String vibration research experiment instrument

Abstract

The utility model relates to the technical field of vibration test equipment, and discloses a string vibration research experiment instrument, which comprises a base, an electronic vibration source mounted at one end of the upper side of the base, a string mounted at the vibration output end of the electronic vibration source, and a tension sensor mounted at the other end of the upper side of the base. Two guide rails are installed on the upper side of the base, a first sliding block and a second sliding block are slidably installed on the outer sides of the two guide rails, reflecting plates are installed on the upper sides of the first sliding block and the second sliding block respectively, and a chord line penetrates through the two reflecting plates. Compared with the prior art, the vibration source has the advantages that the frequency change range is large, the vibration frequency can be continuously and finely adjusted, and the like; the vibration frequency is directly displayed by a nixie tube, and frequency data is stable and reliable; the tension can be continuously adjusted; the device can measure the resultant force of the pulling force and the restoring force of the string, and reduces the friction force between the string and the pulley in the original device, thereby reducing the system error.

Description

Technical Field

[0001] This utility model relates to the technical field of vibration testing equipment, specifically to a string vibration research experimental instrument. Background Technology

[0002] Vibrations exist everywhere in nature. Broadly speaking, any periodic change of a physical quantity over time can be called a vibration. The propagation of a certain vibration is called a wave, such as mechanical waves and electromagnetic waves. Various forms of waves share many common characteristics and laws, such as having a certain propagation speed, being accompanied by energy propagation, and producing phenomena such as reflection, refraction, interference, and diffraction. When the wave intensity is low, wave propagation is independent. The superposition of several waves can produce many unique phenomena; standing waves are one example.

[0003] The study of wave propagation laws on strings is an important experiment in mechanics and is a required experiment in the national comprehensive university physics experimental teaching syllabus. This instrument focuses on observing standing waves formed on strings and experimentally determining the relationships between the standing wave wavelength and tension, the standing wave wavelength and vibration frequency, and the standing wave wavelength and string density during string vibration. It also aims to help students master the method of measuring transverse wave wavelengths using the standing wave principle. This method has important applications not only in mechanics but also in experiments in acoustics, radio, and optics.

[0004] In traditional devices, the tension on the string is changed by altering the weight of the weights, i.e., changing the mass of the weights. Since the mass of the weights cannot be infinitely small, the tension on the string can also change continuously and infinitely small. That is, the tension exhibits a quantized phenomenon with the weight of the smallest weight as the unit. Furthermore, treating the weight of the weights as the tension on the string ignores the restoring force generated by the deformation of the string, resulting in a large systematic error.

[0005] To prevent the phenomenon of quantization based on the weight of the smallest weight and to reduce systematic errors, this application proposes an experimental apparatus for studying string vibrations. Utility Model Content

[0006] I. Technical problems to be solved

[0007] The technical problem to be solved by this invention is to prevent the phenomenon of quantization based on the weight of the smallest weight and to reduce system error.

[0008] II. Technical Solution

[0009] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a string vibration research experimental instrument, including a base, an electronic vibration source is installed at one end of the upper side of the base, a string is installed at the vibration output end of the electronic vibration source, a tension sensor is installed at the other end of the string, and the tension sensor is installed at the other end of the upper side of the base;

[0010] Two sets of guide rails are installed on the upper side of the base. Slider 1 and slider 2 are slidably installed on the outer side of the two sets of guide rails. Reflectors are installed on the upper side of slider 1 and slider 2 respectively. The string passes through the two sets of reflectors.

[0011] As an improvement, a mounting block is installed on the other end of the upper side of the base, and a threaded shaft is installed on the connection end of the tension sensor. The threaded shaft passes through the mounting block and a tension adjusting nut is fitted on the outside of the threaded sleeve.

[0012] As an improvement, the reflector is provided with multiple sets of through holes of different diameters, and the string passes through the through holes of the corresponding size.

[0013] As an improvement, the string is installed as a vibrating spring at the vibration output end of the electronic vibration source, the first slider is close to the vibrating spring on the electronic vibration source, and the second slider is located on the side of the first slider away from the electronic vibration source.

