Design and Properties of Piezoelectric Vibrator with Generating Function by FEM Analysis

Lim, Kee-Joe; Kang, Sun-Kyung; Lee, Jong-Sub

doi:10.1007/s10832-004-5137-4

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…So far, DC motors have mostly been used to provide such excitation. DC motors are operated at low voltage but consume high electric power relative to piezoelectric exciters, resulting from their magnet and coil 1 Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

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The dynamic modeling and design improvement of a piezoelectric exciter of a touch screen device for efficient tactile feedback

Park¹,

Kim

2011

Smart Mater. Struct.

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Piezoelectric exciters have been receiving greater attention recently as a vibration source for tactile feedback in devices with touch screens, such as a mobile phones, in place of DC motors due to lower energy consumption and smaller volume. Their insufficient excitation level, however, still remains a problem. In this paper, dynamic modeling and design improvement of a piezoelectric exciter are presented. The excitation performance is defined as the acceleration response at the center of a touch screen per electric power and to be maximized around 250 Hz where the index finger is most sensitive. The piezoelectric exciter consists of a z-shaped metal beam, a piezoelectric layer on the long horizontal segment and an adhesive layer between the short horizontal segment and the touch screen. Assuming that the piezoelectric exciter is attached onto a rigid ground due to its low mechanical impedance compared with that of the touch screen, the piezoelectric exciter is dynamically modeled by applying Hamilton's principle, where the adhesive layer is treated as a distributed stiffness. The touch screen is modeled approximately as a simply supported beam such that it may have the same fundamental natural frequency and bending stiffness as the screen based on measurements. The performance improvement is focused on the change of five geometric parameters of the piezoelectric exciter: length of the long horizontal segment, thickness of the piezoelectric layer, thickness of the elastic metal layer, width of the beams and tip mass. The procedure to improve the performance of the piezoelectric exciter via dynamic modeling is presented together with experimental results on a prototype. Effectiveness of the design modification and limitations in practice are further discussed as well.

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Section: Introductionmentioning

confidence: 99%

“…components [1]. A commercial DC motor placed on a circuit board in a mobile phone, for example, works at an input voltage of 3 V and generates an acceleration of 1.7 G with a power consumption of 160 mW [2].…”

Section: Introductionmentioning

confidence: 99%

The dynamic modeling and design improvement of a piezoelectric exciter of a touch screen device for efficient tactile feedback

Park¹,

Kim

2011

Smart Mater. Struct.

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“…Optimisation is also performed through FE for a single mode of vibration in [18] but without demonstration of a validation process. In [19] FE optimisation and validation of a bimorph actuator is based on frequency response of just a single mode. A FE model of an omnidirectional piezo-actuator is shown in [20] with 3D validation of a single mode despite simulation of multiple resonances.…”

Section: Introductionmentioning

confidence: 99%

Modal validation of a cantilever-plate bimorph actuator illustrating sensitivity to 3D characterisation

et al. 2009

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A dynamic finite element (FE) model of a small piezoelectric plate actuator with cantilever boundary conditions is validated experimentally using operating modes, as the scale of the device prevents conventional modal excitation. A general methodology is presented for assembly of 3D modal response of the plate surface from single-point laser vibrometer data, which is an economical alternative to the automated process provided by scanning vibrometers. 1D blocked force and 2D beam assumptions prove insufficient for validation due to modes both in the length and width of the device in operation. The model is validated in the audible frequency range encompassing 12 experimental operating modes. It is shown that when conducting validation using operating modes, the experimental results, simulated frequency response and FE eigenmodes must all be compared. Discrepancies between FE and experiment are identified and attributed to manufacturing imperfections above modelling errors.

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“…Bimorph benders are used as actuators in a variety of applications, ranging from Braille pads [1] to components in mobile phones [2] or tools for minimal invasive surgery [3]. In every application, but especially in high performance applications, both performance (i.e.…”

Section: Introductionmentioning

confidence: 99%

Non-linear electromechanical behaviour of piezoelectric bimorph actuators: Influence on performance and lifetime

Ende

Bos

Groen³

2008

J Electroceram

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Piezoelectric bimorph bender actuators find application number of areas, ranging from automotive to health care. High voltage operation in harsh environments poses ever more stringent demands on functionality and lifetime. In these high performance benders, the trade-off between functionality and lifetime becomes of increasing importance, and a model-based understanding is imperative for further tailoring actuator performance. An important issue in this is the non-linear electromechanical coupling and mechanical poling/depoling processes. PZT materials are known to exhibit non-linear stiffness when strained. This effect is attributed to domain re-orientation and can result in mechanical depoling. In bimorph benders where only one of the PZT members is actuated, the non-linear stiffness effect results in higher deflections than are predicted by linear elastic models. This effect is larger for soft PZT materials than for hard PZT materials. In this work, the non-linear behaviour of piezoelectric bimorphs was characterized by dynamic mechanical thermal analysis (DMTA). Unimorph benders were characterized in different configurations. Two different PZT materials (one soft, one hard) were used. The non-linear stiffness behaviour is included in a model for piezoelectric multimorphs. The multimorph model predictions are compared to measured deflection and blocking force of bimorph benders made from soft PZT material. The model incorporating non-linear stiffness predicts deflection and blocking force values more accurately than the linear model for the situation studied. Attention is paid to the stresses induced during poling of the bimorphs and their effect on performance and lifetime.

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Design and Properties of Piezoelectric Vibrator with Generating Function by FEM Analysis

Cited by 4 publications

References 5 publications

The dynamic modeling and design improvement of a piezoelectric exciter of a touch screen device for efficient tactile feedback

The dynamic modeling and design improvement of a piezoelectric exciter of a touch screen device for efficient tactile feedback

Modal validation of a cantilever-plate bimorph actuator illustrating sensitivity to 3D characterisation

Non-linear electromechanical behaviour of piezoelectric bimorph actuators: Influence on performance and lifetime

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