Articles techniques et présentations

This communication describes a model created to investigate the effect of mold-metal contact on casting solidification in the continuous casting process. The Heat Transfer and Solid Mechanics modules of COMSOL Multiphysics® simulation software are used to construct a non-linear finite ... En savoir plus

Here we optimize the geometry: proof mass length Lm to total length L, thickness of the piezoelectric material (Tp) to total cantilever thickness (T) for obtaining the maximum stress distribution (Smax), output voltage (Vout) and power performance (Pout) of the unimorph Cantilever beam ... En savoir plus

The expression <em>adaptive optics</em> was initially termed for the technology used in the telescopes to deform the mirrors to allow for phase correction of the incoming light. Soon, the adaptive optics was also implemented in microscopes, optical communication systems and ... En savoir plus

Ultrasonic flow-cell reactors are used for many industrial applications, where fluid substrate is sonicated in a small region, where very high ultrasonic acoustic power is present. The electromechanical transducer (converter) that drive the sonotrode inside the flow-cell is designed in ... En savoir plus

One way to extract piezoelectric material data from measurements is to utilize vibrational eigenmodes of block-shaped test specimens (Rupitsch 2015). Within a simulation-aided approach this results in optimizing the values of the material data parameters to fit the experimental result, ... En savoir plus

Bimetallic mechanical parts made of steel and bronze combine in an optimal manner the mechanical properties of the steel and the excellent anti-friction characteristics of the bronze. These properties make applications possible in various high-tech domains such as aviation, energy and ... En savoir plus

泄洪闸室结构具备挡水和泄水两重主要功能的水工建筑物，工作中因水位变幅较大，加之泄流振动的水流动水压力不断突变，尤其水工闸门的启闭过程所形成的缝隙流对闸室结构产生严重危害。为此，以大藤峡深孔泄洪闸室为研究对象，研究其结构应力应变特征。首先对COMSOL流固耦合有限元与PSO-BP神经网络两种方法进行重构形成研究方法，针对大流量泄洪闸室泄流振动条件的结构应力应变研究重构后的方法可以发挥两种方法的优势；然后以COMSOL开展闸室泄流水体与闸室结构的流固耦合有限元模拟，获得泄流激励条件下坝身振动特征与应力变形规律；随后构建PSO-BP神经网络分析模型，分别开展了创建网络结构 ... En savoir plus

Piezoelectric micromachined ultrasound transducers (PMUTs) are gaining increasing interest as miniaturized, low-power devices which can be easily integrated with electronic systems for applications such as medical imaging, therapeutic ultrasound, and particle manipulation. This work ... En savoir plus

Invented at the end of the XIXth century, the electrodynamic loudspeaker has not much changed since then. Although the materials have greatly evolved, the geometry and the transduction principle have remained the same. However, in many applications, the bulkiness of the driver behind the ... En savoir plus

Beams-driven structures are structures that use beams to support their weight. The beams are typically arranged in a way that distributes the weight of the structure evenly. Beams-driven structures are often used in buildings, bridges, and other complicated structures. Beams-driven ... En savoir plus