CN1317772A - 2D standing wave demonstrator - Google Patents
2D standing wave demonstrator Download PDFInfo
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- CN1317772A CN1317772A CN 00105823 CN00105823A CN1317772A CN 1317772 A CN1317772 A CN 1317772A CN 00105823 CN00105823 CN 00105823 CN 00105823 A CN00105823 A CN 00105823A CN 1317772 A CN1317772 A CN 1317772A
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- standing wave
- string
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Abstract
A 2D standing wave demonstrator is composed of standing-wave signal generator to generate two kinds of sine current with 15-160 H2 of frequency and continuously adjustable ampletude, electric vibrator, vibrating string and flushing lamp. Under the drive of sine current, the linear vibrator drives the lever above it to do simple harmonic vibration and the vibrating string whose both ends are linked to the vibrator is driven to generate 2D standing waves without mutual interference. Said flushing lamp is used to radiate the vibrating string for observing slow waving or wave-fixing effect.
Description
The present invention is a kind of physical teaching aid of demonstrating the bidimensional mechanical wave.It is by standing wave signal generator (two paths of signals), and the electrodynamic type Vib. vibrates compositions such as string and sudden strain of a muscle frequency lamp.Signal generator produces frequency (15-160Hz), and the continuously adjustable sinusoidal current of amplitude removes to drive linear vibrator and makes top lever do simple harmonic oscillation, drives the string that links to each other and produces standing wave.The two ends that the invention is characterized in the vibration string link to each other with electrovibrator respectively, and the lever direction of vibration is orthogonal, makes string at vertical plane and surface level.Produce the 2 D standing wave mutually noninterfere, demonstration ripple independence propagation principle adopts and dodges the vibration of light irradiation string frequently, the effect that can watch slow fluctuation or fix.
Unrestricted because of the standing wave size, be made into large-scale Standing wave demonstration experimental provision, utilize characteristic sudden strain of a muscle band electronic device, its visibility is big, and is more visual in image.The feature of demonstration standing wave, the vibration situation that can watch the particle on the vibration string, the slowly standing wave that carries out or " fixing " effect visual pattern.In addition, be mutually the bidimensional polarization Standing wave demonstration of 90 degree, can very clearly demonstrate the independence propagation principle of fluctuation, it seems from top and side, all be the stationary wave vibration of standard, but watch that synthetic after vibration is quite complicated from other angles, particularly the 2 D standing wave number not simultaneously, it is also more marvellous to dodge yupin effect.During an independent oscillator on observing the vibration string, can see synthetic (the reason Sa territory figure) of ripple.
Purpose:
As the principle and the feature of physical teaching aid demonstration 2 D standing wave, standing wave, the independence propagation principle of ripple, and synthetic (the reason Sa territory figure) of demonstration ripple can be watched simultaneously for many people.Content:
The present invention is a kind of physical teaching aid of demonstrating 2 D standing wave, mainly is made up of standing wave signal generator (two paths of signals), electrodynamic type Vib., vibration string and sudden strain of a muscle frequency shot-light etc.Wherein the principle of standing wave signal generator (Fig. 1) is to utilize whiston bridge circuit to produce sinusoidal current, puts with two power again, exports high-power electric current.By adjusting knob, can distinguish the size of regulating frequency and amplitude.Its connection jaws place (Fig. 2) connects electrodynamic type Vib. (Fig. 4) again, can change electric energy into kinetic energy like this, forms standing wave thereby drive the vibration string.Here ingenious some characteristics of having utilized loudspeaker are fixed a vibrations lever on loudspeaker, by the vibrations of loudspeaker, drive lever and do simple harmonic oscillation, form standing wave thereby drive the vibration string.Fix two electrodynamic type Vib.s that direction of vibration is vertical respectively at the string two ends, so just formed two-dimentional standing wave, wherein one road ripple is a vertical direction, and another road is a horizontal direction.When seeing from top to bottom, be a kind of waveform, when seeing from the side, be another kind of waveform, the two-way waveform does not disturb mutually, when seeing with horizontal 45, then is complicated waveform.Connect this moment and dodge shot-light (Fig. 3) frequently.If switch is dialled to keeping off down, then for dodging lamp frequently, regulate the sudden strain of a muscle frequency of lamp frequently, when equaling the standing wave frequency, the fluctuation of vibration string will " be fixed " and transfixion; Slightly high or during when the frequency of dodging lamp frequently a little less than the standing wave frequency, will see the slowly effect of fluctuation of vibration string.As if being dialled, switch is then to be the situation of penetrating by last retaining: make a support standing wave oscillation device is fixed, replace the temporary fixed of iron stand.Be contained on the support with mirror, make the classmate who watches demonstration can motionless position, just can see two kinds of waveforms simultaneously by the position of regulating mirror.Make background (black), form contrast, make waveform high-visible with string.Calibrate on the string is convenient to observe and regulate so again.Advantage:
Have only common Standing wave demonstration experimental provision at present, and most school all can not demonstrate standing wave when last physics lesson, some teachers just form ripple, very hard and very difficult success with the rope shake.Yet 2 D standing wave demonstrator can solve these difficult problems.
