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String vibration tester

A tester and string vibration technology, applied in the field of teaching test instruments, can solve the problems of incompatibility of flashing frequency and time, observation and measurement, and inability to adjust flashlight brightness, so as to achieve good frequency matching, prolonged service life, and accurate measurement. Effect

Inactive Publication Date: 2015-12-30
SANJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the device is that the flashing light cannot match the vibration frequency well in terms of flashing frequency and time, and the brightness of the flashing light cannot be adjusted, so the experimental phenomena cannot be clearly observed and measured

Method used

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Embodiment Construction

[0010] A kind of string vibration tester of the present invention, its structural schematic diagram is as figure 1 As shown, it includes a signal source, a vibrating string and a test bench, a combination of a string bracket and a ruler, a combination of hook codes, and an LED lighting lamp connected to the signal source with adjustable frequency and brightness.

[0011] The signal interface of the signal source outputs a sine signal; there are binding posts 1, strong magnets 4 and pulleys 6 with grooves on the vibrating string and the test bench; the string bracket ruler combination includes the string fulcrum 3 and the ruler 7; the hook code combination It includes a weight plate 5; the LED lighting lamp is connected to the strobe interface of the signal source, and the strobe interface of the signal source provides the lighting signal of the LED lamp. The signal is a square wave signal, and the frequency is continuously adjustable between 1-200 Hz.

[0012] A uniform metal ...

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Abstract

The invention relates to a string vibration tester. The string vibration tester comprises a signal source, a vibration string, a test board, a string support ruler combination, and a hook weight combination. The string vibration tester is characterized in that the string vibration tester also comprises an LED illuminating lamp connected with the signal source, and the frequency and the brightness of the LED illuminating lamp are adjustable. Alternating current is applied to a stressed metal conducting wire in a magnetic field, and the conducting wire vibrates under the effect of the Ampere force. The string generates stable standing waves within the effective length via the adjustment of the pulling force of the string and the adjustment of the frequency of alternating current of the string, the LED illuminating lamp with adjustable frequency and brightness is additionally provided so that the vibration process of the string can be clearly observed, the resonance point of the standing waves is more easily found out, and the measurement is more accurate. LED illumination signals and sine signals are from the same CPU so that the match of the vibration frequency and the strobe frequency is very good, the frequency of the standing waves can be stably and clearly tested through the observation of the phenomenon of vibration via a strobe lamp, and the brightness of the LED lamp is adjustable.

Description

technical field [0001] The invention relates to a teaching test instrument, more specifically, a string vibration test instrument. Background technique [0002] At present, the method of measuring string vibration test generally adopts the following method: fix a section of a steel wire string to a vibration source with adjustable frequency, and hang the other end through a pulley to a hook that can hold weights, and then start the vibration source to make the steel wire vibrate. Understand the law of vibration propagation on the string and change the frequency and tension of the fixed string, measure the constant wave propagation speed and linear density on the uniform string. The disadvantage of the device is that the flashing light cannot match the vibration frequency well in terms of flashing frequency and time, and the brightness of the flashing light cannot be adjusted, so the experimental phenomena cannot be clearly observed and measured. Contents of the invention ...

Claims

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Application Information

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IPC IPC(8): G09B23/06
Inventor 夏卿
Owner SANJIANG UNIVERSITY
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