Suppression of cross-track vibrations using a self-sensing micro-actuator in hard disk drives

Boettcher, Uwe; Matthes, Liane; Knigge, Bernhard; Callafon, Raymond A. de; Talke, Frank E.

doi:10.1007/s00542-012-1533-x

Cited by 7 publications

(3 citation statements)

References 24 publications

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“…The initial balance of the bridge-type circuitry is difficult, and the leakage resistance of piezoceramics will destroy the balance. Therefore, bridge-type circuitry is not suitable for static or low frequency situation, but mainly used in active vibration control (Gou and Li, 2011;Hong and Pang, 2012;Xie, 2013), vibration suppression (Boettcher et al, 2012;Hu et al, 2017a;Liu et al, 2015), system identification (Faegh et al, 2013), and fault diagnosis (Hu et al, 2017b). Piezoelectric capacitor/dielectric is particularly used to represent the position recently (Asghari et al, 2015), with a small signal of several hundred kHz added on the low-frequency driving voltage as the measuring signal (Ikeda and Morita, 2011;Seethaler, 2012a, 2012b).…”

Section: Introductionmentioning

confidence: 99%

Position and force self-sensing piezoelectric valve with hysteresis compensation

Zheng

Dong

2021

Journal of Intelligent Material Systems and Structures

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This paper presents an approach for self-sensing piezoelectric valves. Both displacement and actuation force of piezoelectric valve can be simultaneously estimated from measurements of the charge and driving voltage. Only simple calibration is required before engineering application. The charge is obtained by software integration of the piezoelectric current sampled by DAQ card, which has the advantage of compensating leakage current by pre-estimating the leakage resistance. A PID controller is used to track the displacement, and a feedfoward compensation using Prandtl–Ishlinskii model is taken to compensate the piezoelectric hysteresis. The experimental results show that the controller can track target displacement within 2.03% of error, track force within 1.80% of error, and the maximum hysteresis of actuator is compensated from 27% to 3.75%.

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Section: Introductionmentioning

confidence: 99%

Position and force self-sensing piezoelectric valve with hysteresis compensation

Zheng

Dong

2021

Journal of Intelligent Material Systems and Structures

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“…A proliferation of literature on self-sensing focuses on the applications of self-sensing technology, ranging from hard disk drive, atomic force microscopy, to micromanufacturing process (Boettcher et al, 2012; Kuiper and Schitter, 2010; Pang et al, 2006; Putra et al, 2008; Sasaki et al, 2012). Such studies employ self-sensing actuator in the controller design and have demonstrated the technical feasibility in a laboratory environment.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric indirect-driven self-sensing actuation and its application to piezoelectric systems

Pang

Wan

et al. 2020

Transactions of the Institute of Measurement and Control

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Self-sensing actuators use a single piezoelectric element as actuators and sensors simultaneously. This paper proposes the asymmetric indirect-driven self-sensing actuation (AIDSSA) circuit to realize the concept of self-sensing in piezoelectric-actuated systems. Unlike traditional circuits relying on differential amplifiers, the AIDSSA circuit is constructed with only op-amps and uses negative feedback to reject the common-mode interferences from the control command. The new circuit requires simpler conditions of component matching and is able to sense the mechanical responses with a uniform gain and without a phase lag. The actuator is able to achieve full-stroke actuation while sensing is performed, because AIDSSA introduces no undesirable dynamics into the control loop. For the first time, the sensing and actuation transfer functions in self-sensing actuators have become fully decoupled at all frequencies. The investigation takes the form of an industrial application of hard disk drives, and demonstrates the usefulness the circuit in complex positioning systems. Experimental results show that the position error variance, a measure of disturbance rejection capability, has been improved by about 15% in the track-following mode relative to the same servo before modifications.

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“…Barney et al [21] used PZT stack SSA based on a capacitance bridge circuit to control the vibration of a boring bar. Boettcher et al [22] used a capacitance bridge circuit to extract the displacement signal from the micro piezoelectric actuator of a hard disk drive (HDD), and the H ∞ control method was used to reduce vibration. Hong et al [23] added capacitances and resistances on the basis of a capacitance bridge to get a higher bandwidth and better noise-signal ratio, and used it to control the vibration of piezoelectrically-actuated flexible structures in mechatronic systems.…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric self-sensing actuator for active vibration control of motorized spindle based on adaptive signal separation

Chen

et al. 2018

Smart Mater. Struct.

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The motorized spindle is the core component of CNC machine tools, and the vibration of it reduces the machining precision and service life of the machine tools. Owing to the fast response, large output force, and displacement of the piezoelectric stack, it is often used as the actuator in the active vibration control of the spindle. A piezoelectric self-sensing actuator (SSA) can reduce the cost of the active vibration control system and simplify the structure by eliminating the use of a sensor, because a SSA can have both actuating and sensing functions at the same time. The signal separation method of a SSA based on a bridge circuit is widely applied because of its simple principle and easy implementation. However, it is difficult to maintain dynamic balance of the circuit. Prior research has used adaptive algorithm to balance of the bridge circuit on the flexible beam dynamically, but those algorithms need no correlation between sensing and control voltage, which limit the applications of SSA in the vibration control of the rotor-bearing system. Here, the electromechanical coupling model of the piezoelectric stack is established, followed by establishment of the dynamic model of the spindle system. Next, a new adaptive signal separation method based on the bridge circuit is proposed, which can separate relative small sensing voltage from related mixed voltage adaptively. The experimental results show that when the self-sensing signal obtained from the proposed method is used as a displacement signal, the vibration of the motorized spindle can be suppressed effectively through a linear quadratic Gaussian (LQG) algorithm.

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Suppression of cross-track vibrations using a self-sensing micro-actuator in hard disk drives

Cited by 7 publications

References 24 publications

Position and force self-sensing piezoelectric valve with hysteresis compensation

Position and force self-sensing piezoelectric valve with hysteresis compensation

Asymmetric indirect-driven self-sensing actuation and its application to piezoelectric systems

Piezoelectric self-sensing actuator for active vibration control of motorized spindle based on adaptive signal separation

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