SEMI-ACTIVE VIBRATION CONTROL OF A ROTATING SHAFT BY USING A MAGNETO RHEOLOGICAL DAMPER
Aldemir Ap Cavalini Jr1; Edson Hideki Koroishi2; Adriano Silva Borges2; Luiz Gustavo Pereira1; Valder Steffen Jr1
1 ederal University of Uberlandia; 2 Federal Technological University of Parana
doi:10.20906/CPS/COB-2015-1584
Resumo
In recent years, a number of methods dedicated to vibration control have been proposed in order to satisfy the increasing demand for high performance and safe operation of mechanical systems. The commonly used techniques present similar attenuation capability. However, they can be classified according to the employed actuator. Thus, this work is dedicated to semi-active vibration control of rotating shafts by using a magneto rheological damper as actuator. This kind of actuator, or damper, is able to change its damping and stiffness properties when subjected to a magnetic field. Several mathematical models were proposed to represent the rheological properties of this kind of actuator. However, in this work the modified Bouc-Wen model is used (i.e., a model widely used to describe smoothly hysteretic behavior). A rotor composed by a horizontal flexible shaft, two rigid discs, and two self-aligning ball bearings is used to demonstrate the efficiency of the proposed control approach. A finite element model is used to obtain the numerical dynamic responses of the rotating machine. The control effort was determined by using Fuzzy Logic Control, which was developed as based on Takagi-Sugeno model. The present method requires the states of the system to determine the control effort. The Fuzzy rules took into account two situations: "action" (i.e., application of the control effort) - when the measured displacements and velocities assume a positive or negative values, and "no action" - for the displacements and velocities presenting positive and negative or negative and positive values. The results of the control strategy conveyed show that the magneto rheological damper is a reliable alternative for vibration control of flexible shafts of rotating machines.
Palavras-chave: rotating machines; semi-active control; magneto rheological damper; fuzzy control approach