wherein S type sensor 11 is fixedly connected with push rod 15 and tangential load electric cylinder 10.
According to one embodiment of present invention, as shown in Fig. 2, Fig. 4, Fig. 8 and Fig. 9, Optical Fibre Displacement Measuring Unit 131, packet
It includes: 6, two optical fiber adjusting bracket 19, fiber optics displacement Mersure Controler fibre-optical probes 21 and 22, wherein optical fiber adjusting bracket 19, and it is rigid
The bottom surface for spending the upper mounting plate 5 of measuring system is fixedly connected；Two fibre-optical probes 21 and 22, are fixed at optical fiber adjusting bracket 19
On, two fibre-optical probes 21 and 22 are connect by optical fiber with fiber optics displacement controller 6, wherein in two fibre-optical probes 21 and 22
Each fibre-optical probe be fixedly connected with optical fiber adjusting bracket 19.
According to one embodiment of present invention, as shown in Fig. 2, Fig. 3, Fig. 5, Figure 10 and Figure 11, video image acquisition device
130, comprising: fiber coupler 7, laser controller 8, computer 22, camera 31, front surface mirror 35, linear slit 36, angle
Spend adjusting bracket 37 and laser aligner 38, wherein laser controller 8 is connect with fiber coupler 7 by data line；Laser quasi
Straight device 38, is connect with fiber coupler 7 by optical fiber；Laser aligner 38 is bolted to connection with angular adjustment frame 37；
Front surface transmitting mirror 35 is fixed on the upper mounting plate 5 of stiffness measurement system by seccotine, close to the side of lower fixed block 18；
Camera 31 is fixed on slide block device front upper place position by tripod, and is connect by data line with computer 22, by computer
22 control video image acquisitions.
According to one embodiment of present invention, as shown in figure 4, stiffness measurement system further include: signal sampler 4, wherein
Signal sampler 4 is communicated with Optical Fibre Displacement Measuring Unit 131, normal pressure detection components 111 and tangential pressure detection components 114
Connection.
For example, as a specific example, the workflow of stiffness measurement system is as follows:
Apply 100N normal force by self-level(l)ing normal direction loading device 100, slide block device 120 forms contact interface；It is pushing away
Seccotine is uniformly smeared in 15 front end of bar, is released forward by 110 driving push rod 15 of linear drives force loading device, to sliding block sample
17 apply the tangential force of 5N-15N, wait 5min to complete push rod 15 and are connected with sliding block 25.8 power of laser controller is set, is adjusted
38 angle of laser lens, and position and the focal length of camera 31 are adjusted, realize preferable imaging effect；Optical fiber adjusting bracket 19 is adjusted,
Ensure that fibre-optical probe 20 and 21 is in the adjacent two o'clock position in two contact interface sides；Added after completing debugging by linear driving force
Carry set 110 and self-level(l)ing normal direction loading device 100 unload respectively.
Further, power on, certain normal force applied to sliding block 25 by self-level(l)ing normal direction loading device 100,
It is set and is moved back and forth by linear drives force loading device 110, driving sliding block sample 17 adds unloading repeatedly.It is surveyed by fiber optics displacement
Device 131, disc type sensor 29, S type sensor 11 and signal sampler 4 are measured, is realized to experimentation median surface contact force
It is measured with the dynamic of interface relative displacement.Light spot image is generated in contact interface using video image acquisition device 130, utilizes phase
Machine 31 is acquired the light spot image of the contact condition of contact interface, realizes and sees to the dynamic of contact interface actual contact state
It surveys.
Stiffness measurement system according to the present invention carries the application of slide block device contact interface by self-level(l)ing normal direction device
Normal direction contact force, it is ensured that interfacial contact is uniform, and the push rod of linear drives force loading device and sliding block are connected, and drives electric cylinder list
To mobile or reciprocating motion, and the quasi-static shear stiffness of contact interface or dynamic shear stiffness are measured；Pass through video figure
As acquisition device, interface actual contact state change is acquired during the experiment in real time, solves traditional shear stiffness and survey
Amount has a single function, precision is not high, can not consider the problems such as contact condition variation carries out real time dynamic measurement.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
Claims (9)
1. a kind of stiffness measurement system characterized by comprising self-level(l)ing normal direction loading device, linear drives force loading device,
Slide block device, Optical Fibre Displacement Measuring Unit and video image acquisition device, wherein slide block device includes: upper fixation from top to bottom
Block, sliding block sample and lower fixed block, wherein self-level(l)ing normal direction loading device, including normal pressure detection components and normal pressure
Component, normal pressure component are connect with lower fixed block, wherein linear drives force loading device includes tangential pressure component and tangential
Pressure detecting assembly, tangential pressure component are fixedly connected with the side of sliding block sample, wherein
The self-level(l)ing normal direction loading device, for providing normal direction pressure by the normal pressure component for the slide block device
Power, and normal direction pressure value is detected by the normal pressure detection components；
The linear drives force loading device, for providing tangential force by the tangential pressure component for the sliding block sample,
And tangential pressure value is detected by the tangential pressure detection components；
The slide block device is used under the self-level(l)ing normal direction loading device and linear drives force loading device effect,
So that the sliding block sample and the upper fixing block and the lower fixed block are respectively formed contact interface；
The Optical Fibre Displacement Measuring Unit, for acquiring the interface relative displacement between the sliding block sample and the lower fixed block；
The video image acquisition device forms light on the contact interface between the sliding block sample and the lower fixed block
Spot image, and acquire by camera the real-time light spot image of the sliding block sample Yu the lower fixed block.
