CN109341992A - A kind of experimental provision for vibration mechanics modal test - Google Patents
A kind of experimental provision for vibration mechanics modal test Download PDFInfo
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- CN109341992A CN109341992A CN201811294663.3A CN201811294663A CN109341992A CN 109341992 A CN109341992 A CN 109341992A CN 201811294663 A CN201811294663 A CN 201811294663A CN 109341992 A CN109341992 A CN 109341992A
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- fixture
- supporting rod
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- experimental provision
- vibration
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- 238000012360 testing method Methods 0.000 title claims abstract description 33
- 238000002474 experimental method Methods 0.000 claims abstract description 42
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/027—Specimen mounting arrangements, e.g. table head adapters
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The present invention relates to modal test techniques, specially a kind of experimental provision for vibration mechanics modal test, including experimental model, fixture, base posts and experiment pedestal bottom plate, wherein rectangular hole slot is arranged in the both ends of experimental model, fixture is equipped with two groups, every group of fixture includes block and supporting rod on fixture, the supporting rod cross section of first group of fixture be it is rectangular, the supporting rod cross section of second group of fixture is circle；Block passes through supporting rod and connect with experimental model on the fixture of every group of fixture, and the supporting rod of square cross section is matched with the size of rectangular hole slot, and the supporting rod of circular cross section form of cutting within rectangular hole slot combines；Block is mutually fixed with base posts on fixture；Base posts are connected with experiment pedestal bottom plate.The experimental provision can flexibly change experiment condition, be easy for installation and removal.
Description
Technical field
The present invention relates to modal test technique, specially a kind of experimental provision for vibration mechanics modal test.
Background technique
Modal test is also known as test modal analysis, to determine that the vibration that the modal parameter of linear vibrating system is carried out tries
It tests.Test modal analysis mainly passes through mode experiment, the vibration response signal of measuring system, or the excitation of measuring system simultaneously
Signal, response signal, from the signal measured, the modal parameter of identification description system dynamic feature.Modal parameter is in frequency
To a kind of description of vibrational system inherent characteristic, the generally referred to as intrinsic frequency of system, damping ratio, the vibration shape and mode in rate domain
Quality etc..
Common modal test is motivated using vibration excitor to geodesic structure, is treated geodesic structure and is generated an exciting force, acquisition to
Parameters variation of the geodesic structure under vibration excitor carries out model analysis, to obtain the dynamic characteristics to geodesic structure.But it is traditional
The experiment condition (such as boundary condition, exciting mode) of modal test device is single, generallys use that one end is clamped, one end freely hangs
Arm configuration and single-point or the mode of fixed point excitation；The change and disassembly of the way of restraint of another aspect experimental provision are also compared
It is complicated；Impacting point is often because the fixation of excitational equipment also becomes relatively single, it has not been convenient to change the energized position of vibration excitor；Design
Complexity, processing cost are high.
Summary of the invention
To solve technical problem present in the prior art, the present invention provides a kind of reality for vibration mechanics modal test
Experiment device, the experimental provision can flexibly change experiment condition, be easy for installation and removal.
The present invention is realized using following technical scheme: for the experimental provision of vibration mechanics modal test, including experiment
Model, fixture, base posts and experiment pedestal bottom plate, wherein rectangular hole slot is arranged in the both ends of experimental model, and fixture is equipped with two groups, often
Group fixture includes block and supporting rod on fixture, and the supporting rod cross section of first group of fixture is rectangular, the clamping of second group of fixture
Bar cross section is circle；
Block passes through supporting rod and connect with experimental model on the fixture of every group of fixture, the supporting rod of square cross section with it is rectangular
The size of hole slot matches, and the supporting rod of circular cross section form of cutting within rectangular hole slot combines；
Block is mutually fixed with base posts on fixture；Base posts are connected with experiment pedestal bottom plate.
Preferably, the base posts include top base column and bottom base column, and top base column and bottom base column pass through shank of bolt
Connection.Block is mutually fixed by bolt with top base column on the fixture.
Preferably, the experimental model is horizontal experiment girder steel, and the fixture is beam-ends fixture.
Preferably, the experiment pedestal bottom plate is equipped with multiple threaded holes for fixing vibration excitor clamping device.It is described
Vibration excitor clamping device is bolted on threaded hole, or the setting of the slideway by being mounted on threaded hole is in experiment base
On seat bottom plate.
As can be known from the above technical solutions, the experimental provision for the vibration mechanics modal test that the present invention designs, main component are
Level experiment girder steel, beam-ends fixture (block and supporting rod on fixture), height-adjustable base posts and experiment pedestal bottom plate, structure
Simply, easy to disassemble, shape applicability is good, experiment condition flexibly changing.Compared with prior art, the present invention has following excellent
Point and the utility model has the advantages that
1, the both ends for testing girder steel are respectively equipped with rectangular hole slot, can be according to requirement of experiment, by selecting supporting rod section
Shape (round or rectangular) realizes the fixation side that test girder steel end different with the combining form of experiment girder steel square hole slot cross-section
Formula；The constraint condition that experiment girder steel can also freely be changed, removes the constraint support of one end, becomes cantilever experiment girder system system.
