CN1877280A - Resonance device for vibration experiment - Google Patents
Resonance device for vibration experiment Download PDFInfo
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- CN1877280A CN1877280A CN 200610039809 CN200610039809A CN1877280A CN 1877280 A CN1877280 A CN 1877280A CN 200610039809 CN200610039809 CN 200610039809 CN 200610039809 A CN200610039809 A CN 200610039809A CN 1877280 A CN1877280 A CN 1877280A
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Abstract
Disclosed is a resonant device applied in vibration test. The device comprises an additive working table fixed on the surface of a vibration table or a bounce table. The main body of the additive working table is a rigid table, which top surface is the additive table for setting testing component; around the bottom of the table are equipped with mounting pads, the middle part of the table is hung in the air relative to the mounting pad plane; the natural first resonance frequency or multiple resonance frequency of the rigid table is greater than the natural resonance frequency of the vibration table or the bounce table. The invention has the advantages that it can improve the range of testing frequency by installing resonance device.
Description
Technical field
The present invention relates to vibration or impact test apparatus in the environmental mechanics test, particularly a kind of and shaking table or shock testing machine combination are used to improve the resonance device of operating frequency range.
Background technology
In the test of current shock response, general at the highest frequency that can accomplish on the electric vibration table about 3000Hz, if want to improve frequency of operation, because the restriction of system's highest frequency (the single order natural resonance frequency of existing electric jigging platform moving coil is about 2200Hz), tangible energy attenuation phenomenon after 3000Hz, will occur, not satisfy the requirement that some shock response spectrum high fdrequency components reach the 4000Hz test.
Shock response spectrum is to realize the simulation pyroshock environment for electric vibration table to provide a kind of effective online time domain to synthesize collection of illustrative plates.General aviation device needs higher requirement at high band, as carry-on electronic equipment, needs the simulated flight device to make this environment of supersonic flight in the high-altitude, examines the ability to bear of electronic equipment under the dither situation.
In the prior art, shock response spectrum uses on electric vibration table and two kinds of stage bodies of mechanical vibration generator system.Wherein, shock response spectrum is the simulation pyroshock environment on electric vibration table.Energy generally concentrates on 5Hz in the 3000Hz scope on this electric vibration table, if want to accomplish more than the 3000Hz, because the system's highest frequency restriction that is put to the test is difficult to break through.Shock response can only be done the test of some low frequencies on mechanical vibration generator system, as the environmental simulation of falling, jolting or the like to some packing of product.Want to improve frequency of operation,, hardly may owing to limited by system's natural resonance frequency.
Summary of the invention
The invention provides a kind of resonance device that is used for vibration test, its objective is and on the shaking table or shock testing machine basis of existing, same performance, to improve the operating frequency range of test by resonance device is installed, thereby to improve the vibration test ability.
For achieving the above object, the technical solution used in the present invention is: a kind of resonance device that is used for vibration test, form by an additional work platform that is fixed on shaking table or the shock testing machine work top, the main body of this additional work platform is a rigidity platen, its end face is for settling the additional mesa of test specimen, be provided with supporting pad around the platen bottom surface, the relative supporting pad of platen center section baseplane is unsettled, the intrinsic single order resonance frequency of described rigidity platen or the natural resonance frequency of multi-mode resonance frequencies＞shaking table or shock testing machine work top.
Related content in the technique scheme is explained as follows:
1, in the such scheme, described shaking table comprises electric vibration table, mechanical vibration generator system and hydraulic vibration gen.Described multi-mode resonance frequencies is meant the resonance frequency that rigidity platen single order is above, general second order resonance frequency is the twice of single order resonance frequency, three rank resonance frequencies are three times of single order resonance frequency, and the quadravalence resonance frequency is four times of single order resonance frequency, by that analogy.
