CN112747881B - Friction coupling vibration experiment table and measuring method thereof - Google Patents
Friction coupling vibration experiment table and measuring method thereof Download PDFInfo
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- CN112747881B CN112747881B CN202011595874.8A CN202011595874A CN112747881B CN 112747881 B CN112747881 B CN 112747881B CN 202011595874 A CN202011595874 A CN 202011595874A CN 112747881 B CN112747881 B CN 112747881B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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Abstract
The invention relates to a friction coupling vibration experiment table, which comprises a rack, a driving device, a vibration device and a measuring device, wherein the driving device comprises a motor, a driving shaft and a disc, the disc is horizontally arranged, and the motor is in transmission connection with the circle center of the disc through the driving shaft; the rack comprises a cross beam and vertical rods, the cross beam is horizontally arranged, the two vertical rods are vertically arranged at intervals, and the upper ends of the two vertical rods are respectively fixedly connected with the cross beam; the vibration device comprises a slide rail, a slide block, a transverse guide rod, a mass block, a friction seat, a spring, an elastic sheet and a mass block; the measuring device comprises fiber gratings, a demodulator and a processor, wherein the two side surfaces of each elastic sheet are symmetrically provided with the fiber gratings. According to the friction coupling vibration experiment table and the measurement method thereof, the motor drives the disc to rotate so as to simulate sliding friction with the friction seat, the transverse vibration in the friction force direction causes vertical vibration, and the mass block is driven to vibrate in the horizontal direction and the vertical direction, so that the vibration condition under the two-degree-of-freedom condition can be researched.
Description
Technical Field
The invention relates to the technical field of friction coupling vibration, in particular to a friction coupling vibration experiment table and a measurement method thereof.
Background
The frictional self-excited vibration is an unstable vibration occurring on the surfaces of two opposing sliding objects, which is a nonlinear vibration caused by friction between the objects. In the daily life and engineering fields, the phenomenon of friction self-excited vibration widely exists. This phenomenon causes various forms of waves and oscillations of the objects in contact with each other, which increases the wear of the mechanical parts and generates intolerable noise, with various negative effects on the engineering production and daily life. Therefore, the system research on the friction self-excited vibration has great practical and theoretical value.
Recently, the modal coupling theory is considered as an important mechanism for generating friction self-excited vibration, it is considered that in a two-degree-of-freedom system, there are structural and friction coupling, the transverse vibration in the direction of friction force causes vertical vibration, when the friction coefficient is greater than a critical value, there is a difference between the vibration phases in the transverse direction and the vertical direction, and the vibration frequencies are gradually combined, so that coupling occurs, at this time, the work input into the system by the friction force is greater than the work output from the system, and the system generates friction coupling vibration. For the experimental study of friction coupling vibration, most of the existing experimental devices adopt a conveyor belt and a linearly moving workbench as driving devices for exciting vibration, wherein the rigidity of the conveyor belt is low, the conveying stability is poor, the stroke of the workbench is short, and the vibration phenomenon is inconvenient to continuously study. In addition, most of the existing experimental devices are single-degree-of-freedom systems, only have vibration in a single direction, and the friction coupling vibration system with two degrees of freedom cannot be researched.
Disclosure of Invention
In view of this, it is necessary to provide a friction coupling vibration experiment table and a measurement method thereof, so as to solve the technical problem that in the prior art, the experiment apparatus is a single-degree-of-freedom system, and only has single-direction vibration, and cannot study a two-degree-of-freedom friction coupling vibration system.