2. the system as claimed in claim 1, which is characterized in that the normal pressure component include: U-shaped briquetting, groups of springs, under
Briquetting, two sliding blocks, two guide rails and two baffles,
Wherein, the U-shaped briquetting, the groups of springs and the lower lock block are distributed from top to bottom, the top edge of described two baffles
It is fixedly connected on the bottom surface of the upper mounting plate of the stiffness measurement system, described two guide rails are separately fixed at described two baffles
On side；
The lower lock block is fixedly connected with the U-shaped briquetting by groups of springs；
The U-shaped briquetting is bolted to connection with the lower fixed block, and the U-shaped briquetting two sides and the sliding block
It is bolted to connection；
The sliding block slides up and down in the mobile space that the guide rail is formed.
3. system as claimed in claim 2, which is characterized in that the normal pressure detection components, comprising: disc type sensing
Device, pinboard and normal direction loading bench, wherein
The normal direction loading bench is fixedly connected on the top surface of the lower platform of the stiffness measurement system, the normal direction loading bench
Top surface is bolted with the pinboard；
The bottom surface of the disc type sensor is bolted to connection with the pinboard, the top surface of the disc type sensor
It is bolted to connection with the lower lock block.
4. the system as claimed in claim 1, which is characterized in that the tangential pressure component, comprising: pedestal, tangential load electricity
Dynamic cylinder, linear bearing, bearing base and push rod, wherein the bottom surface of the pedestal and the upper mounting plate of the stiffness measurement system is solid
Fixed connection；
The tangential load electric cylinder, is bolted to connection with the pedestal；
The linear bearing is fixedly connected with the bearing base, also, the bearing base and the stiffness measurement system
The bottom surface of upper mounting plate is fixedly connected；
The push rod is stuck in the linear bearing, is fixedly connected with the sliding block sample.
5. system as claimed in claim 4, which is characterized in that the tangential pressure detection components, comprising: S type sensor,
In,
The S type sensor, with the push rod and the tangential load electric cylinder by being fixedly connected.
6. system as claimed in claim 5, which is characterized in that the side of the sliding block sample and the push rod pass through seccotine
It is fixedly connected.
7. the system as claimed in claim 1, which is characterized in that the Optical Fibre Displacement Measuring Unit, comprising: optical fiber adjusting bracket,
Fiber optics displacement computation module, two fibre-optical probes, wherein
The optical fiber adjusting bracket is fixedly connected with the bottom surface of the upper mounting plate of the stiffness measurement system；
Described two fibre-optical probes are fixed on the optical fiber adjusting bracket, and described two fibre-optical probes pass through optical fiber and institute
State the connection of fiber optics displacement computation module.
8. system as claimed in claim 7, which is characterized in that the video image acquisition device, comprising: fiber coupler,
Laser controller, computer, camera, front surface mirror, linear slit, angular adjustment frame and laser aligner, wherein
The laser controller is connect with the fiber coupler by data line；
The laser aligner is connect with the fiber coupler by optical fiber；
The laser aligner is bolted to connection with the angular adjustment frame；
The front surface mirror is fixed on the upper mounting plate of the stiffness measurement system by seccotine, close to described lower solid
Determine the side of block；
The camera is fixed on slide block device front upper place position by tripod, and passes through data line and the computer
Connection controls video image acquisition by the computer.
9. the system as claimed in claim 1, which is characterized in that further include: signal sampler, wherein the signal sampler
It is communicated to connect with the fiber optics displacement computation module, the normal pressure detection components and the tangential pressure detection components.
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| CN201910646654.4A CN110285940A (en) | 2019-07-17 | 2019-07-17 | Stiffness measurement system |
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| CN201910646654.4A CN110285940A (en) | 2019-07-17 | 2019-07-17 | Stiffness measurement system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112161765A (en) * | 2020-09-01 | 2021-01-01 | 大连理工大学 | Contact interface tangential rigidity testing device under cyclic load based on piezoelectric actuator |
| CN112518802A (en) * | 2020-11-26 | 2021-03-19 | 上海航天设备制造总厂有限公司 | High-precision device for robot rigidity measurement |
| CN117740343A (en) * | 2023-11-24 | 2024-03-22 | 北京精雕科技集团有限公司 | Device and method for measuring tangential stiffness of joint of sliding part |
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| CN112518802A (en) * | 2020-11-26 | 2021-03-19 | 上海航天设备制造总厂有限公司 | High-precision device for robot rigidity measurement |
| CN117740343A (en) * | 2023-11-24 | 2024-03-22 | 北京精雕科技集团有限公司 | Device and method for measuring tangential stiffness of joint of sliding part |
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Application publication date: 20190927 |