KR101686207B1 - Apparatus for measuring friction of vibrating structures - Google Patents

Apparatus for measuring friction of vibrating structures Download PDF

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Publication number
KR101686207B1
KR101686207B1 KR1020150056321A KR20150056321A KR101686207B1 KR 101686207 B1 KR101686207 B1 KR 101686207B1 KR 1020150056321 A KR1020150056321 A KR 1020150056321A KR 20150056321 A KR20150056321 A KR 20150056321A KR 101686207 B1 KR101686207 B1 KR 101686207B1
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KR
South Korea
Prior art keywords
test piece
main body
load cell
moving
vibration
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KR1020150056321A
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Korean (ko)
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KR20160125645A (en
Inventor
김도년
이헌용
도영경
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서울대학교산학협력단
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Priority to KR1020150056321A priority Critical patent/KR101686207B1/en
Priority to PCT/KR2016/002385 priority patent/WO2016171391A1/en
Publication of KR20160125645A publication Critical patent/KR20160125645A/en
Application granted granted Critical
Publication of KR101686207B1 publication Critical patent/KR101686207B1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/0028—Force sensors associated with force applying means
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00—Investigating materials by mechanical methods
    • G01N19/02—Measuring coefficient of friction between materials

Abstract

An apparatus for measuring friction of a vibrating structure according to an embodiment of the present invention includes: a body having a movable rail at an upper portion thereof and a floor rail at a lower floor; A drive unit provided at one end of the main body; A pulley provided at a side of the main body opposite to the driving device; A power transmitting member connecting the drive unit and the pulley; And a moving cart connected to the power transmitting member and moving along a moving rail of the main body; .

Figure R1020150056321

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus for measuring friction of an oscillating structure,

The present invention relates to a method of measuring vibration of a specimen having various shapes, slenderness ratio, material properties, and bottom surface by applying vibration to a specimen to induce inherent vibration characteristics of the specimen and measuring the change in frictional force under various load and moving speed conditions And more particularly, to a friction measuring device for a structure.

In order to investigate the relationship between friction and vibration in industrial and academic fields, a rotary type friction measuring device using a turntable mainly using a minute test piece is used. However, in the conventional rotary type friction measuring device, there is a problem that a curvature effect according to the equipment radius and a measurement error due to the centrifugal force generated during rotation occur, and it is impossible to test a test piece having a relatively large contact surface.

As an example, Korean Patent Registration No. 0691522 discloses a "friction coefficient measuring apparatus ".

In order to solve the above-mentioned problems, the embodiment of the present invention confirms the change of the frictional force when vibration is applied to the test piece on which friction occurs, and the frictional force or frictional force according to different vibration characteristics such as frequency and amplitude, And to provide a friction measuring device for an oscillating structure capable of acquiring coefficient data.

According to an aspect of the present invention, there is provided an apparatus for measuring a friction of a vibrating structure, including: a body having a moving rail at an upper portion thereof and a floor rail at a lower floor; A drive unit provided at one end of the main body; A pulley provided at a side of the main body opposite to the driving device; A power transmitting member connecting the drive unit and the pulley; And a moving cart connected to the power transmitting member and moving along a moving rail of the main body; . ≪ / RTI >

Further, the power transmitting member may be a timing belt.

The moving cart may include a moving frame that is connected to the power transmitting member and is positioned on a moving rail of the main body and moves along a moving rail of the main body; And an upper end connected to the moving frame, the upper end of the moving frame passing through the moving frame and the lower end passing through the moving frame and facing the bottom rail of the main body; . ≪ / RTI >

In addition, a test piece may be attached to the lower portion of the central shaft, and the test piece may move along the bottom surface rail of the main body while closely contacting the bottom surface rail of the main body.

In addition, a vibrator may be provided on the central axis.

Further, the vibrator may be a pneumatic vibrator or a vibration motor operated by a compressor.

Further, the driving device and the vibrator can be controlled by the control box.

In addition, a load cell may be provided between the center axis and the test piece.

Also, the load cell may be a multi-axis load cell.

The load cell may include a vertical load cell disposed under the central axis in the same vertical direction as the central axis; And a horizontal load cell installed in a horizontal direction perpendicular to the vertical load cell; . ≪ / RTI >

In addition, a compression spring is inserted into the center shaft, and the compression spring can be positioned between the bottom of the moving frame and the vertical load cell.

