CN1084620A - Magnetic spring with negative coefficient of elasticity - Google Patents
Magnetic spring with negative coefficient of elasticity Download PDFInfo
- Publication number
- CN1084620A CN1084620A CN92110907A CN92110907A CN1084620A CN 1084620 A CN1084620 A CN 1084620A CN 92110907 A CN92110907 A CN 92110907A CN 92110907 A CN92110907 A CN 92110907A CN 1084620 A CN1084620 A CN 1084620A
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- China
- Prior art keywords
- negative
- elasticity
- coefficient
- coil
- spring
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F6/00—Magnetic springs; Fluid magnetic springs, i.e. magnetic spring combined with a fluid
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
Magnetic spring with negative coefficient of elasticity relates to the physics technical field, and after elasticity coefficient was negative value and common spring assembly, the proof resilience coefficient was less than the elasticity coefficient of common spring.Major character is a serial connection negative resistance and and connect negative inductance, resistance etc. in EM induction system.Can be used for reducing the resonator system natural frequency.
Description
The present invention relates to the physics technical field, specifically, is a kind of magnetic spring with negative elasticity coefficient.
In vibration system, the performance of spring is extremely important, sometimes in order to reach desirable low-frequency resonant effect, the elasticity coefficient of wishing spring is the smaller the better, but in fact, because most of springs are being undertaken the effect of supporting, be difficult to do too softly, that is to say that the elasticity coefficient of spring is difficult to fall very lowly.At present reducing the general method of the elastic coefficient is the length that adds big spring, but the lengthening spring can bring a series of structural problems, and sometimes or even impossible, and stability, the noiseproof feature of system all can reduce greatly behind the lengthening spring.
Purpose of the present invention is exactly that a kind of magnetoelasticity system with negative elasticity coefficient will be provided, after it and common spring are used in combination, under the situation that does not reduce former spring structure and bearing value, the elasticity coefficient of whole system is reduced, reach the purpose that reduces resonant frequency.
This task realizes by following measure:
1. insert the negative inductance device at the coil two ends of EM induction system;
2. series negative resistance device between coil and negative inductance device.
3. at negative inductance two ends parallel connection build-out resistor R.
Below in conjunction with accompanying drawing details of the present invention is described:
Accompanying drawing (one) is a system schematic of the present invention.
Accompanying drawing (two) is an electrical schematic diagram of the present invention.
(1) is coil rack among the figure, and (4) are the magnetic conduction letters, and (5) are external circuit, and (6) are the equivalent circuits of coil.
Have according to Ohm's law:
E（t）＝I（t）r+I（t）Rf+L (dI（t）)/(dt) （1）
The effect of negative resistance R is in order to eliminate the influence of coil internal resistance r to electric current, voltage-phase in the loop, makes by adjusting | R
f|=r, then (1) formula can be reduced to:
E（t）＝L (dI（t）)/(dt)
When coil (3) with respect to magnet steel (2) when doing simple harmonic oscillation, make that its angle of throw frequency is W, amplitude is Sm, initial phase is O, then its vibration equation is:
S＝Smsinωt（3）
For the magnetic spring with negative coefficient of elasticity system shown in the accompanying drawing (), the induction electromotive force that vibration is produced is:
E（t）＝-ωBlSmCOSωt（4）
In the formula: the magnetic induction intensity in the B-air gap
Stitch length in the l-magnetic field
(3) substitution (2) is had:
-ωBlSmcosωt＝L (dI（t）)/(dt)
Separate this differential equation:
I（t）＝-∫ (ωBlSm)/(L) cosωdt
＝- (BlSm)/(L) sinωt（5）
According to Ampere law, coil midstream excess current I(t) time, coil will be subjected to the effect of Ampere force, and establishing Ampere force is FA
FA＝BlI（t）
＝－ (B
21
2Sm)/(L) sinωt
Accompanying drawing (three) is the curve of formula (3), (4), (5), (6), and wherein " 1 " is F
A-t curve, " 2 " are I(t)-the t curve, " 3 " are the S-t curves, " 4 " are E(t)-the t curve.
Scheme (three) as can be seen, behind the access negative inductance L, displacement, electric current I in the loop (t), the suffered Ampere force F of coil
ACophasings all, promptly the direction of Ampere force is identical with the direction of displacement.Again from (6) formula as can be known, the size of Ampere force and the absolute value of negative inductance are inversely proportional to, and are directly proportional with displacement.
The elasticity coefficient that makes magnetic spring with negative coefficient of elasticity is K
f, have according to Hooke's law:
F
A＝-K
f·Smsinωt（7）
Connection is separated (6), (7) can get:
K
f＝ (B
21
2)/(L) （8）
Because L is a negative value, so K also is a negative value.
For the assurance system can proper functioning R
fSelect voltage inversion type connection for use, L selects electric current inversion type connection for use.This be because, R
fEffect be to offset internal resistance r to make total equivalent resistance approach zero, so be that series connection is used, at this moment the electric current by r and R is same electric current, to R
f, belong to the pressure drop reaction under the current excitation, having only electricity consumption to press the inversion type negative resistance device just can reach total internal resistance pressure drop is zero effect.And the effect of L is the excitation according to coil-induced voltage, and output Ampere force electric current so use the electric current inversion type.In all system, L, R
fWith coil (6) be again a big series loop, voltage inversion type device mixes use with electric current inversion type device, can guarantee system-wide working stability, is the another reason of this selection.
