Physics Lab Equipment

LEMI-24 Apparatus of Forced Vibration and Resonance

LEMI-24 Apparatus of Forced Vibration and Resonance

Features

  • Obvious physical phenomenon

  • Stable and reliable experimental data

  • Rich experiment contents, easy operation and high measurement accuracy




Introduction

Forced vibration and resonance are often used in engineering and scientific research. For example, in construction, machinery and other projects, it is often necessary to avoid resonance phenomenon to ensure the quality of the project. In some petrochemical enterprises, the liquid density and level height are detected online by using tuning-fork liquid density sensors and level sensors based on resonance phenomena. 


This apparatus uses the tuning fork vibration system as the research object, uses the electromagnetic force of the excitation coils as the driving force and uses the coil as the amplitude sensor, to measure the relationship between the vibration amplitude and the frequency of driving force of the underlying vibration system, and to study the phenomenon of vibration and resonance and its laws. This apparatus can perform the following experiments: 


1. Study the relationship between amplitude and force frequency of a tuning fork vibration system driven by a periodically external force. Measure and plot their relationship curve, and acquire the resonance frequency and the sharpness of the vibration system (this value is equal to the Q value). 

2. Measure the relationship between the vibration and the mass of symmetrical arms of the tuning fork. Acquire the relationship formula between the vibration frequency f (i.e. resonance frequency) and the block mass m attached to the tuning fork arms at a certain position. 

3. Determine the mass of a pair of mass blocks attached to the tuning fork arms by measuring the resonance frequency. 

4. Measure the resonance frequency and sharpness of the tuning fork when changing the vibration structure and increasing the damping force of the tuning fork and do comparisons.


The instruction manual contains experimental configurations, principles, step-by-step instructions, and examples of experiment results. Please click Experiment Theory and Contents to find more information about this apparatus.


Specifications

DescriptionSpecifications
Tuning fork and supportdual arms, vibration frequency about 248 – 256 Hz (without loading)
Signal generatorfrequency range 200 – 300 Hz adjustable
Frequency control &display

200 – 300 Hz, resolution 0.01 Hz

AC voltmeter

range 0 – 2000 mV, resolution 1 mV

Stainless steel damping sheetdimensions 50 mm × 40 mm × 0.5 mm, 2 pieces, attached to two arms of tuning fork using small magnets respectively
Paired mass block

6 pairs of different masses

Tuning forkdriven and sensed by electromagnetic coils


Parts List

DescriptionQtyNote
Main electric unit1
Mechanical stage1
Mass block6 pairsdifferent mass for each pair
Thin stainless plate
2
Magnetic steel2diameter 18 mm, Neodymium magnet
BNC cable4
Watch glass1
Allen wrench1
Power cord1
Instruction manual1


 LEMI-24-2.jpg

Relationship between amplitude and frequency

 LEMI-24-3.jpg

Relationship between the square of resonance period and arm mass

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