Prof. Jeng-Jong Ro Profile

Prof. Jeng-Jong Ro

Associate Professor at Dayeh Univ

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Author

Publications (16)

Proceedings Article | 28 February 2005 Paper

Active control of flexural vibration of a hollow cylindrical rod using MFC actuators

Jen-Jong Ro, Chin-Chie Chien, Teng-Yu Wei, Shuh-Jang Sun

Proceedings Volume 5649, (2005) https://doi.org/10.1117/12.582393

KEYWORDS: Actuators, Microsoft Foundation Class Library, Feedback control, Composites, Sensors, Signal attenuation, Vibration control, Finite element methods, Modal analysis, Structural dynamics

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Proceedings Article | 28 February 2005 Paper

The poling design of a shear mode piezoelectric actuator

C. H. Cheng, Jeng-Jong Ro, S. C. Chen, H. C. Kuo, T. H. Chang, P. C. Chang

Proceedings Volume 5649, (2005) https://doi.org/10.1117/12.582167

KEYWORDS: Actuators, Ferroelectric materials, Electromechanical design, Electrodes, Polarization, Dielectric polarization, Inkjet technology, Dielectric breakdown, Piezoelectric effects, Printing

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Proceedings Article | 14 November 2002 Paper

Finite-element analysis and performance evaluation of synthetic jet actuators

Jeng-Jong Ro, K. Wu

Proceedings Volume 4935, (2002) https://doi.org/10.1117/12.469417

KEYWORDS: Actuators, Finite element methods, Ferroelectric materials, Metals, Aerodynamics, Chemical elements, Aerospace engineering, Matrices, Acoustics, Control systems

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The primary objective of active flow control research is to develop a cost-effective technology that has the potential for revolutionary advances in aerodynamic performance and maneuvering compared to conventional approaches. The development of such systems have many implications for aerospace vehicles including: reducing mechanical complexity and hydraulic failure, reducing noise and weight, lowering energy and fuel consumption, lowering downtime and maintenance, enhancing maneuvering and agility with enhanced aerodynamic performance and safety. Interest in active flow control for aerospace applications has stimulated the recent development of innovative actuator designs that create localized disturbances in a flowfield. A novel class of devices, known as synthetic jet actuator, has been demonstrated to exhibit promising flow control capabilities including separation control and thrust vectoring. The basic components of a synthetic jet actuator are made of cavity and oscillating materials. The synthetic jet actuator developed at NASA LaRC has a small housing in which a cylindrical cavity is enclosed by two metal diaphragms, 50 mm in diameter, placed opposite each other. A circular piezoelectric wafer is attached to the center of the outside face of each metal diaphragm. The pair of piezoelectric metal diaphragms is operated with a 180° phase differential at the same sinusoidal voltage and frequency. With actuation, a synthetic jet issues from a 35.5mm long by 0.5mm wide slot on the top of the device. In this study, a finite element model of synthetic jet actuator developed at NASA LaRC is investigated. The developed finite element model can be utilized to design and determine the performance of synthetic jet actuator. The analysis includes the FE model of circular plate, FE model of piezoelectric actuator/circular plate, piezoelectric (electrical field)/circular plate (structural field)/cavity (flow field) coupled system and experimental validation. The phase-average jet center velocity and amplitude of input voltage of piezoelectric actuator are predicted by this finite element model. The theoretical prediction is validated experimentally in this study.

Proceedings Article | 21 August 2001 Paper

Finite element modeling of MFC/AFC actuators

M. Salim Azzouz, Jeffrey Bevan, Jeng-Jong Ro, Chuh Mei

Proceedings Volume 4326, (2001) https://doi.org/10.1117/12.436491

KEYWORDS: Actuators, Ferroelectric materials, Composites, Chemical elements, Finite element methods, Microsoft Foundation Class Library, Transducers, Matrices, Electrodes, Acoustics

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Proceedings Article | 12 June 2000 Paper

Analysis and control of large thermal deflection of composite plates using shape memory alloy

Bin Duan, Mohammad Tawfik, Sylvain Goek, Jeng-Jong Ro, Chuh Mei

Proceedings Volume 3991, (2000) https://doi.org/10.1117/12.388178

KEYWORDS: Shape memory alloys, Composites, Temperature metrology, Matrices, Finite element methods, Skin, Atrial fibrillation, Aerodynamics, Aluminum, Krypton

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Proceedings Article | 12 June 2000 Paper

Vibration of laminated composite plates embedded with shape memory alloy at elevated temperatures

Bin Duan, Mohammad Tawfik, Sylvain Goek, Jeng-Jong Ro, Chuh Mei

Proceedings Volume 3991, (2000) https://doi.org/10.1117/12.388179

KEYWORDS: Shape memory alloys, Composites, Chemical elements, Temperature metrology, Matrices, Thermal effects, Vibrometry, Vibration control, Krypton, Skin

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Proceedings Article | 12 June 2000 Paper

Suppression of postbuckling deflection and panel flutter using shape memory alloy

Mohammad Tawfik, Bin Duan, Jeng-Jong Ro, Chuh Mei

Proceedings Volume 3991, (2000) https://doi.org/10.1117/12.388177

KEYWORDS: Shape memory alloys, Aerodynamics, Chlorine, Finite element methods, Temperature metrology, Composites, Aerospace engineering, Skin, Cobalt, Seaborgium

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Proceedings Article | 27 April 2000 Paper

Control of sound radiation from an active constrained-layer damping treated plate into an acoustic cavity using structural intensity approach

M. Salim Azzouz, Jeng-Jong Ro

Proceedings Volume 3989, (2000) https://doi.org/10.1117/12.384577

KEYWORDS: Acoustics, Finite element methods, Control systems, Matrices, Smart materials, Sensors, Actuators, Chemical elements, Vibration control, Reliability

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Proceedings Article | 2 June 1999 Paper

Vibration control of plates using self-sensing active constrained layer damping

Jeng-Jong Ro, Amr Baz

Proceedings Volume 3672, (1999) https://doi.org/10.1117/12.349783

KEYWORDS: Control systems, Actuators, Ferroelectric polymers, Sensors, Vibration control, Bridges, Signal attenuation, Feedback control, Finite element methods, Aluminum

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Proceedings Article | 27 July 1998 Paper

Optimum placement and control of active constrained layer damping using the modal strain energy approach

Jeng-Jong Ro, Amr Baz

Proceedings Volume 3329, (1998) https://doi.org/10.1117/12.316955

KEYWORDS: Finite element methods, Signal attenuation, Chemical elements, Lithium, Reliability, Actuators, Matrices, Silicon, Aerospace engineering, Mechanical engineering

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Proceedings Article | 13 June 1997 Paper

Control of sound radiation from a plate into an acoustic cavity using active piezoelectric-damping composites

Wilfred Shields, Jeng-Jong Ro, Amr Baz

Proceedings Volume 3039, (1997) https://doi.org/10.1117/12.276596

KEYWORDS: Acoustics, Composites, Finite element methods, Signal attenuation, Matrices, Feedback signals, Polymers, Control systems, Polyurethane, Ferroelectric materials

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Sound radiation from a plate into an acoustic cavity is controlled using patches of active piezoelectric-damping composites (APDC). The APDC, under consideration, consists of piezoelectric fibers embedded across the thickness of a visco-elastic matrix in order to control the compressional damping characteristics of the composite. The effectiveness of the APDC treatments in attenuating the sound radiation from thin plates into cavities is demonstrated theoretically and experimentally. A finite element model (FEM) is developed to describe the dynamic interaction between the plate, the APDC patches and the acoustic cavity. The FEM is used to predict the dynamics of the plate/acoustic cavity and the sound pressure distribution for different control strategies. The predictions of the FEM are validated experimentally using a square aluminum plate whose sides are 29.8 cm and thickness of 0.04 cm. The plate is mounted on a 29.8 cm $ MUL 29.8 cm X 75 cm cavity. The test plate is treated with a single APDC patch placed at the plate center. The patch is 5 cm X 5 cm X 0.03125 cm which is made of 15-25 percent lead zirconate titanate fibers embedded in soft and hard polymeric resin matrices and provided with silver-epoxy electrodes. Vibration and sound pressure level attenuations of about 70 percent are obtained a the plate/cavity first mode of vibration, with a maximum control voltage of 330 volts using a derivative feedback controller. Such attenuations are attributed to the effectiveness of the APDC treatment in increasing the modal damping ratios by about a factor of four over those of conventional passive constrained layer damping treatments. Comparisons between the theoretical predictions of the FEM with the experimental results indicate close agreement between theory and experiments. The obtained results suggest the potential of the APDC treatments in controlling the sound radiation from plates into acoustic cavities. Such potential can be exploited in many critical applications such as cabins of aircrafts and automobiles to ensure quiet environment for the occupants.

Proceedings Article | 31 May 1996 Paper

Control of sound radiation from a NITINOL-reinforced plate into an acoustic cavity

Jeng-Jong Ro, Amr Baz

Proceedings Volume 2715, (1996) https://doi.org/10.1117/12.240801

KEYWORDS: Acoustics, Finite element methods, Shape memory alloys, Composites, Signal attenuation, Chemical elements, Matrices, Actuators, Numerical analysis, Tellurium

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Proceedings Article | 5 May 1995 Paper

Vibration control of plates with active constrained-layer damping

Amr Baz, Jeng-Jong Ro

Proceedings Volume 2445, (1995) https://doi.org/10.1117/12.208908

KEYWORDS: Sensors, Matrices, Actuators, Finite element methods, Vibration control, Control systems, Amplifiers, Signal attenuation, Aluminum, Ferroelectric polymers

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Proceedings Article | 6 May 1994 Paper

Shape control of NITINOL-reinforced composite beams

Amr Baz, Tung-Huei Chen, Jeng-Jong Ro

Proceedings Volume 2190, (1994) https://doi.org/10.1117/12.175205

KEYWORDS: Composites, Beam shaping, Thermal modeling, Mathematical modeling, Beam controllers, Chemical elements, Finite element methods, Tantalum, Iron, Thermal effects

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Proceedings Article | 1 May 1994 Paper

Performance characteristics of active constrained-layer damping

Amr Baz, Jeng-Jong Ro

Proceedings Volume 2193, (1994) https://doi.org/10.1117/12.174089

KEYWORDS: Sensors, Control systems, Signal attenuation, Beam shaping, Ferroelectric polymers, Actuators, Finite element methods, Performance modeling, Amplifiers, Composites

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Proceedings Article | 8 September 1993 Paper

Active deflection control of multisegment traversing beams

Amr Baz, Jeng-Jong Ro

Proceedings Volume 1917, (1993) https://doi.org/10.1117/12.152756

KEYWORDS: Actuators, Intelligence systems, Smart structures, Sensors, Bridges, Calcium, Control systems, Beam shaping, Beam controllers, Composites

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Showing 5 of 16 publications

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