Scopri come la simulazione multifisica viene utilizzata per ricerca e sviluppo
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.
Visualizza gli articoli presentati alla COMSOL Conference 2020
传统声表面波(SAW)滤波器技术存在Q值低(<1000)和频率随工作温度漂移的特性,已经难以满足频段越来越拥挤的5G时代射频终端对滤波器的要求,因此,传统的SAW滤波器必须向具备高频率-温度稳定性的温度补偿型SAW(TC-SAW)滤波器发展。鉴于SiO2层与压电层具有相反温度弹性的特性,且该工艺比另一种键合温补方法简单、成本低,是目前国内外声表厂家广泛采用的一种温补方式。 对该种TC-SAW谐振器进行COMSOL建模仿真,研究SiO2层、指条层厚度对SAW波导的影响,以及材料参数和结构尺寸与SAW滤波器频率温度系数(TCF)及机电耦合系数之间的关系 ... Per saperne di più
近年来,随着智能手机的普及和移动通讯技术的不断升级,对高频高性能SAW器件的需求也出现了激增之势。由于具有高的声速,包含金刚石的多层膜结构SAW器件成为了人们研究的热点。多层膜结构除了要具有高的相速度和大的机电耦合系数外,还需要IDT具有大的反射系数来设计低损耗和小尺寸的SAW器件 ,而电极厚度是影响反射系数的重要因素。本文利用COMSOL中的压电设备模块研究了ZnO/金刚石结构中Rayleigh波的m1和m2模式在最大机电耦合系数处的电极效应。仿真了ZnO/金刚石结构单端谐振器声表面波器件,计算了不同电极厚度下SAW的相速度、机电耦合系数和反射系数 ... Per saperne di più
随着电子通信的不断发展和普及,对声表面波器件(SAW)的性能要求也逐渐提升。在器件不断变小,工作环境的不断恶劣的情况下,声表面波器件也需要更高的频率、更好的稳定性能以及更大的带宽等新的提升。对于传统的氮化铝/金刚石结构来说已经无法满足更高频率,更大带宽的要求,所以本文为了能设计具有更高的相速度和机电耦合系数的声表面波器件,使用comsol 有限元仿真中的MEMS模块,对掺钪的氮化铝薄膜进行了研究,通过实验证明氮化铝钪作为压电材料时能具有更好的特性。通过研究在四种激励模式下氮化铝/金刚石结构与氮化铝钪/金刚石结构随着压电材料厚度的变化 ... Per saperne di più
沥青混凝土是一种典型的多相粘弹性材料,超声波在其中的传播规律非常复杂。不同温度下沥青混凝土的粘弹性差异非常明显,导致超声波的传播衰减比较显著。为确定合适的温度范围,基于COMSOL的固体力学模块,本文建立了超声波在沥青混凝土中的传播模型来探究振幅和波速对温度的敏感性。传播模型主要分为沥青混凝土和压电换能器两部分,其中,沥青混凝土部分采用蒙特卡洛方法构建二维三相沥青混凝土传播介质(集料、沥青砂浆和空隙);压电换能器部分则为一发一收式。基于Burgers模型,本文选取了四种典型温度 (-10℃、10℃、20℃和30℃) 下的沥青砂浆参数 ... Per saperne di più
超声波无损检测是一种相对成熟的技术,具有快捷、准确、高效等优势,广泛应用于医疗、制造、建筑等行业。在道路检测领域,由于沥青路面材料的复杂特性,特别是粘弹性,限制了超声波无损检测的大规模商用。同时,考虑到粘弹性介质对频率敏感度很高,入射频率的合适与否直接决定了超声波检测的效果。因此,本文以入射频率为变量,探究其对超声波在沥青路面中传播衰减的影响。 建立二维模型,主体分为沥青路面结构和压电换能器两部分,属于声学、电学与力学的多物理场耦合。沥青路面结构部分使用“固体力学”模块,根据实际情况,结构分为三层并分别定义材料参数,同时用Kelvin-Voigt模型表征其粘弹性 ... Per saperne di più
Introduction Leaky Surface Acoustic Wave (LSAW) resonators in rotated Y-X cut Lithium Tantalate (LiTaO3) are widely used for resonator based ladder filters in telecommunication applications. These devices make use of quasi- shear waves confined to the surface of the piezoelectric layer ... Per saperne di più
This simulation study analyzed ultrasonic power delivery by low-frequency (20-50 kHz) high-power ultrasonic actuation into fluid through a steel wall. The Acoustic-Piezoelectric Interaction, Frequency Domain interface of the COMSOL Acoustics Module were employed for this study. The ... Per saperne di più
Finite element analysis (FEA) can be used to study the electrical properties of conductive ITO thin films. Previous studies have been done on insulating thin films deposited on conductive substrates [1,2]. It was found that changes of electrode size and film thicknesses can cause huge ... Per saperne di più
Column Loudspeakers employ multiple drivers to get close to a radiating line source. A line source gives several acoustic advantages versus a point source, especially in highly reverberant environments. This property particularly has made column loudspeakers the preferred solution in ... Per saperne di più
The objective of the research is to design a broadband energy harvester device through the two-piece non-linear trapezoidal geometry approach. The performance of two piezoelectric PZT-PZN polycrystalline ceramic composition samples are simulated in the COMSOL Multiphysics® software, and ... Per saperne di più