CN101853595A - Electromagnetic drive type resonant and inherent frequency demonstrator - Google Patents
Electromagnetic drive type resonant and inherent frequency demonstrator Download PDFInfo
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- CN101853595A CN101853595A CN201010170424A CN201010170424A CN101853595A CN 101853595 A CN101853595 A CN 101853595A CN 201010170424 A CN201010170424 A CN 201010170424A CN 201010170424 A CN201010170424 A CN 201010170424A CN 101853595 A CN101853595 A CN 101853595A
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Abstract
The invention discloses an electromagnetic drive type resonant and inherent frequency demonstrator, comprising a low-frequency signal generator, an electromagnet, a metal strip, a cramp and a base, wherein the electromagnet is arranged on the surface of the base; one end of the metal strip is clamped by the clamp; the metal strip is arranged on the surface of the base; and the other end of the metal strip is positioned below the electromagnet which is connected with the low-frequency signal generator; the base is provided with a positioning door which is clamped from top to bottom and is used for fixing an iron clamp; the positioning door is provided with an inclined plane facing downwards; and the height of the clamp can be adjusted by moving the clamp back and forth. The invention has the advantages of simple structure, convenient use, remarkable amplitude, convenient observation, continuous vibration for a long time, convenient and free change of inherent frequency, capability of acquiring accurate frequency value feedback, convenience for carrying and firmness.
Description
Technical field
The present invention relates to the apparatus for demonstrating in a kind of instructional device, specifically, what relate to is a kind of electromagnetic drive type resonant, inherent frequency demonstrator.
Background technology
Resonance is more significant knowledge point in the related content of mechanical vibration.Resonance is described in each version textbook more, and occurs as an examination point in college entrance examination.But in present textbook, the experiment of resonance is also few, and effect is also also not obvious.
The resonance lecture experiment of now often seeing is to lean on the object of a vibration to remove to instigate another natural frequency object identical with it mostly.
The weak point of existing this class experiment equipment has:
1. experiment effect is also not obvious, and amplitude is less.
2. because driving force is the vibration of vibrating object itself provides, owing to there be not the additional of energy, so, need not how long vibrate and to stop gradually along with the continuous loss of its mechanical energy.
3. the adjustable natural of experiment equipment joint property is not strong, and natural frequency is all fixed, even if can change the natural frequency of being instigated thing, is to adopt the way of replacing assembly yet, control variable accurately, so that the expansion leeway of testing is limited.
4. natural frequency measurement, and resonance are not connected, can only obtain a qualitative conclusions mostly.
5. for carrying, bulky or fine rule easily twines damage mostly.
Summary of the invention
The objective of the invention is to solve above-mentioned deficiency of the prior art, a kind of electromagnetic drive type resonant, inherent frequency demonstrator are provided, simple in structure, easy to operate, observe simple and clear.
For realizing above-mentioned purpose, electromagnetic drive type resonant of the present invention, inherent frequency demonstrator, comprise: low frequency generator, electromagnet, metal are rectangular, clip, base, wherein: described electromagnet is arranged on susceptor surface, metal is rectangular to be clamped an end by clip and also is arranged on susceptor surface, the rectangular other end of metal is positioned at the electromagnet below, and electromagnet links to each other with low frequency generator;
Further, described susceptor surface is provided with a chute, and electromagnet moves horizontally in this chute.
Further, described electromagnet is arranged in the transparent organic glass cover, and it is rectangular that the lower limb of plexiglass tent is provided with the track that matches with the base upper hopper chute.
Further, described clip, the one end is fixed on susceptor surface by fixed orifice, and the other end passes from position gates, and position gates is fixed on the base.
Further, described position gates, itself and clip contact portion have inclined-plane down, can be by moving forward and backward the height of clamp adjustment clip.
Further, described clip, the intermediate portion is clipped in the spacing seam that limits its double swerve;
Further, described clip is provided with the support spring of further fixing its position, and this support spring props up scab from bottom to top, makes firmly being stuck between position gates and the fixed orifice of clip, and can regulate its fixing elasticity by the rotation support spring.