The standing wave signal and the electronics that utilize electronic installation to produce frequency adjustable dodge frequently, cooperatively interact, and demonstrate out perfect standing wave, dodge yupin effect; By the two-way vibration, on the vibration string, form 2 D standing wave, the independence propagation principle of demonstration ripple; Synthesizing of demonstration ripple.
The present invention demonstrates effect splendid (Fig. 5), the abstract physical knowledge that theorizes can be converted into the phenomenon intuitively of image.Make the classmate be convenient to understand.
The circuit diagram that standing wave signal generator of the present invention is used is whiston bridge circuit (Fig. 6).
Claims (5)
1. the present invention is a kind of physical teaching aid of demonstrating the bidimensional mechanical wave.It is by standing wave signal generator (two paths of signals), and the electrodynamic type Vib. vibrates compositions such as string and sudden strain of a muscle frequency lamp.Signal generator produces frequency (15-160Hz), and the continuously adjustable sinusoidal current of amplitude removes to drive linear vibrator and makes top lever do simple harmonic oscillation, drives the string that links to each other and produces standing wave.
2. the two ends that the invention is characterized in the vibration string link to each other with electrovibrator respectively, and the lever direction of vibration is orthogonal, makes string at vertical plane and surface level.Produce the 2 D standing wave mutually noninterfere, demonstration ripple independence propagation principle adopts and dodges the vibration of light irradiation string frequently, the effect that can watch slow fluctuation or fix.
3. the principle of standing wave signal generator is to utilize whiston bridge circuit to produce sinusoidal current, puts with two power again, exports high-power electric current.
4. utilized some characteristics of loudspeaker, on loudspeaker, fixed a vibrations lever,, driven lever and do simple harmonic oscillation, formed standing wave thereby drive the vibration string by the vibrations of loudspeaker.
5. improvement situation: make a support standing wave oscillation device is fixed, replace the temporary fixed of iron stand.Be contained on the support with mirror, make the classmate who watches demonstration can motionless position, just can see two kinds of waveforms simultaneously by the position of regulating mirror.Make background (black), form contrast, make waveform high-visible with string.Calibrate on the string is convenient to observe and regulate so again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00105823 CN1317772A (en) | 2000-04-13 | 2000-04-13 | 2D standing wave demonstrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00105823 CN1317772A (en) | 2000-04-13 | 2000-04-13 | 2D standing wave demonstrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1317772A true CN1317772A (en) | 2001-10-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00105823 Pending CN1317772A (en) | 2000-04-13 | 2000-04-13 | 2D standing wave demonstrator |
Country Status (1)
| Country | Link |
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| CN (1) | CN1317772A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104236588A (en) * | 2014-09-18 | 2014-12-24 | 中国人民解放军国防科学技术大学 | Determination method of directions and frequency cracking of stiff shafts of cylindrical vibratory gyro harmonic oscillator |
| CN105206141A (en) * | 2014-06-12 | 2015-12-30 | 三江学院 | String vibration tester |
| CN107633746A (en) * | 2017-09-29 | 2018-01-26 | 复旦大学 | Sound wave synthesizes and the demonstration clapped and measuring system |
| CN109192011A (en) * | 2018-11-27 | 2019-01-11 | 上海极矩教育科技有限公司 | Disymmetry axis function is at period and wave pattern demo system and method |
| CN109326182A (en) * | 2017-07-31 | 2019-02-12 | 项思明 | A kind of stationary wave experiment device, experimental method and its application |
| CN109360472A (en) * | 2018-12-19 | 2019-02-19 | 兰州大学 | A method of it is realized on string and stablizes three-dimensional standing wave |
| CN111435576A (en) * | 2019-01-15 | 2020-07-21 | 合肥探奥教育科技有限公司 | Device for demonstrating standing wave phenomenon |
-
2000
- 2000-04-13 CN CN 00105823 patent/CN1317772A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105206141A (en) * | 2014-06-12 | 2015-12-30 | 三江学院 | String vibration tester |
| CN104236588A (en) * | 2014-09-18 | 2014-12-24 | 中国人民解放军国防科学技术大学 | Determination method of directions and frequency cracking of stiff shafts of cylindrical vibratory gyro harmonic oscillator |
| CN104236588B (en) * | 2014-09-18 | 2016-12-28 | 中国人民解放军国防科学技术大学 | A kind of cylinder oscillation gyro harmonic oscillator stiff shaft orientation and the determination method of frequency cracking |
| CN109326182A (en) * | 2017-07-31 | 2019-02-12 | 项思明 | A kind of stationary wave experiment device, experimental method and its application |
| CN107633746A (en) * | 2017-09-29 | 2018-01-26 | 复旦大学 | Sound wave synthesizes and the demonstration clapped and measuring system |
| CN109192011A (en) * | 2018-11-27 | 2019-01-11 | 上海极矩教育科技有限公司 | Disymmetry axis function is at period and wave pattern demo system and method |
| CN109360472A (en) * | 2018-12-19 | 2019-02-19 | 兰州大学 | A method of it is realized on string and stablizes three-dimensional standing wave |
| CN111435576A (en) * | 2019-01-15 | 2020-07-21 | 合肥探奥教育科技有限公司 | Device for demonstrating standing wave phenomenon |
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