CN103868667B - A kind of automobile sheetsteel part Constrained mode test fixture and method - Google Patents
A kind of automobile sheetsteel part Constrained mode test fixture and method Download PDFInfo
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- CN103868667B CN103868667B CN201210535460.5A CN201210535460A CN103868667B CN 103868667 B CN103868667 B CN 103868667B CN 201210535460 A CN201210535460 A CN 201210535460A CN 103868667 B CN103868667 B CN 103868667B
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Abstract
A kind of automobile sheetsteel part Constrained mode test fixture, including three-back-shaped train wheel bridge and three-back-shaped lower plate, there is bolt hole the outer circle position of described three-back-shaped upper and lower clamping plate, for being fixed with the T-slot on floor by bolt；There is counter sink the inner circle position of three-back-shaped train wheel bridge, the inner circle position of three-back-shaped lower plate is to there being through hole, for plate to be measured is clamped between three-back-shaped upper and lower clamping plate, and three-back-shaped train wheel bridge, plate to be measured and three-back-shaped lower plate are connected fixing by screw.The present invention selects power hammer exciting force as pumping signal, is arranged in the acceleration transducer pickup response signal of plate surface to be measured by the analyzing and processing recording signal obtains mode during plate restrained condition to be measured.In the present invention, plate to be measured is by the way of bolt is connected with fixture so that it is be in clamping restrained condition, the stressing conditions of automobile-used plate in virtual condition.The Constrained mode of plate to be measured when this method of testing can accurately measure restrained condition, it addition, theory support can be provided to the selection of body panel structure and plate Analysis of Vibration Characteristic.
Description
Technical field
The present invention relates to automobile vibration field tests, especially a kind of plate Constrained mode measuring technology.
Background technology
Auto panel acoustic enviroment on automobile passenger chamber interior under external exciting force effect has important impact, surveys
The modal distribution of examination restrained condition lower plate, by adjusting the partial structurtes of plate or selecting to paste suitable automobile-used damping material
Material, can effectively suppress the vibration of plate and reduce radiation sound in car, thus improving the acoustic enviroment of automobile passenger chamber interior.
At present, the automobile sheetsteel part mode testing method under test restrained condition has two kinds: power hammer advocate approach and vibrator advocate approach.Again
In some cases, vibrator cannot be arranged or combine practical situation and arrange difficulty, therefore in view of test fixture and ground
Fixed form, employing power hammer advocate approach test constraint plate mode.
Summary of the invention
The technical problem to be solved is a kind of automobile sheetsteel part Constrained mode test fixture and method, makes firmly
Hammer exciting force is as exciting source, it is possible to preferably test out the constraint plate translation mode along tri-directions of X, Y, Z.
The technical scheme is that and be achieved in that:
A kind of plate Constrained mode test fixture, it includes three-back-shaped train wheel bridge and three-back-shaped lower plate, described three-back-shaped
There is bolt hole the outer circle position of upper and lower clamping plate, for being fixed with the T-slot on floor by bolt；Three-back-shaped train wheel bridge
Inner circle position have counter sink, the inner circle position of three-back-shaped lower plate is to there being through hole, for being clamped in by test plate
Between three-back-shaped upper and lower clamping plate, and by screw, three-back-shaped train wheel bridge, test plate and three-back-shaped lower plate are connected fixing.
Method of testing makes firmly to hammer into shape pumping signal as driving source, specifically comprises the following steps that
Step 1: plate to be measured is installed and is clamped on test fixture, is fixed on test fixture in the T-slot of ground, inspection
Look into and ensure that plate to be measured and fixture, fixture and ground T-slot are in retraining clamped condition.
Step 2: select modal response test point on automobile sheetsteel part.Flat board plate test point is uniformly distributed；Right
In floating screed plate, while test point is uniformly distributed, ensures that test point is positioned in floating screed structure as far as possible, and measures test point
Coordinate sets up test model.
Step 3: three-way vibration transducer arrangements at each response test point of plate to be measured, vibrating sensor is connected
Line is sling and fixes, it is to avoid connecting line wobble effects plate vibration signal during test.
Step 4: select the center of plate planar central and test fixture as power input point and to carry out labelling, it is ensured that
Power hammer energized position is constant.
Step 5: the mode of power hammer exciting test plate, ensures during test that same energized position input power is in the same size, choosing
Take at least 5 preferable frequency response curves of concordance and power attenuation curve preserves.
Step 6: the ImpactTesting module of application LMS carries out data analysis, obtains testing the Mode Shape of plate.