2, in the such scheme, why can improve the operating frequency range of test, be by the decision of the natural resonance frequency of additional work platform, and factors such as the material stiffness of additional work platform, thickness and shape have determined self natural resonance frequency.Now be given in the make decision formula of additional work platform natural resonance frequency of circular and two kinds of situations of square:
(1), described rigidity platen is circular platen, multistage natural resonance frequency be single order natural resonance frequency correspondence exponent number doubly, its single order natural resonance frequency as shown in the formula:
In the formula:
ω
n-single order natural resonance frequency, the rad/s of unit;
a
NS-vibration shape constant, counting N and pitch circle with the joint diameter, to count S relevant, and its numerical value is selected from following table:
" mechanical design handbook " (Xu Hao chief editor) the 1st volume of China Machine Press's in September, 1991 Beijing first published, the 6th piece, the basic data of chapter 1 mechanical vibration, 6-23 page or leaf are seen in numerical value in the above form and selection;
The circular platen suspension area of R-radius (suspension area be meant that platen supports after, center section is by unsettled zone), the m of unit;
The E-elastic modulus, the Pa of unit;
The t-thickness of slab, the m of unit;
μ-Poisson ratio;
ρ
A-mass area ratio, units/m
2
(2), described rigidity platen is square platen, multistage natural resonance frequency be single order natural resonance frequency correspondence exponent number doubly, its single order natural resonance frequency as shown in the formula:
ω
n-single order natural resonance frequency, the rad/s of unit;
A-vibration shape constant, select one of following eight kinds:
a)35.99；b)73.41；c)108.27；d)131.64；
e)132.25；f)164.99；g)165.15；h)243.11；
" mechanical design handbook " (Xu Hao chief editor) the 1st volume of China Machine Press's in September, 1991 Beijing first published, the 6th piece, the basic data of chapter 1 mechanical vibration, 6-24 page or leaf are seen in above numerical value and selection;
The b-square platen suspension area length of side (suspension area be meant that platen supports after, center section is by unsettled zone), the m of unit;
The E-elastic modulus, the Pa of unit;
The t-thickness of slab, the m of unit;
μ-Poisson ratio;
ρ
A-mass area ratio, units/m
2
Here it is emphasized that: platen of the present invention is not limited to circular and two kinds of situations of square, and adopts other geometric configuration also to be fine, such as five prismatics, six prismatics, rectangle, and ellipse etc.
3, in the such scheme, how to be fixed on shaking table or the shock testing machine table top, following dual mode arranged about the additional work platform:
(1), directly fixing
The rigidity platen is fixedly connected on shaking table or the shock testing machine work top by supporting pad.Fix and to adopt bolt fastening structure.
(2), indirect securement
The rigidity platen is fixedly connected on the unitor by supporting pad, and this unitor is fixedly connected on shaking table or the shock testing machine work top again.Described unitor is also wanted rigid material.
4, in the such scheme, described rigidity platen is preferably selected light weight, and the metal material that rigidity is big is such as being made by magnesium or aluminium or magnalium material.
5, in the such scheme, described supporting pad can adopt the bakelite bar.
The principle of the invention is: make additional work platform center section with certain rigidity unsettled, elastic deformation by the additional work platform, the savings certain energy, the high band energy is compensated, energy attenuation speed is slack-off, thereby reach on the electric vibration table of identical performance, high-band frequency obtains amplifying.Now can do following analysis by accompanying drawing 5 simple principle synoptic diagram:
In above-mentioned Fig. 5 waveform synoptic diagram, curve A is not use the generally resulting waveform of this programme resonance device, when frequency reaches f
1The time energy attenuation, waveform begins to move towards trough by crest.Generally can define f
1Moving-coil (movable member) first axial resonance frequency for electric vibration table; Curve B is to add this programme resonance device gained waveform, and frequency is at f
1After waveform is reduced slightly by crest during the left and right sides, be raised to crest again, when frequency arrives f
2Back waveform just begins the trough that moves towards slowly.f
2Be defined as this resonance device and moving-coil resonant frequency point.Why producing this phenomenon is because the elastic deformation of additional work platform is replenished energy, thereby makes high-frequency resonant point amplify.
Because the utilization of technique scheme, the present invention compared with prior art has the following advantages and effect:
1, the present invention has overcome existing electric vibration table after reaching certain frequency, limited by electric vibration table system highest frequency, does not satisfy the requirement of some tests, particularly to the test specimen of ask for something shock response spectrum high fdrequency component up to the 4000Hz test.And after the present invention and the electric vibration table combination, can improve test frequency, thus improving the shock response spectrum ability, effect is fairly obvious.
2, the present invention is simple in structure, be skillfully constructed, especially the natural resonance frequency of rigidity platen and the natural resonance frequency of jigging platform moving coil or shock testing machine table top are superposeed, when the natural resonance frequency of rigidity platen reaches the given frequency of a certain design, resonance by rigidity platen and moving-coil, can effectively improve operating frequency range, just improve the high-frequency resonant point, thereby improve the vibration test ability.
Description of drawings
The resonance device that accompanying drawing 1 improves the shock response spectrum ability for the present invention is fixed in the example structure synoptic diagram of electric vibration table;
Accompanying drawing 2 is an embodiment of the invention additional work platform structural drawing;
Accompanying drawing 3 is embodiment of the invention joiner structure figure;
Accompanying drawing 4 is supporting pad synoptic diagram of the present invention;
Accompanying drawing 5 is shock response spectrum principle schematic of the present invention;
Accompanying drawing 6 is not for using shock response spectrum design sketch of the present invention;
Accompanying drawing 7 is for using shock response spectrum design sketch of the present invention;
The sketch that accompanying drawing 8 is square platen for rigidity platen of the present invention, among the figure, eight kinds of respectively corresponding eight vibration shape constant a of concrete form;
The sketch that accompanying drawing 9 is circular platen for rigidity platen of the present invention.