In addition, a pressure plate is attached to the center shaft, and the pressure plate is installed above the moving frame with an interval therebetween, and is screwed to the moving frame by a press bolt. When the press bolt is tightened, The center shaft connected to the presser plate is lowered and the compression spring is compressed to apply a load to the test piece.

In addition, the vibrator may apply vibration to the test piece under the central axis to induce the inherent vibration characteristics of the test piece.

In addition, the vibration characteristic may be any one of a frequency, an amplitude, and a vibration mode, or a combination of these data.

Also, the data measured in the load cell can be transmitted to the PC via the control box and the DAQ.

In addition, a speed sensing sensor is provided on one side of the main body, and when the moving cart passes the speed sensing sensor installation section, a control box receiving a signal from the speed sensing sensor stops the driving device to stop the moving cart .

Further, the load cell may measure the frictional force or the normal force of the test piece.

In addition, a detection sensor may be attached to the test piece.

In addition, the sensing sensor may be an acceleration sensor or a strain gauge.

In addition, the acceleration sensor may be attached to each position of the set test specimen, and when the test specimen moves along the bottom rail, a frequency, an amplitude, and a sliding speed may be measured according to the length of the test specimen.

In addition, the strain gauge may be attached to each position of the set specimen to measure the stress distribution at each position of the specimen.

In addition, a high-speed camera for photographing vibration characteristics of the test piece may be provided on one side of the main body.

In addition, the test piece may be skis or skates.

Further, the driving device may be a motor.

According to the apparatus for measuring friction of a vibrating structure according to the embodiment of the present invention, when a vibration is applied to a test piece on which friction occurs, the change of the friction force is checked and various vibration characteristics such as frequency and amplitude, Frictional force or friction coefficient data can be obtained.

It can also be applied to all related technical fields that can prevent damage and shortening the life of the equipment through friction control or improve the performance of the equipment.

In addition, when the vibration is applied to the test piece, it is possible to check the change of the friction force and acquire the friction characteristic or the friction coefficient data according to the vibration characteristics such as different frequencies, amplitudes, and the moving speeds and the vertical load conditions.

In addition, it is possible to accurately measure the frictional force of linear structures such as sports equipment such as skis and skates.

In addition, unlike existing experimental equipment which used only a small number of test specimens, it is possible to test specimens composed of various shapes and materials.

1 is a right side view of a preferred embodiment of the present invention.
2 is a plan view of a preferred embodiment of the present invention.
3 is an enlarged view of Fig.
4 is a view showing a state in which the press plate and the moving frame are separated from each other according to a preferred embodiment of the present invention.
5 is a view showing a state in which a presser plate and a moving frame are in close contact with each other according to a preferred embodiment of the present invention.
FIG. 6 is a photograph of a physical object according to a preferred embodiment of the present invention.
7 is an enlarged view of a moving cart according to a preferred embodiment of the present invention.
8 is an enlarged view of a vertical load cell and a horizontal load cell according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In addition, the preferred embodiments of the present invention will be described below, but it is needless to say that the technical idea of the present invention is not limited thereto and can be variously modified by those skilled in the art.

First, the configuration of a friction measuring device for a vibrating structure according to an embodiment of the present invention will be described.

1 and 2, the apparatus for measuring friction of a vibrating structure according to an embodiment of the present invention includes a main body 10 on which various devices are mounted, a driving device 20 provided on one side of the main body 10, A pulley 30 provided at the other end of the main body 10 in opposition to the drive device 20, a power transmitting member 40 connecting the drive device 20 and the pulley 30, And a moving cart 50 that performs a linear movement along the moving rail 11. [

Specifically, the main body 10 is a structure composed of a combination of frames. A linear moving rail 11 is provided on both sides of the upper and lower sides of the main body 10. So that the moving cart 50 moves along the moving rail 11. A bottom surface rail 12 is provided on the bottom surface of the main body 10. The test piece 60 attached to the moving cart 50 moves in a state of being in close contact with the bottom surface rail 12.

The material of the bottom surface rail 12 is preferably selected according to the specifications such as the length, width, width, material, etc. of the test piece 60 and friction. For example, if the test piece 60 is a skate, the bottom surface rail 12 may be an ice surface.

