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Passive Vibration Analysis Essay

2018 Words9 Pages

Experimental, analytical and FEM analysis of passive CLD, FLD and patched layer treatment to reduce vibrations with different viscoelastic materials Pankaj R. Beldar, Prof.D.V.Kushare ABSTRACT- Vibrations of structures may cause many problems such as structural fatigue, unbalanced forces in machines, external excitations. It is important to reduce these unwanted vibrations, in order to increase the lifetime of structures. One of the technique adapted for the suppress severity of vibration is passive vibration technique which is used in structural dynamics to control vibration. Passive damping method is adding a layer of damping which is highly dissipative material like viscoelastic material and applied to metal objects to increase the damping in the total structure. Adding …show more content…

Properties of butyl rubber in transition region are given below. Properties are checked by standards on cyclic loading machine to calculate storage modulus and loss modulus.as Complex modulus= storage modulus (real) +loss modulus (imaginary) Butyl rubber Properties at 10 hz Storage modulus= 6.6892Mpa Shear modulus= 2.2365Mpa Loss factor= 0.185755 Similarly butyl rubber, buna nitrile, silicon rubber, natural rubber, PVC, SBR core is used for making specimens. After testing whose damping factor is more that material is selected for checking FLD and PATCH layer effect. Fig 2: experimental set up For experimental analysis is done on NILAB view modal analysis model at modern college of enginnering, pune. All the material properties are checked by reputed testing labs in pune, Mumbai and nashik. Experimental results are damping loss factors and natural frequencies. From MATALB coding modal analysis of undamped beam is done. And then another MATLAB code is generated for ross kerwin ugler model of viscoelasticity to calculate damping loss factor. [3] MATHEMATICAL

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