In the above accompanying drawing, 1, the additional work platform; 2, supporting pad; 3, unitor; 4, test specimen; 5, vibration table surface; 6, shaking table stage body; 7, socket head cap screw; 8, socket head cap screw.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described:
Embodiment: referring to Fig. 1～shown in Figure 4, a kind of resonance device that is used for vibration test is made up of an additional work platform 1, supporting pad 2 and unitor 3 three parts.The shaking table that is used is the DC-3000-36 electric vibration table that our company produces, and the single order natural resonance frequency of electric jigging platform moving coil is at 2200Hz, and the highest frequency that can accomplish is about 3000Hz.
Additional work platform 1 is a rigidity platen, and its end face is provided with supporting pad 2 for settling the additional mesa of test specimen 4 around the platen bottom surface, and the relative supporting pad of platen center section 2 baseplanes are unsettled.Described rigidity platen adopts square platen, and its single order natural resonance frequency is calculated as follows:
Select material: aluminium
E-elastic modulus: 68Gpa
μ-Poisson ratio: 0.35
t＝50mm
ρ
A＝2.7×10
3kg/m
3
a＝243.11
b＝800mm
ω=2 π f are f=ω/2 π then
＝6572/2π
＝1046Hz
The single order natural resonance frequency 2200Hz of three rank resonance frequency＞electric jigging platform moving coils of present embodiment square rigidity platen.
Unitor 3 is a kind of coupling members, and its effect is for additional work platform 1 well being connected on the moving vibration table surface 5.When vibration table surface 5 during less than platen, it is necessary adopting unitor 3 to connect, and when vibration table surface 5 during greater than platen, can directly platen be fixed in vibration table surface 5 by supporting pad 2 without unitor 3.In order to guarantee the rigidity of unitor 3, unitor and additional work platform can select to have certain thickness light rigid materials, such as magnesium or aluminium or magnalium etc.
As shown in Figure 1, the connecting relation of additional work platform 1, supporting pad 2, unitor 3 and vibration table surface 5 is: unitor 3 usefulness socket head cap screws 8 are fixedlyed connected on the vibration table surface 5, again additional work platform 1 is passed through supporting pad 2, be fixedly connected on the unitor 3 with socket head cap screw 7.Additional work platform 1 end face is test specimen 4 fixedly, and the supporting pad 2 between unitor 3 and the additional work platform 1 adopts the bakelite bar.Screw hole on additional work platform 1 and the unitor 3 is evenly distributed, and to make things convenient for the installation of test specimen 4, screw must be tightened during installation, must not become flexible.Change different-thickness additional work platform 1, can adjust the high-frequency resonant point of shock response spectrum.
Below be that present embodiment DC-3000-36 electric vibration experiment does not use resonance device and uses the contrast of resonance device experiment effect spectral pattern:
Do not use resonance device at acceleration 15000m/s
2Situation under effect see shown in Figure 6.
Use resonance device at acceleration 15000m/s
2Situation under effect see shown in Figure 7.
Can come into plain view by Fig. 6 and Fig. 7 and to see that Fig. 6 waveform when the 2200Hz left and right sides moves towards trough from crest, and can see clearly that in Fig. 7 waveform just moves towards decay behind 4000Hz.These two test figure tables are told us, use resonance device high-frequency resonant point can be amplified backward, thereby can satisfy some tests that are difficult to realize at high band.
The foregoing description only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (7)
1, a kind of resonance device that is used for vibration test, it is characterized in that: form by an additional work platform that is fixed on shaking table or the shock testing machine work top, the main body of this additional work platform is a rigidity platen, its end face is for settling the additional mesa of test specimen, be provided with supporting pad around the platen bottom surface, the relative supporting pad of platen center section baseplane is unsettled, the intrinsic single order resonance frequency of described rigidity platen or the natural resonance frequency of multi-mode resonance frequencies＞shaking table or shock testing machine work top.