[0014] As an improvement, the electronic vibration source is connected to the vibration power supply via a wire, the frequency of the electronic vibration source is continuously adjustable from 0 to 300 Hz, and the tension sensor is connected to the tension measuring instrument via a wire.

[0015] III. Beneficial Effects

[0016] The advantages of this utility model compared with the prior art are as follows:

[0017] 1. A microcontroller is used to control the vibration frequency, and an electromagnetically driven vibrating reed serves as the vibration source. This vibration source has advantages such as a large frequency variation range and continuous fine-tuning of the vibration frequency. It can be used to study the relationship between standing wave wavelength and vibration frequency, string linear density, and string tension. Using guitar strings as the strings allows for experiments to study standing waves and timbre at different frequencies, enriching the experimental content.

[0018] 2. The vibration frequency is directly displayed by a digital tube, and the frequency data is stable and reliable. The string vibration experiment is conducted on a specially designed experimental platform with an aesthetically pleasing and reliable structure.

[0019] 3. By using an adjustable structure to stretch the central shaft of the force-sensitive sensor, the tension of the string can be tightened or loosened, thus achieving continuous adjustment of the tension;

[0020] 4. It can measure the resultant force of tension and restoring force on the string while reducing the friction between the string and the pulley in the original device, thereby reducing system error. Attached Figure Description

[0021] Figure 1 This is a top view schematic diagram of the experimental apparatus for studying string vibration according to this utility model.

[0022] Figure 2 This is a schematic diagram of the main structure of a string vibration research experimental instrument according to this utility model.

[0023] Figure 3 This is a schematic diagram of the slider structure of a string vibration research experimental instrument according to this utility model.

[0024] Figure 4 This is a schematic diagram of the vibration power supply panel of a string vibration research experimental instrument according to this utility model.

[0025] Figure 5 This is a schematic diagram of the tension measuring instrument panel of a string vibration research experimental apparatus according to this utility model.

[0026] As shown in the figure: 1. Base; 2. Electronic vibration source; 3. Mounting block; 4. Tension sensor; 5. Tension adjusting nut; 6. String; 7. Guide rail; 8. Slider one; 9. Slider two; 10. Reflector. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0028] As attached Figure 1 Appendix Figure 2 and attached Figure 3 As shown, a string vibration research experimental instrument includes a base 1, an electronic vibration source 2 is installed at one end of the upper side of the base 1, a string 6 is installed at the vibration output end of the electronic vibration source 2, a tension sensor 4 is installed at the other end of the string 6, and the tension sensor 4 is installed at the other end of the upper side of the base 1.

[0029] Two sets of guide rails 7 are installed on the upper side of the base 1. Slider 1 8 and slider 2 9 are slidably installed on the outer side of the two sets of guide rails 7. The string 6 is installed as a vibrating spring at the vibration output end of the electronic vibration source 2. Slider 1 8 is close to the vibrating spring on the electronic vibration source 2. Slider 2 9 is located on the side of slider 1 8 away from the electronic vibration source 2. Reflector plates 10 are respectively installed on the upper side of slider 1 8 and slider 2 9. The string 6 passes through the two sets of reflector plates 10.

[0030] With the above structure, the electronic vibration source 2 drives the string 6 to vibrate through a continuously adjustable frequency. Slider 8 serves as the starting point for wavelength reading, and slider 9 moves on the guide rail 7 to adjust for the optimal stable wave. It is also used to reflect the wave output by the vibration source. During the experiment, slider 8 and slider 9 are fixedly installed on the upper side of the base 1 by clamping bolts. The tension of the string 6 in the horizontal direction is measured by the tension sensor 4. The specific structure is as follows:

[0031] Combined with appendix Figure 1 As shown, an installation block 3 is installed on the other end of the upper side of the base 1, and a threaded shaft is installed on the connecting end of the tension sensor 4. The threaded shaft passes through the installation block 3 and a tension adjusting nut 5 is fitted on the outside of the threaded shaft. The tension adjusting nut 5 drives the tension sensor 4 to move laterally, and the tension sensor 4 pulls the string 6 to change the tension of the string 6.

[0032] The reflector plate 10 is provided with multiple sets of through holes of different diameters. The string 6 passes through the through holes of the corresponding size. The appropriate hole diameter is selected according to the thickness of the string. In order for the string to pass through the hole and for the reflector plate of the slider to be in the center position, the two screws at the bottom of the reflector plate can be loosened so that it can automatically correct itself to the center position and then be tightened after correction.

[0033] Combined with appendix Figure 4 and attached Figure 5 As shown, the electronic vibration source 2 is connected to the vibration power supply via a wire. The vibration power supply outputs a stable and continuously adjustable frequency, allowing the frequency of the electronic vibration source 2 to be continuously adjusted from 0 to 300 Hz. The tension sensor 4 is connected to the tension measuring instrument via a wire. The data from the tension sensor 4 is transmitted to the tension measuring instrument, and the tension value is displayed on the display screen of the tension measuring instrument.

[0034] The specific usage method is as follows:

[0035] During the experiment, connect the input plug of base 1 to a 220V AC power supply, and connect the output terminal to the aircraft mount on the main unit. Turn on the vibration power supply. The digital display on the vibration power supply panel shows the vibration frequency of the vibration source. Adjust the frequency via the panel as needed to change the vibration frequency of the electronic vibration source 2. When vibration is not needed, press the reset button on the panel to reset.

[0036] When the vibration reed resonates and causes the amplitude to be too large, rotate the knob on the panel counterclockwise to reduce the amplitude for easier experimentation. When not operating at the resonant frequency point, adjust the amplitude knob on the panel to the maximum output to fix the frequency of the electronic vibration source 2. Adjust the tension adjusting nut 5 of the experimental device to change the tension on the string 6. Each time the tension is changed, adjust the position of slider 2 9 to make the string 6 on the platform exhibit a large and stable standing wave. At this time, record the vibration frequency on the vibration power supply, the tension on the string 6 on the tension measuring instrument, the length of the string 6 that produces an integer multiple of half wavelength, and the half-wave number.

[0037] Using the same method, the tension of string 6 was fixed, and the frequency of electronic vibration source 2 was changed to conduct a similar experiment.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0040] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An experimental apparatus for studying string vibrations, comprising a base (1), characterized in that: An electronic vibration source (2) is installed on one end of the upper side of the base (1). A string (6) is installed on the vibration output end of the electronic vibration source (2). A tension sensor (4) is installed on the other end of the string (6). The tension sensor (4) is installed on the other end of the upper side of the base (1). Two sets of guide rails (7) are installed on the upper side of the base (1). Slider 1 (8) and slider 2 (9) are slidably installed on the outer side of the two sets of guide rails (7). Reflector plates (10) are respectively installed on the upper side of slider 1 (8) and slider 2 (9). The string (6) passes through the two sets of reflector plates (10).

2. The experimental apparatus for studying string vibration according to claim 1, characterized in that: An mounting block (3) is installed on the other end of the upper side of the base (1). A threaded shaft is installed on the connecting end of the tension sensor (4). The threaded shaft passes through the mounting block (3) and a tension adjusting nut (5) is fitted on the outside of the threaded sleeve.

3. The experimental apparatus for studying string vibration according to claim 1, characterized in that: The reflector (10) is provided with multiple sets of through holes of different diameters, and the string (6) passes through the through holes of the corresponding size.

4. The experimental apparatus for studying string vibration according to claim 1, characterized in that: The string (6) is installed at the vibration output end of the electronic vibration source (2) as a vibrating spring. The first slider (8) is close to the vibrating spring on the electronic vibration source (2), and the second slider (9) is located on the side of the first slider (8) away from the electronic vibration source (2).

5. The experimental apparatus for studying string vibration according to claim 1, characterized in that: The electronic vibration source (2) is connected to the vibration power supply via a wire. The frequency of the electronic vibration source (2) is continuously adjustable from 0 to 200 Hz. The tension sensor (4) is connected to the tension measuring instrument via a wire.

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