The invention provides a friction coupling vibration experiment table, which comprises: the device comprises a rack, a driving device, a vibrating device and a measuring device, wherein the driving device comprises a motor, a driving shaft and a disc, the disc is horizontally arranged, and the motor is in transmission connection with the circle center of the disc through the driving shaft and can drive the disc to rotate on the horizontal plane; the frame comprises a cross beam and vertical rods, the cross beam is horizontally arranged, the two vertical rods are vertically arranged at intervals, and the upper ends of the two vertical rods are respectively fixedly connected with the cross beam; the vibrating device comprises slide rails, slide blocks, transverse guide rods, mass blocks, a friction seat, a spring, elastic sheets and object blocks, wherein the slide rails are vertically arranged on the side surface of each vertical rod facing to the other vertical rod, the two slide blocks are respectively in one-to-one corresponding sliding connection with the two slide rails, one end of each transverse guide rod is fixedly connected with one slide block, the other end of each transverse guide rod is fixedly connected with the other slide block through a first elastic sheet, the mass blocks are sleeved on the transverse guide rods and can slide along the transverse guide rods, the first spring is sleeved on the transverse guide rods, one end of each transverse guide rod is abutted against the mass block, the other end of each transverse guide rod is abutted against the first elastic sheet, the second spring is vertically arranged, the mass blocks are fixedly connected at the upper ends of the transverse guide rods, the friction seat is abutted against the upper surface of a disc, the second elastic sheets and the third spring are all obliquely arranged, the upper ends of the second elastic sheets are fixedly connected with a cross beam, the lower ends of the second elastic sheets are fixedly connected with the upper ends of the third springs, the lower ends of the third springs are fixedly connected with the mass blocks, the third elastic sheets are vertically arranged, the lower ends of the third elastic sheets are fixedly connected with the first object blocks, the fourth elastic sheets, one ends of the fourth elastic sheets are horizontally arranged, one ends of the second elastic sheets are fixedly connected with the second elastic sheets, and the second elastic sheets, one ends of the second elastic sheets, and the second elastic sheets are fixedly connected with the second elastic sheets; the measuring device comprises a fiber grating, a demodulator and a processor, wherein the fiber grating is symmetrically arranged on two side faces of the first elastic sheet, the second elastic sheet, the third elastic sheet and the fourth elastic sheet, the demodulator is respectively connected with electrical signals of the fiber grating, the processor is connected with the electrical signals of the demodulator, each fiber grating generates wavelength signals, the wavelength signals are transmitted to the demodulator, and the wavelength signals are transmitted to the processor for processing and calculation after being demodulated by the demodulator.
Further, the frame still includes bottom plate and adjustment stabilizer blade, and the bottom plate sets up on four adjustment stabilizer blades, and the adjustment stabilizer blade can be followed vertical direction and stretched out and drawn back to the levelness of adjustment bottom plate, drive arrangement sets up on the bottom plate.
Furthermore, the driving device further comprises a speed reducer and a coupler, a transmission shaft of the motor is connected with the input end of the speed reducer, and the output end of the speed reducer is connected with the lower end of the driver through the coupler.
Furthermore, the driving device further comprises a supporting seat fixedly arranged on the bottom plate, and the motor and the speed reducer are respectively and fixedly connected with the supporting seat.
Furthermore, the vibration device further comprises a vertical guide rod, the vertical guide rod is vertically arranged, the lower end of the vertical guide rod is fixedly connected with the friction seat, the upper end of the vertical guide rod penetrates through the mass block, and the mass block is connected with the vertical guide rod in a sliding mode.
Further, vibrating device still includes the fixed block, horizontal guide arm can be dismantled with slider or first shell fragment through the fixed block and be connected, the fixed block includes the main part, the fastening ear, fastening bolt and connecting bolt, the main part is the C type and has elasticity, its middle part forms and is used for horizontal guide arm to pass accommodation space, two fastening ears set up relatively and be connected with main part both ends integrated into one piece respectively, it is equipped with the fastening screw hole to open relatively on two fastening ears respectively, fastening bolt is connected with the cooperation of fastening screw hole, shorten the distance between two fastening ears, thereby make the main part take place to deform and press from both sides tight horizontal guide bar, connecting screw hole has been seted up on the main part, connecting bolt can dismantle with slider or first shell fragment through connecting screw hole and be connected.
Furthermore, the first spring, the second spring, the third spring, the first elastic sheet, the second elastic sheet, the third elastic sheet and the fourth elastic sheet are positioned on the same plane.
