Articles techniques et présentations

A Piezoelectric Directional Microphone is demonstrated based on a bio-mimetic design inspired by the parasitoid fly Ormia ochracea using the PiezoMUMPs multi-user foundry. The device simulation was conducted using COMSOL Multiphysics® software which achieves a directional sound field ... En savoir plus

Experiments have been conducted with water at velocities from ~0.015-0.77 m/s to determine the permeability of 50 mm thick commercially available 30, 40, 50 and 80 Pores Per Inch (PPI) Ceramic Foam Filters (CFF) used for liquid metal filtration. Measurements were made using two different ... En savoir plus

A standalone interface for web-based virtual reality and the underlying visualization system are presented. The developed user-friendly web application is implemented based on nowadays web techniques. Details for data handling and rendering are given to visualize COMSOL Multiphysics® ... En savoir plus

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

Surface acoustic wave (SAW) devices are widely used for their sensing capabilities and gas sensing is only one of many uses. There is an ever increasing need to make them as effective as possible by adding nanomaterials to the device. In this study a two-port delay-line structure with ... En savoir plus

The aim of this work is to present a model capable to describe the behaviour of a thermal flow sensor under every physical aspect. A generic thermal flow sensor relates the flow properties with a variation in the temperature profile inside the device itself. Thus, it is locally heated ... En savoir plus

Microchannel has shown potential to dissipate high heat flux in past years [1][2]. At the same time, liquid cooling attracts more and more attention from researchers for its favorable thermal properties and ability to cool down hot and keep acceptable system temperature [3][4][5]. This ... En savoir plus

Steel tubes are widely used in industries. In order to ensure the safety and reliability of industrial processes, electromagnetic acoustic transducers (EMATs) based guided wave technology has been developed for inspecting stainless steel tubes regularly. Theoretical models and finite ... 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