Technical Papers and Presentations

Wind turbine towers can often become modal if matched closely in frequency with the excitation associated with rotating components in the drive train, such as gearboxes and generators. When these conditions are met, the modal response is greatly amplified due to the very low structural ... Read More

The impedance tube is commonly used to characterize sound absorbing material. In order to obtain reliable results, the sample must fit perfectly into the cross section of the tube. In practice, this often results in a minimal gap between the sample and the wall of the tube. A narrow gap ... Read More

Many industrial applications require special treatments for fluid products, such as: deagglomeration, dispersion, homogenization, emulsion, special mixing or even catalysis of chemical reactions. Such effects can be obtained through cavitation in a closed ultrasonic reactor, in which it ... Read More

IntroductionThe application of power ultrasounds in food dehydration processes have shown a good performance in terms of efficiency, energy reduction and quality of the final product, allowing also a reduction in the convective drying kinetics, and at lower temperatures than conventional ... Read More

Fouling accumulation in pipelines is a known problem in industry which is currently treated by mechanical, hydraulic and chemical means. Each requiring a halt in the production to carry out the procedure. Industry requires a method that is non-invasive and can be used in-situ, Ultrasonic ... Read More

In a continuation of our previous work on the modelling of the dynamic microstructural viscous and thermal dissipation mechanisms in cylindrical fibrous porous materials, we have now extended the approach to include isotropic 3D Kelvin foam cell geometries having cylindrical strut ... Read More

Models generated from 3D image data (such as MRI or CT) are used in COMSOL Multiphysics® to analyse real-world problems and gain insights into biomechanical and industrial processes. We work with customers from different areas, from Life Sciences to Materials Science, to implement ... Read More

In our work, simulations of a piezoelectrical micromachined ultrasonic transducer compatible with CMOS-MEMS process are presented. The piezoelectric material of the PMUT is AlN sandwiched between two Al layers and a top Si3N4 passive layer. The piezoelectric and the metal materials have ... Read More

Ultrasound technology is deployed in a variety of scientific and engineering applications, ranging from the non-invasive retrieval of system information to the stirring of molten metals. While ultrasonic sound waves found a wide range of applications in liquid media, the use of those in ... Read More

Finite Element simulations are becoming an increasingly powerful tool in the transducer design process. The development of user-friendly software and predefined interfaces able to provide physics setup to predict the loudspeaker complex behavior helps designers in the product development ... Read More