Furthermore, the number of the transverse guide rods is two, the transverse guide rods are arranged in parallel up and down, and the first spring is sleeved on the transverse guide rod below the transverse guide rods.
The invention also provides a measuring method of the friction coupling vibration experiment table, which comprises the following steps: s1, respectively carrying out calibration experiments on each fiber bragg grating to obtain a strain calibration equation; s2, numbering each fiber bragg grating and connecting the fiber bragg gratings with a demodulator; s3, starting a motor to enable the mass block to generate friction coupling vibration; s4, coupling vibration is generated by each elastic sheet along with the mass block, the wavelength of each fiber bragg grating is changed, and signals are transmitted to the demodulator; and S5, the demodulator acquires the fiber bragg grating signal, demodulates the fiber bragg grating signal and transmits the fiber bragg grating signal to the processor, and the processor calculates the elastic force and acceleration data of the elastic sheet according to the demodulated wavelength change signal.
Further, the method also comprises the step S6 of changing the spring elastic coefficient or the mass of the mass block, and the steps S3 to S5 are repeated, so that the influence of the spring elastic coefficient or the mass of the mass block on the friction coupling vibration is researched.
Compared with the prior art, the friction coupling vibration experiment table and the measurement method thereof drive the disc to rotate through the motor to simulate sliding friction with the friction seat, the transverse vibration in the friction force direction causes vertical vibration to drive the mass block to vibrate in the horizontal direction and the vertical direction, so that the vibration condition under the two-degree-of-freedom condition can be studied, the elastic force and the acceleration of the elastic sheet are measured according to the characteristic that the wavelength of the fiber bragg grating can change during vibration, and more accurate quantitative study is carried out on the friction coupling vibration.
Drawings
FIG. 1 is a schematic structural diagram of a friction coupling vibration experiment table provided by the present invention;
FIG. 2 is a front view of the drive of FIG. 1;
FIG. 3 is a front view of the vibration apparatus of FIG. 1;
FIG. 4 is an enlarged view of a portion of FIG. 3;
FIG. 5 is a schematic structural view of the fixing block of FIG. 1;
FIG. 6 is a schematic signal connection diagram of the friction coupling vibration experiment table provided by the present invention;
FIG. 7 is a flow chart of the measurement method of the friction coupling vibration experiment table.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
Referring to fig. 1 to 6, the friction coupling vibration experiment table includes a frame 1, a driving device 2, a vibration device 3, and a measuring device 4, the driving device 2 and the vibration device 3 are disposed on the frame 1, the driving device 2 can drive the vibration device 3 to vibrate, and the measuring device 4 is used to measure the vibration of the vibration device, so that the experimenter can study the vibration.
The frame 1 comprises an adjusting leg 11, a bottom plate 12, a supporting column 13, a cross beam 14 and a vertical rod 15. The bottom plate 12 is arranged on the four adjusting support legs 11, and the adjusting support legs 11 can stretch along the vertical direction, so that the levelness of the bottom plate 12 is adjusted. Support columns 13 are provided on the base plate 12 for supporting the horizontal beams 14. Two vertical rods 15 which are parallel at intervals are arranged below the cross beam 14, and the upper ends of the vertical rods 15 are fixedly connected with the cross beam 14.
The driving device 2 is disposed on the base plate 12, and includes a support base 21, a motor 22, a speed reducer 23, a coupling 24, a driving shaft 25, and a disk 26. Supporting seat 21 is fixed to be set up on bottom plate 2, motor 22 and reduction gear 23 respectively with supporting seat 21 fixed connection, motor 22's transmission shaft is vertical upwards, connect reduction gear 23's input, reduction gear 23's output passes through the lower extreme that shaft coupling 24 connects drive shaft 25, the centre of a circle of disc 26 is connected to the upper end of drive shaft 25, disc 26 level sets up, after motor 22 slowed down through reduction gear 23, can drive disc 26 through drive shaft 25 and rotate on the horizontal plane with an appropriate speed.
