CN103252313B - Ultralight Eddy Current Excited device and vibration measuring method - Google Patents
Ultralight Eddy Current Excited device and vibration measuring method Download PDFInfo
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- CN103252313B CN103252313B CN201310136893.8A CN201310136893A CN103252313B CN 103252313 B CN103252313 B CN 103252313B CN 201310136893 A CN201310136893 A CN 201310136893A CN 103252313 B CN103252313 B CN 103252313B
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- 239000002184 metal Substances 0.000 claims abstract description 10
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Abstract
A kind of ultralight Eddy Current Excited device, it comprises: base, be installed on the shielding box on base and electromagnetic field generator, described electromagnetic field generator is arranged at described shielding box, it is characterized in that: the top of described shielding box is provided with aperture, described ultralight Eddy Current Excited device also includes and is arranged in described aperture and the ceramic bar reached in described shielding box, the piezoelectric force cell be connected with the upper end of described ceramic bar and the test specimen be connected with the upper end of described piezoelectric force cell, the lower end of described ceramic bar is stained with sheet metal, the ultralight Eddy Current Excited device of the present invention, its noise is low, frequency response is wide, structure is simple, additional mass impact is little, can be used for all materials exciting and can Measurement accuracy exciting force.
Description
Technical field:
The present invention relates to a kind of ultralight Eddy Current Excited device and vibration measuring method, refer in particular to ultralight Eddy Current Excited device and vibration measuring method that the exciting that is applied to light material and exciting force measure.
Background technology:
Light material (as fibre reinforced composites) has the feature of high specific stiffness, specific strength, is widely used in the industries such as military affairs, the energy and communications and transportation.Vibration experiments is the important step of light material structural design, and vibrator is indispensable device in vibration test.It can export the adjustable simple harmonic quantity power of size in certain frequency range, make to be swashed thing be subject to controlled, by the vibration of pre-provisioning request; Also can be used for detecting the intrinsic frequency of mechanical system.Because light material density is lower, generally only has 1/3 to 1/4 of steel alloy.When carrying out vibration experiment, require that vibrator not only will export larger exciting force, and require that the additional mass of vibrator is little, avoid producing considerable influence to test specimen natural vibration characteristic.
At present, conventional vibrator has mechanical type, electromagnetic type, electric-liquid type, piezo-electric crystal vibrator, magnetic driven and eddy-current exciter etc.
In above-mentioned vibrator, mechanical type vibrator is the inertia force or the mechanical load that utilize mechanical periodicity, to play exciting effect, and a kind of inertia force vibration exciter disclosed in Chinese patent CN102615038A.Its advantage is, manufactures simple, can obtain from less to very large exciting force (0 to several thousand kilograms); Shortcoming is that operating frequency range is very narrow, is generally 0 to 100Hz.Due to the impact by rotating speed, exciting force size cannot control separately, and in addition, the quality of machinery inertial formula vibrator own is comparatively large, has certain influence to the intrinsic frequency of excited system.
Electromagnetic actuator utilizes band point conductor in magnetic field, be subject to the effect of magnetic field force and produce motion.After providing DC current by field power supply, the stationary magnetic field that just formation one is powerful in the annulus gap of magnetic circuit, signal generator produces alternating signal, after power amplifier amplifies, be input to moving-coil, namely it and magnetic fields produce the power of an alternation, promote Examples of mobile systems motion, high energy activator disclosed in Chinese patent CN1069912.Electromagnetic actuator can obtain the exciting force of broad frequency band (from 0Hz to 10000Hz), also can obtain larger exciting force, but its cost is higher.In addition, electromagnetic actuator acts on test specimen by push rod and produces exciting force, push rod is equipped with coil and magnetic element, has certain quality, still can produce the impact of can not ignore to test specimen natural vibration characteristic.
Electro-hydraulic vibration exciter utilizes small power electric vibrator to drive hydraulic efficiency servo-valve, control ducted hydraulic pressure medium, piston in hydraulic cylinder just produces very large exciting force, thus makes to be swashed part acquisition vibration, a kind of electro-hydraulic vibration exciter disclosed in Chinese patent CN102734279A.Electro-hydraulic vibration exciter exciting force is large, and stroke is large, but excitation force frequency scope is generally zero point several hertz to hundreds of hertz, and cost is also higher, and vibrator quality is large, is applicable to the exciting of large scale structure.
Piezo-electric crystal vibrator utilizes the inverse piezoelectric effect of piezo-electric crystal to produce exciting force, and shortcoming is that exciting force is very little, is not suitable for the vibration characteristics test of fibrous composite test specimen.
