CN205049331U - Test device of electric eddy -current damper rotational damping coefficient - Google Patents
Test device of electric eddy -current damper rotational damping coefficient Download PDFInfo
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- CN205049331U CN205049331U CN201520701136.5U CN201520701136U CN205049331U CN 205049331 U CN205049331 U CN 205049331U CN 201520701136 U CN201520701136 U CN 201520701136U CN 205049331 U CN205049331 U CN 205049331U
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- tester
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- eddy current
- current damper
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Abstract
The utility model discloses a test device of electric eddy -current damper rotational damping coefficient relates to suspension cable vibration control technical field. The top of the device's tester support is fixed with the tester that is used for testing rotation torque and rotational speed, and the top of motor support is fixed with motor and speed reducer, and motor and speed reducer are through driving the mobile core hub connection, the central level of tester is provided with the tester dabber, the one end of tester dabber through first shaft coupling with drive the mobile core hub connection, the other end has the damping axle through the second coupling joint, the outside cover of damping axle has two location retaining ring and no line strain testers that are fixed in the damping axle, and no line strain tester is connected with three set at least three -dimensional foil gages, and this three -dimensional foil gage is fixed in the surface of damping axle to along damping axle circumference evenly distributed. The utility model discloses not only simple structure, easily operation, and the measuring accuracy is high.
Description
Technical field
The utility model relates to Inclined Cable Vibration control technology field, is specifically a kind of device testing eddy current damper damping due to rotation coefficient.
Background technology
Suspension cable is the important primary structure member of cable-stayed bridge, because the initial damping of suspension cable is little, slenderness ratio large, under traffic loading and external wind load action, easily vibration problem occurs.Through practice test, increasing the modal damping of suspension cable system by installing suspension cable damper, is a kind of effective way to control the way of Inclined Cable Vibration.Current suspension cable damper has polytype, comprises hydraulic damper, pulse damper, rotary damper, viscous damper, eddy current damper etc.Wherein, eddy current damper is a kind of Novel inclined drag-line damper, this damper by displacement transmission system, the vibration of suspension cable is converted in the hoop alternating magnetic field that dampened disk formed at permanent magnet and rotates, thus generation eddy-current damping controls the vibration of suspension cable.
Determine that the most important parameters of eddy current damper vibration control effect is the damping due to rotation coefficient C of eddy current damper
r.Damping due to rotation coefficient C
ronly relevant with the internal structure of damping unit, i.e. the distance etc. of the magnetic induction density of the size of dampened disk, material electric conductivity, permanent magnet, dampened disk and permanent magnet, and have nothing to do with the dynamic response of suspension cable.In order to obtain ratio of damping C
r, usually can adopt theory calculate, numerical simulation and experimental test three kinds of methods.
Theory calculate refers under the prerequisite of certain hypothesis, sets up the theoretical model of the damping action produced when dampened disk rotates in magnetic field, calculates ratio of damping based on this theoretical model.But the alternating magnetic field that permanent magnet is formed is very complicated at space distribution rule, and theoretical formula is difficult to accurate description, and therefore often error is larger for result of calculation.
Numerical simulation utilizes electromagnetic finite element analysis software (as Maxwell), sets up the finite element model of damping unit, simulation permanent magnet formed spatial variations magnetic field and dampened disk move in this space magnetic field produce eddy-current damping effect.The method than theoretical calculation model closer to truly, but in fact the magnetic induction density of permanent magnet own is uneven, the change of the magnetic induction density of permanent magnet under magnet fixed disc effect, by the impact of magnet fixed disc material character, because these two parameters cannot Measurement accuracy, therefore there is certain error in the input parameter of finite element model, result in final numerical simulation result and also there is certain error.
What testing method adopted is universal testing machine, and universal testing machine can not directly be applied, and needing the convert rotational motion of electric eddy-current damping device is linear movement, and test method is comparatively complicated.In addition, the tonnage of conventional universal testing machine is comparatively large, and the ratio of damping of eddy current damper is less, makes test result precision not high.
Relatively above three kinds of methods are known, the shortcoming not malleable (error is larger) of theory calculate and numerical simulation, can only as the reference of damper primary design, and final ratio of damping still needs to be determined by test; And adopting universal testing machine to test, complicated operation and precision are not high.Therefore, adopt a kind of simple and practical method for testing and detecting, accurately test damper ratio of damping C
rit is the task of top priority.
Utility model content
For the defect existed in prior art, the purpose of this utility model is to provide a kind of device testing eddy current damper damping due to rotation coefficient, and not only structure is simple, is easy to operation; And measuring accuracy is high.
For reaching above object, the technical scheme that the utility model is taked is: provide a kind of device testing eddy current damper damping due to rotation coefficient, comprise base plate and the tester bracket, the electric machine support that are fixed on base plate top, the top of tester bracket is fixed with the tester for testing rotary torque and rotating speed, the top of electric machine support is fixed with motor and speed reducer, and motor is connected by driving mandrel with reductor; The central horizontal of tester is provided with tester mandrel, and one end of tester mandrel is connected with described driving mandrel by the first shaft coupling, and the other end is connected with the damping shaft for being connected with eddy current damper by the second shaft coupling; The outer cover of described damping shaft is provided with two for limiting the positioning retainer ring that eddy current damper moves axially, and two positioning retainer rings are all fixed on damping shaft; The outside of damping shaft is also arranged with wireless strain tester, and wireless strain tester is connected with at least three cover three-dimensional foil gauges, and described three-dimensional foil gauge is fixed on damping shaft outside surface, and is uniformly distributed along damping shaft circumference.
On the basis of technique scheme, described tester is fixed on tester bracket by least 2 setting nuts.
On the basis of technique scheme, described setting nut is four, and four setting nuts are symmetrical arranged along the longitudinal axis of tester.
On the basis of technique scheme, the outside surface of described damping shaft is evenly distributed with four cover three-dimensional foil gauges along its circumference.
On the basis of technique scheme, the inside of described tester is provided with moment of torsion acquisition module and rotating speed acquisition module.
On the basis of technique scheme, this device also comprises microcontroller, and described microcontroller is connected with motor, reductor, tester, wireless strain tester respectively.
The beneficial effects of the utility model are:
1, in the utility model, the top of tester bracket is fixed with the tester for testing rotary torque and rotating speed, the top of electric machine support is fixed with motor and speed reducer, tester is connected with reductor, damping shaft respectively by tester mandrel, and damping shaft is connected with eddy current damper to be measured by bearing, flat key.With need to arrange compared with large tonnage universal testing machine in prior art, proving installation structure of the present utility model is simple, be easy to install, and debugging and the maintenance in later stage are convenient, can meet actual production designing requirement.
When 2, utilizing device of the present utility model to test, motor drives the tester mandrel of tester to rotate by driving mandrel, tester mandrel drives damping shaft to rotate by the second shaft coupling, damping shaft drives two of eddy current damper to be measured dampened disks to rotate by flat key, rotate dampened disk and magnet fixed disc on permanent magnet relatively rotate, produce eddy-current damping, and then form the rotation that damping torque hinders damping shaft.When proving installation and eddy current damper to be measured all remain a constant speed rotate time, namely accurately test out rotary torque T and rotational speed omega by tester, finally according to formula C
r=T/ ω, calculates corresponding damping due to rotation coefficient C
r.Whole operating process is simple and convenient, be easy to operation, and with adopt compared with numerical simulation mode or theory calculate mode in prior art, the error of method of testing of the present utility model is less.
3, in the utility model, the outer cover of damping shaft is provided with two positioning retainer rings, and two positioning retainer rings are close to the outside of two dampened disks respectively, the axis of two dampened disks along damping shaft in rotation process can be prevented to be moved, thus play spacing effect; In addition, the outside of damping shaft is also arranged with wireless strain tester, wireless strain tester is connected with at least three cover three-dimensional foil gauges by wire, this wireless strain tester and three-dimensional foil gauge are used for testing the stress distribution of damping shaft hoop, under judging whether proving installation is in imperfect duty according to the stress value tested, need to carry out right alignment adjustment, thus effectively ensure that the stability in test process and accuracy.
4, in the utility model, tester is fixed on tester bracket by setting nut.When the strain value by three-dimensional foil gauge judges that proving installation is under imperfect duty, by setting nut, tester is finely tuned, make whole device in rotation process, ensure good right alignment, and then ensure that proving installation is the test carried out under being in ideal operation state, effectively improve measuring accuracy.
