CONTROLE DE ACELERAÇÃO DE UMA MÁQUINA DE VIBRAÇÃO ELETRODINÂMICA / ACCELERATION CONTROL OF AN ELECTRODYNAMIC VIBRATION MACHINE

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

This work presents the development of a novel digital acceleration controller for sinusoidal vibration tests using switching-mode AC power source (ACPS) fed electrodynamic vibration machines. The proposed scheme is based on the interaction of two control loops: one for the shaker s acceleration regulation and another for the ACPS output voltage control. A robust model reference adaptive algorithm (RMRAC) is used in the voltage control loop. To reduce the eects caused by the plant s parameters variations as well harmonic vibrations and resonances of the test specimen, the acceleration feedback controller is augmented with a feedforward and a robust controller. Experimental results show that the proposed system is capable to achieve excellent acceleration reference tracking performance and robustness in the closed loop control from 20 Hz to 200 Hz. Investigations shall be performed to evaluate the response of this scheme when controlling vibrations as fast as 2000 Hz. A specic instrumentation system has been developed to feedback the electrodynamic vibration machine s acceleration. The proposed solution employs piezoelectric accelerometers, voltage mode preampliers, circuit for signal conditioning, analog to digital conversion and ltering. A study concerning the commonly used vibration measurement techniques and the design procedure, simulation, implementation and experimental results are described in detail.

ASSUNTO(S)

controle feedforward robust model reference adaptive control acelerômetros piezoelétricos ensaios de vibração switching-mode ac power source vibradores eletrodinâmicos vibration tests piezoelectric accelerometer fontes de potência ca com comutação controle adaptativo robusto por modelo de referência engenharia eletrica electrodynamic shaker feedforward control

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