It 2, can be according to the height of wind-tunnel for the modal test of wind-induced vibration since the height of base posts is adjustable on the whole
To adjust the height of experimental provision.
3, it tests on pedestal bottom plate and is reserved with threaded hole, on the one hand convenient for the installation site of change vibration excitor, that is, change and swash
Position is encouraged, in the experiment for studying influence of the different energized positions to the identifiability of system, can be changed according to experimental conditions
Become the different location of excitational equipment to realize；On the other hand, multiple exciter supports can be placed on experiment pedestal bottom plate to be equipped with
Multiple vibration excitors, to realize the Modal Parameter Identification of multiple entry system.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the structural schematic diagram of circular clamp bar；
Fig. 3 is the structural schematic diagram of rectangular supporting rod；
Fig. 4 is the structural schematic diagram of block on fixture；
Wherein, 1- level tests girder steel；2- top base column；Block on 3- fixture；4- tests pedestal bottom plate；5- supporting rod；6-
Bottom base column；7- shank of bolt；8- vibration excitor clamping device；9- circle duct.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Embodiment
As shown in Figure 1, the present invention includes experimental model (the horizontal experiment girder steel 1 of the present embodiment choosing), beam-ends fixture, is adjusted
The base posts and experiment pedestal bottom plate 4 of height, wherein horizontal experiment girder steel both ends pre-set rectangular hole slot, beam-ends fixture is set
There are two groups, every group of beam-ends fixture includes block 3 and supporting rod 5 on fixture, and the supporting rod cross section of first group of beam-ends fixture is side
Shape, the supporting rod cross section of second group of beam-ends fixture are circle, are provided with the spiral shell to match with nuts in clamping boom end
Line, as shown in Figure 2,3.
Block passes through supporting rod and nuts and connect with level experiment girder steel on the fixture of every group of beam-ends fixture, square cross
The supporting rod in face is matched with the size of rectangular hole slot, is cut form within the supporting rod of circular cross section and rectangular hole slot and is mutually tied
It closes.When the supporting rod of square cross section is when rectangular hole slot combines blending bolt and tightens, the end of experiment girder steel is limited
It shifts up and rotates in the side XY, to form the clamping form of clamped seat (fixing end support).When the clamping of circular cross section
When rectangular hole slot combines blending bolt and tightens, only the end of limitation experiment girder steel shifts up bar in the side XY, but can be around circle
Shape supporting rod rotation, to form the clamping form of hinged-support (fixed-hinged support).
General fixing end support is defined as that component support end can be prevented to generate vertically movable and move left and right and prevent
Component generates the support of rotation, and the rectangular supporting rod of fixing end support designed by the present invention is combined with the rectangular hole slot of girder steel
Form.General fixed-hinged support is defined as component and couples with the smooth cylindrical hinge of support, and component cannot be generated along any side
To movement, but can rotate around central axis, fixed-hinged support designed by the present invention is circular clamp bar and girder steel square hole
The form that slot combines.
Height-adjustable base posts include top base column 2 and bottom base column 6, and top base column is set in advance with bottom base column
Screw thread is set, top base column is connect with bottom base column by four shanks of bolt 7, and adjusts base posts on the whole by shank of bolt
Height.In the present embodiment, block is mutually fixed by four bolts with top base column on fixture, and block pre-sets circle on fixture
Shape duct 9 is in conjunction with supporting rod, as shown in Figure 4.The present invention by adjusting connect up and down base posts shank of bolt and nut, thus
Change the height of experimental model indirectly；Top base column can also be removed, directly block on fixture is connected with bottom base column, thus
Significantly alter the height of experimental model.
Pedestal bottom plate is same uses four to be bolted with experiment for base posts.It tests pedestal bottom plate and is equipped with and swash for fixed
Multiple threaded holes of vibration device clamping device 8 (i.e. exciter support) can according to need and change vibration excitor clamping device along girder steel
Horizontally position, to change the position of modal test excitation point (i.e. vibration excitor).Testing pedestal bottom plate can be according to experiment
Demand places multiple exciter supports and is equipped with multiple vibration excitors, realizes the Modal Parameter Identification of multiple entry system.Experimental model (this
Embodiment is horizontal experiment girder steel) intrinsic frequency can be realized by switching different types of model, in this experimental provision
In equally can achieve this effect.
In addition, vibration excitor (can use spiral shell by the fixed point in the present embodiment is mobile in the mobile form of experiment pedestal bottom plate
Bolt is fixed on threaded hole) become the form that slideway moves (slideway is mounted on threaded hole).The experimental provision can be used for not
With the shaking platform of exiting form.
