CN106596017B - Eddy-current damping characteristic test device - Google Patents
Eddy-current damping characteristic test device Download PDFInfo
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- CN106596017B CN106596017B CN201611152778.XA CN201611152778A CN106596017B CN 106596017 B CN106596017 B CN 106596017B CN 201611152778 A CN201611152778 A CN 201611152778A CN 106596017 B CN106596017 B CN 106596017B
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- eddy
- current damping
- damping characteristic
- test device
- cantilever beam
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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
Abstract
The present invention provides a kind of eddy-current damping characteristic test devices, it include: bottom plate, support plate, leadscrew-nut mechanism, guide rail, L shaped plate, vertical beam, supporting member and cantilever beam, wherein guide rail, vertical beam and leadscrew-nut mechanism are mounted on bottom plate, and eddy-current damping characteristic test device further includes vibration excitor, power hammer, accelerometer, data collecting card, computer, the neodium magnet being arranged in L shaped plate, the first graduated scale being arranged on guide rail, the second graduated scale being arranged on vertical beam.Vertical beam is bolted to connection in one end of bottom plate, leadscrew-nut mechanism is mounted on the bottom plate other end, guide rail is mounted on lead screw two sides of leadscrew-nut mechanism and parallel with lead screw, support plate and the L shaped plate connecting with support plate can be made to slide on guide rail by adjusting screw nut body, one end of supporting member is connect with cantilever beam, the other end of supporting member with vertical beam can cooperate in a manner of vertical sliding, so as to drive cantilever beam vertical sliding.
Description
Technical field
The invention belongs to mechanical oscillation field more particularly to a kind of eddy-current damping characteristic test devices, are intended to test
It can be used for inhibiting the device of the eddy-current damping of mechanical oscillation.The eddy-current damping characteristic test device is additional to vibrating cantalever beam
Magnetic field generates eddy-current damping effect, which can be by changing magnetic induction line and cantilever beam vibration
Positional relationship, magnetic field strength, cantilever material, cantilever beam vibration frequency and the speed in face, cantilever beam and magnet distance are to electric whirlpool
The variation characteristic of flow resistance damping characteristics is analyzed.
Background technique
Mechanical oscillation are prevalent in various mechanical equipments.Vibratory output be more than allowed band, mechanical equipment will generate compared with
Big dynamic loading and noise will lead to the initial failure of components to influence its working performance and service life when serious.By
Increasingly complicated in modern mechanical structure, movement velocity increasingly improves, and the harm of vibration is more prominent.
Existing mechanical vibration control method can be mainly divided into active damping and passive vibration damping two major classes.Passive vibration damping
It is passive vibration damping, dedicated energy device offer energy is fitted without by doing negative work to vibration insulating system and consumes its vibrational energy
Amount realizes vibration suppression.Passive vibration damping can be divided into dynamic absorber and passive energy dissipation again.The current vortex resistance to be tested of apparatus of the present invention institute
Buddhist nun belongs to one of passive energy dissipation method, and the mechanism of action is based on electromagnetic induction principle.
Specifically, according to the law of electromagnetic induction, a part of conductor of closed circuit does the fortune of cutting magnetic induction line in magnetic field
When dynamic, induced current can be generated in conductor；It can be obtained by Lenz's law, faradic magnetic field always hinders to cause faradic
The variation of magnetic flux.Induced current based on generation will generate the effect counter-force of an obstruction conductor motion in magnetic field, this
Theory shows that system damping can be increased using current vortex caused by conductor motion in electromagnetic induction principle, to consume machinery
Vibrational energy in equipment.
Influence many because being known as of eddy-current damping characteristic, including magnetic field strength, conductor material, magnetic field arrangement, vibration
Dynamic frequency and speed etc..Due to its theoretical modeling complexity, the invention patent is directed to a kind of test device, passes through the side of experiment
Method carries out quantitative analysis to above-mentioned factor.
