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Vibration Damping Lab Report

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ABSTRACT Vibrations are very common in every machine component and structure, so to overcome these vibration, vibration damping are reviewed, Chatter vibrations are generates in every machine tool structure, which results in decrease the tool life and quality of operation. Decrease in tool life and quality of operation is not a desired condition, so vibration damping is necessary to overcome these types of chatter vibrations. This includes need of vibration damping and benefit of the same. Keywords: Chatter vibrations, machine tool structure, and vibration damping …show more content…

The various reviews on need of damping are discuses. Damping is an energy absorbing mechanism and a reduction in the amplitude an oscillations or vibration as a result of Energy being dissipated as heat. The polymer layers are able to restrain bending vibrations [3]. For polymers of the highest damping, the full width at half maximum of the damping peak at constant frequency may be only about 180 C. Passive damping properties of composite materials are important because the damping properties affect their sound transmission loss, especially in the critical frequency range, and also their vibration response to excitation [4]. To reduce response of vibrations a Tuned mass damper (TMD) is required which is a passive …show more content…

The damping force is constant in magnitude but opposite in direction to that of the motion of the vibrating body. It either caused by friction between rubbing surfaces that are dry or have insufficient lubrication. The damping force is equal to the product of the normal force and the coefficient of friction and assumed independent of the velocity, once the motion initiated. 3.3 Structural Damping The damping caused by the friction between the internal planes that slip or slide as the material deforms called solid or structural damping. When the materials are deformed, energy is absorbed and dissipates by the material itself. The effect is due to friction between the internal planes, which slip or slide as the deformations take place. In addition, damping of a system may be describe through the following system 3.4 Over damped A system is said to be a over damped if the system returns to equilibrium positions without oscillating. 3.5 Critically damped A system is said to be a critically damped if the system returns to equilibrium as quickly as possible without

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