As seen from the above embodiment, which relates generally to vibration mechanics modal test, can be used for wind excited vibration
The shaking platform of experiment porch or other driving sources, structure is simple, easy to disassemble, and shape applicability is good, widely applicable, and has
Certain rigidity, stability, which has, to be ensured.The method of clamping of its experimental model can be changed in the experimental provision, mainly passes through experiment
The rectangular hole slot at girder steel both ends and the supporting rod of different cross section shape are assembled, and will test girder steel model and folder by nut
Bar is held to fix；When rectangular hole slot is in conjunction with circular cross-section supporting rod, reach hinged effect；When rectangular hole slot and square-section press from both sides
When holding bar combination, reach clamped effect.The intrinsic frequency for changing its experimental model if necessary simultaneously, can use experiment pedestal
The threaded hole reserved on bottom plate, the horizontal distance between base posts to change experiment pedestal bottom plate both ends；Pedestal can also be used
The threaded hole reserved on bottom plate changes the position of vibration excitor, and then Controlling model forced position.In addition, the height of base posts can be with
It is adjusted by four shanks of bolt and nut.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (7)
1. a kind of experimental provision for vibration mechanics modal test, which is characterized in that including experimental model, fixture, base posts
With experiment pedestal bottom plate, wherein rectangular hole slot is arranged in the both ends of experimental model, and fixture is equipped with two groups, and every group of fixture includes fixture
Upper piece and supporting rod, the supporting rod cross section of first group of fixture be it is rectangular, the supporting rod cross section of second group of fixture is circle；
Block passes through supporting rod and connect with experimental model on the fixture of every group of fixture, the supporting rod of square cross section and rectangular hole slot
Size match, the supporting rod of circular cross section form of cutting within rectangular hole slot combines；
Block is mutually fixed with base posts on fixture；Base posts are connected with experiment pedestal bottom plate.
2. the experimental provision according to claim 1 for vibration mechanics modal test, which is characterized in that the base posts
Including top base column and bottom base column, top base column is connect with bottom base column by shank of bolt.
3. the experimental provision according to claim 2 for vibration mechanics modal test, which is characterized in that on the fixture
Block is mutually fixed by bolt with top base column.
4. the experimental provision according to claim 1 for vibration mechanics modal test, which is characterized in that the experiment mould
Type is horizontal experiment girder steel, and the fixture is beam-ends fixture.
5. the experimental provision according to claim 1 for vibration mechanics modal test, which is characterized in that the experiment base
Seat bottom plate is equipped with multiple threaded holes for fixing vibration excitor clamping device.
6. the experimental provision according to claim 5 for vibration mechanics modal test, which is characterized in that the vibration excitor
Clamping device is bolted on threaded hole.
7. the experimental provision according to claim 5 for vibration mechanics modal test, which is characterized in that the vibration excitor
Clamping device is arranged on experiment pedestal bottom plate by the slideway being mounted on threaded hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811294663.3A CN109341992A (en) | 2018-11-01 | 2018-11-01 | A kind of experimental provision for vibration mechanics modal test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811294663.3A CN109341992A (en) | 2018-11-01 | 2018-11-01 | A kind of experimental provision for vibration mechanics modal test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109341992A true CN109341992A (en) | 2019-02-15 |
Family
ID=65313308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811294663.3A Pending CN109341992A (en) | 2018-11-01 | 2018-11-01 | A kind of experimental provision for vibration mechanics modal test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231135A (en) * | 2019-07-12 | 2019-09-13 | 南昌航空大学 | A kind of grip device of liftable beam damping experiment |
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|---|---|---|---|---|
| GB369446A (en) * | 1931-04-28 | 1932-03-24 | Brooks J B & Co Ltd | Improvements relating to clamping bolts for the attachment clips of cycle, motor-cycle and like saddles |
| US6283425B1 (en) * | 1998-03-03 | 2001-09-04 | Allgon Ab | Mounting bracket |
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| CN202057468U (en) * | 2011-04-27 | 2011-11-30 | 兰州大学 | Vibration control table for multifunctional fixture beam |
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| CN103149077A (en) * | 2013-02-22 | 2013-06-12 | 西华大学 | Experiment platform for material mechanics |
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2018
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|---|---|---|---|---|
| GB369446A (en) * | 1931-04-28 | 1932-03-24 | Brooks J B & Co Ltd | Improvements relating to clamping bolts for the attachment clips of cycle, motor-cycle and like saddles |
| US6283425B1 (en) * | 1998-03-03 | 2001-09-04 | Allgon Ab | Mounting bracket |
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| CN106644443A (en) * | 2016-12-23 | 2017-05-10 | 南京工程学院 | Clamping base device of hollow flange steel beam stabilization test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231135A (en) * | 2019-07-12 | 2019-09-13 | 南昌航空大学 | A kind of grip device of liftable beam damping experiment |
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