Summary of the invention
The purpose of the present invention is can influence of the quantitative analysis multiple parameters to eddy-current damping characteristic, which is to pass through
What following technical scheme was realized.
A kind of eddy-current damping characteristic test device, the eddy-current damping characteristic test device include: bottom plate, support
Plate, guide rail, leadscrew-nut mechanism, L shaped plate, vertical beam, supporting member and cantilever beam, the guide rail, vertical beam and lead screw spiral shell
Parent agency is mounted on bottom plate, also, the eddy-current damping characteristic test device further include vibration excitor, power hammer, accelerometer,
Data collecting card, computer, the neodium magnet being arranged in the L shaped plate, the first graduated scale being arranged on the guide rail, setting exist
The second graduated scale on vertical beam, the vertical beam are bolted to connection in one end of the bottom plate, the feed screw nut
Mechanism is mounted on the bottom plate other end, wherein the guide rail be mounted on the lead screw two sides of the leadscrew-nut mechanism and with it is described
Lead screw is parallel, the L that can make the support plate by adjusting the leadscrew-nut mechanism and connect with the support plate
Shape plate slides on the guide rail, and one end of the supporting member is connect with the cantilever beam, the other end of the supporting member
Can cooperate in a manner of vertical sliding with the vertical beam, so as to drive the cantilever beam vertical sliding.
Further, it is L-shaped thin plate that the bottom plate, which is shape,.
Further, bearing is installed respectively in two axial end portions of the lead screw, the bearing is fixed by bolt
On the bottom plate.
Further, the lead screw is fixedly connected with handwheel, and the nut of the leadscrew-nut mechanism is located on the lead screw,
When lead screw rotation, the nut can do linear movement.
Further, the support plate be used for connect the L shaped plate and the leadscrew-nut mechanism ut socket and
It can be moved on the guide rail, the L shaped plate is installed by bolt in the upper end of the support plate, and the lower end of the support plate is logical
It crosses bolt to be fixed on the ut socket, the ut socket is mounted on the nut, and the lower end of the support plate is also set
There is guide groove, the guide groove and the guide rail cooperate, and then enable the L shaped plate with the nut along the guide rail
Movement.
Further, the supporting member is made of square box and two thin plates, and the square box can be covered described perpendicular
It can move on straight beam and along the vertical beam, the square box is equipped with a threaded hole, and bolt can pass through the screw thread
Hole contacts with the vertical beam and then fixes the supporting member with the vertical beam and realize that position is adjustable, described two
Thin plate is for fixing the cantilever beam, and there are two threaded hole on one of thin plate, when installation, the cantilever beam was attached to another
On thin plate, bolt passes through the threaded hole makes the cantilever beam be fixed on the support structure until contacting with the cantilever beam
On part.
Further, first graduated scale can accurately record the position of the L shaped plate, and the neodium magnet passes through gluing
Agent is bonded in the L shaped plate, in order to facilitate change magnet quantity during the test and then control magnetic field strength.
Further, second graduated scale can accurately record the position of the cantilever beam.
Further, first graduated scale and second graduated scale form an x-z coordinate system, with the first graduated scale
For x-axis, using the second graduated scale as z-axis, the neodium magnet can move in the x direction, and the cantilever beam can be transported in a z-direction
It is dynamic, so can the distance to the cantilever beam and the neodium magnet accurately controlled.
Further, the power hammer and the accelerometer are connected to the data collecting card, and the data collecting card connects
It is connected to the computer, the accelerometer is attached on the cantilever beam, the certain point on the cantilever beam is tapped with power hammer,
Frequency response curve is shown to the qualitative analysis that eddy-current damping effect is carried out on the computer, alternatively, with the vibration excitor to institute
It states cantilever beam and applies the vibration an of specific frequency to carry out the quantitative test of eddy-current damping effect, the eddy-current damping
Characteristic test device can be by changing the positional relationship of magnetic induction line and cantilever beam vibration plane, magnetic field strength, cantilever material, hanging
Arm beam vibration frequency analyzes the variation characteristic of eddy-current damping characteristic with speed, cantilever beam and magnet distance.
