アプリケーションギャラリ

潜水艦の主な防御力は, 作戦中に潜水艦を隠蔽し続ける能力にあります. 電波は海水に強く吸収されるため, 音響航法測距（ソナー）は潜水艦探知に用いられる主要な方法の一つです. ソナーシステムは, 水中探査や漁業にも用いられています. 設計者は, 潜水艦の等価反射面積を最小化するために, 音波の反射方法を解析します. ターゲット強度（TS）は, ソナーターゲットの面積を表す指標です. このチュートリアルでは, ベンチマークターゲットエコー強度シミュレーション（BeTTSi）を用いたベンチマーク潜水艦のTSを解析するための簡略化された手法を紹介します. ... 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

This tutorial simulates a standard test and benchmark model for perfectly matched layers (PMLs) as absorbing boundary conditions in the time domain. It involves the propagation of a transient Gaussian pulse with no flow. The Pressure Acoustics, Transient interface is used together with ... 詳細を見る

Headphones are closely coupled to the ear, and so it is not possible to measure their sensitivity in a classical acoustic free-field setup used for loudspeakers. The measurement requires the use of artificial heads and ears to accurately represent the usage conditions. This model shows ... 詳細を見る

計算性能の向上と新しい数値手法の開発により, 室内音響シミュレーションにおける波動ベースの技術の使用はここ数年で広まっています. 壁における現実的なインピーダンス条件を含めるという課題は, 従来は周波数領域で解決されてきました. 最近の研究では, データの部分分数表現を使用して, 時間領域モデルに周波数依存インピーダンスを実装することに重点が置かれています. このチュートリアルでは, 部分分数フィット関数を使用して周波数依存の壁インピーダンスデータの部分分数表現を取得する方法と, ... 詳細を見る

This model determines the reflection coefficient of plane acoustic waves, at different frequencies and at different angles of incidence, off a water-sediment interface. The ability of the Poroelasitc Waves interface to model the coupled acoustic and elastic wave in any porous substance ... 詳細を見る

Piezoelectric devices are widely used as sources to generate sound waves or receivers to detect acoustic signals. In applications such as ultrasound imaging and nondestructive testing, the same transducer can be used as a transmitter to send a source signal and receiver to detect ... 詳細を見る

This is a model of a moving-coil loudspeaker where a lumped parameter analogy represents the behavior of the electrical and mechanical speaker components. The Thiele-Small parameters (small-signal parameters) serve as input to the lumped model, which is represented by an Electric Circuit ... 詳細を見る

This tutorial showcases the principles of the immersion ultrasonic testing technique. A search unit placed in a water tank sends an ultrasonic pulse signal that scatters off a solid object. Part of the signal is reflected back to the search unit by the object and possible flaws in it. By ... 詳細を見る

This example of a simple axisymmetric condenser microphone includes all the relevant physics and determines the microphone sensitivity as well as microphone capacitance for the specific simplified microphone geometry and material parameters. It solves a fully coupled multiphysics model ... 詳細を見る