Accompanying drawing (four) is embodiments of the invention.Wherein W1, R1, R2 constitute negative resistance with FZ-3, and the size of negative resistance determines that according to coil internal resistance r negative electricity sensibility reciprocal negative elasticity coefficient as required determines that regulate by W2, FZ-3 is a negative-resistance device, V
+, V
-Be respectively the positive supply and the negative supply of FZ-3 work, the concrete use of relevant FZ-3 sees this device products explanation for details.
This system can be used in the magnetoelectric vibration transducer, all there are permanent-magnet steel and inductor coil in magnetoelectric vibration transducer inside, and magnet steel or coil spring-loaded are when extraneous vibration, the permanent-magnetic field relative movement that coil and magnet steel produce, cutting magnetic line induced signal voltage.Because this class sensor has Machine Movement Process, has natural frequency inevitably, its frequency values is W=
, in order to widen the low-frequency range of sensor, just need the natural frequency of reduction system, or reduce the K value, or increase m value, but reduce K value and increase m value is again a pair of contradiction, so the low-frequency effect of common vibration transducer is all undesirable.If insert negative inductance L at the inductor coil two ends of sensor, itself just constitute a magnetic spring with negative coefficient of elasticity, be equivalent to elasticity coefficient be K
0Spring elasticity coefficient in parallel be K
fThe magnetic spring, make the total elasticity coefficient of system become K
f+ K
o, because K
fBe negative value, so the elasticity coefficient of system has reduced the also corresponding reduction of the natural frequency of system.
Claims (4)
1, one by vibrator coil 3, permanent-magnet steel 2, negative resistance device R
1, the negative spring system formed of negative inductance L and build-out resistor R, it is characterized in that: R is with after L is in parallel and R
1Series connection is connected in coil (6) two ends then.
2, system according to claim 1 further is characterized as: R
fAbsolute value and (6) in internal resistance r value near or equate that the difference absolute value of the two is not more than 20 Ω.
3, system according to claim 1 further is characterized as: R
fBe voltage inversion type negative resistance circuit.
4, system according to claim 1 further is characterized as: L is an electric current inversion type negative inductance circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92110907A CN1084620A (en) | 1992-09-25 | 1992-09-25 | Magnetic spring with negative coefficient of elasticity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92110907A CN1084620A (en) | 1992-09-25 | 1992-09-25 | Magnetic spring with negative coefficient of elasticity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1084620A true CN1084620A (en) | 1994-03-30 |
Family
ID=4945029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92110907A Pending CN1084620A (en) | 1992-09-25 | 1992-09-25 | Magnetic spring with negative coefficient of elasticity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1084620A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1082622C (en) * | 1997-05-16 | 2002-04-10 | 株式会社三角工具加工 | Energy extructing mechanism with magnetic spring |
| CN102392864A (en) * | 2011-11-09 | 2012-03-28 | 上海杰灵磁性器材有限公司 | Magnetic force shock-absorbing device |
| CN104930099A (en) * | 2015-06-26 | 2015-09-23 | 中国科学院合肥物质科学研究院 | Bidirectional rotation damper based on cylinder magnet pair and control method thereof |
| CN105257750A (en) * | 2015-11-19 | 2016-01-20 | 西安空间无线电技术研究所 | Multi-model electromagnetic vibration absorber |
| CN106246783A (en) * | 2016-08-31 | 2016-12-21 | 苏州博众精工科技有限公司 | A kind of cam support device |
| CN108019452A (en) * | 2017-12-29 | 2018-05-11 | 浙江理工大学 | A kind of half actively controllable linear Stiffness electromagnetism vibration isolator |
| CN108317206A (en) * | 2017-01-18 | 2018-07-24 | 香港理工大学 | A kind of electromagnetism Shunt Damping System device system that mechanical behavior is variable |
-
1992
- 1992-09-25 CN CN92110907A patent/CN1084620A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1082622C (en) * | 1997-05-16 | 2002-04-10 | 株式会社三角工具加工 | Energy extructing mechanism with magnetic spring |
| CN102392864A (en) * | 2011-11-09 | 2012-03-28 | 上海杰灵磁性器材有限公司 | Magnetic force shock-absorbing device |
| CN104930099A (en) * | 2015-06-26 | 2015-09-23 | 中国科学院合肥物质科学研究院 | Bidirectional rotation damper based on cylinder magnet pair and control method thereof |
| CN105257750A (en) * | 2015-11-19 | 2016-01-20 | 西安空间无线电技术研究所 | Multi-model electromagnetic vibration absorber |
| CN105257750B (en) * | 2015-11-19 | 2018-10-09 | 西安空间无线电技术研究所 | A kind of multi-modal Electromagnet absorber |
| CN106246783A (en) * | 2016-08-31 | 2016-12-21 | 苏州博众精工科技有限公司 | A kind of cam support device |
| CN108317206A (en) * | 2017-01-18 | 2018-07-24 | 香港理工大学 | A kind of electromagnetism Shunt Damping System device system that mechanical behavior is variable |
| CN108317206B (en) * | 2017-01-18 | 2019-12-10 | 香港理工大学 | electromagnetic shunt damper system with variable mechanical behavior |
| CN108019452A (en) * | 2017-12-29 | 2018-05-11 | 浙江理工大学 | A kind of half actively controllable linear Stiffness electromagnetism vibration isolator |
| CN108019452B (en) * | 2017-12-29 | 2019-06-28 | 浙江理工大学 | A kind of half actively controllable linear Stiffness electromagnetism vibration isolator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |