CN216211792U - Sound wave visual teaching aid - Google Patents
Sound wave visual teaching aid Download PDFInfo
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- CN216211792U CN216211792U CN202122725500.XU CN202122725500U CN216211792U CN 216211792 U CN216211792 U CN 216211792U CN 202122725500 U CN202122725500 U CN 202122725500U CN 216211792 U CN216211792 U CN 216211792U
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- circular tube
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- 230000000007 visual effect Effects 0.000 title claims abstract description 8
- 239000006260 foam Substances 0.000 claims abstract description 28
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 5
- 239000003595 mist Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 238000011160 research Methods 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000001902 propagating effect Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
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- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The utility model discloses a sound wave visual teaching aid. The traditional Kuntt tube is fixed in length, can only measure acoustic standing waves with wavelengths of a certain multiple, and has limitations. The utility model comprises a transparent round tube, a plug, a piston plate, a piston rod, a Bluetooth sound box and a foam ball. The outer wall of the transparent circular tube is provided with scales along the axial direction. The plug is detachably arranged at one end of the transparent round tube, and one end of the transparent round tube is sealed. The piston plate is arranged in the transparent circular tube, the piston rod is fixedly connected with the center of the piston plate, and the piston plate moves along the axial direction of the transparent circular tube under the pushing of the piston rod. The Bluetooth sound box and the foam ball are arranged in a space between the plug and the piston plate in the transparent round tube; the foam balls are a plurality of antistatic treated light foam balls. The utility model has simple manufacture and obvious experimental effect, can qualitatively and quantitatively research the standing wave property and can make students understand the formation of standing waves to a greater extent.
Description
Technical Field
The utility model belongs to the technical field of educational instruments, particularly relates to the field of physical teaching instruments, and particularly relates to a sound wave visual teaching aid.
Background
In 1866, the german scientist was the first to use the vibration phenomenon of a foam ball in a glass tube to make sound step from intangible to tangible, and the experiment that the sound propagation speed in the air is measured by measuring the distance between standing wave nodes in the tube is collectively called the Kuntt tube experiment. However, the sound wave is a part of the physics of the university nowadays, and is difficult for students to master due to the abstraction, and corresponding teaching aids are often needed to help the students to better understand the knowledge of the sound wave. The pipe length has been fixed to traditional Kuntt's pipe to can only measure the acoustic standing wave of certain multiple wavelength, the effect is not too good, hardly attracts student's attention, has the limitation.
Disclosure of Invention
The utility model aims to provide a sound wave visualization teaching aid aiming at the problems in the background technology.
The utility model comprises a transparent round tube, a plug, a piston plate, a piston rod, a Bluetooth sound box and a foam ball.
The transparent circular tube is a glass tube or an acrylic tube, and scales are arranged on the outer wall of the transparent circular tube along the axial direction.
The plug is hemispherical, the plug is detachably arranged at one end of the transparent circular tube, the spherical surface faces towards the inside of the circular tube, and one end of the transparent circular tube is sealed by the plug.
The piston plate is arranged in the transparent circular tube, the piston rod is fixedly connected with the center of the piston plate, and the piston plate moves along the axial direction of the transparent circular tube under the pushing of the piston rod.
The Bluetooth sound box and the foam ball are arranged in a space between the plug and the piston plate in the transparent round tube; the foam balls are a plurality of antistatic treated light foam balls.
The utility model modifies the traditional Kuntt tube: (1) changing a sound source, and playing fixed audio sound waves on the mobile phone APP by using a loudspeaker to enable the foam small balls in the pipe to vibrate to form a standing wave image; (2) the improvement is that the length of the pipe is variable, the tail part is changed from sealing into a piston device, and the length of the pipe is changed to obtain the acoustic standing waves with different frequencies; (3) scales are added, and scale marks are added on the outer portion of the tube wall, so that quantitative research is facilitated. The improved teaching aid is simple to manufacture, has obvious phenomenon, can qualitatively and quantitatively research standing wave properties, and can enable students to understand the formation of standing waves to a greater extent and stimulate the innovativeness of the students.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The utility model is further described below with reference to the following figures and examples.
As shown in figure 1, the acoustic wave visual teaching aid comprises a transparent round tube 1, a plug 2, a piston plate 3, a piston rod 4, a Bluetooth sound box 5 and a foam ball 6.
The transparent circular tube 1 is a glass tube or an acrylic tube, and the outer wall of the transparent circular tube 1 is provided with scales along the axial direction. This example uses an acrylic tube having an outer diameter of 9cm and an inner diameter of 8cm and a length of 100 cm.
The plug 2 is hemispherical, the plug 2 is detachably arranged at one end of the transparent circular tube 1, the spherical surface faces towards the inside of the circular tube, and the plug 2 seals one end of the transparent circular tube 1.
The piston plate 3 is arranged in the transparent circular tube 1, the piston rod 4 is fixedly connected with the center of the piston plate 3, and the piston plate 3 moves axially along the transparent circular tube 1 under the pushing of the piston rod 4. The piston plate of this example was an acrylic plate having a thickness of 0.5cm and a diameter of 7.98 cm.
