3th WCSET-2014 at Nepal
Mechanical Engineering / Sustainable Energy Session:
Title:
Design and development of eddy current semi active
damper
Authors:
B. Rajendra, K. K. Appukuttan
Abstract:
Vibration isolation has been one of the major challenges
for engineers in the design of dynamic systems. For
effective vibration isolation, the damping factor needs
to be maximum at low frequency and minimum or zero
damping at high frequency. Passive isolations have
constant parameters of stiffness and damping
coefficients and hence they are effective only in a
narrow range of frequencies. A semi-active isolation is
more effective over a wide range of frequencies. An
active damper is an ideal solution for such a situation.
But its high cost, large power consumption and stability
requirements makes it impractical for general
applications. This paper deals with the design and
development of an eddy current semi-active damper. When
used in conjunction with passive damper, semi-active
dampers provide a fail-safe damping effect in case of
power failures. The eddy current damping provides an
adjustable suspension system with variable damper
characteristics. The design involves the
characterization of the damper as the function of field
strength. The field strength is controlled by varying
the current in the electro magnets of the damper. The
transient response is obtained by impulse test and
validated experimentally. This damper can be used as an
attachment for existing passive isolation which enhances
the capability of isolation.
Keywords: Semi-Active
Damping, Eddy Current Damping, Flux Density, Time
Response Curve
Pages:
384-387