optimal design of a damped dynamic vibration absorber
DESCRIPTION
Optimal Design of a Damped Dynamic Vibration AbsorberTRANSCRIPT
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Optimal design of a damped dynamic vibration absorber for vibration control of structure excited by ground motion
BY- SHRIKANT DHOLE
GUIDED BY- M C RAY AND K RAY
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INTRODUCTION
1 •What are dynamic vibration absorbers?
2 •Undamped dynamic vibration absorber
3 •Traditional damped dynamic vibration absorber
4 •A variant form of the damped dynamic vibration absorber
5 •Comparison
6 •Conclusion
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What are dynamic vibration absorbers?
A machine or a system may experience
excessive vibration if it undergoes resonance. In
such cases the vibration of machine or system
can be reduced by using
a vibration absorber.
Dynamic Vibration Absorbers (DVA) are
based on the concept of attaching a secondary
mass to a primary vibrating system such that the
secondary mass dissipates the energy and thus
reduce the amplitude of vibration of the primary
system.
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Undamped dynamic vibration absorber
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Traditional damped dynamic vibration absorber
• Undamped vibration absorber introduces two new peaks thus the machine experiences large amplitudes as it passes through the first peak during the start up and stopping.
• Undamped absorber has poor bandwidth.• Small damping extends bandwidth.• But, ruins complete absorption of motion.• Becomes a design problem to pick the most favorable ℓ, ζ, ξ.
(optimum ratio of natural frequency (ζ) and optimum damping (ξ) )
Why damping in the absorber ?
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Traditional damped dynamic vibration absorber
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Traditional damped dynamic vibration absorber
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Traditional damped dynamic vibration absorber
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A variant form of the damped dynamic vibrationabsorber
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A variant form of the damped dynamic vibrationabsorber
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A variant form of the damped dynamic vibrationabsorber
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A variant form of the damped dynamic vibrationabsorber
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A variant form of the damped dynamic vibrationabsorber
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Comparison
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Comparison
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Comparison
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CONCLUSION
▪ Under the optimum tuning condition of the absorbers, it is proved analytically that the proposed absorber provide a larger suppression of resonant vibration amplitude of the primary system excited by ground motion than the traditional absorber.
▪ The comparison revealed that though model B requires a larger amount of damping than model A, the resonant vibration amplitude under the optimized condition of model B is always less than that of model A. It provides an alternative design for the traditional damped dynamic vibration absorber.
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References
•W.O. Wong, Y.L. Cheung / Engineering Structures 30 (2008) 282–2861•Theory of vibration by Thomson2•Mechanical vibration by SS Rao3