Among the present invention, the frequency of alternating current in the low frequency generator control input electromagnet, because the electromagnet of energising is a bar magnet, what low frequency generator was exported is alternating current, so the polarity of electromagnet constantly changes, thereby rectangular a little while attraction of the metal of electromagnet below do not attracted a little while, produce the driving force of one-period variation, make metal rectangular constantly up and down the shake, so by the frequency of control low frequency generator, can be so that the rectangular vibration amplitude of metal constantly changes, when the rectangular natural frequency of the frequency and the metal of low frequency generator is identical, reach resonance, the rectangular vibration amplitude maximum of metal this moment.
Compare with existing apparatus for demonstrating, the present invention is simple in structure, and is easy to use, and amplitude is obvious, is convenient to observe; Vibration can continue for a long time; Can change natural frequency (such as by changing length) easily arbitrarily; Can obtain accurate frequency numerical value feedback; Be easy to carry, be difficult for impaired; Even the hormetic position that applies also can change arbitrarily.
Description of drawings
Fig. 1 is one embodiment of the invention structural representation;
Fig. 2 is one embodiment of the invention low frequency generator and electromagnet connection diagram.
Among the figure: base 1, fixed orifice 2, support spring 3, spacing seam 4, clip 5, position gates 6, metal are rectangular 7, electromagnet 8, plexiglass tent 9, chute 10, low frequency generator 11.
Embodiment
The technical solution of the present invention is further explained below in conjunction with drawings and Examples, but following content is not intended to limit the scope of the invention.
As shown in Figure 1, 2, present embodiment provides a kind of electromagnetic drive type resonant, inherent frequency demonstrator, comprise: low frequency generator 11, electromagnet 8, metal are rectangular 7, clip 5, base 1, wherein: described electromagnet 8 is arranged on base 1 surface, metal rectangular 7 is clamped an end by clip 5 and also is arranged on base 1 surface, the other end of metal rectangular 7 is positioned at electromagnet 8 belows, and electromagnet 8 links to each other with low frequency generator 11;
In the present embodiment, metal rectangular 7 adopts saw blade, and concrete experimental demonstration step is as follows:
1, with electromagnet 8 and saw blade respectively with installing as shown in Figure 1, make that distance between the two is suitable.
2, electromagnet 8 is connected low frequency generator 11, and opening power is connected.
3, the frequency of conditioning signal generator 11 output notes observing the amplitude that saw blade vibrates.
4, when finding amplitude maximum part, the distance between regulating magnet 8 and the saw blade makes experiment effect obvious.
5, change length of saw blade and repeated for the 3rd, 4 steps.
Experimental result is quite obvious, if the inconsistent words of frequency, saw blade is motionless at all.When the driving force frequency is consistent with saw blade, tangible vibration can be observed, even the clear and melodious sound that saw blade and iron core collision are sent can be heard.And by signal generator 11 numerical value of read frequency easily.
In the present embodiment, described base 1 surface is provided with a chute 10, and electromagnet 8 moves horizontally in this chute 10.
In the present embodiment, described electromagnet 8 is arranged in the transparent organic glass cover 9, and it is rectangular that the lower limb of plexiglass tent 9 is provided with the track that matches with the base upper hopper chute.
In the present embodiment, described clip 5, the one end is fixed on base 1 surface by fixed orifice 2, and the other end passes from position gates 6, and position gates 6 is fixed on the base 1.
In the present embodiment, described position gates 6, itself and clip 5 contact portions have inclined-plane down, can be by moving forward and backward the height of clamp adjustment clip.
In the present embodiment, described clip 5, the intermediate portion is clipped in the spacing seam 4 that limits its double swerve;
In the present embodiment, described clip 5 is provided with the support spring 3 of further fixing its position, and this support spring 3 props up scab 5 from bottom to top, make firmly being stuck between position gates 6 and the fixed orifice 2 of clip 5, and can regulate its fixing elasticity by rotation support spring 3.
In the present embodiment, the frequency of alternating current in the low frequency generator 11 control input electromagnet 8, because the electromagnet 8 of energising is a bar magnet, what low frequency generator 11 was exported is alternating current, so the polarity of electromagnet 8 constantly changes, thereby the saw blade to electromagnet 8 belows attracts to repel a little while a little while, make saw blade constantly shake up and down, so frequency by control low frequency generator 11, can be so that the saw blade vibration amplitude constantly changes, when the natural frequency of the frequency of low frequency generator 11 and saw blade is identical, reach resonance, this moment saw blade the vibration amplitude maximum.