The present invention has the advantages that
1, apparatus of the present invention are by changing magnetic field strength, cantilever material, cantilever beam at a distance from magnet, cantilever beam vibration
The parameters such as frequency, can influence of the quantitative analysis multiple parameters to eddy-current damping characteristic；
2, apparatus of the present invention have two kinds of magnetic field arrangement forms of vertical direction and horizontal direction, can test magnetic induction line respectively and hang
Inhibition of vibration when arm beam vibration face is vertical, when magnetic induction line is parallel with cantilever beam vibration plane；
3, apparatus of the present invention use vibration excitor excitation cantilever arm beam, can accurately test different vibration velocities and frequency lower cantalever
The eddy-current damping characteristic of beam；
4, apparatus of the present invention paste accelerometer, combined data capture card and the use for analyzing software on a cantilever beam,
Vibration data can be obtained in real time；
5, the conveniently adjusted various parameters of eddy-current damping characteristic test device of the present invention, it is easy to operate, it is easy to use with
It promotes.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is the perspective view of eddy-current damping characteristic test device of the present invention；
Fig. 2 is the top view of eddy-current damping characteristic test device of the present invention；
Fig. 3 is the sectional view that the line A-A along Fig. 1 of eddy-current damping characteristic test device of the present invention intercepts；
Fig. 4 is the sectional view that the line B-B along Fig. 1 of eddy-current damping characteristic test device of the present invention intercepts；
Fig. 5 for eddy-current damping characteristic test device of the present invention test schematic；
Fig. 6 is the magnetic field arrangement figure of eddy-current damping characteristic test device of the present invention；
Fig. 7 is the neodium magnet location drawing of eddy-current damping characteristic test device of the present invention.
Appended drawing reference in attached drawing are as follows:
1- bottom plate 201- bearing A 202- lead screw
203- bearing B 204- handwheel 205- nut
206- ut socket 301- guide rail A 302- guide rail B
4- support plate 5-L shape plate 6- cantilever beam
7- supporting member 8- vertical beam 9- bolt
10- neodium magnet 11- the first graduated scale the second graduated scale of 12-
Specific embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in attached drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.It is to be able to thoroughly understand the disclosure on the contrary, providing these embodiments, and can be by this public affairs
The range opened is fully disclosed to those skilled in the art.
Present invention will be described in further detail below with reference to the accompanying drawings.
The present invention provides a kind of eddy-current damping characteristic test devices, as shown in Figure 1, Figure 2, Figure 3, Figure 4, the current vortex
Damping characteristic test device includes bottom plate 1, leadscrew-nut mechanism, guide rail, support plate 4, L shaped plate 5, cantilever beam 6, vertical beam 8, spiral shell
Bolt 9, neodium magnet 10, the first graduated scale 11, the second graduated scale 12.
In eddy-current damping characteristic test device of the invention, bottom plate 1 is a L-shaped thin plate, is equipped on bottom plate 1
Guide rail, vertical beam 8 and leadscrew-nut mechanism.It is fixed together between vertical beam 8 and bottom plate 1 by bolt 9, vertical beam 8
Equipped with the groove extended along the vertical direction, for installing graduated scale 12.Guide rail 3 is fixedly connected on bottom plate 1 by bolt 9, such as
Shown in Fig. 4, bearing 201 and bearing 203 are bolted to connection on bottom plate 1, and wherein the distance between two bearings are equal to and lead
The length of rail 3, two bearings 201,203 are located at two axial end portions of lead screw 202, and guide rail 3 is located at 202 two sides of lead screw and phase
It is mutually parallel.Handwheel 204 and lead screw 202 are fixed together.Nut 205 is located between two bearings 201,203 and can be along lead screw
202 movements.
For connecting L shaped plate 5 and ut socket 206 and can move on guide rail, 4 upper end of support plate passes through support plate 4
Bolt 9 is fixedly connected with L shaped plate 5, and 4 lower end of support plate is fixed on ut socket 206 by bolt 9, and ut socket 206 is mounted on
On nut 205.There is guide groove in 4 lower end of support plate, this guide groove slidably cooperates with guide rail 3, and then can make L shaped plate
5 move along guide rail 3 together with nut 205.
Supporting member 7 is used for connecting cantilever beam 6 and vertical beam 8, and supporting member 7 is made of square box and two thin plates, side
Shape frame can be covered on vertical beam 8 and can be slided on vertical beam 8, and square box is equipped with a threaded hole, and bolt 9 may pass through the spiral shell
Pit contacts with vertical beam 8 and then fixes supporting member 7 with vertical beam 8 and realize that position is adjustable, shown in Fig. 2；Support structure
Two thin plates of part 7 are used for cantilever mounted beam 6, and there are two threaded hole on one of thin plate, cantilever beam 6 is attached to another when installation
On a thin plate, bolt 9, which passes through threaded hole and contacts with cantilever beam 6, is fixed on cantilever beam 8 on supporting member 7.
Graduated scale 11 (scale division value 0.5mm) is installed on guide rail 301, can accurately record the position of L shaped plate 5.In L shaped plate 5
Neodium magnet 10 is installed, neodium magnet 10 is bonded in L shaped plate 5 by adhesive, and facilitate change magnet quantity during the test,
10 distributing position of neodium magnet is shown in Fig. 7.Magnetic field strength can be controlled by changing the quantity of neodium magnet.The vertical beam 8 is equipped with recessed
Slot is equipped with graduated scale 12 (scale division value 0.5mm) in groove, can accurately record the position of cantilever beam 6.
Above-mentioned graduated scale 11 and graduated scale 12 just form an x-z coordinate system, are x-axis with graduated scale 11, and graduated scale 12 is z
Axis, then neodium magnet 10 can move in the x direction, and cantilever beam 6 can move in a z-direction, and then can be to cantilever beam 6 and neodium magnet 10
Distance accurately controlled.
Four positions and number of the neodium magnet 10 on L-type plate are as shown in Figure 7.Water between neodium magnet 10 and cantilever beam 6
Flat distance is adjusted by handwheel 204, and the distance of vertical direction is moved on vertical beam 8 by supporting member 7 to adjust.
It is needed in the eddy-current damping characteristic test device with the position that bolt is fixedly connected to include: guide rail 3 and bottom plate
1, bearing 2 and bottom plate 1, vertical beam 8 and bottom plate 1, support plate 4 and ut socket 206, L shaped plate 5 and support plate 4, supporting member 7
With cantilever beam 6, supporting member 7 and vertical beam 8.
The eddy-current damping characteristic test device further includes power hammer, vibration excitor, accelerometer, data collecting card, computer
(being shown for data), as shown in Figure 5.Carry out simple hammering experiment and specific frequency on this device respectively as the case may be
Vibration suppression experiment.Simple hammering experiment is primarily to the eddy-current damping characteristic for proving that apparatus of the present invention use can be used to
Inhibit vibration.Vibration suppression experiment under specific frequency mainly optimizes inhibition of vibration, determines there is best vibration suppression
Parameter value when effect.
Firmly hammer percussion cantilever beam makes its generate vibration in simply hammering experiment, and accelerometer is placed on beating point and nearby uses
Acquire cantilever Liang Sicheng, accelerometer and power hammer are all connected on data collecting card, data are collected to the data point of computer
It compares and handles in analysis software, compare the displacement of the impact force and accelerometer of power hammer, generate frequency response figure, calculate the resistance of beam
Buddhist nun's ratio, obtains the attenuating of cantilever beam vibration.
In specific frequency vibration suppression experiment, the vibration of specific frequency, acceleration are generated to cantilever beam using vibration excitor
Meter is placed on impacting point and is nearby used to acquire cantilever Liang Sicheng, and accelerometer and vibration excitor are all connected on data collecting card, will be counted
According to comparing and handling in the Data Analysis Software for collecting computer, compare the impact force of vibration excitor and the position of accelerometer
It moves, generates frequency response figure, calculate the damping ratio of beam, the attenuation of cantilever beam vibration is obtained, when Fig. 5 is using 3, No. 4 neodium magnets
The schematic diagram of specific frequency vibration suppression experiment.
The metal of different materials, different metal tools can be used in cantilever beam in the eddy-current damping characteristic test device
There is different conductivities, which can test eddy-current damping to the damping characteristic of different metal,
Such as aluminium, copper, iron etc..
Magnetic field strength and magnetic field arrangement form can be changed in the eddy-current damping characteristic test device.It is strong wherein to change magnetic field
Degree can be realized by changing the quantity of neodium magnet.There are two types of magnetic field arrangement forms for the eddy-current damping characteristic test device, such as
Vibration suppression shown in Fig. 6, when can test magnetic induction line and vertical cantilever beam vibration plane respectively, when magnetic induction line is parallel with cantilever beam vibration plane
Effect.
The distance between neodium magnet and cantilever beam can be changed in the eddy-current damping characteristic test device, this distance can use
One graduated scale (scale division value 0.5mm) and second graduated scale (scale division value 0.5mm) precise measurement, therefore eddy-current damping can be tested out
Distance value when maximum effect is played in mechanical vibration damping.
Eddy-current damping characteristic test device of the invention is by changing the various parameters for influencing eddy-current damping power with excellent
Change inhibition of vibration, lays a good foundation for the theoretical further research of eddy-current damping.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Subject to enclosing.
Claims (10)
1. a kind of eddy-current damping characteristic test device, which is characterized in that the eddy-current damping characteristic test device includes: bottom
Plate, support plate, guide rail, leadscrew-nut mechanism, L shaped plate, vertical beam, supporting member and cantilever beam, wherein the guide rail, described
Vertical beam and the leadscrew-nut mechanism are mounted on the bottom plate, also, the eddy-current damping characteristic test device also wraps
Vibration excitor is included, power hammer, accelerometer, data collecting card, computer, the neodium magnet being arranged in the L shaped plate, is arranged and is led described
The first graduated scale on rail, the second graduated scale being arranged on the vertical beam, the vertical beam be bolted to connection in
One end of the bottom plate, the leadscrew-nut mechanism is mounted on the bottom plate other end, wherein the guide rail is mounted on the silk
Lead screw two sides of thick stick nut body and parallel with the lead screw can make the support plate by adjusting the leadscrew-nut mechanism
And the L shaped plate connecting with the support plate is slided on the guide rail, one end of the supporting member and the cantilever
Beam connection, the other end of the supporting member with the vertical beam can cooperate in a manner of vertical sliding, so as to drive
State cantilever beam vertical sliding.
2. eddy-current damping characteristic test device according to claim 1, which is characterized in that the bottom plate is that shape is L
The thin plate of shape.
3. eddy-current damping characteristic test device according to claim 1, which is characterized in that in two axis of the lead screw
It is separately installed with bearing to end, the bearing is fixed on the bottom plate by bolt.
4. eddy-current damping characteristic test device according to claim 1, which is characterized in that the lead screw is fixedly connected with
The nut of handwheel, the leadscrew-nut mechanism is located on the lead screw, and when lead screw rotation, the nut can be done linearly
Movement.
5. eddy-current damping characteristic test device according to claim 4, which is characterized in that the support plate is for connecting
The ut socket of the L shaped plate and the leadscrew-nut mechanism and can be moved on the guide rail, the support plate it is upper
The L shaped plate is installed by bolt in end, and the lower end of the support plate is bolted on the ut socket, the nut
Sleeve is mounted on the nut, and the lower end of the support plate is additionally provided with guide groove, and the guide groove and the guide rail cooperate, into
And the L shaped plate is enable to move with the nut along the guide rail.
6. eddy-current damping characteristic test device according to any one of claim 1 to 5, which is characterized in that the branch
Support component is made of square box and two thin plates, the square box can cover on the vertical beam and can along it is described vertically
Beam movement, the square box are equipped with a threaded hole, and bolt can contact with the vertical beam across the threaded hole and then will
The supporting member is fixed with the vertical beam and realizes that position is adjustable, and described two thin plates are used to fix the cantilever beam,
There are two threaded hole on one of thin plate, when installation, the cantilever beam was attached on another thin plate, and bolt passes through the screw thread
Hole is fixed on the cantilever beam on the supporting member until contacting with the cantilever beam.
7. eddy-current damping characteristic test device according to any one of claim 1 to 5, which is characterized in that described
One graduated scale can accurately record the position of the L shaped plate, and the neodium magnet is bonded in the L shaped plate by adhesive, with
Convenient for facilitating change magnet quantity during the test and then controlling magnetic field strength.
8. eddy-current damping characteristic test device according to any one of claim 1 to 5, which is characterized in that described
Two graduated scales can accurately record the position of the cantilever beam.
9. eddy-current damping characteristic test device according to any one of claim 1 to 5, which is characterized in that described
It is z with the second graduated scale that one graduated scale and second graduated scale, which form an x-z coordinate system using the first graduated scale as x-axis,
Axis, the neodium magnet can move in the x direction, and the cantilever beam can move in a z-direction, and then can be to the cantilever
The distance of beam and the neodium magnet is accurately controlled.
10. eddy-current damping characteristic test device according to any one of claim 1 to 5, which is characterized in that the power
Hammer and the accelerometer are connected to the data collecting card, and the data collecting card is connected to the computer, the acceleration
Meter is attached on the cantilever beam, taps the certain point on the cantilever beam with power hammer, frequency response curve is shown in the electricity
The qualitative analysis of eddy-current damping effect is carried out on brain, alternatively, applying a specific frequency to the cantilever beam with the vibration excitor
The vibration of rate is to carry out the quantitative test of eddy-current damping effect, the eddy-current damping characteristic test device can be by changing
Become positional relationship, magnetic field strength, cantilever material, cantilever beam vibration frequency and the speed of magnetic induction line and cantilever beam vibration plane, hang
Arm beam is analyzed with variation characteristic of the magnet distance to eddy-current damping characteristic.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611152778.XA CN106596017B (en) | 2016-12-14 | 2016-12-14 | Eddy-current damping characteristic test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611152778.XA CN106596017B (en) | 2016-12-14 | 2016-12-14 | Eddy-current damping characteristic test device |
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| CN106596017B true CN106596017B (en) | 2019-01-29 |
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| CN107179515A (en) * | 2017-06-22 | 2017-09-19 | 同济大学 | A kind of eddy current damper health monitoring systems |
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| CN107941443B (en) * | 2017-12-25 | 2019-06-07 | 上海大学 | A kind of single-degree-of-freedom vortex magnetic damping Proof-Of Principle experimental provision |
| CN108318204B (en) * | 2018-03-21 | 2023-09-12 | 天津大学 | Electromagnetic impact vibration experimental device |
| CN111458288A (en) * | 2020-05-14 | 2020-07-28 | 中国船舶科学研究中心 | Material damping characteristic testing device |
| CN114061876A (en) * | 2021-10-29 | 2022-02-18 | 哈尔滨工业大学（深圳） | Damping characteristic measuring device |
| CN114812423A (en) * | 2022-04-25 | 2022-07-29 | 山东光安智能科技有限公司 | Mechanical digital disc type roof separation layer sensor |
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