The effects of bonding layer on the high-frequency dynamic response of piezoelectric augmented structures

2017 ◽  
Author(s):  
Mohammad I. Albakri ◽  
Pablo A. Tarazaga
Keyword(s):  
Dynamic Response ◽  
High Frequency ◽  
Bonding Layer

Dynamic analysis of a piezoelectric augmented beam system with adhesive bonding layer effects

2016 ◽  
Vol 28 (2) ◽  
pp. 178-194 ◽  
Author(s):  
Mohammad I. Albakri ◽  
Pablo A. Tarazaga
Keyword(s):  
Dynamic Response ◽  
High Frequency ◽  
Adhesive Bonding ◽  
Spectral Element ◽  
Bonding Layer ◽  
Inertia Effects ◽  
Electromechanical Impedance ◽  
Beam System ◽  
Host Structure ◽  
Piezoelectric Wafers

Embedded and surface bonded piezoelectric wafers have been widely used for control and monitoring purposes. Several nondestructive evaluation and structural health monitoring techniques, such as electromechanical impedance and wave propagation–based techniques, utilize piezoelectric wafers in either active or passive manner to interrogate the host structure. The basis of all these techniques is the energy transfer between the piezoelectric wafer and the host structure which takes place through an adhesive bonding layer. In this article, the high-frequency dynamic response of a coupled piezoelectric-beam system is modeled including the adhesive bonding layer in between. A new three-layer spectral element is developed for this purpose. The formulation of this new element takes into account axial and shear deformations, in addition to rotary inertia effects in all three layers. The capabilities of the proposed model are demonstrated through several numerical examples, where the effects of bonding layer geometric and material characteristics on dispersion relations and damage detection capabilities are discussed. The results highlight the importance of accounting for the adhesive bonding layer in piezoelectric-structure interaction models, especially when the high-frequency dynamic response is of interest.

scholarly journals Two-Phase Resonant Converter to Drive High-Power LED Lamps

Electronics ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 53 ◽  
Author(s):  
Christian Brañas ◽  
Rosario Casanueva ◽  
Francisco J. Díaz ◽  
Francisco J. Azcondo
Keyword(s):  
Dynamic Response ◽  
High Power ◽  
High Frequency ◽  
Pulsed Current ◽  
Resonant Converter ◽  
Two Phase ◽  
Street Lighting ◽  
Spice Model ◽  
Flicker Effect ◽  
Output Filter

This paper presents the design and modeling of a two-phase resonant converter that drives a LED lamp with a high-frequency pulsed current free of instabilities and flicker effect, fulfilling the recommendations of the IEEE PAR 1789-2015, so that it enables visible light-based communication at a 10 kB/s bit rate. The dynamic study of the converter takes into consideration the effect of the reflected impedance of the output filter on the AC side. In order to evaluate the dynamic response of the converter, a Spice model is defined. A 120 W prototype intended for street lighting applications has been built to validate the analysis and modeling.

Lateral Vibration of Offshore Piles Considering Pile-Water Interaction

2019 ◽  
Vol 19 (12) ◽  
pp. 1950147 ◽  
Author(s):  
Peng Fu ◽  
Kanghe Xie
Keyword(s):  
Dynamic Response ◽  
High Frequency ◽  
Hydrodynamic Force ◽  
Hydrodynamic Pressure ◽  
Frequency Range ◽  
Water Interaction ◽  
Dynamic Impedance ◽  
Separation Of Variable ◽  
Soil Interface ◽  
Offshore Piles

The dynamic response of an offshore pile in saturated soil subjected to lateral harmonic loading is theoretically investigated by considering the dynamic pile-water interaction. The governing equation of water is solved based on the separation of variable method, and the analytical expression of the hydrodynamic force applied on the pile is then obtained. Based on the continuous conditions at the pile-soil interface and pile-water interface, the analytical solution of the dynamic impedance of the offshore pile is derived by using transfer matrix method. To verify this solution, the dynamic impedance obtained for a cylinder in water is compared with that of a partially embedded pile. Based on this solution, the effect of hydrodynamic pressure and other parameters on the dynamic response of offshore piles is investigated. The results show that the analytical model ignoring the hydrodynamic force applied on the pile misestimates the impedance of the pile in the high frequency range.

