System identification and active vibration control of a flexible structure

Abreu, Gustavo; Conceição, Sanderson Manoel da; Lopes, Vicente; Brennan, M.J.; Alves, Marco Túlio Santana

doi:10.1590/s1678-58782012000500007

Cited by 18 publications

(14 citation statements)

References 14 publications

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“…The first rigid mass is also connected to the ground with flexible elements (b 1 and b 2 ). To control the vibrations, two electromagnetic actuators (a 1 and a 2 ) are fixed to the ground in such a way to exert forces in m 1 . In order to have magnetic forces acting at the structure, m 1 should consist of a ferromagnetic material or should have ferromagnetic material at its surfaces facing the actuators.…”

Section: Structure Actuators and Position Sensormentioning

confidence: 99%

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Vibration control of a flexible structure with electromagnetic actuators

Gruzman

Santos

2015

J Braz. Soc. Mech. Sci. Eng.

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This work presents the model of a shear frame type structure composed of six flexible beams and three rigid masses. Fixed on the ground, outside the structure, two voltage controlled electromagnetic actuators are used for vibration control. To model the flexible beams, unidimensional finite elements were used. Non-linear equations for the actuators electromagnetic force, noise in the position sensor, time delays for the control signal update and voltage saturation were also considered in the model. For controlling purposes a discrete linear quadratic regulator combined with a predictive full-order discrete linear observer was employed. Results of numerical simulations, where the structure is submitted to an impulsive disturbance force and to a harmonic force, show that the oscillations can be significantly reduced with the use of the electromagnetic actuators.

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Section: Structure Actuators and Position Sensormentioning

confidence: 99%

“…Different active methods for vibration control can be used. A widely used method consists in employing piezoelectric actuators, as shown in [1,2,7,8], where they are used in combination with different controllers. In [25] an active-passive piezoelectric network is presented.…”

Section: Introductionmentioning

confidence: 99%

Vibration control of a flexible structure with electromagnetic actuators

Gruzman

Santos

2015

J Braz. Soc. Mech. Sci. Eng.

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“…Song et al 4 used multi-peak fitting method to obtain a structural model for a 3D car shaped cavity. Abreu et al 25 used Eigen system Realization Algorithm and Observer/Kalman filter Identification (ERA-OKID) technique to identify the discrete state space model of a beam by using the experimental FRF data. Fang et al 26 measured the transfer functions from piezoelectric actuator to microphone and from speaker to microphone to build a state space model of the system.…”

Section: Introductionmentioning

confidence: 99%

Active structural-acoustic control of interior noise in a vibro-acoustic cavity incorporating system identification

Bagha

Modak

2017

Journal of Low Frequency Noise, Vibration and Active Control

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Linear quadratic Gaussian optimal control is one of the techniques used for active noise control. In practical implementation of this technique, one of the key difficulties faced is the estimation of the states of the plant. A state observer that accurately estimates these states can be used in this regard. Studies reported make use of analytically or experimentally derived models to build observers. This paper proposes a method for active noise control in the framework of active structural-acoustic control incorporating system identification for the development of the linear quadratic Gaussian controller. Kalman filter is used as a stochastic state observer of the plant states. System identification is carried out using modal testing and finite element model updating to obtain an accurate model of the plant for building up the Kalman filter. The objective of the proposed method is to actively reduce the noise inside the cavity due to disturbances acting on the cavity structure. The active control is achieved by controlling the structural vibrations by taking into account the degree of coupling between the various structural and the acoustic modes. The effectiveness of the proposed method is evaluated experimentally on a 3D rectangular box cavity with a flexible plate.

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“…Among those time domain methods, Bu et al [8] presented an experimental model of a flexible beam system incorporated with piezoceramic actuators based on the ARMAX (auto-regressive moving average exogenous) model. Abreu et al [9] derived a time-domain state space model of a flexible structure using the observer/kalman filter identification method together with an eigensystem realization algorithm. Tavakolpour et al [10] employed the genetic algorithm (GA) to identify the model parameters of a linear difference equation for a rectangular flexible plate system.…”

Section: Introductionmentioning

confidence: 99%

Experimental Identification and Vibration Control of A Non-Collocated Piezoelectric Flexible Manipulator Using Optimal Multi-Poles Placement Control

Lou

Liao

Yang

et al. 2017

Preprint

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This paper presents experimental identification and vibration suppression of a flexible manipulator with non-collocated piezoelectric actuators and strain sensors using optimal multipoles placement control. To precisely identify the system model, a reduced order transfer function with relocated zeros is proposed, and a first-order inertia element is added to the model to compensate the non-collocation. Comparisons show the identified model match closely with the experimental results both in the time and frequency domains, and a fit of 97.2% is achieved. Based on the identified model, a full-state multi-poles placement controller is designed, and the optimal locations of the closed loop poles are determined. The feasibility of the proposed controller is validated by simulations. Moreover, the controller is tested for different locations of the closed loop poles, and an excellent performance of the optimal locations of the closed loop poles is shown. Finally, the effectiveness of the proposed controller is demonstrated by experiments. Results show that the vibrations of the expected modes are significantly diminished. Besides, vibrations of the higher modes are also slightly suppressed. Accordingly, multi-mode vibrations of the manipulator are well attenuated, and the tip displacement converges quickly with the proposed method.

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System identification and active vibration control of a flexible structure

Cited by 18 publications

References 14 publications

Vibration control of a flexible structure with electromagnetic actuators

Vibration control of a flexible structure with electromagnetic actuators

Active structural-acoustic control of interior noise in a vibro-acoustic cavity incorporating system identification

Experimental Identification and Vibration Control of A Non-Collocated Piezoelectric Flexible Manipulator Using Optimal Multi-Poles Placement Control

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