CN85103849A - Fatigue tester for electromagnetic eddy excitation and design thereof - Google Patents
Fatigue tester for electromagnetic eddy excitation and design thereof Download PDFInfo
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- CN85103849A CN85103849A CN85103849.2A CN85103849A CN85103849A CN 85103849 A CN85103849 A CN 85103849A CN 85103849 A CN85103849 A CN 85103849A CN 85103849 A CN85103849 A CN 85103849A
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- fatigue tester
- exciting force
- test specimen
- electromagnetic eddy
- exciting
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Abstract
Fatigue tester for electromagnetic eddy excitation and design thereof belong to field of mechanical technique.
The objective of the invention is to according to the electromagnetic eddy excitation principle, it is low to develop a kind of noise, and the high-order high frequency performance is good, and energy resource consumption is low, and is simple in structure, is applicable to the novel fatigue tester of low resistivity material.
The major technique feature is: this fatigue tester does not have motion parts, and exciting force directly acts on test specimen, and exciting force is recommended exciting force two parts by current vortex exciting force and electromagnetism and formed.
Description
The invention belongs to field of mechanical technique.
According to " engine strength vibration test technology " volumes such as (, National Defense Industry Press in 1981) Beijing Institute of Aeronautics Song Zhao are deep book introduction, blade fatigue tester excitation system mainly contains gas pulses vibrator and beam vibration platform.The former noise is big, and test bay can be up to 150db; Latter's high-order high-frequency ability is poor, and consumed power is big, equipment complexity, cost height.
According to U.S. ASME 69-Vib-59 report, vortex-excited oscillation also is a kind of exciting means, but has only a sketch, without any technical information, consults state's patent documentations such as English, U.S., does not all find relevant patent.
The objective of the invention is to according to the electromagnetic eddy excitation principle, the development noise is little, and high-order high-cycle fatigue performance is good, and energy resource consumption is low, and is simple in structure, is applicable to the novel fatigue tester of low resistivity material.
Ultimate principle according to electromagnetic theory, when alternating flux is passed electric conductor, promptly produces the induced electricity eddy current in conductor, if rightly permanent magnetic field is set, then conductor will be subjected to the effect of electromagnetic force and produce vibration.
Current vortex exciting force F
2=0.102 * 10
-7BIL=A
2Sin ω t
According to Theory of Electromagnetic Field, magnet is subjected to the effect of electromagnetism traction thrust and vibrates in alternating magnetic field.Electromagnetism is recommended exciting force F
1=8.16 * 10
-8(SBo)/(μ o) Bac=A
1Sin(ω t+ (π)/2)
Two power act on test specimen simultaneously:
F＝F
1+F
2＝Ae
i（ωt+φ）
Fatigue tester for electromagnetic eddy excitation does not move partly, mainly by base (1), and magnetizing coil (2), C sections core (3), permanent magnet compositions such as (4) forms a pair of AC and DC magnetic circuit.Comprise the series capacitance resonance box in the interchange magnetic circuit system, magnetizing coil should be provided with a plurality of taps.The magnetic circuit system that includes anchor clamps and test specimen in the dc circuit magnetic loop system.
The effect of electromagnetic eddy excitation depends primarily on the distribution of current vortex field, the configuration in AC and DC magnetic field, the impedance matching of exerciser and power amplifier, the design of dc circuit magnetic loop system, selection of tuning-points etc. in the exciting circuit.
Array mode: the gap size a between permanent magnet and the vortex induction head (C sections core) is the key of textural association, and best clearance should be between 10～30mm.
According to the natural frequency of test specimen, on the impedance matching equilibrium running line of exerciser and power amplifier, select the corresponding magnetizing coil number of turn, regulate series capacitance, make exciting circuit generation resonance.
The present invention has the following advantages:
1. exciting force directly acts on test specimen, the capacity usage ratio height, and power consumption is low, has only tens to 250 watts.
2. weariness working bandwidth, high frequency characteristics is good.The tired frequency band of having done is 140～3172Hz.
