In questa sezione troverete i lavori presentati alle Conferenze mondiali COMSOL. Le presentazioni descrivono ricerche e prodotti innovativi progettati con COMSOL Multiphysics da colleghi di tutto il mondo. I temi delle ricerche presentate abbracciano un'ampia gamma di settori produttivi e aree applicative, in ambito elettrico, meccanico, fluidodinamico e chimico. Lo strumento di Ricerca Rapida vi permetterà di trovare le presentazioni che si riferiscono all'area di vostro interesse.

Nondestructive Testing of Composites Using Model Based Design

E. Nesvijski[1]

There is a practical interest among composite materials manufacturers to high-speed accurate non-destructive evaluation (NDE) technology for voids inspection when these voids are natural components of such complex structures like resin insulated layer of double-sided copper-clad laminates. Model based design (MBD) of NDE system is one of principal solutions for voids inspection in such ...

Solving the Inverse Problem of Resonant Ultrasound Spectroscopy on Dumbbell-shaped Compression Samples Using COMSOL Multiphysics®

M. C. Golt[1]
[1]U.S. Army Research Laboratory*, Aberdeen Proving Ground, MD, USA
*Contracted through Dynamic Science, Inc.

The dumbbell geometry is an ideal shape for testing the compressive strength of advanced ceramic materials. This paper details the combined use of COMSOL Multiphysics® and LiveLink™ for MATLAB® for determining the elastic properties of dumbbell-shaped samples by measuring their acoustic resonance frequencies. Degenerate bending modes which are sensitive to inhomogeneities or machining defects ...

Piezoelectric Buzzer Optimization for Micropumps

A. Garcia[1], A. Marcus[1], F. Tejo[1], C. Precker[1], C. Moreira[2]
[1]Universidade Federal de Campina Grande, Campina Grande, PB, Brazil
[2]Instituto Federal de Alagoas, Maceio, AL, Brazil

Piezoelectric buzzers are low cost devices which can be used successfully as actuators in diaphragm-based micro-pumps. The buzzers are piezoelectric wafers (lead-zirconate-titanate-PZT) that are glued on a brass membrane and they are available within different sizes and thicknesses. For the best performance of a diaphragm pump, it is necessary to have a large displacement of the membrane. This ...

Piezoelectric Surface Acoustic Wave (SAW) Device with Simulated Poling Condition

R. Xu [1], M. Guizzetti [1], K. Astafiev [1], E. Ringgaard [1], T. Zawada [1],
[1] Meggitt A/S, Kvistgaard, Denmark

FEM (Finite Element Method) modelling software such as COMSOL Multiphysics® can be a powerful tool for modelling the behavior and response of piezoelectric materials and devices [1]. Devices based on piezoelectric crystals are particularly well suited, because the polarization magnitude in crystals is predetermined and its orientation is defined by how it was cut with respect to the lattice ...


陆晓 [1], 温周斌 [1], 徐楚林 [1], 岳磊 [1],
[1] 浙江中科电声研发中心,嘉善,中国

扬声器仿真分析方法越来越受到电声企业关注,已成为扬声器设计的重要手段和发展方向。要想设计中高端扬声器,就必须建立一套完整的仿真分析方法。 本文介绍一种基于 COMSOL Multiphysics® 的用于中高端扬声器设计的仿真分析方法。该方法不仅包含了扬声器磁路、振动系统(结构)和声场的耦合分析,还模拟了温度对磁性材料和振动部件材料特性的影响。由于扬声器振动部件材料的粘弹性等特性,因此必须建立更为准确的材料模型。利用 COMSOL Multiphisics 软件丰富的第三方软件接口和二次开发功能,经数据后处理可得到声障板等条件下的声压级、谐波失真和互调失真等。 采用本方法可有效指导中高端扬声器的仿真设计,准确预估扬声器的声压级、谐波失真和温度场等关键指标,对扬声器产品的理解和设计水平亦将达到新的高度。

Optimization of an Acoustic Waveguide for Professional Audio Applications

M. Cobianchi[1] and R. Magalotti[1]
[1] B&C Speakers S.p.a., Bagno a Ripoli, FI, Italia

In modern live sound reinforcement there is a growing use of line sources, obtained through the stacking of many loudspeakers with properly controlled wavefront shape. Thus the use of waveguides is mandatory in order to modify the shape and size of the wavefront exiting from professional compression drivers. With the help of COMSOL Multiphysics®, we have designed a waveguide featuring an ...

Surface Acoustic Wave Scattering Matrix Evaluation Using COMSOL Multiphysics®: Application to Surface Acoustic Wave Transmission Through 2D Surface Phononic Crystal

S. Yankin[1,2], A. Talbi[1], V. Preobrazhensky[1,3], P. Pernod[1], O. Bou Matar[1], A. Pavlova[1]
[1] Joint International Laboratory LICS/LEMAC, IEMN UMR CNRS 8520, EC Lille, Villeneuve d'Ascq, France
[2] Saratov State University, Saratov, Russia
[3] Wave Research Center, Russian Academy of Sciences, Moscow, Russia

This contribution is dedicated to numerical analysis of SAW propagation though 2D surface phononic crystal (PnC) and FE method is nowadays one of most common tool for such calculation. The device under investigation consists of two dispersive IDT and lattice of ferromagnetic pillars realized on 128°YX LiNbO3. In addition to dispersion curves calculations this work describes the results of ...

Numerical Model of the Insertion Loss Promoted by the Enclosure of a Sound Source

G. F. Greco [1], I. K. S. Hermont [1], B. P. Murta [1], T. B. Romero [1], P. H. Mareze [1], A. Lenzi [2], J. A. Cordioli [2],
[1] Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
[2] Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil

This study aims to develop and validate a finite element numerical model to represent the Insertion Loss (IL) promoted by the enclosure of a sound source. For the validation, a enclosure prototype was built in wood and the IL was measured in laboratory. The idea is to develop an efficient numerical model that would be suitable for enclosure's design and optimization. The problem was modeled ...

Virtual Commissioning of Large Machines with COMSOL Multiphysics® Software

K. Kryniski [1], A. Trangard [1],
[1] ABB Corporate Research, Västerås, Sweden

In addition to using advanced functions built-into the engine of the COMSOL Multiphysics® software, we integrate dynamic properties of rotating components that are measured or pre-computed. Here, it is shown how to integrate fluid-film characteristics and take advantage of post-processing and graphics to present the results to the customers using the Cloud. COMSOL® simulations of rotor-bearing ...

Determination of the Sweet Spot of a Cricket Bat using COMSOL Multiphysics® Software

Y. Mulchand [1], A. Pooransingh [1], R. Latchman [1],
[1] The University of the West Indies, St. Augustine, Trinidad and Tobago

The aim of this paper is to determine the location of the “sweet spot” for a selected cricket bat commonly used in the sport. Knowledge of the “sweet spot” is important in delivering a shot that utilizes the optimal zone of the bat that corresponds to the maximum power of the stroke. A model of the cricket bat was constructed in the Structural Mechanics Module of COMSOL Multiphysics® Software ...