Magnetic driven and eddy-current exciter are non-contact vibration exciter, chock-exciting method of electric eddy-magnetic push-pull and vibrator disclosed in permanent magnet type non-contact vibration exciter and excitation method thereof and Chinese patent CN1043642A disclosed in Chinese patent CN101599339A.This two classes vibrator is by the principle excitation test specimen vibration of electromagnetic induction, and exciting force is of moderate size, and contactless with test specimen, at utmost reduces the impact of vibrator additional mass on test specimen natural vibration characteristic.But owing to adopting the mode of electromagnetic induction, large to force cell electromagnetic interference, be difficult to measure exciting force size.In addition, the two is only applicable to have magnetic conduction or conductive material.As being applied to non-conductive and permeability magnetic material, need stickup magnetic conduction or conducting strip as driving source.
Therefore, necessary the deficiency solving prior art is improved to prior art.
Summary of the invention:
The invention provides a kind of ultralight Eddy Current Excited device and vibration measuring method, its noise be low, frequency response is wide, structure is simple, additional mass impact is little, the exciting that can be used for all materials and can Measurement accuracy exciting force.
The present invention adopts following technical scheme: a kind of ultralight Eddy Current Excited device, it comprises: base, be installed on the shielding box on base and electromagnetic field generator, described electromagnetic field generator is arranged at described shielding box, it is characterized in that: the top of described shielding box is provided with aperture, described ultralight Eddy Current Excited device also includes and is arranged in described aperture and the ceramic bar reached in described shielding box, the piezoelectric force cell be connected with the upper end of described ceramic bar, and the test specimen to be connected with the upper end of described piezoelectric force cell, the upper end of described ceramic bar is connected with the lower end of described piezoelectric force cell, the lower end of described ceramic bar is stained with sheet metal.
The present invention also adopts following technical scheme: a kind of vibration measuring method of ultralight Eddy Current Excited device, and it includes following steps:
Utilize described electromagnetic field generator to generate an electromagnetic field, produce exciting force according on the sheet metal of Eddy Current Excited principle bottom described ceramic bar;
The upper end of described ceramic bar connects the lower end of piezoelectric force cell, and the upper end of described piezoelectric force cell is connected with test specimen, makes described test specimen produce vibration;
Described piezoelectric force cell is utilized to measure exciting force size;
Utilize described shielding box to shield the electromagnetic field of electromagnetic generator generation, avoid electromagnetic field to produce interference to piezoelectric force cell.
The present invention has following beneficial effect:
(1). the present invention adopts piezoelectric force cell accurately to measure the size of exciting force, and the electromagnetic field adopting electromagnetic shielding box shield electromagnetic generator to produce, avoids electromagnetic field to produce interference to piezoelectric force cell;
(2). the present invention reduces ceramic bar and piezoelectric force cell additional mass to greatest extent on the impact of test specimen natural vibration characteristic, makes test result more accurate;
(3). structure of the present invention is simple, easily realizes, greatly reduces cost.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of the ultralight Eddy Current Excited device of the present invention.
Fig. 2 is another structural representation of Eddy Current Excited device ultralight shown in Fig. 1.
Wherein
1-base, 2-shielding box, 3-electromagnetic field generator, 4-sheet metal, 5-ceramic bar, 6-piezoelectric force cell, 7-test specimen.
Detailed description of the invention:
Please refer to shown in Fig. 1, the ultralight Eddy Current Excited device of the present invention comprises: base 1, shielding box 2, electromagnetic field generator 3, sheet metal 4, ceramic bar 5, piezoelectric force cell 6.Wherein electromagnetic field generator 3 and shielding box 2 are arranged on base 1; Electromagnetic field generator 3 is positioned at shielding box 2, aperture is arranged at shielding box 2 top, and ceramic bar 5 stretches into shielding box 2 by aperture, and ceramic bar 5 lower end is stained with sheet metal 4, ceramic bar 5 upper end is connected with piezoelectric force cell 6 lower end, and piezoelectric force cell 6 upper end is connected with test specimen 7.
During use, test specimen 7 is fixed, then install the ultralight Eddy Current Excited device of the present invention by Fig. 1.By shielding box 2 ground connection, electromagnetic field generator 3 is connected power amplifier, power amplifier connection signal generator.By piezoelectric force cell 6 connection signal amplifier, by signal amplifier connection signal acquisition system.Signal generator is adopted to produce signal, and input power amplifier.Power amplifier drives electromagnetic field generator 3 to produce alternation strong-electromagnetic field.Alternation strong-electromagnetic field produces current vortex in sheet metal 4, and the magnetic field that current vortex produces and the magnetic field interaction that electromagnetic field generator 3 produces, produce exciting force.Exciting force passes to piezoelectric force cell 6 by ceramic bar 5.Piezoelectric force cell 6 the most at last exciting force is delivered to test specimen 7, realizes exciting.