5, of the present utility model applied widely, the test of the damping due to rotation coefficient of all kinds of eddy current damper can not only be applicable to, the moment of torsion of other equipment, measurement of rotating speed field can also be expanded to.
Accompanying drawing explanation
Fig. 1 is the structural representation of the device testing eddy current damper damping due to rotation coefficient in the utility model embodiment;
Fig. 2 is the enlarged diagram of part A in Fig. 1;
Fig. 3 is the distribution schematic diagram of three-dimensional foil gauge in the utility model embodiment.
Reference numeral:
1-dampened disk; 2-magnet fixed disc; 3-bearing; 4-flat key; 5-hold-down nut; 6-positioning retainer ring; 7-locating ring; 8-damping shaft; 9-three-dimensional foil gauge; 10-wireless strain tester; 11-second shaft coupling; 12-tester mandrel; 13-tester; 14-first shaft coupling; 15-drives mandrel; 16-reductor; 17-motor; 18-base plate; 19-tester bracket; 20-setting nut; 21-electric machine support.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
When practical operation, ratio of damping C
rbe not directly record, but by indirectly testing rotary torque and rotating speed, then obtain according to formulae discovery.Specifically, according to the mechanical relationship of eddy current damper whirligig:
T＝C
r·ω
In formula, T is rotary torque, and unit is Nm; ω is rotating speed, and unit is rad/s.Wherein T and ω is measured by the utility model device, then utilizes above-mentioned formulae discovery to go out the damping due to rotation coefficient C of eddy current damper
r, i.e. C
r=T/ ω.The design of the test configuration that the utility model mainly carries out for Measurement accuracy rotary torque T and rotational speed omega.
Shown in Figure 1, the utility model embodiment provides a kind of device (abbreviation proving installation) testing eddy current damper damping due to rotation coefficient, comprise base plate 18 and the tester bracket 19, the electric machine support 21 that are fixed on base plate 18 top, the top of tester bracket 19 is fixed with the tester 13 for testing rotary torque and rotating speed, the top of electric machine support 21 is fixed with motor 17 and reductor 16, motor 17 and reductor 16 are by driving mandrel 15 to be connected, and the axis of motor 17, reductor 16, tester 13 three is positioned on same level line.
The central horizontal of tester 13 is provided with tester mandrel 12, one end of this tester mandrel 12 is connected with the driving mandrel 15 of reductor 16 with for being connected motor 17 by the first shaft coupling 14, and the other end is connected with the damping shaft 8 for being connected with eddy current damper by the second shaft coupling 11.
Wherein, shown in Fig. 1 and Fig. 2, the outer cover of damping shaft 8 is provided with two positioning retainer ring 6, two positioning retainer rings 6 moved axially for limiting eddy current damper and is all fixed on damping shaft 8 by hold-down nut 5; The outside of damping shaft 8 is also arranged with wireless strain tester 10, and wireless strain tester 10 is connected with at least three cover three-dimensional foil gauges 9 by wire, and this three-dimensional foil gauge 9 is fixed on damping shaft 8 outside surface, and is uniformly distributed along damping shaft 8 circumference.This wireless strain tester 10 and three-dimensional foil gauge 9 are used for testing the stress distribution of damping shaft 8 hoop, if damping shaft 8 does pure twisting motion according to ideal operation state, then the strain value being positioned at the three-dimensional foil gauge 9 of damping shaft 8 diverse location should be substantially close; If the strain value of three-dimensional foil gauge 9 differs greatly, then illustrate that damping shaft 8 not only there occurs pure torsional deflection, and there occurs flexural deformation to a certain extent, under whole proving installation is in imperfect duty, need to carry out right alignment adjustment.
Shown in Figure 1, in order to regulate the right alignment of this proving installation, reducing the deviation of rotating and bringing, improving testing precision, tester 13 is fixed on tester bracket 19 by least 2 setting nuts 20.When the strain value by three-dimensional foil gauge 9 judges that proving installation is under imperfect duty, finely tune by setting nut 20 pairs of testers 13, make whole device in rotation process, ensure good right alignment, and then make proving installation be in desirable duty.In the present embodiment, setting nut 20 is four, and the longitudinal axis along tester 13 is symmetrical arranged, and makes the precision of fine setting higher, operates convenient.