The vibration device 3 includes a slide rail 31, a slide block 32, a transverse guide rod 33, a mass block 34, a vertical guide rod 35, a friction seat 36, a first spring 37A, a second spring 37B, a third spring 37C, a first elastic sheet 38A, a second elastic sheet 38B, a third elastic sheet 38C, a fourth elastic sheet 38D, a fixed block 39 and the mass block 30.
All vertically set up slide rail 31 on every montant 15 towards the side of another montant 15, two sliders 32 respectively with two slide rail 31 one-to-one sliding connection, can slide from top to bottom along slide rail 31 under the effect of external force. One end of the transverse guide rod 33 is fixedly connected with one of the sliders 32, the other end of the transverse guide rod 33 is fixedly connected with the other slider 32 through a first elastic sheet 38A, and the mass block 34 is sleeved on the transverse guide rod 33 and can slide along the transverse guide rod 33. The first spring 37A is sleeved on the transverse guide rod 33, and one end thereof abuts against the mass block 34, and the other end thereof abuts against the first elastic sheet 38A. In this embodiment, two transverse guide rods 33 are provided, and are arranged in parallel up and down, and the first spring 37A is only sleeved on the lower transverse guide rod 33.
The second spring 37B is vertically disposed, and has an upper end fixedly connected to the mass block 34 and a lower end fixedly connected to the friction seat 36, and the friction seat 36 is disposed on the disk 26 and abuts against the upper surface of the disk 36. In this embodiment, in order to ensure that the lateral vibration of the mass 34 does not occur on the second spring 37, two vertical guide rods 35 are further fixedly arranged on the friction seat 36, the upper ends of the vertical guide rods 35 penetrate through the mass 34, and the mass 34 can slide up and down relative to the vertical guide rods 35.
The second elastic sheet 38B and the third spring 37C are both obliquely arranged, the upper end of the second elastic sheet 38B is fixedly connected with the cross beam 14, the lower end of the second elastic sheet 38B is fixedly connected with the upper end of the third spring 37C, the second elastic sheet 38B is perpendicular to the third spring 37C, and the lower end of the third spring 37C is fixedly connected with the mass block 34. Suitably, the mass 34 has a slope formed thereon, and the third spring 37C is perpendicular to the slope. In the experiment, the influence of the inclination angle of the third spring 37C on the friction coupling vibration can be studied by changing the included angle between the second elastic sheet 38B and the third spring 37C. The third elastic sheet 38C is vertically arranged, the lower end of the third elastic sheet 38C is fixedly connected with the mass block 34, and the upper end is fixedly connected with the first mass block 30A. The fourth resilient piece 38D is horizontally disposed, and one end of the fourth resilient piece 38D close to the first resilient piece 38A is fixedly connected to the mass block 34, and one end of the fourth resilient piece 38D far away from the first resilient piece 38A is fixedly connected to the second mass block 30B. And the first spring 37A, the second spring 37B, the third spring 37C, the first elastic sheet 38A, the second elastic sheet 38B, the third elastic sheet 38C and the fourth elastic sheet 39D are all located on the same plane, so that the vibration is controlled on two degrees of freedom.
In this embodiment, two ends of the transverse guide rod 33 are detachably connected to the first elastic piece 38A or the sliding block 32 through the fixing block 39. The fixing block 39 includes a body portion 391, a fastening lug 392, a fastening bolt 393, and a connecting bolt 394. The main body portion 391 is C-shaped and has elasticity, a middle portion of the main body portion is formed for the transverse guide rod 33 to pass through the accommodating space, the two fastening lugs 392 are oppositely arranged and are respectively connected with two ends of the main body portion 391 in an integrated forming mode, and fastening threaded holes are respectively formed in the two fastening lugs 392 in an opposite mode. The fastening bolt 393 is engaged with the fastening screw hole to shorten the distance between the two fastening ears 392, so that the body portion 391 is deformed to clamp the lateral guide rod 33. The main body portion 391 is provided with a connection threaded hole, and the direction of the connection threaded hole is perpendicular to the direction of the fastening threaded hole. The connecting bolt 394 is detachably connected with the slider 32 or the first resilient piece 38A through the connecting threaded hole.