The Bluetooth sound box 5 and a plurality of foam balls 6 are arranged in the space between the plug 2 and the piston plate 3 in the transparent round tube 1. The foam ball 6 is an antistatic treated light foam ball with the diameter less than 0.5 cm. Taking a proper amount of light foam balls, spraying antistatic mist on the light foam balls, and then stirring the light foam balls until the light foam balls are dried. The treated light foam pellets were introduced into an acrylic tube to form a thin and uniform layer.
The Bluetooth sound box 5 is connected with an APP (portable) on the mobile phone to generate sine waves with certain frequency, and the sound standing wave effect formed when the frequency is 200-400 HZ is optimal.
During the experiment, connect the bluetooth speaker, send the simple tone sine wave and transfer the volume knob to the biggest with app. The sound frequency, the piston position and the pipe opening are respectively changed by a control variable method, and the sound velocity is measured according to the formed standing wave pattern. Foam balls are placed in the tube, or the loudspeaker is not completely axisymmetric, a lowest-order high-order wave mode is excited in the tube, and a sound wave field in the Kuntt tube is actually a sound wave field formed by superposition of a main wave mode and the lowest-order high-order wave mode. The excitation frequency of the Bluetooth sound box is adjusted, when the integral multiple of the 1/4 sound wave wavelength is equal to the length of the glass round tube, sound standing waves are excited in the tube, the foam beads are driven to be concentrated to an antinode area of the standing waves by a main wave mode, and the foam beads concentrated to the antinode area of the main wave standing waves are enabled to have a dynamic and stable fine structure distributed in a sheet shape in the direction perpendicular to the axis of the Kuntt tube by the existence of the lowest-level high-order wave mode.
When a relatively obvious and stable standing wave phenomenon occurs, the distance d between two adjacent nodes of the standing wave can be measured, the wavelength λ of the sound wave is obtained as 2d, and the sound velocity v is calculated as f × λ according to the known frequency.
The standing wave is a wave formed when two rows of waves of the same amplitude and the same frequency propagating in opposite directions are superposed. In order to obtain two series of waves propagating in opposite directions, and having the same amplitude and frequency, reflection of the waves is generally used. The loudspeaker produces sound to produce incident sound waves which travel along the duct to the other end and are reflected to form reflected waves, the incident and reflected waves being superimposed to form a particular train of waves, known as standing waves.
Two simple harmonics with period T, wavelength λ, amplitude a propagate in opposite directions along the X axis. The wave propagating in the positive direction of the X axis is called a right traveling wave, and the wave equation is as follows:
the wave propagating along the negative direction of the X-axis is called left-going wave, and the wave equation is:
the synthesized standing wave equation is:
it can be seen that any point on the synthesized wave makes simple harmonic vibration in the same period.
The acoustic wave is a longitudinal wave, the propagation speed of which in a medium
Where ρ is density and bulk modulus
V is volume and P is pressure. If the medium is air, then B ═ γ P, the speed of sound propagation in air
In the formula (I), the compound is shown in the specification,
CPconstant pressure specific heat for air, CVThe specific heat is constant volume for air. From the ideal gas law PV ═ nRT':
proportional to the temperature T', therefore:
ρ0is the value at 0 ℃.
The following can be obtained:
wherein, T ═ 0 ℃ V0＝331.1m/s。
Namely:
t is experimental environment temperature, singlyThe bits are in degrees Celsius. And verifying the experimental result by using the calculation result.
Claims (3)
1. The utility model provides a visual teaching aid of sound wave which characterized in that: the device comprises a transparent round tube, a plug, a piston plate, a piston rod, a Bluetooth sound box and a foam ball;
the transparent circular tube is a glass tube or an acrylic tube, and the outer wall of the transparent circular tube is provided with scales along the axial direction;
the plug is hemispherical, the plug is detachably arranged at one end of the transparent circular tube, the spherical surface faces the inside of the circular tube, and the plug seals one end of the transparent circular tube;
the piston plate is arranged in the transparent circular tube, the piston rod is fixedly connected with the center of the piston plate, and the piston plate moves axially along the transparent circular tube under the pushing of the piston rod;
the Bluetooth sound box and the foam ball are arranged in a space between the plug and the piston plate in the transparent round tube; the foam balls are a plurality of antistatic treated light foam balls.
2. A visual teaching aid of sound waves as claimed in claim 1, wherein: the foam balls are light foam small balls with the diameter smaller than 0.5cm, are sprayed with antistatic mist, and are stirred to be dry.
3. A visual teaching aid of sound waves as claimed in claim 1, wherein: the Bluetooth sound box is connected with the Bluetooth of the mobile phone, and the frequency is controlled to be 200-400 HZ through the mobile phone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122725500.XU CN216211792U (en) | 2021-11-08 | 2021-11-08 | Sound wave visual teaching aid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122725500.XU CN216211792U (en) | 2021-11-08 | 2021-11-08 | Sound wave visual teaching aid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216211792U true CN216211792U (en) | 2022-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122725500.XU Active CN216211792U (en) | 2021-11-08 | 2021-11-08 | Sound wave visual teaching aid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL443029A1 (en) * | 2022-12-02 | 2024-06-03 | Uniwersytet Łódzki | Kundt's tube |
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2021
- 2021-11-08 CN CN202122725500.XU patent/CN216211792U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL443029A1 (en) * | 2022-12-02 | 2024-06-03 | Uniwersytet Łódzki | Kundt's tube |
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