International Research Journal of Engineering and Technology (IRJET) Volume: 04 Issue: 03 | Mar -2017
e-ISSN: 2395 -0056
www.irjet.net
p-ISSN: 2395-0072
Design of Semi-Automatic Vibration Absorber by using FEA R. S. Autade1, S. A. Pawar2, A. B. Atpadkar3 Asst. Professor, Dept. of Mechanical Engineering, Fabtech college of engg., Maharashtra, India. Asst. Professor, Dept. of Mechanical Engineering, Fabtech college of engg., Maharashtra, India. 3 Asst. Professor, Dept. of Mechanical Engineering, Fabtech college of engg., Maharashtra, India. 1 2
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Abstract – When any elastic body such as spring, shaft or
products, the lifetime of the machine and the environment.
beam, is displaced from the equilibrium position by the
A solution to this problem can be found in the application
application of external forces & then released, it commences
of dynamic vibration absorber (DVA). A
cyclic motion. Such cyclic motion of body or a system, due to
construction that can be mounted on the vibrating
elastic deformation under the action of external forces, is
machine and which is connected to a controller. Whenever
known as vibration.
the vibration characteristics of the machine change, the
DVA is a
controller adjusts the DVA so that the vibrations get
The dual mass vibration absorber can be effectively used to
damped as good as possible. The aim is to design active
reduce the vibration of the beam. This absorber is tuned to
DVA.
excitation frequency by moving the dual masses in or out easily. The experimental result shows that around the
1.1 PRINCIPLE OF ABSORBER:
absorber attachment location the vibration of beam become
As shown in Fig 1.1 a sinusoidal force F osinwt acts on an
negligible. This absorber also reduces the vibration of beam
undamped
other than attachment point.
absorber mass attached).When the forcing equal the
Key Words: Active DVA, passive DVA, mode shapes etc.
natural frequency of the main mass the response is infinite
main
mass-spring
system
(without
the
1. INTRODUCTION When any elastic body such as spring, shaft or beam, is displaced from the equilibrium position by the application of external forces & then released, it commences cyclic motion. Such cyclic motion of body or a system, due to elastic deformation under the action of external forces, is known as vibration.
Fig 1.1 Principal of vibration absorber
are operating they create
This is called resonance, and it can cause server problems for
vibrations. In some cases these vibrations have a negative
vibrating system. When an absorbing mass-spring system is
influence on the performance of the machine. For instance,
attached to main mass and the resonance of the absorber is
in a milling machine the whole construction vibrates when
tuned to match that of the main mass, the motion of the main
the tool rotates and material is cut. This can have a
mass is reduced to zero at its resonance frequency. Thus, the
negative impact on the precision of the manufactured
energy of the main mass is apparently "absorbed" by the
When machines
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