Consultez les proceedings de la Conference COMSOL 2020
Acoustic Scattering through a Circular Orifice in Low Mach Number Flow
The acoustic scattering through a circular orifice plate in a duct with low Mach number flow (M=0.1) is computed using the Linearized Navier-Stokes physics interface of COMSOL Multiphysics®. The work by Kierkegaard et al. is extended to account for higher order acoustic modes, i.e., ... En savoir plus
Simulation of Pearl-Chain Formation of Microparticles by Acoustic Standing Waves, including Inter-Particle Forces and Collisions
Acoustic standing waves can be used to manipulate micrometer sized particles, cells and organisms. In most applications these objects are driven towards pressure nodal lines, predominantly by the primary acoustic radiation force. Interestingly, at intermediate particle concentrations, ... En savoir plus
Numerical Analysis of an Ultrasonic Technology for Food Dehydration Intensification
Food dehydration processes assisted by high-power ultrasound (HPU) have become an efficient technology with a great potential in its implementation. To produce the desired effects in the samples, it is necessary that the dehydration system, composed by a HPU transducer and an ultrasonic ... En savoir plus
Modeling the Effect of a Crack on the Flow-Induced Vibration of Supported Pipes
In this paper, the effect of a crack to the flow-induced vibration characteristics of supported pipes is investigated based on vibration method. In order to estimate the crack location and depth in the pipe, we need to utilize the variation of the difference between the natural ... En savoir plus
Phase Decomposition for Loudspeaker Analysis
The vibration of an electrodynamic loudspeaker driver causes a resulting sound pressure. For simple pistonic vibration, there is a simple relationship between the vibration and the sound pressure. For complex vibration patterns, however, different parts of the vibrating surface ... En savoir plus
Numerical Study on the Mechanism of Interface Debonding Detection for CFST with PZT
Introduction In order to understand the detection mechanism of the PZT based nondestructive testing (NDT) technology for interface debonding of CFSTs, numerical simulation on a multi-physical model composed of surface-mounted PZT patches and CFST structural member is established in ... En savoir plus
Numerical Simulation of Acoustic Properties of Porous Metals under High Sound Pressure Level Conditions
The sound propagation and absorption properties in porous media under high sound pressure level conditions have been reported elsewhere. Also several analytical and semi-analytical solutions have been developed; however, these solutions are relatively complicated and the provided results ... En savoir plus
基频最大的经纬仪基座的拓扑优化
In order to satisfy the requirements of modern range measuring technology, photoelectric theodolites gradually develop towards lightweight and minitype design. As a consequence, the mobile theodolite is becoming a hot spot recently. New requirements are raised for the theodolite base ... En savoir plus
Multiphysics Simulations of Automotive Muffler
This paper deals with the numerical experiments for early prediction of muffler performance at the design stage. In this experiment, a Reactive Muffler is developed and validated numerically compared to traditional built and test process. En savoir plus
Effect of Length and Porosity on the Acoustic Performance of Concentric Tube Resonators
The acoustic performance of an acoustically short Concentric Tube Resonator (CTR) is investigated to find an optimum porosity for a given length to diameter ratio. The study is motivated by the following practical difficulties encountered in automotive exhaust noise control: 1. ... En savoir plus