The measuring device 4 comprises a fiber grating 41, a demodulator 42 and a processor 43, the two side faces of the first elastic sheet 38A, the second elastic sheet 38B, the third elastic sheet 38C and the fourth elastic sheet 38D are symmetrically provided with the fiber grating 41, and the fiber grating 41 is packaged by epoxy resin AB glue. The demodulators 42 are electrically connected to the respective fiber gratings 41, and the processor 43 is electrically connected to the demodulator 42. In this embodiment, the processor 43 may be a conventional computer and is equipped with a special signal processing software to perform the calculation. The wavelength signals generated by the fiber gratings 41 are transmitted to the demodulator 42, demodulated by the demodulator 42 and transmitted to the processor 43 for processing and calculation, so as to obtain the measurement values of the vibration and the elastic force of the elastic sheet at any time. .
The measuring principle of the test bed is as follows: when an incident light beam is transmitted in the fiber grating 41, if the phases of the light beam entering the grating region and the fiber grating 41 are matched, the light beam is reflected back to form a reflected light beam with the same phase, and the unmatched light beam is transmitted out to form a transmitted light beam with disordered phase. The central wavelength of the reflected light is influenced by the external signal, and is sensitive to temperature and strain. The wavelength variation can be expressed as:
Δλ B ＝K ε Δε+K T ΔT
wherein, K ε 、K T The strain and temperature sensitivity coefficients of the fiber grating are respectively, delta epsilon and delta T are the strain and temperature change of the fiber grating, the external strain or temperature change can be measured by utilizing the characteristics, and in the actual measurement, the wavelength change caused by the strain and temperature change needs to be distinguished, namely the cross sensitivity.
In order to eliminate the temperature influence, the fiber gratings are symmetrically adhered to the front surface and the back surface, two fiber gratings at the same position are influenced by the same boundary temperature change and are influenced by the opposite strain change, and then the wavelength changes of the two fiber gratings can be expressed as:
Δλ B1 ＝K ε1 Δε+K r ΔT
Δλ B2 ＝-K ε2 Δε+K T ΔT
the method is characterized by comprising the following steps:
Δλ B1 -Δλ B2 ＝(K ε1 +K ε2 )Δε
let Delta lambda B1 -Δλ B2 ＝Δλ B ，K ε1 +K ε2 ＝K ε Then the above formula can be expressed as
Δλ B ＝K ε Δε
Thus, the influence of temperature is eliminated, and the influence of strain is highlighted.
Referring to fig. 7, the measuring method of the friction coupling vibration experiment table comprises the following steps.
S1, respectively carrying out calibration experiments on each fiber bragg grating 41, applying a group of forces to the movable end of each elastic steel sheet (38A, 38B, 38C and 38D), recording the wavelength variation of the fiber bragg grating 41, and measuring out a strain sensitivity coefficient so as to obtain a calibration equation of the forces and the wavelength variation.
And S2, numbering each fiber grating 41 and connecting the fiber grating into each channel of the demodulator 42.
S3, setting the rotating speed of the motor 22, measuring the distance between the transverse guide rod 33 and the center of the disc 26, operating the friction coupling vibration experiment table, enabling the disc 26 to start to move at a certain rotating speed, and enabling the mass block 34 to be subjected to friction and elastic force of each spring and to generate coupling vibration vertically and transversely under the guiding action of the transverse guide rod 33, the vertical guide rod 35, the sliding rail 31 and the sliding block 32.
S4, as the mass block 34 is subjected to coupling vibration, the mass blocks (30A and 30B) bend the elastic steel sheets (38C and 38D) under stress to generate strain in the vibration process of the mass block 34, so that the wavelength of the fiber grating 41 is changed. Meanwhile, the movable ends of the first elastic sheet 38A and the second elastic sheet 38B are respectively subjected to the alternating elastic force of the first spring 37A and the third spring 37C to generate strain, so that the wavelength of the fiber grating 41 is changed. Each fiber grating 41 transmits the wavelength signal to the demodulator 42 in real time.
S5, the demodulator 42 collects the fiber bragg grating 41 signals in the friction coupling vibration process, demodulates and transmits the signals to the processor 43, and signal collection software of the processor collects the demodulated signals in real time and stores the demodulated signals in the processor, so that the same measured value of each measuring point can be obtained, and simultaneous measurement is realized. For the measurement of vibration, the transverse and vertical stress magnitudes are respectively calculated according to a calibration equation and the transverse and vertical acceleration magnitudes are respectively calculated according to the Newton's second law through the data of the fiber gratings 41 on the third elastic sheet 38C and the fourth elastic sheet 38D. For the measurement of the elastic force, the elastic force is calculated according to the calibration equation by the data of the fiber bragg gratings 41 on the first elastic sheet 38A and the second elastic sheet 38B.
S6, changing the experimental conditions of the friction coupling vibration experiment table, repeating the steps S3-S5, and researching the friction coupling motion state and characteristics under different conditions. Such as: the contact position of the friction seat 36 and the disc 26 is changed by adjusting the rotating speed of the motor 22 or adjusting the position of the supporting seat 21 arranged on the bottom plate 2, so that disc speeds at different contact positions are obtained, and the influence of the speeds of different discs 26 on friction coupling vibration is researched. By changing the spring constants of the first spring 37A, the second spring 37B, and the third spring 37C, the influence of different spring constants on the friction-coupled vibration was investigated. By varying the mass of mass 34, the effect of different masses 34 on the frictionally coupled vibrations was studied. By providing different inclinations of the third spring 37C, the influence of the inclination angle along the third spring 37C on the friction-coupled vibrations, etc.
The embodiment of the invention has the following beneficial effects: according to the friction coupling vibration experiment table and the measurement method thereof, the motor drives the disc to rotate to simulate sliding friction with the friction seat, the transverse vibration in the friction force direction causes vertical vibration, the mass block is driven to vibrate in the horizontal direction and the vertical direction, so that the vibration condition under the two-degree-of-freedom condition can be studied, the elastic force and the acceleration of the elastic sheet are measured according to the characteristic that the wavelength of the fiber bragg grating can change during vibration, and the friction coupling vibration is quantitatively studied more accurately.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. A friction coupling vibration experiment table, characterized in that, it includes: a frame, a driving device, a vibrating device and a measuring device,
the driving device comprises a motor, a driving shaft and a disc, the disc is horizontally arranged, and the motor is in transmission connection with the circle center of the disc through the driving shaft and can drive the disc to rotate on the horizontal plane;
the rack comprises a cross beam and vertical rods, the cross beam is horizontally arranged, the two vertical rods are vertically arranged at intervals, and the upper ends of the two vertical rods are respectively fixedly connected with the cross beam;
the vibration device comprises slide rails, slide blocks, transverse guide rods, mass blocks, friction seats, springs, elastic sheets and object blocks, wherein the slide rails are vertically arranged on the side surface of each vertical rod facing to the other vertical rod, the two slide blocks are respectively in one-to-one sliding connection with the two slide rails, one end of each transverse guide rod is fixedly connected with one slide block, the other end of each transverse guide rod is fixedly connected with the other slide block through a first elastic sheet, the mass blocks are sleeved on the transverse guide rods and can slide along the transverse guide rods, the first spring is sleeved on the transverse guide rods, one end of each transverse guide rod is abutted against the mass block, the other end of each transverse guide rod is abutted against the first elastic sheet, the second spring is vertically arranged, the upper ends of the mass blocks are fixedly connected with the friction seats, the friction seats are abutted against the upper surface of the disc, the second elastic sheets and the third springs are all obliquely arranged, the upper ends of the second elastic sheets are fixedly connected with the cross beams, the lower ends of the third springs are fixedly connected with the mass blocks, the lower ends of the third springs are fixedly connected with the elastic sheets, the second elastic sheets are fixedly connected with the elastic sheets, the elastic sheets are horizontally arranged, the second elastic sheets are connected with one ends of the elastic sheets, and one ends of the second elastic sheets are connected with the elastic sheets;
the measuring device comprises a fiber grating, a demodulator and a processor, wherein the fiber grating is symmetrically arranged on two side surfaces of the first elastic sheet, the second elastic sheet, the third elastic sheet and the fourth elastic sheet, the demodulator is respectively connected with the fiber grating through electric signals, the processor is connected with the demodulator through electric signals, and wavelength signals generated by the fiber grating are transmitted to the demodulator and then transmitted to the processor for processing and calculation after being demodulated by the demodulator.
2. The friction coupling vibration experiment table according to claim 1, wherein the frame further comprises a bottom plate and adjusting legs, the bottom plate is disposed on the four adjusting legs, the adjusting legs can be extended and retracted in a vertical direction to adjust the levelness of the bottom plate, and the driving device is disposed on the bottom plate.
3. The friction coupling vibration experiment table according to claim 2, wherein the driving device further comprises a speed reducer and a coupling, the transmission shaft of the motor is connected with the input end of the speed reducer, and the output end of the speed reducer is connected with the lower end of the driving shaft through the coupling.
4. The friction coupling vibration experiment table according to claim 3, wherein the driving device further comprises a supporting base fixedly disposed on the bottom plate, and the motor and the speed reducer are respectively and fixedly connected to the supporting base.
5. The friction coupling vibration experiment table according to claim 4, wherein the vibration device further comprises a vertical guide rod, the vertical guide rod is vertically arranged, the lower end of the vertical guide rod is fixedly connected with the friction seat, the upper end of the vertical guide rod penetrates through the mass block, and the mass block is connected with the vertical guide rod in a sliding manner.
6. The friction coupling vibration experiment table according to claim 5, wherein the vibration device further comprises a fixing block, the transverse guide rod is detachably connected with the sliding block or the first elastic sheet through the fixing block, the fixing block comprises a main body portion, fastening lugs, fastening bolts and connecting bolts, the main body portion is C-shaped and elastic, the middle portion of the fixing block is used for enabling the transverse guide rod to penetrate through an accommodating space, the two fastening lugs are oppositely arranged and are respectively connected with two ends of the main body portion in an integrated forming mode, fastening threaded holes are formed in the two fastening lugs respectively in a relatively opposite mode, the fastening bolts are connected with the fastening threaded holes in a matched mode, the distance between the two fastening lugs is shortened, the main body portion is deformed to clamp the transverse guide rod tightly, connecting threaded holes are formed in the main body portion, and the connecting bolts are detachably connected with the sliding block or the first elastic sheet through the connecting threaded holes.
7. The friction-coupled vibration experiment table according to claim 6, wherein the first spring, the second spring, the third spring, the first elastic sheet, the second elastic sheet, the third elastic sheet and the fourth elastic sheet are located on the same plane.
8. The friction coupling vibration experiment table according to claim 7, wherein the two transverse guide rods are arranged in parallel up and down, and the first spring is sleeved on the transverse guide rod below the two transverse guide rods.
9. A method of measuring a friction coupled vibration experiment table according to any of claims 1-8, comprising the steps of:
s1, respectively carrying out calibration experiments on the fiber gratings to obtain a strain calibration equation;
s2, numbering each fiber bragg grating and connecting the fiber bragg grating with the demodulator;
s3, starting the motor to enable the mass block to generate friction coupling vibration;
s4, each elastic sheet generates coupling vibration along with the mass block, the wavelength of each fiber bragg grating changes, and signals are transmitted to the demodulator;
and S5, the demodulator acquires the fiber bragg grating signal, demodulates the fiber bragg grating signal and transmits the fiber bragg grating signal to the processor, and the processor calculates the elastic force and acceleration data of the elastic sheet according to the demodulated wavelength change signal.
10. The measurement method of the friction coupling vibration experiment table according to claim 9, further comprising the step S6 of changing the spring rate or the mass of the mass, and repeating the steps S3 to S5, thereby studying the effect of the spring rate or the mass of the mass on the friction coupling vibration.
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