Jitter Transmission Analysis and Experimental Research for Frame Structure in the Median and High Frequency Regions

2012 ◽  
Vol 271-272 ◽  
pp. 981-985
Author(s):  
You Yi Wang ◽  
Yang Zhao ◽  
Wen Lai Ma
Keyword(s):  
Dynamic Response ◽  
Frequency Response ◽  
Dynamic Model ◽  
Experimental Research ◽  
High Frequency ◽  
Low Frequency ◽  
Frame Structure ◽  
Wave Method ◽  
Simulation Results ◽  
Theoretical Results

Frame structure is widely used in practical projects. For jitter of the frame structure excited by median and high frequency disturbances, firstly, the dynamic model of thin plate substructure is built by wave method, and then the dynamic model of frame structure is established by combining wave method and substructure technique. At last, the accurate dynamic response was obtained. The simulation of dynamic characteristic is made, and simulation results are compared with FEM results. On this basis, modal experiment and frequency response experiment is done to verify theoretical results. In comparison to FEM, the results by wave method are accurate in low frequency regions, and the results are more accurate in the median and high frequency regions. The experiment proves wave method is correct and effective for jitter transmission analysis of frame structure in the median and high frequency regions.

High-Frequency Dynamic Model of a Pre-Loaded Circular Dielectric Electro-Active Polymer Actuator

2013 ◽  
Author(s):  
Micah Hodgins ◽  
Gianluca Rizzello ◽  
Alex York ◽  
Stefan Seelecke
Keyword(s):  
Dynamic Response ◽  
Dynamic Model ◽  
High Frequency ◽  
Natural Frequencies ◽  
Mechanical Coupling ◽  
Polymer Actuator ◽  
Validation Tests ◽  
Future Work ◽  
Force Displacement ◽  
Good Agreement

In this work a high-frequency dynamic model of a pre-loaded circular DEAP actuator is developed and experimentally validated. The model is capable of predicting both the static and dynamic response of the actuator. The static response is modeled based on a free energy approach and consists of an Ogden term representing the elastic energy, and a electrical term representing the electrical-mechanical coupling [1]. The addition of viscoelastic elements (spring-dashpot configurations) enables the model to capture the dynamic response. The Ogden coefficients were first identified through a quasi-static force-displacement test of the actuator. A series of validation tests of the actuator at various pre-loads and voltage frequencies showed the model to be in good agreement with the experiments. The model is shown to accurately predict the actuators observed natural frequencies as the pre-deflection and the stiffness of the spring were changed. Future work will include additions to the model to account for relaxation and creep inherent in DEAP material.

Study on WC-Ni60 Complex Coating by High Frequency Induction Cladding

2011 ◽  
Vol 675-677 ◽  
pp. 1299-1302 ◽  
Author(s):  
Xin Wei ◽  
Gui Qin Wang ◽  
Yong Feng Chang ◽  
Chao Liu
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
High Frequency ◽  
Electron Probe ◽  
Bonding Layer ◽  
Alloy Composite ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metallurgical Bonding ◽  
High Frequency Induction

In this paper, WC-Ni60 alloy composite coating with different contents of WC particles was prepared on the 45steel substrate by high frequency induction cladding. The Composition and microstructure were characterized by X-ray diffraction (XRD) and electron probe X-ray microanalysis (EPMA), the abradability and hardness were tested by UMT-2 tribometer and HV-50A durometer, respectively. The results showed that the hardness and wear resistance of coating were enhanced with the increasing of WC content. WC-Ni60 coating obtained the best wear resistance with the content of 50% WC. The hardness of the coating got the highest when the content of WC was 60%, but wear resistance decreased. The WC-Ni60 coating was reinforced for various hard phases and the metallurgical bonding layer about 10μm was formed between coating and 45steel substrate.

Bernstein-Be´zier Harmonics and Their Application to Robot Trajectory Synthesis With Minimal Vibrational Excitation

1996 ◽  
Vol 118 (4) ◽  
pp. 509-514 ◽  
Author(s):  
Q. J. Ge ◽  
J. Rastegar
Keyword(s):  
Dynamic Response ◽  
High Frequency ◽  
High Speed ◽  
Inverse Dynamics ◽  
Robot Manipulator ◽  
Vibrational Excitation ◽  
Significant Source ◽  
Polynomial Curves ◽  
Robot Trajectory

For a given high-speed machinery, a significant source of the internally induced vibrational excitation is the presence of high frequency harmonics in the trajectories that the system is forced to follow. This paper presents a Bernstein-Be´zier form of harmonic trajectory patterns for synthesizing low-harmonic trajectories. Similar to Bernstein-Be´zier polynomial curves, Bernstein-Be´zier harmonic trajectories can be defined either explicitly using Bernstein-Be´zier basis harmonics or recursively using the harmonic deCasteljau algorithm. The second part of the paper demonstrates how a Bernstein-Be´zier trajectory can be combined with the inverse dynamics of a robot manipulator for synthesizing a joint trajectory that demands “minimal” dynamic response from its actuators. An example involving a planar 2R robot is also presented.

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