2, resonance device according to claim 1 is characterized in that: described rigidity platen is square platen, multistage natural resonance frequency be single order natural resonance frequency correspondence exponent number doubly, its single order natural resonance frequency as shown in the formula:
ω
n-single order natural resonance frequency, the rad/s of unit;
A-vibration shape constant, select one of following eight kinds:
a)35.99；b)73.41；c)108.27；d)131.64；
e)132.25；f)164.99；g)165.15；h)243.11；
The b-square platen suspension area length of side, the m of unit;
The E-elastic modulus, the Pa of unit;
The t-thickness of slab, the m of unit;
μ-Poisson ratio;
ρ
A-mass area ratio, units/m
2
3, resonance device according to claim 1 is characterized in that: described rigidity platen is circular platen, multistage natural resonance frequency be single order natural resonance frequency correspondence exponent number doubly, its single order natural resonance frequency as shown in the formula:
In the formula:
ω
n-single order natural resonance frequency, the rad/s of unit;
a
NS-vibration shape constant, counting N and pitch circle with the joint diameter, to count S relevant, and its numerical value is selected from following table:
The circular platen suspension area of R-radius, the m of unit;
The E-elastic modulus, the Pa of unit;
The t-thickness of slab, the m of unit;
μ-Poisson ratio;
ρ
A-mass area ratio, units/m
2
4, resonance device according to claim 1 is characterized in that: described rigidity platen is fixedly connected on shaking table or the shock testing machine work top by supporting pad.
5, resonance device according to claim 1 is characterized in that: described rigidity platen is fixedly connected on the unitor by supporting pad, and this unitor is fixedly connected on shaking table or the shock testing machine work top again.
6, resonance device according to claim 1 is characterized in that: described rigidity platen is made by magnesium or aluminium or magnalium material.
7, resonance device according to claim 1 is characterized in that: described supporting pad adopts the bakelite bar.
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| CNB2006100398090A CN100447547C (en) | 2006-04-14 | 2006-04-14 | Resonance device for vibration experiment |
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|---|---|---|---|
| CNB2006100398090A CN100447547C (en) | 2006-04-14 | 2006-04-14 | Resonance device for vibration experiment |
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| CN100447547C CN100447547C (en) | 2008-12-31 |
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| CN101587008B (en) * | 2009-07-20 | 2011-03-16 | 中国航空工业第一集团公司北京长城计量测试技术研究所 | Vibration enhanced device of electric vibration table |
| CN101854153A (en) * | 2010-05-21 | 2010-10-06 | 中国计量科学研究院 | Piezoelectric type high-frequency vibrating table |
| CN103492850B (en) * | 2011-04-21 | 2017-06-06 | 波音公司 | System and method for simulating high-intensity pyrotechnic shock |
| CN103492850A (en) * | 2011-04-21 | 2014-01-01 | 波音公司 | System and method for simulating high-intensity pyrotechnic shock |
| CN102304616A (en) * | 2011-07-22 | 2012-01-04 | 浙江大学 | Vibratory stress relief vibration level amplifying device |
| CN102304616B (en) * | 2011-07-22 | 2014-03-05 | 浙江大学 | Vibratory stress relief vibration level amplifying device |
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| CN105806580B (en) * | 2016-06-01 | 2018-07-13 | 吉林大学 | Stiffness variable wideband resonance mechanism |
| CN106248331A (en) * | 2016-08-30 | 2016-12-21 | 中国人民解放军空军工程大学航空航天工程学院 | Vibration amplifier and the test method of simulation blade high-order nonlinear vibrating fatigue |
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| CN108534976B (en) * | 2018-03-16 | 2019-09-24 | 西北工业大学 | A kind of shock response spectrum generator applied on vertical impact testing machine |
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| CN110542525B (en) * | 2019-06-25 | 2021-04-06 | 上海航空材料结构检测股份有限公司 | Method for testing vibration fatigue performance of metal in axial resonance state |
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| CN114459716A (en) * | 2022-04-13 | 2022-05-10 | 天津航天瑞莱科技有限公司 | Multi-frequency-band vibration amplifying device with adjustable synchronous amplification |
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Effective date of registration: 20090522 Address after: Jiangsu, Suzhou Province Industrial Park in the new science and Technology City, only Ting Town, No. 18 Ji Feng Road Patentee after: Suzhou Sushi Testing Instrument Co., Ltd. Address before: No. 55 deer Road, hi tech Development Zone, Jiangsu, Suzhou Patentee before: Suzhou Testing Instrument Factory |
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| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 215122 Suzhou Industrial Park, the new science and Technology City, the town of Ting Ting Feng Road, No. 18, No. Patentee after: Suzhou Sushi Testing Instrument Co.,Ltd. Address before: 215122 Suzhou Industrial Park, the new science and Technology City, the town of Ting Ting Feng Road, No. 18, No. Patentee before: Suzhou Sushi Testing Instrument Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 215122 Suzhou Industrial Park, the new science and Technology City, the town of Ting Ting Feng Road, No. 18, No. Patentee after: Suzhou Su test group Limited by Share Ltd Address before: 215122 Suzhou Industrial Park, the new science and Technology City, the town of Ting Ting Feng Road, No. 18, No. Patentee before: Suzhou Sushi Testing Instrument Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |