SD-4.13A Free & Forced Vibration Apparatus

 

SD-4.13A Free & Forced Vibration Apparatus

The Free and Forced Vibration Apparatus has been developed to extend the range of demonstrations and experiments which may be carried out to include the free and forced vibrations of a single degree of freedom with viscous damping.

Description

The Free and Forced Vibration Apparatus has been developed to extend the range of demonstrations and experiments which may be carried out to include the free and forced vibrations of a single degree of freedom with viscous damping.

Simple adjustments can be made to the apparatus and the motion of the mass can be readily observed and recorded on the two pen recorders provided. The use of so called “Black Boxes” has been avoided, a feature welcomed by most teachers.

Adopting the well tried features of the simple Vibration Apparatus, the mass carriage is constrained by rollers on vertical guide ways to provide minimum uncontrolled damping. Variable viscous damping is provided by an oil dashpot.

Two methods of exciting forced vibration are adopted; either by oscillating the upper spring mounting with SHM at variable frequency or by applying a rotating out balance force at variable frequency to the vibrating mass.

Two pen recorders are provided, a continuous paper recorder for amplitude and frequency measurements and a rotating drum recorder for amplitude and phase measurements.

Technical Specifications

Features & Benefits

Downloads

Experiment 1
To investigate the relationship between the mass of the body, the stiffness of the spring and the periodic time or frequency of the oscillation of a simple spring-mass system having one degree of
freedom.
Experiment 2a
To investigate the effect of viscous damping on the free vibration of a simple springmass-damper system.
Experiment 2b
(b) To determine the damping ratio or factor for a given spring-mass-damper system.
Experiment 3a
To investigate the relationship between the
amplitude of the steady state vibration of the
vibrating mass and the forcing frequency for
varying damping ratios.
(a) Vibrations induced by applying a periodic
disturbing force to the mass.
In this experiment the exciter unit is driven
from a gearbox via a flexible coupling such
that one revolution of the contra rotating
discs is equal to one revolution of the
phase recorder.
Experiment 3b
Vibrations induced by a periodic displacement of the point of support of the spring. In this experiment a connecting rod, driven by an eccentric, imparts a sinusoidal input to the upper mounting of the spring such that one revolution of the eccentric is equal to one revolution of the phase recorder.
Experiment 4
To investigate the phase relationship between the vibrating mass and the periodic displacement of the spring support for varying damping ratios.

Mounting Frame: SD – 1.10

SD4.13A: 220-240V/1ph/50Hz

SD4.13B: 120V/1ph/60Hz

SD4.13G: 220-240V/1ph/60Hz

Packed and crated shipping specifications

Volume: 0.89m³
Gross weight: 85Kg

Length: 0.88m
Width: 0.58m
Height: 1.24m
Net weight: 75Kg

SD4.13A

SD4.13B

SD4.13G

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