Finite Element Analysis of Temperature and Viscosity Effects on Resonances in Thin-Film Bulk Acoustic Wave Resonators - new
G. Rughoobur, M. DeMiguel-Ramos, L. García-Gancedo, M. Clement, J. Olivares, T. Mirea, W. I. Milne, E. Iborra, A. J. Flewitt
University of Cambridge, Cambridge, UK
Universidad Politécnica de Madrid, Madrid, Spain
The shear mode of film bulk acoustic resonators (FBARs) is preferred to the longitudinal mode owing to its lower acoustic losses in a liquid. However in addition to mass loading, the resonance is also affected by temperature and liquid viscosity. These two parameters can either be sensed or compensated using a layer of silicon dioxide, which has a unique temperature coefficient of elasticity. In ...
T. O. Bassani , T. Bassani , A. Andriguetto , F. Schneider ,
 Instituto Latino Americano de Pesquisa e Ensino Odontológico - ILAPEO, Curitiba, PR, Brasil
 Universidade Tecnológica Federal do Paraná – UTFPR, Curitiba, PR, Brasil
O presente estudo visou a avaliação, por meio do método dos elementos finitos, das tensões geradas em um arco ortodôntico chamado de Arco de Retração Dupla Chave, também conhecido como DKL. Para isso foram modeladas as geometrias do arco DKL, dos bráquets e das coroas dentais, no software COMSOL Multiphysics®. O modelo criado tem como objetivo a substituição dos métodos tradicionais de ...
R. C. Thiagarajan
ATOA Scientific Technologies Private Limited, Bangalore, India
Conductive Composites such as carbon fiber reinforced composites are increasingly used in safety critical aerospace applications. The catastrophic macro structural failure of composite structures initiates from a micro level failure event such as fiber breaks. The ability to detect damage early on can improve the safety level and reliability of composite structures. A multilevel self-sensing ...
Modeling and Experimental Verification of the Power Transfer and Thermal Characteristics of Piezoelectric Transformers Subjected to Combined Mechanical and Electrical Loading
S. Tuncdemir, W.M. Bradley
Solid State Ceramics, Williamsport, PA, USA
QorTek, Williamsport, PA, USA
A piezoelectric transformer allows purely mechanical transfer and scaling of electrical energy via simultaneous utilization of both the direct and converse piezoelectric effects. This mechanical energy transfer enables a wide range of functional differences from typical magnetic-based electrical power transformers. Comparing to their electromagnetic counterparts, piezoelectric transformers are ...
高阁 , 刘震宇 ,
In order to satisfy the requirements of modern range measuring technology, photoelectric theodolites gradually develop towards lightweight and minitype design. As a consequence, the mobile theodolite is becoming a hot spot recently. New requirements are raised for the theodolite base (Figure1), which is an essential part of photoelectric theodolites. Namely, the eigenfrequencies should be high ...
A Numerical Model for Transient Heat Conduction in Semi-Infinite Solids Irradiated by a Moving Heat Source
N. Bianco, O. Manca, S. Nardini, and S. Tamburrino
Dipartimento di Energetica, Termofluidodinamica applicata e Condizionamenti ambientali, Università degli Studi Federico II, Napoli, Italy
Dipartimento di Ingegneria Aerospaziale e Meccanica, Seconda Università degli Studi di Napoli, Aversa (CE), Italy
A numerical analysis on transient three-dimensional temperature distribution in a semi-infinite solid, irradiated by a moving Gaussian laser beam, is carried out numerically by means of the code COMSOL Multiphysics. The investigated workpiece is simply a solid. A laser source is considered moving with constant velocity along the motion direction. The convective heat transfer on the upper surface ...
V. Sista, and E. Bhattarchaya
Microelectronics and MEMS Lab
Department of Electrical Engineering
Indian Institute of technology Madras
A MEMS based Knudsen’s pressure gauge working in the range of 1e-5 mbar to 10 mbar is designed and simulated in COMSOL. The working principle is based on Knudsen’s forces that arise when two plates are held at different temperatures and their separation is comparable to the mean free path of the ambient gas molecules. The forces change the separation between the plates and capacitance between ...
A. Leggieri, F. Di Paolo, D. Passi
University of Rome "Tor Vergata" - Department of Electronic Engineering, Rome, Italy
This paper describes the Virtual Prototyping based on a COMSOL Multiphysics® simulation for a novel Microwave Fin Taper (FT) Spatial Power Combiner (SPC) Amplifier. The analyzed system is waveguide (WG) based, and uses FT Probes to convert the energy of a rectangular WG EM fundamental mode to a Microstrip Transmission Line TEM mode, in order to be amplified by a Solid State Power ...
A Numerical Study for Rubber Particles Collection Involved in New Thermoforming Composite Process Using COMSOL Multiphysics®
R. Carbone, V. Antonelli, A. Langella, and R. Marissen
Material and Production Engineering Department, Università degli Studi di Napoli Federico II, Napoli, Italy
Institute of Lightweight Structures, Technische Universität München, München, Germany
Design and Production of Composite Structure, Delft University of Technology, Delft, The Netherlands
This paper deal of the forming process applied to the thermoplastic composites. A new thermoforming process that uses rubber particles collection as flexible mould was presented and numerically modeled. A characterization of the rubber in particles form was previously performed to value the material parameters in the user-defined hyperelastic constitutive laws employed in the FEM (Finite Element ...
M.S. Yeoman, A. Cizinauskas, C. Lowry, G. Vincent, S. Collins, D. Simpson
Continuum Blue, Tredomen, Ystrad Mynach, United Kingdom
Corin Group, Cirencester, United Kingdom
Imoprhics, Manchester, United Kingdom
Bone resorption around hip stems, in particular periprosthetic bone loss, is a common observation post-operatively. A number of factors influence the amount of bone loss over time and the mechanical environment following total hip replacement (THR) is important. Conventional long stem prostheses have been shown to transfer loads distally, resulting in bone loss of the proximal femur. More ...