In the present invention, plate to be measured is by the way of bolt is connected with fixture so that it is be in clamping restrained condition, close to real
The stressing conditions of automobile-used plate in the state of border.On the one hand, the pact of plate to be measured when this method of testing can accurately measure restrained condition
Bundle mode；On the other hand, theory support can be provided to the selection of body panel structure and plate Analysis of Vibration Characteristic.
The present invention uses power hammer exciting force test automobile sheetsteel part mode of oscillation, pays close attention to 20Hz-500Hz band limits inner panel
The vibration shape of part, and sample frequency uses 0Hz to 1024Hz, it is ensured that the frequency paid close attention in band limits can have enough excitation energies
Amount, plate mode of oscillation can encourage out.
Accompanying drawing explanation
Figure 1A and Figure 1B is fixture and plate installation diagram to be measured；
Fig. 2 three-back-shaped train wheel bridge figure；
Fig. 3 three-back-shaped lower plate figure (parameter is with three-back-shaped train wheel bridge)；
Fig. 4 floating screed to be measured plate (reinforcement width 30mm, deep 6mm)；
Fig. 5 retrains floating screed plate frequency response figure.
Detailed description of the invention
The present invention is elaborated below in conjunction with instantiation.It should be noted that these examples be merely to illustrate the present invention and need not
In limiting the scope of the present invention.It is further noted that after having read the content of present invention statement, those skilled in the art can
To make various changes or modifications the present invention, these equivalent form of values fall within the model that the application appended claims is limited equally
Enclose.
Seeing Fig. 1-Fig. 4, fixture is made up of three-back-shaped upper and lower clamping plate 1 and 3.The outer circle of three-back-shaped upper and lower clamping plate is uniform
M20 through hole that a circle stamp out is distributed.Three-back-shaped train wheel bridge 1 uniformly stamps out the counter sink of M8, Back Word in inner circle position
Shape lower plate 3 stamps out the through hole of M8 in inner circle position.Outer the making a circle of each plate to be measured 2 stamps out the through hole of M8.Return
The outer ring a size of 840mm*840mm of the upper and lower clamping plate of font, three-back-shaped upper and lower clamping plate inner ring a size of 680mm*680mm, treat
Drafting board part a size of 750mm*750mm.During test, plate 2 to be measured is clamped with three-back-shaped upper and lower clamping plate 1 and 3, uses M8 bolt
Sequentially pass through three-back-shaped train wheel bridge 1, plate to be measured 2 and three-back-shaped lower plate 3 from top to bottom, and ensure that plate to be measured is in clamping
State.It addition, sequentially pass through three-back-shaped upper and lower clamping plate from the bottom up with the T-bolt of M20, the T connector of T-bolt is placed in
In the T-slot on ground, T-bolt other end nut screwing clamping, by T-bolt by the whole Back Word already at clamped condition
The upper and lower clamping plate of shape are fixed in the T-slot of ground together with plate to be measured.This T-slot is the metal T-slot that ground is inlayed, every two
The spacing of individual T-slot is 135mm.
The following is test process, the test system that this example uses is that the Test.Lab multichannel vibration of Belgium LMS is surveyed
Test system.
Step 1: test plate is installed and is clamped on test fixture, test fixture is fixed in the T-slot of ground, inspection
Look into and ensure that plate to be measured and fixture, fixture and ground T-slot are in retraining clamped condition.
Step 2: in plate to be measured (the floating screed plate of 750mm*750mm) upper selection modal response test point, and measure survey
The coordinate of pilot sets up test model.For floating screed plate, while test point is uniformly distributed, ensure that test point is positioned at as far as possible
In floating screed structure, arrange 36 response test points altogether.
Step 3: three-way vibration transducer arrangements at the response test point of plate to be measured, vibrating sensor connecting line is hung
Rise and be fixed on spider, it is to avoid connecting line wobble effects plate vibration signal during test.
Step 4: select the center of plate planar central and test fixture as power input point and to carry out labelling, it is ensured that
Power hammer energized position is constant.In Fig. 1, arrow 4,5 pointed location is power hammer excitation point.
Step 5: firmly hammer the mode of exciting test plate into shape, ensures during test that same energized position input power is in the same size,
Choose at least 5 preferable frequency response curves of concordance and power attenuation curve preserves.If Fig. 5 is the frequency response curve that test obtains.
Step 6: the ImpactTesting module of application LMS is acquired and analyzing and processing data.Inspection data are without exception
After, plate test Data Post obtains frequency response transmission function (FRF) figure in PloyMAX, by modal idenlification, permissible
Obtain testing the Mode Shape of plate.
