Vibration control of structures with self-sensing piezoelectric actuators incorporating adaptive mechanisms

Law, Wai Wing; Liao, Wei-Hsin; Huang, Jen-Kuang

doi:10.1088/0964-1726/12/5/008

Cited by 45 publications

(33 citation statements)

References 14 publications

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“…For this purpose, we consider the finite dimensional closed loop system with the states z, x ij , x e ,x ij ,x e , ξ comprising system (9) with k·l modes, the Kalman filter K (11) and the internal model (12) with the stabilizer (13). The closed loop, hence, consists of the exosystemż = Sz, the closed loop plant dynamicṡ…”

Section: Suppression Of Harmonic Vibrations With Known Frequencymentioning

confidence: 99%

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Compensation of harmonic disturbances in piezoelastic structures

Rittenschober

2011

Mathematical and Computer Modelling of Dynamical Systems

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The use of self-sensing piezoelectric actuators in smart structures means collocation of actuator and sensor. The measured electric current carries contributions from an electrical and mechanical subsystem. The latter contribution is due to the direct piezoelectric effect that is used for the purpose of vibration control. This procedure requires the robust separation of the electric current due to the direct piezoelectric effect from the measured electric current. Due to the unfavourable ratio of these two signals, the design of an observer for the electric current due to the direct piezoelectric effect is proposed. The control design for the purpose of harmonic disturbance suppression is based on an internal model approach and is facilitated by the special structure of the underlying mathematical model. Stability issues with respect to the distributed parameter system are resolved by applying the concepts of passivity and L 2 stability in conjunction with the small gain theorem. The control concept is evaluated by exciting the piezoelastic structure under investigation at a dominant eigenfrequency.

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Section: Suppression Of Harmonic Vibrations With Known Frequencymentioning

confidence: 99%

“…An observer-based SSA approach bypasses the impedance mismatching problem in bridge-based SSAs and experimental results are outlined in [12]. The problem of varying capacitance of the piezoelectric element is addressed in [13] where an adaptive compensation in combination with the SSA technique is proposed.…”

Section: Introductionmentioning

confidence: 99%

Compensation of harmonic disturbances in piezoelastic structures

Rittenschober

2011

Mathematical and Computer Modelling of Dynamical Systems

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“…In order to achieve high performance for the SSA system under the condition of uncertain piezoelectric capacitance, an adaptive scheme is proposed to compensate the uncertainty while simultaneously suppressing the structural vibration (Law et al 2003). Consider the circuit shown in Fig.…”

Section: Online Adaptationmentioning

confidence: 99%

“…However, it has been pointed out by Law et al (2003) that because the SSA configuration inherently contains a feedforward dynamics, the success of SSA relies on the compensation of this feedforward dynamics such that only the signal induced from the structural deformation is used for generating the control input. And the feedforward dynamics depends on the equivalent capacitance of the piezoelectric materials.…”

Section: Introductionmentioning

confidence: 99%

Self-sensing actuators with passive damping for adaptive vibration control of hard disk drives

Chan

Liao

2008

Microsyst Technol

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A push-pull piezoelectrically actuated devices have been developed for higher bandwidth servo systems as microactuators for fine and fast positioning, while the voice coil motor functions as a large but coarse seeking. However, the current dual-stage actuator design uses piezoelectric patches only and therefore a dual-stage servo system using enhanced active-passive hybrid micro piezoelectric actuators is proposed to improve the existing dual-stage actuators for higher precision and shock resistance, due to the incorporation of passive damping in the design. In this paper, three different configurations of self-sensing actuators (SSAs) incorporating an adaptive mechanism for vibration control of suspensions in dual-stage hard disk drives (HDDs) are investigated. In the piezo-based SSA configuration, the signal sensed due to mechanical deformation is mixed with the control input signal, which would be corrupted due to the variation of the piezoelectric capacitance when a fixed bridge circuit is used. In this study, a self-tuning adaptive compensation is used to combine with the SSA technique to extract the true sensing signal for the vibration control of suspensions in HDDs. An assembled suspension with piezoelectric microactuators is tested to demonstrate the vibration suppression performance of this adaptive structure under an external shock disturbance such as hammer excitation. The experimental results show that the target vibration modes have been suppressed effectively with using the adaptive positive position feedback controller for the enhanced SSAs with passive damping in HDDs.

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“…However, because of the uncertainty of the piezoelectric equivalent capacitance, the self-sensing bridge is often out of balance. To solve the problem, electromechanical balancing [2], real-time piezoelectric permittivity measurements using the adaptive mechanism [3], and an adaptive on-line compensation of piezoelectric capacitance variation [4] were proposed. Yoonsu et al pointed out that an adaptive filter for the strain rate estimation did not work properly due to the phase delay effect in piezoelectric material [5].…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric Self-Sensing Actuator for Beam Vibration Control Based on Blind Source Separation

Dong

Ding

et al. 2007

Ferroelectrics

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A blind source separation based vibration control method using piezoelectric selfsensing actuator is proposed. Two piezoelectric ceramic patches acting as actuators and two current amplifiers consist of the self-sensing bridge circuit. Each piezoelectric current is a mixture of strain rate current and capacitor current. As they are orthogonal and independent with each other, the blind source separation technique is introduced to obtain the pure strain rate signal. An effort is made to solve the problem of BSS uncertainty in separation order. Open loop experimental results on cantilever beam show the feasibility and validity of the proposed method.

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Vibration control of structures with self-sensing piezoelectric actuators incorporating adaptive mechanisms

Cited by 45 publications

References 14 publications

Compensation of harmonic disturbances in piezoelastic structures

Compensation of harmonic disturbances in piezoelastic structures

Self-sensing actuators with passive damping for adaptive vibration control of hard disk drives

Piezoelectric Self-Sensing Actuator for Beam Vibration Control Based on Blind Source Separation

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