In the work of the ultralight Eddy Current Excited device of the present invention, measurement of exciting force can be completed simultaneously, it includes following process: utilize electromagnetic field generator 3 to generate an electromagnetic field, and produces exciting force according on the sheet metal 4 of Eddy Current Excited principle bottom ceramic bar 5; Ceramic bar 5 connects piezoelectric force cell 6 and test specimen 7, makes test specimen 7 produce vibration; Piezoelectric force cell 6 is utilized accurately to measure exciting force size; Utilize shielding box 2 to shield the electromagnetic field of electromagnetic generator 3 generation, avoid electromagnetic field to produce interference to piezoelectric force cell 6.
The ultralight Eddy Current Excited device of the present invention and vibration measuring method can effectively reduce exciting device additional mass, reduce cost, and can realize exciting and vibration measuring is carried out simultaneously.
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, can also make some improvement under the premise without departing from the principles of the invention, and these improvement also should be considered as protection scope of the present invention.
Claims (2)
1. a ultralight Eddy Current Excited device, it comprises: base, be installed on the shielding box on base and electromagnetic field generator, described electromagnetic field generator is arranged at described shielding box, it is characterized in that: the top of described shielding box is provided with aperture, described ultralight Eddy Current Excited device also includes and is arranged in described aperture and the ceramic bar reached in described shielding box, the piezoelectric force cell be connected with the upper end of described ceramic bar, and the test specimen to be connected with the upper end of described piezoelectric force cell, the upper end of described ceramic bar is connected with the lower end of described piezoelectric force cell, the lower end of described ceramic bar is stained with sheet metal.
2. a vibration measuring method for ultralight Eddy Current Excited device as claimed in claim 1, it includes following steps:
Utilize described electromagnetic field generator to generate an electromagnetic field, produce exciting force according on the sheet metal of Eddy Current Excited principle bottom described ceramic bar;
The upper end of described ceramic bar connects the lower end of piezoelectric force cell, and the upper end of described piezoelectric force cell is connected with test specimen, makes described test specimen produce vibration;
Described piezoelectric force cell is utilized to measure exciting force size;
Utilize described shielding box to shield the electromagnetic field of electromagnetic generator generation, avoid electromagnetic field to produce interference to piezoelectric force cell.
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| CN201310136893.8A CN103252313B (en) | 2013-04-19 | 2013-04-19 | Ultralight Eddy Current Excited device and vibration measuring method |
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| CN201310136893.8A CN103252313B (en) | 2013-04-19 | 2013-04-19 | Ultralight Eddy Current Excited device and vibration measuring method |
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| CN103252313B true CN103252313B (en) | 2015-10-28 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043642A (en) * | 1989-12-24 | 1990-07-11 | 南京航空学院 | Chock-exciting method of electric eddy-magnetic push-pull and vibrator |
| WO2004005879A1 (en) * | 2002-07-03 | 2004-01-15 | Midwest Research Institute | Resonance test system |
| CN1603770A (en) * | 2004-11-04 | 2005-04-06 | 上海交通大学 | Motion control and vibration control experimental system for flexible cantilever beam in noninertial system |
| WO2007102305A1 (en) * | 2006-03-07 | 2007-09-13 | Nec Corporation | Piezoelectric actuator and electronic device |
| CN101762368A (en) * | 2009-12-28 | 2010-06-30 | 嘉兴学院 | Elastomer dynamic response and vibration control test system under time varying load effect |
-
2013
- 2013-04-19 CN CN201310136893.8A patent/CN103252313B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043642A (en) * | 1989-12-24 | 1990-07-11 | 南京航空学院 | Chock-exciting method of electric eddy-magnetic push-pull and vibrator |
| WO2004005879A1 (en) * | 2002-07-03 | 2004-01-15 | Midwest Research Institute | Resonance test system |
| CN1603770A (en) * | 2004-11-04 | 2005-04-06 | 上海交通大学 | Motion control and vibration control experimental system for flexible cantilever beam in noninertial system |
| WO2007102305A1 (en) * | 2006-03-07 | 2007-09-13 | Nec Corporation | Piezoelectric actuator and electronic device |
| CN101762368A (en) * | 2009-12-28 | 2010-06-30 | 嘉兴学院 | Elastomer dynamic response and vibration control test system under time varying load effect |
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