By above embodiment as can be seen, the present invention is simple in structure, and is easy to use, and amplitude is obvious, is convenient to observe; Vibration can continue for a long time; Can change natural frequency (such as by changing length) easily arbitrarily; Can obtain accurate frequency numerical value feedback; Be easy to carry, be difficult for impaired; Even the hormetic position that applies also can change arbitrarily.
Claims (7)
1. an electromagnetic drive type resonant, inherent frequency demonstrator, it is characterized in that, comprise: low frequency generator, electromagnet, metal are rectangular, clip, base, wherein: described electromagnet is arranged on susceptor surface, metal is rectangular to be clamped an end by clip and also is arranged on susceptor surface, the rectangular other end of metal is positioned at the electromagnet below, and electromagnet draws low frequency generator and links to each other.
2. electromagnetic drive type resonant according to claim 1, inherent frequency demonstrator is characterized in that: described susceptor surface is provided with a chute, and electromagnet moves horizontally in this chute.
3. electromagnetic drive type resonant according to claim 2, inherent frequency demonstrator is characterized in that: described electromagnet is arranged in the transparent organic glass cover, and it is rectangular that the lower limb of plexiglass tent is provided with the track that matches with the base upper hopper chute.
4. electromagnetic drive type resonant according to claim 1, inherent frequency demonstrator is characterized in that: described clip, and the one end is fixed on susceptor surface by fixed orifice, and the other end passes from position gates, and position gates is fixed on the base.
5. electromagnetic drive type resonant according to claim 4, inherent frequency demonstrator is characterized in that: described position gates, itself and clip contact portion have inclined-plane down, can be by moving forward and backward the height of clamp adjustment clip.
6. according to claim 1 or 4 described electromagnetic drive type resonants, inherent frequency demonstrator, it is characterized in that: described clip, intermediate portion are clipped in the spacing seam that limits its double swerve.
7. according to claim 1 or 4 described electromagnetic drive type resonants, inherent frequency demonstrator, it is characterized in that: described clip, be provided with the support spring of further fixing its position, this support spring props up scab from bottom to top, make firmly being stuck between position gates and the fixed orifice of clip, and can regulate its fixing elasticity by the rotation support spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010170424A CN101853595A (en) | 2010-05-11 | 2010-05-11 | Electromagnetic drive type resonant and inherent frequency demonstrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010170424A CN101853595A (en) | 2010-05-11 | 2010-05-11 | Electromagnetic drive type resonant and inherent frequency demonstrator |
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| CN101853595A true CN101853595A (en) | 2010-10-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010170424A Pending CN101853595A (en) | 2010-05-11 | 2010-05-11 | Electromagnetic drive type resonant and inherent frequency demonstrator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700299A (en) * | 2013-12-07 | 2014-04-02 | 济南大学 | Physical teaching aid for demonstrating natural frequency of object |
| CN107045822A (en) * | 2017-04-17 | 2017-08-15 | 郑州航空工业管理学院 | Demonstrate the physical teaching aid of natural frequency of object and compare the method for different metal bar intrinsic frequency |
| CN110930832A (en) * | 2019-12-11 | 2020-03-27 | 中国矿业大学 | Free vibration experimental device |
-
2010
- 2010-05-11 CN CN201010170424A patent/CN101853595A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700299A (en) * | 2013-12-07 | 2014-04-02 | 济南大学 | Physical teaching aid for demonstrating natural frequency of object |
| CN107045822A (en) * | 2017-04-17 | 2017-08-15 | 郑州航空工业管理学院 | Demonstrate the physical teaching aid of natural frequency of object and compare the method for different metal bar intrinsic frequency |
| CN110930832A (en) * | 2019-12-11 | 2020-03-27 | 中国矿业大学 | Free vibration experimental device |
| CN110930832B (en) * | 2019-12-11 | 2022-04-01 | 中国矿业大学 | Free vibration experimental device |
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Application publication date: 20101006 |