The driving device 20 is provided at one end of the main body 10. The driving device 20 may be a motor. A pulley opposed to the pulley 30 provided at the other end of the main body 10 is provided at the shaft end of the drive device 20. [ In Figure 1, the drive device 20 is shown at the front, with the pulley 30 facing the rear of the main body 10. The drive device 20 is connected to the pulley 30 provided at the other end of the main body 10 by the power transmitting member 40. The drive device 20 can be controlled by the control box 200. That is, the control box 200 adjusts the rotation speed of the driving device 20 so that the moving speed of the moving cart 50 can be controlled.

The pulley 30 is rotatably mounted on the other end of the main body 10 so as to face the drive device 20. [ The pulley 30 is connected to the drive device 20 by the power transmitting member 40. Therefore, it is preferable that the pulley 30 is positioned on the horizontal line with the driving device 20. [ The pulley 30 may be a belt pulley.

The power transmitting member 40 connects the driving device 20 and the pulley 30 opposed thereto. When the driving device 20 is driven, the rotational force of the driving device 20 is transmitted to the power transmitting member 40, and the power transmitting member 40 rotates. The pulley 30 connected to the power transmitting member 40 rotates in conjunction with the rotation of the power transmitting member 40. [ The power transmitting member 40 may be a timing belt. One end of the power transmitting member 40 is connected to one end of the moving cart 50 via a pulley provided at a shaft end of the driving device 20. [ The other end of the power transmitting member (40) is connected to the other end of the moving cart (50) via a pulley (30).

As shown in FIG. 3, the moving cart 50 is placed on the movable rail 11 of the main body 10 and moves along the movable rail 11. As shown in FIG. The moving cart 50 includes a moving frame 51 placed on the moving rail 11 and a center shaft 52 provided through the center of the moving frame 51.

Specifically, the moving frame 51 is substantially in the form of a flat plate. At the four corners of the bottom surface of the moving frame 51, a sliding member is provided. The sliding member is brought into close contact with the surface of the movable rail (11), and the sliding movement moves along the movable rail (11). The front and back sides of the upper surface of the moving frame 51 may be provided with engaging portions for engaging both ends of the power transmitting member 40.

The center shaft 52 is vertically installed through the center of the moving frame 51. The upper end of the center shaft 52 is installed so as to protrude upward from the center of the upper surface of the moving frame 51. The lower end of the central shaft 52 is installed toward the bottom surface rail 12 of the main body 10. [

A vibrator 70 is provided at the upper end of the center shaft 52. The vibrator (70) serves to apply vibration to the test piece (60). The vibrator 70 may be a pneumatic vacuum operated by the compressor 100 or a vibration motor. The vibrator (70) is controlled in vibration by the control box (200). The vibrator (70) applies vibration to the test piece (60) to induce a characteristic vibration characteristic of the test piece (60). At this time, the vibration characteristic may be a frequency, an amplitude, and a vibration mode.

A test piece 60 is attached to the lower portion of the central shaft 52. The test piece 60 is attached to the lower portion of the central shaft 52. The test piece 60 moves along the bottom surface rail 12 while being in close contact with the bottom surface rail 12 of the main body 10. The test piece 60 may be various kinds of test pieces that require friction tests as well as sports equipment such as skis and skates.

A load cell is provided between the center shaft 52 and the test piece 60. The load cell is preferably a multi-axial load cell. The load cell is installed between the central axis 52 and the test piece 60 and includes a vertical load cell 310 installed in a vertical direction as in the installation direction of the center shaft 52 and a horizontal And a load cell 320.

The vertical load cell 310 is vertically installed at the lower end of the center shaft 52 so as to be connected to the center shaft 52. The vertical load cell 310 measures the vertical force of the test piece 60. The vertical force simply measures the load on the vibrator and the instrument itself, sets the initial value, and adjusts the compression spring 55 to match the desired vertical load.

The horizontal load cell 320 measures the horizontal force of the test piece 60. The force acting between the test piece 60 and the floor rail 12 is measured when the test piece 60 is moved by the operation of the moving cart 50 in the case of the horizontal force. It is preferable that a support frame is installed under the vertical load cell 310 and a horizontal load cell 320 is installed on the upper surface of the support frame so as to be perpendicular to the horizontal load cell 320.

The frictional force and the friction coefficient of the test piece 60 are measured according to the scientific calculation results of the data obtained using the vertical load cell 310 and the horizontal load cell 320. The data measured in the vertical load cell 310 and the horizontal load cell 320 are transmitted to the PC via the control box 200 and the DAQ. In the PC, frictional force and friction coefficient calculation program are inputted, and the experimental result of the test piece 60 is shown as a table and a graph. DAQ (Data Acquisition) is a data acquisition device.

The center shaft 52 is fitted with a compression spring 55. The compression spring 55 is fitted to the portion of the compression spring 55 between the moving frame 51 and the vertical load cell 310. The upper end of the compression spring 55 is hooked on the jaw of the central shaft 52 and the lower end of the compression spring 55 is located on the upper part of the vertical load cell 310. The compression spring 55 applies a load to the test piece 60 during compression.

As shown in FIG. 3, the center shaft 52 is provided with a pressure plate 53. The pressure plate 53 is provided above the moving frame 51 at a predetermined interval from the moving frame 51. [ The press plate (53) and the moving frame (51) are screwed together by the press bolt (54). 4, when the pressure bolt 54 is tightened with the pressure bolt 54 being spaced apart from the moving frame 51 as shown in FIG. 4, the pressure plate 53 is lowered and the pressure plate 53 is lowered The connected central shaft 52 also descends. The compression spring 55 is compressed by the descent of the central shaft 52. As the compression spring 55 is compressed, its load is transmitted to the test piece 60. Therefore, a desired vertical load can be applied to the test piece 60 through the tightening operation of the press bolt 54.

As shown in FIGS. 1 and 6, a speed sensing sensor 80 may be installed on one side of the main body 10. The speed sensing sensor 80 senses the moment when the moving cart 50 passes and sends a signal to the control box 200. The control box 200 receiving the signal of the speed detection sensor 80 stops the driving device 20 to stop the moving cart 50. The speed sensing sensor 80 is installed above the main body 10 in the direction in which the moving cart 50 moves. The speed sensing sensor 80 serves to prevent the moving cart 50 from moving on the moving rail 11 and colliding with other members.

At one side of the main body 10, there is provided an ultra-high speed camera for photographing the vibration characteristics of the test piece 60 when the moving cart 50 is moved. The vibration of the test piece 60 can be visually confirmed by supplementing the precision of the measurement result of the acceleration sensor through the ultra-high speed camera.

As shown in FIG. 7, a cable bearer may be provided on one side of the main body 10. The cables connected to the moving cart 50 are bundled and neatly arranged so as to prevent the cable from being damaged during operation of the moving cart 50 and to prevent the operation of the moving cart 50 from being hindered. For example, if the cables related to the vertical load cell 310 and the horizontal load cell 320 are bundled and bundled together, the cable can be prevented from being damaged when the moving cart 50 is moved, and the moving cart 50 can smoothly move without being disturbed by the cable .

As shown in FIG. 8, a detection sensor 90 may be attached to the test piece 60. The detection sensor 90 may be an acceleration sensor or a strain gauge.

The acceleration sensor is attached to each position of the set test piece 60 to measure the frequency, amplitude, and sliding speed according to the length of the test piece 60 when the test piece 60 moves along the bottom surface rail. The spray gauge is attached to each position of the set test specimen to measure the stress distribution at each position of the specimen 60.

In FIG. 8, the detection sensor 90 is installed at three points of the test piece 60, but it is not limited thereto. The number of the detection sensors 90 and the mounting position of the test piece 60 can be variously changed.

As described above, the apparatus for measuring friction of a vibrating structure according to an embodiment of the present invention is a linear vibration friction measuring apparatus that moves in a straight line. The apparatus measures variation in shape, material properties, and bottom surface material of a test piece The natural vibration characteristics of the structure can be controlled and the frictional force or friction coefficient can be measured accordingly.

In addition, it is possible to more precisely measure the influence of the vibration on the friction without the measurement error due to the centrifugal force generated during the rotation curvature and the rotation as compared with the experiment apparatus of the conventional rotation type.

In addition, the frictional force of a relatively large contact surface can be measured for test pieces having various shapes, slenderness ratio, and material properties.

In addition, the overall or local vibration characteristics of the test specimen can be measured and observed at the same time using an acceleration sensor, a strain gauge, a high-speed camera, and the like. This can be used not only to investigate the correlation between friction and vibration, but also to contribute to study the effect of the vibration characteristics of the specimen position on the friction according to the structural and mechanical characteristics of the test specimen. In addition, the vertical load acting on the test specimen and the speed of movement of the test specimen can be used to measure the correlation with them. These measurements are expected to enable effective control of friction through vibration control and have a ripple effect such as the development of technology capable of reversing the shape and material of a structure so as to exhibit the vibration characteristics required to obtain the desired frictional force .

In addition, since each component can be disassembled and assembled, it is possible to experiment in the long section by simply extending the movable rail, and by exchanging and improving the performance of each component, it is possible to realize a more harsh environment such as speed, load, surface roughness , Change of the medium such as water surface or ice surface, and so on. In addition, it is possible not only to apply vibration having different vibration characteristics by replacing the vibrator, but also to observe the change of the frictional force with respect to the front, rear vibration, left and right vibration in addition to the vertical vibration of the test piece. There is a difference. Therefore, it is expected that it will be easier to observe the change of friction due to the complex vibration which has not been done previously due to easy replacement of parts.

The following describes the operation of the apparatus for measuring friction of a vibrating structure according to an embodiment of the present invention.

As shown in FIGS. 1 and 2, when the power is applied to the driving apparatus 20, the driving apparatus 20 is driven. The power transmitting member 40 for connecting the drive unit 20 and the pulley 30 in association with the drive of the drive unit 20 rotates. At the same time, vibration of the test piece 60 is applied by the operation of the vibrator 70. As the power transmitting member 40 rotates, the moving cart 50 connected to the power transmitting member 40 moves along the moving rail 11 in the arrow direction of Fig.

When the moving cart 50 is moved, the lower test piece 60 moves along the bottom surface rail 12 while being in tight contact with the bottom surface rail 12 of the main body 10 in a vibrating state. The load applied to the test piece 60 before the operation of the moving cart 50 is adjusted. As shown in Fig. 5, the pressing plate 53 is pressed to press the compression spring 55 while the center shaft 52 is lowered to apply a load to the test piece 60 attached to the lower part of the moving cart 50 do. The moving cart 50 stops the instantaneous operation of the speed sensing sensor 80 provided at the upper portion of the main body 10 and stops. When the moving cart 50 passes the speed sensing sensor 80, the speed sensing sensor 80 sends a signal to the control box 200. The control box 200 receiving the signal stops the driving device 20 and stops the operation of the moving cart 50.

Specifically attached to the test piece 60 and the compression spring 55 in the horizontal and vertical directions when the test piece 60 is moved in a certain direction with the test piece 60 attached to the moving cart 50 on the movable movable rail 11 The force is measured by the horizontal load cell 320 and the vertical load cell 310 and is measured through a sensing sensor 90 such as an acceleration sensor and a strain gauge attached to each position of the test piece 60 according to the length of the test piece 60 Measure changes in frequency and amplitude.

Also, it is possible to visually confirm the shape of the vibration of the test piece 60 during the linear movement of the moving cart 50 through the high-speed camera. In the case of the vibrator 70, the vibration applied to the test piece 60 is controlled. The vibrator (70) starts vibrationlessly and gradually increases the frequency to apply vibration to the test piece (60). The horizontal load cell 320 and the vertical load cell 310 obtain horizontal and vertical forces, respectively. In the case of a horizontal force, the magnitude of the force acting between the test piece 60 and the bottom rail 12 is measured when the test piece 60 is moved by the moving cart. The load of the vibrator 70 and the equipment itself is simply measured and set to an initial value and the compression spring 55 is pressed to apply a desired load to the test piece 60 so that the vertical load .

The frictional force and the friction coefficient of the test piece 60 are measured according to the scientific calculation result through the force obtained by using the vertical load cell 310 and the horizontal load cell 320. Eventually, the whole process is observed on the PC screen connected to the load cell.

Meanwhile, when the test piece (60) moves through the acceleration sensor attached to each position of the test piece (60), the frequency, amplitude and sliding speed of each position according to the length are simply measured to determine the magnitude of friction It is possible to observe the vibration shape of each position according to the length of the object to which the vibration is applied. This makes it possible to visually confirm the vibration shape of the test piece 60 by supplementing the precision of the measurement result of the acceleration sensor through the ultra-high speed camera. Further, by additionally attaching a strain gauge to the test piece 60, the stress distribution at each position of the test piece 60 can be confirmed.

Next, an experimental method according to an embodiment of the present invention will be described. The experimental method is as follows.

1. Selection of test conditions for test piece and bottom surface to measure friction force or friction coefficient

Select the specimens such as length, width, width, and material of the test specimen to be used in the experiment and the material of the bottom surface to be used for friction. The test specimen and the bottom surface are freely changeable according to the contents to be tested. For example, if the test piece is a sports equipment such as ski, skate, etc., the bottom surface may be a glazing surface.

2. Determine the vibration mode, vibration speed, and vertical load to be observed through the experiment.

Determine the frequency, velocity and vertical load of the vibration to be observed after the test specimen and bottom surface to be used for the experiment are determined. After the test piece is attached, tighten the pressure bolt and apply the desired load to the compression spring. The speed and the magnitude of the vibration are controlled through the control box connected to the equipment. The vibration of the vibrator is adjustable through the pressure of the air compressor. However, in the case of a non-pneumatic electric motor or other type of vibrator, the vibrator may be controlled via electrical signals rather than pressure.

In case of a load, the compression spring is pressed through the pressing bolt by applying a load to the test piece by pressing the compression spring. Therefore, when the pressure bolt is tightened, the load applied to the specimen increases, and when applied, the load applied to the specimen decreases. Apply a load to the compression spring through the press bolt and adjust the load to be evenly distributed through the leveling bolt. At this time, the size of the load controlled through the pressure bolt is checked by the PC through the vertical load cell, and the desired load is controlled through the load cell.

In case of speed, the speed is controlled by adjusting the number of revolutions of the driving device for rotating the power transmitting member such as a timing belt. This can be controlled in the control box and can be adjusted not only at constant speed but also at acceleration.

3. Turn the switch ON so that the test specimen can move

Before performing the vibration test through the vibrator, we obtain the test results in the vibration free state. Specifically, vibration is first applied to the vibrator in the control box so that the test piece does not move and receives the vibration in the stopped state. After confirming that the vibration is transmitted well, switch on the device so that the test piece can move at the determined speed. During the test, the force applied to the specimen is measured on the attached horizontal and vertical load cell and the measured output is transferred to the PC via the control box and DAQ (Data Acquisition). The output value delivered to the PC is digitized by post processing. The moving cart advances and stops after decelerating momentarily through the speed sensor installation section.

4. Acceleration sensor and high-speed camera shooting and additional experimentation by strain gage

Move the control box switch in the forward direction after inputting the determined frequency, moving speed, and vertical load. At this time, when the moving cart advances and the moving cart passes the speed sensing sensor, the moving cart stops after decelerating. During the experiment, we measure the magnitude of each force in the vertical and horizontal direction of the load cell, and measure and observe the frequency, amplitude, and moving speed of the specimen through the acceleration sensor and the ultra-high speed camera. The strain distributions of the test specimens can also be checked through the strain gages attached to the specimens.

Specifically, through the acceleration sensor, vibration shapes such as frequency, amplitude, etc. can be measured for each position of the test piece. It can be viewed as accurate data and is used to analyze the vibrations that occur in real specimens. In addition, the moving speed of the test piece can be accurately measured. In case of super high-speed camera shooting, the actual test specimen can visually show the moving shape, as well as the acceleration of the specimen, and the amplitude of the specimen can be accurately displayed without error. The speed can also be measured. In the case of strain gauges, it is possible to check the stress distribution by the position of the specimen.

5. After the first experiment, repeat the experiment to obtain additional results and average them

In order to increase the reliability of the experiment, iterative experiment is used to obtain many results under the same condition and average them to obtain accurate results. After completing the experiment, if you want to experiment under different conditions, adjust the direction of the moving switch of the moving cart to the reverse position and return to the original position. In order to increase the reliability of the measured values, the average value is measured after repeatedly performing the same conditions.

6. After completion of the experiment, change the variables such as test piece, bottom surface, speed, load, vibration mode, etc.

Repeat the previous procedure while changing the frequency, moving speed, and vertical load, and observe the change of the frictional force according to each condition. Experiments based on various situations show that not only the result is obtained in one condition, but also the change of the frictional force or the friction coefficient according to the change of the condition, and graphs it. This confirms the tendency of the results.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: main body 11: movable rail
12: bottom surface rail 20: driving device
30: pulley 40: power transmission member
50: Moving cart 51: Moving frame
52: center shaft 53:
54: pressure bolt 55: compression spring
60: Specimen 70: Vibrator
80: Speed sensing sensor 90: Sensing sensor
100: compressor 200: control box
310 vertical load cell 320 horizontal load cell

Claims (24)

A main body having a movable rail at an upper portion thereof and a floor rail at a lower floor thereof; A drive unit provided at one end of the main body; A pulley provided at a side of the main body opposite to the driving device; A power transmitting member connecting the drive unit and the pulley; And a moving cart connected to the power transmitting member and moving along a moving rail of the main body; / RTI >
The moving cart includes:
A moving frame connected to the power transmitting member and positioned on a moving rail of the main body and moving along a moving rail of the main body; And an upper end connected to the moving frame, the upper end of the moving frame passing through the moving frame and the lower end passing through the moving frame and facing the bottom rail of the main body; / RTI >
Wherein a test piece is attached to a lower portion of the central axis and the test piece moves along a bottom surface rail of the main body while closely contacting the bottom surface rail of the main body.
The method according to claim 1,
The power transmitting member includes:
Wherein the timing belt is a timing belt.
delete delete The method according to claim 1,
On the central shaft,
Characterized in that a vibrator is provided.
The method of claim 5,
The vibrator may include:
Characterized in that it is a pneumatic vibrator or a vibration motor operated by a compressor.
The method of claim 5,
The driving device and the vibrator may include:
Wherein the control device is controlled by a control box.
The method according to claim 1,
Between the center axis and the test piece,
And a load cell is provided on the inner surface of the vibrating structure.
The method of claim 8,
In the load cell,
Wherein the multi-axial load cell is a multi-axial load cell.
The method of claim 8,
In the load cell,
A vertical load cell installed below the central axis in the same vertical direction as the central axis; And
A horizontal load cell installed in a horizontal direction perpendicular to the vertical load cell;
Wherein the friction measuring device is a friction measuring device.
The method of claim 10,
Wherein a compression spring is fitted to the center shaft and the compression spring is positioned between the lower part of the moving frame and the vertical load cell.
The method of claim 11,
The presser plate is attached to the center shaft. The presser plate is installed above the moving frame with an interval therebetween, and is screwed to the moving frame by a press bolt. When the presser bolt is tightened, And the compression spring is compressed while the central shaft connected to the lower shaft is lowered to apply a load to the test piece.
The method of claim 5,
The vibrator may include:
And vibration is applied to the test piece under the central axis to induce inherent vibration characteristics of the test piece.
14. The method of claim 13,
The vibration characteristics are,
And a vibration mode, a vibration mode, an amplitude mode, and a vibration mode, or a combination of these data.
The method of claim 8,
The data measured by the load cell is,
And transmitted to the PC via the control box and the DAQ.
The method according to claim 1,
Wherein a speed sensing sensor is provided at one side of the main body and a control box receiving a signal from the speed sensing sensor stops the driving device when the moving cart passes the speed sensing sensor installation section to stop the moving cart. It is characterized by a friction measuring device for vibrating structures.
The method of claim 8,
In the load cell,
Wherein the frictional force or the normal force of the test piece is measured.
The method according to claim 1,
In the test piece,
And a sensor for detecting the friction of the vibrating structure.
19. The method of claim 18,
The detection sensor includes:
An acceleration sensor or a strain gauge.
The method of claim 19,
The acceleration sensor includes:
And measuring a vibration frequency, an amplitude, and a sliding speed of each of the positions according to the length of the test piece when the test piece is moved along the bottom surface rail by being attached to each position of the set test piece. Device.
The method of claim 19,
Wherein the strain gauge comprises:
Wherein the stress distribution at each position of the test piece is attached to each position of the set test piece.
The method according to claim 1,
On one side of the main body,
Speed camera for photographing a vibration characteristic of the test piece.
The method according to claim 1,
The test piece may be,
Characterized in that it is a ski or a skate.
The method according to claim 1,
The driving device includes:
Wherein the motor is a motor.
KR1020150056321A 2015-04-22 2015-04-22 Apparatus for measuring friction of vibrating structures KR101686207B1 (en)

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CN111537375B (en) * 2020-04-24 2022-11-01 绍兴市希比斯新材料有限公司 A operating equipment that is used for ageing-resistant experiment of ABS plastics skis
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