In the present embodiment, proving installation also comprises the microcontroller (not shown) for controlling each parts, tester 13 inside is provided with moment of torsion acquisition module (not shown) and rotating speed acquisition module (not shown), and microcontroller is connected with motor 17, reductor 16, tester 13, wireless strain tester 10 respectively.In addition, shown in Figure 3, in order to better test the stress distribution of damping shaft 8 hoop, the outside surface of damping shaft 8 is evenly distributed with four cover three-dimensional foil gauges 9 along its circumference, by testing the strain value at 4 places, accurately can judge whether proving installation is in ideal operation state.
When utilizing the utility model device to carry out the test of damping due to rotation coefficient, concrete operations are as follows:
S1: building of test macro: mounted proving installation is connected with eddy current damper to be measured, forwards S2 to.
For two damped disc eddy current damper, during practical operation, the concrete steps of S1 are: on the damping shaft 8 of mounted proving installation, be set with a dampened disk 1 of eddy current damper to be measured, magnet fixed disc 2 and another dampened disk 1 successively, wherein, magnet fixed disc 2 is connected with damping shaft 8 by bearing 3, two dampened disks 1 are connected with damping shaft 8 by flat key 4, and base plate 18 is fixed in the bottom of magnet fixed disc 2, between magnet fixed disc 2 and two dampened disks 1, be respectively provided with the locating ring 7 for keeping spacing; On damping shaft 8 two positioning retainer ring 6 be close to respectively the outside of two dampened disks 1 and fix, two dampened disks 1 can not being moved along the axis of damping shaft 8 in rotation process, forwarding S2 to.
S2: the test working of test macro: start proving installation; Proving installation after startup drives eddy current damper not stall to be measured to move by damping shaft 8, rotates, forward S3 to until proving installation and eddy current damper to be measured all remain a constant speed.
During practical operation, the concrete steps of S2 are: starter motor 17, and motor 17 drives reductor 16 to rotate by driving mandrel 15, and after the deceleration by reductor 16, drive the rotating speed of mandrel 15 to reduce, output torque increases; Mandrel 15 is driven to drive the tester mandrel 12 of tester 13 to rotate by the first shaft coupling 14, tester mandrel 12 drives damping shaft 8 to rotate by the second shaft coupling 11, damping shaft 8 drives two of eddy current damper to be measured dampened disks 1 to rotate by flat key 4, the dampened disk 1 rotated relatively rotates with the permanent magnet on magnet fixed disc 2, produce eddy-current damping, and then form the rotation that damping torque hinders damping shaft 8; When damping torque is equal with the output power of motor 17, proving installation and eddy current damper to be measured all remain a constant speed and rotate, and forward S3 to.
S3: the debugging of test macro: utilize reductor 16 velocity of rotation of proving installation to be slowed down; Judge whether the strain value being positioned at the three-dimensional foil gauge 9 of damping shaft 8 outside surface diverse location differs by more than 2 μ ε, if so, illustrate that damping shaft 8 there occurs flexural deformation to a certain extent, whole proving installation is in imperfect duty, forwards S4 to; If not illustrate that pure torsional deflection only occurs damping shaft 8, whole device is in ideal operation state, forwards S5 to.
S4: the fine setting of tester: finely tuned by setting nut 20 pairs of testers 13, until under whole device is in ideal operation state, forward S5 to.
S5: the actual measurement of data: the rotary torque T of record tester 13 real-time testing and rotational speed omega, according to formula C
r=T/ ω, calculates corresponding damping due to rotation coefficient C
r.
During actual test, in order to improve accuracy and the reliability of test data, after S5, by changing motor 17 rotating speed, testing and calculating the damping due to rotation coefficient C organized more
r, as measured data reference.
The utility model is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present utility model; no matter but any change is done in its shape or structure; every have identical with the utility model or akin technical scheme, all within its protection domain.
