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This model presents a practical and efficient method to compute the sound transmission loss (STL) through a building component, specifically this example treats the case of a concrete wall. The method used here is valid as long as the component has little influence on the acoustic field ... 詳細を見る

This tutorial shows how to best solve full 3D vibro-electroacoustic multiphysics models of loudspeakers. The model is based on a 3D representation of the existing 2D axisymmetric Application Library model loudspeaker_driver found in the software. The setup of the physics is essentially ... 詳細を見る

In this model, the scattering coefficient of a Schroeder diffuser is calculated. This coefficient can then be used as input to express boundary conditions in typical room acoustic simulations. The effect of periodicity is also investigated by studying the responses from different ... 詳細を見る

Diesel particulate filters (DPFs) are designed to remove and filter soot (diesel particles) from the exhaust of diesel engine vehicles. The filters in such systems are typically structured with long, air-filled channels surrounded by a porous medium that retains the soot. Although the ... 詳細を見る

流体が材料やエネルギーの輸送に使用される場合, 流動する流体の速度を知ることは重要です. 流速を測定する飛行時間法または通過時間法では, 超音波信号をパイプ内の主流に伝達して, 非侵襲的に流速を測定します. 主流に対して角度を付けて信号を送信することにより, 超音波信号は主流の方向に移動する場合は音速よりも速く伝わり, 主流に逆らって移動する場合は音速よりも遅く伝わります. 2 つの方向の移動時間の差は, 主流の速度に比例して増加します. このタイプの流量計は, 特に産業環境で多くの用途があります. このチュートリアルモデルでは, COMSOL ... 詳細を見る

This model analyzes the operation of a micromirror in air and the effects of thermoviscous damping on the vibration response. The model includes thermal losses in the structure as well as thermoviscous acoustic phenomena. The model couples the Thermoelasticity multiphysics interface to ... 詳細を見る

Perforates are plates with a distribution of small perforations or holes. They are used in muffler systems, sound absorbing panels, and in many other places as liners, where it is important to control attenuation precisely. As the perforations become smaller and smaller, viscous and ... 詳細を見る

In this tutorial, the propagation of elastic waves in the ground after a seismic event is simulated using a 2D model. The effect of the ground surface topology on the wave propagation is illustrated when an ideal half space is modified with the presence of a small mountain. The model is ... 詳細を見る

Reflective mufflers are best suited for the low-frequency range where only plane waves can propagate in the system, while dissipative mufflers with fibers are efficient in the mid- to high-frequency range. Dissipative mufflers based on flow losses, on the other hand, also work at low ... 詳細を見る

This model is of the P.57 Type 4.3 Full-band Ear Simulator. The model includes the geometry of the ear canal as well as the pinna defined in the ITU-T P.57 standard. The model also includes interpolation data for an ear drum impedance ensuring correct acoustic properties of the ear. The ... 詳細を見る