3. the exciting force application point can be regulated arbitrarily, and high-order torture test ability is strong.
4. noise low (noise of exerciser own is not more than 70db).
5. simple in structure, compactness, use, easy to maintenance.
Be applicable to the vibration fatigue test of low resistivity material, be specially adapted to the blade vibration torture test.The present invention has a synoptic diagram.
Permanent magnet (4) fuses with C sections core (3), forms the permanent magnetic circuit of current vortex exciting, and its gap size a is a key, answers strict control, so that bigger permanent magnetic induction density zone and bigger electric eddy current density zone coincide.Cover makes the test specimen magnetization with direct-flow magnet exciting coil on anchor clamps, forms the dc circuit magnetic loop of electromagnetism traction thrust.
Claims (4)
1, fatigue tester for electromagnetic eddy excitation is made up of the AC and DC magnetic circuit system, and feature of the present invention is, fatigue tester does not move partly, and exciting force directly acts on test specimen, and exciting force is recommended exciting force two by current vortex exciting force and electromagnetism and partly formed.
2, according to the fatigue tester of claim 1, it is characterized in that exchanging series capacitance resonance box in the magnetic circuit system, magnetizing coil is provided with a plurality of taps.The magnetic circuit system that contains anchor clamps and test specimen in the dc circuit magnetic loop system.
3, according to the fatigue tester of claim 1 or 2, it is characterized in that the gap size a between permanent magnet and the vortex induction head is the key of textural association, best clearance should be between 10～30mm.
4, according to the fatigue tester of claim 1 or 2, it is characterized in that on the impedance matching equilibrium running line of fatigue tester and power amplifier, selecting the corresponding magnetizing coil number of turn according to by the natural frequency of test specimen, regulate series capacitance, make exciting circuit resonance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85103849 CN1017375B (en) | 1985-05-12 | 1985-05-12 | Fatigue tester for electromagnetic eddy excitation and its design |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85103849 CN1017375B (en) | 1985-05-12 | 1985-05-12 | Fatigue tester for electromagnetic eddy excitation and its design |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85103849A true CN85103849A (en) | 1987-04-15 |
| CN1017375B CN1017375B (en) | 1992-07-08 |
Family
ID=4793477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85103849 Expired CN1017375B (en) | 1985-05-12 | 1985-05-12 | Fatigue tester for electromagnetic eddy excitation and its design |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1017375B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994923A (en) * | 2014-04-30 | 2014-08-20 | 浙江理工大学 | Suspension electromagnetic incentive resonant type fatigue test method |
| CN108204887A (en) * | 2018-02-02 | 2018-06-26 | 北京化工大学 | A kind of crop leaf measuring platform |
| RU205712U1 (en) * | 2021-03-11 | 2021-07-29 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Владимирский Государственный Университет имени Александра Григорьевича и Николая Григорьевича Столетовых" (ВлГУ) | Installation for testing long material samples |
| CN113237617A (en) * | 2021-04-08 | 2021-08-10 | 天津大学 | Underwater shell modal test device considering internal flow field and pressure influence thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101915652A (en) * | 2010-08-13 | 2010-12-15 | 中南大学 | Electromagnetic drive method and device for concrete pump truck arm fatigue tests |
-
1985
- 1985-05-12 CN CN 85103849 patent/CN1017375B/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994923A (en) * | 2014-04-30 | 2014-08-20 | 浙江理工大学 | Suspension electromagnetic incentive resonant type fatigue test method |
| CN108204887A (en) * | 2018-02-02 | 2018-06-26 | 北京化工大学 | A kind of crop leaf measuring platform |
| RU205712U1 (en) * | 2021-03-11 | 2021-07-29 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Владимирский Государственный Университет имени Александра Григорьевича и Николая Григорьевича Столетовых" (ВлГУ) | Installation for testing long material samples |
| CN113237617A (en) * | 2021-04-08 | 2021-08-10 | 天津大学 | Underwater shell modal test device considering internal flow field and pressure influence thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1017375B (en) | 1992-07-08 |
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