Claims (6)
1. test the device of eddy current damper damping due to rotation coefficient for one kind, it is characterized in that: comprise base plate (18) and be fixed on tester bracket (19), the electric machine support (21) at base plate (18) top, the top of tester bracket (19) is fixed with the tester (13) for testing rotary torque and rotating speed, the top of electric machine support (21) is fixed with motor (17) and reductor (16), and motor (17) and reductor (16) are by driving mandrel (15) to be connected;
The central horizontal of tester (13) is provided with tester mandrel (12), one end of tester mandrel (12) is connected with described driving mandrel (15) by the first shaft coupling (14), and the other end is connected with the damping shaft (8) for being connected with eddy current damper by the second shaft coupling (11);
The outer cover of described damping shaft (8) is provided with two for limiting the positioning retainer ring (6) that eddy current damper moves axially, and two positioning retainer rings (6) are all fixed on damping shaft (8); The outside of damping shaft (8) is also arranged with wireless strain tester (10), wireless strain tester (10) is connected with at least three covers three-dimensional foil gauge (9), described three-dimensional foil gauge (9) is fixed on damping shaft (8) outside surface, and is uniformly distributed along damping shaft (8) circumference.
2. the device of test eddy current damper damping due to rotation coefficient as claimed in claim 1, is characterized in that: described tester (13) is fixed on tester bracket (19) by least 2 setting nuts (20).
3. the device of test eddy current damper damping due to rotation coefficient as claimed in claim 2, it is characterized in that: described setting nut (20) is four, four setting nuts (20) are symmetrical arranged along the longitudinal axis of tester (13).
4. the device of test eddy current damper damping due to rotation coefficient as claimed in claim 1, is characterized in that: the outside surface of described damping shaft (8) is evenly distributed with four cover three-dimensional foil gauges (9) along its circumference.
5. the device of test eddy current damper damping due to rotation coefficient as claimed in claim 1, is characterized in that: the inside of described tester (13) is provided with moment of torsion acquisition module and rotating speed acquisition module.
6. the device of the test eddy current damper damping due to rotation coefficient according to any one of claim 1 to 5, it is characterized in that: this device also comprises microcontroller, described microcontroller is connected with motor (17), reductor (16), tester (13), wireless strain tester (10) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520701136.5U CN205049331U (en) | 2015-09-10 | 2015-09-10 | Test device of electric eddy -current damper rotational damping coefficient |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520701136.5U CN205049331U (en) | 2015-09-10 | 2015-09-10 | Test device of electric eddy -current damper rotational damping coefficient |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205049331U true CN205049331U (en) | 2016-02-24 |
Family
ID=55342901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520701136.5U Withdrawn - After Issue CN205049331U (en) | 2015-09-10 | 2015-09-10 | Test device of electric eddy -current damper rotational damping coefficient |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205049331U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092236A (en) * | 2015-09-10 | 2015-11-25 | 中铁大桥科学研究院有限公司 | Device and method used for testing rotation damping coefficients of eddy current damper |
| CN106353076A (en) * | 2016-07-07 | 2017-01-25 | 大连海事大学 | Tester for determining dynamic characteristic coefficient of squeeze film damper |
-
2015
- 2015-09-10 CN CN201520701136.5U patent/CN205049331U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092236A (en) * | 2015-09-10 | 2015-11-25 | 中铁大桥科学研究院有限公司 | Device and method used for testing rotation damping coefficients of eddy current damper |
| CN105092236B (en) * | 2015-09-10 | 2017-12-22 | 中国铁路总公司 | A kind of device and method for testing eddy current damper damping due to rotation coefficient |
| CN106353076A (en) * | 2016-07-07 | 2017-01-25 | 大连海事大学 | Tester for determining dynamic characteristic coefficient of squeeze film damper |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160303 Address after: 100844 Fuxing Road, Beijing, Haidian District, No. 10 Patentee after: CHINA RAILWAY CORPORATION Patentee after: BRIDGE SCIENCE AND TECHNOLOGY INSTITUTE CO., LTD., CHINA RAILWAY ENGINEERING GROUP Patentee after: Group Co., Ltd., Zhongtie Daqiao Bureau Address before: 103 No. 430034 Hubei Province in Qiaokou District of Wuhan city road construction Patentee before: BRIDGE SCIENCE AND TECHNOLOGY INSTITUTE CO., LTD., CHINA RAILWAY ENGINEERING GROUP Patentee before: Group Co., Ltd., Zhongtie Daqiao Bureau |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20160224 Effective date of abandoning: 20171222 |
|
| AV01 | Patent right actively abandoned |