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Development of an adjustable neutraliser for passive vibration control

  • Bavaresco, Milena Watanabe
Publication Date
Jul 20, 2018
Repositório Digital Institucional da UFPR
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Abstract: In recent years, an increasing attention has been paid to the behaviour of thin walled tubes under many varying conditions and environments. One important topic is the vibration of the tube walls, which can be initiated in a number of ways and, if resonances are involved, can result in very significant effects. One way of reducing unwanted vibration amplitudes is to use vibration neutralisers. These are devices to be attached to the primary system in order to change its dynamics and control its vibration. The fixed points theory provides a method to calculate the viscous passive neutraliser parameters. Numerical and experimental methods are combined to predict the neutraliser behaviour. A viscoelastic material is also tested as an alternative to add damping to the device. The generalized equivalent parameters are used as an alternative model to the system, and nonlinear optimization technique provides optimum parameters for the neutraliser in a given application. Experimental results on a pipe excited by a shaker validate the neutraliser functionality for all types: undamped, with viscous damping and with viscoelastic damping. The viscous case has proven to be a simple approach considering the possibility of setting its fundamental structural properties (mass, stiffness and damping) independently. But the lack of a mathematical model to predict the damping capability, the dependability of its properties depending on installation orientation and the great amount of damping fluid that must be used to achieve high damping are considered disadvantages. The viscoelastic solution was superior on the smaller amount of material needed to achieve high damping, on the independence of installation orientation and on having a mathematical model to calculate its behavior. The disadvantage of this case relies on the high dependency between damping capability and stiffness, which makes the tuning of the viscoelastic device a more complex task. Keywords: Pipeline Vibration. Passive Control. Viscous Damping. Viscoelastic Material.

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