Articles techniques et présentations

移动电话产品向更薄的趋势发展，装入手机中的微型扬声器能使用到的音腔空间也就日趋减少。为了高效利用手机内部空间，手机音腔设计时往往导通扬声器位置周围的小空间作为其音腔，扩大音腔体积。与此带来的问题是，因手机内部空间限制，导通管或导通孔规格较小，产生了声谐振效果。谐振频率点往往位于重要的中频段，使声压级中频段曲线出现波谷，影响声学性能和听感效果。 本文说明了声谐振产生的原因，并通过电力声类比，用理论方法估算出声谐振频率点的大致范围。为了解决声谐振产生的问题，我们使用 COMSOL Multiphysics® 准确模拟出扬声器声腔的 SPL 曲线，通过 SPL ... En savoir plus

Marine Vibrators are a coherent type of sound source, which can be quieter and less harmful for marine habitants than traditional air-gun technology. Such source gives clearer, more precise and higher resolution imaging of the bottom properties due to the coherent signal and streamer ... En savoir plus

In this session, we will discuss and showcase a few examples of advanced acoustics applications. In this context, “advanced” means problems that cannot simply be modeled “out-of-the-box,” but require the flexibility and strengths of COMSOL Multiphysics® software. Topics include: • ... En savoir plus

In this paper, design and analysis of a novel MEMS capacitive microphone which uses corrugations and perforations in diaphragm is presented. The corrugation and perforation in diaphragm reduces the residual stress and increases the mechanical sensitivity of diaphragm. Instead of the ... En savoir plus

The silicon is mainly known under its single-crystal shape and polycrystalline. Since a few decades, a new type of morphology is developed: the porous silicon (p-Si). Meso-porous silicon (Mp-Si) is one of promising materials for future microelectronic chips multi-functionalization ... En savoir plus

Numerous sensors based on various sensing principles are used to measure pressures and temperatures in wellbores. Of all these sensors, piezoelectric quartz is the most preferred means of sensing pressure and temperature and is probably the only sensor to meet stringent downhole ... En savoir plus

We have simulated the ultrasound-induced acoustophoretic motion of microparticles suspended in an aqueous solution. The full first-order thermoviscous acoustics equations have been implented on a rectangular microfluidic 2D domain excited with an ultrasound field tuned to resonance near ... En savoir plus

This paper presents finite element method (FEM) simulation study of the generation of bulk acoustic waves (BAWs) and their effect on the performance of surface acoustic wave (SAW) devices, using COMSOL Multiphysics. A SAW delay line structure using YZ-cut lithium niobate substrate is ... En savoir plus

Fluid flow has the potential to provide significant mechanical energy input for electromagnetic energy harvesters. The effect of a bluff body, such as cylinder played a significant role in the creation of a Karman vortex profile in the fluid flow. We study the effect of the number and ... En savoir plus

In this project, we report a design of MEMS microphone that is based on the application of porous silicon in improving the sensitivity of bulk micro machined capacitive pressure sensors. The property of a low Young’s modulus of porous silicon and its dependence on porosity have been ... En savoir plus