Claims (1)
1. a plate Constrained mode method of testing, plate Constrained mode test fixture includes three-back-shaped train wheel bridge (1) and Back Word
Shape lower plate (3), there is bolt hole the outer circle position of described three-back-shaped upper and lower clamping plate, for by bolt and the T on floor
Shape groove is fixed；There is counter sink the inner circle position of three-back-shaped train wheel bridge, the inner circle position of three-back-shaped lower plate to there being through hole,
For plate to be measured is clamped between three-back-shaped upper and lower clamping plate, and by screw by three-back-shaped train wheel bridge, plate to be measured and Back Word
Shape lower plate connects fixing；
Plate Constrained mode method of testing, is to make firmly to hammer into shape pumping signal as driving source, specifically comprises the following steps that
Step 1: plate to be measured is installed and is clamped on test fixture, is fixed on test fixture in the T-slot of ground, checks also
Ensure that plate to be measured and fixture, fixture and ground T-slot are in retraining clamped condition；
Step 2: select modal response test point on plate: for flat board plate, modal response is surveyed test point and is uniformly distributed；Right
In floating screed plate, survey while test point is uniformly distributed in modal response and ensure that test point is positioned in floating screed structure as far as possible；Measure
Modal response is surveyed the coordinate of test point and is set up test model；
Step 3: three-way vibration transducer arrangements in each modal response test point of plate to be measured, sensor connecting line is hung
Rise and fix, it is to avoid connecting line wobble effects plate vibration signal during test；
Step 4: select the center of plate planar central and test fixture as power input point and to carry out labelling, it is ensured that power is hammered into shape
Energized position is constant；
Step 5: firmly hammer the mode of exciting test plate into shape, ensures during test that same energized position input power is in the same size, chooses
At least 5 preferable frequency response curves of concordance and power attenuation curve preserve；
Step 6: the ImpactTesting module of application LMS carries out data analysis, obtains testing the Mode Shape of plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210535460.5A CN103868667B (en) | 2012-12-12 | 2012-12-12 | A kind of automobile sheetsteel part Constrained mode test fixture and method |
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| CN201210535460.5A CN103868667B (en) | 2012-12-12 | 2012-12-12 | A kind of automobile sheetsteel part Constrained mode test fixture and method |
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| CN103868667B true CN103868667B (en) | 2016-08-10 |
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| CN104374500A (en) * | 2014-09-26 | 2015-02-25 | 天津大学 | Adjustable template fixing device for studying multipoint seismic oscillation through dynamic photoelastic method |
| CN106289688B (en) * | 2016-07-22 | 2018-12-11 | 西安航空制动科技有限公司 | The test method of antiskid brake control device vibratory response |
| CN106248332B (en) * | 2016-08-31 | 2019-02-15 | 重庆长安汽车股份有限公司 | Test the test-bed and method of clamped Vibration of Rectangular Plates and acoustic radiation |
| CN106840697A (en) * | 2017-01-16 | 2017-06-13 | 同济大学 | The determination method that body side wall cavity blocking block influences on vehicle low-frequency structure vibration |
| CN107356390A (en) * | 2017-08-15 | 2017-11-17 | 大连理工大学 | A kind of thin plate vibration laboratory holder |
| CN107817150A (en) * | 2017-12-06 | 2018-03-20 | 岭南师范学院 | Devices and methods therefor prepared by a kind of curvature method residual stress test sample |
| CN112161799B (en) * | 2020-09-30 | 2022-10-04 | 武汉科技大学 | Flexible plate strip modal test platform and use method thereof |
| CN113155387B (en) * | 2021-03-30 | 2023-12-01 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Method for preparing universal box type skin antenna vibration test clamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4912980A (en) * | 1988-12-05 | 1990-04-03 | Team Corporation | Modular test fixture for vibration and shock testing |
| FR2675577B1 (en) * | 1991-04-22 | 1994-03-04 | Sextant Avionique | DEVICE FOR THE EXPERIMENTAL MODAL ANALYSIS OF A STRUCTURE. |
| WO2007009460A1 (en) * | 2005-07-15 | 2007-01-25 | Structural Vibrations Solutions A/S | Robust algorithms for experimental modal analysis |
| CN201429494Y (en) * | 2009-06-05 | 2010-03-24 | 中国第一汽车集团公司 | Elastic supporting device for modal test |
| CN201569554U (en) * | 2009-12-31 | 2010-09-01 | 重庆大学 | Integrated modality analyzer |
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