![]() ![]() The interior of the speaker can be modeled using FEM with either the Poroacoustics model in the Pressure Acoustics, Frequency Domain interface or the Poroelastic Waves interface. In this case, the elastic properties of the cabinet and driver are important, and porous materials are used inside the enclosure. ![]() The picture shows an example of a loudspeaker system where the BEM-FEM approach is useful. The receiver location can easily be changed and it is not necessary to solve the model again to change the recording location for the impulse response. There is an option to enter a user-defined directivity for the receiver. ![]() This data set can also be exported for use in an external tool. The data set determines ray arrival time, recorded intensity, and frequency, and it is used by the Impulse Response plot. The sphere size can be determined either from an expression (based on the number of rays, the room volume, and the source-to-receiver distance) or it can be entered manually. The Receiver data set calculates the virtual intersection between rays and a sphere of finite size. The new Receiver data set collects the ray information and serves the purpose of a virtual microphone, providing data for the Impulse Response plot. Users can now postprocess the impulse response from a ray acoustics simulation with the new Impulse Response plot, which reconstructs and visualizes the impulse response based on receiver data. The image to the left shows the sound pressure level, while the image to the right shows the deformation of the array (there is constant phase shift applied for each row). In this model, a "sound-hard" sphere is placed roughly 30 wavelengths away from the source. Interaction between the tonpilz sonar array and a scattering object. The possibility of coupling BEM to FEM creates a highly versatile simulation environment for the automotive audio industry.” Acoustic engineers will get unprecedented modeling power by being able to analyze the full range of acoustic frequencies from the lowest bass notes to ultrasound, in addition to all of the possible multiphysics couplings available in the software. “We are pleased with the full range of methods available in COMSOL, from FEM and BEM, to ray tracing. “The recent addition of the boundary element method in COMSOL Multiphysics will enable us to model large acoustical radiation problems, such as, exterior sound reproduction for electric cars” comments Martin Olsen, Principal Engineer, Research, at Harman Lifestyle Audio. This exciting release is a result of a big focus on quality and major advances in new powerful modeling methods, increased speed, and user-driven enhancements.”ĬOMSOL 5.3a offers acoustics analysis based on the boundary element method. With the multiphysics modeling capabilities of our software, they can create innovative products faster and at a lower cost than ever before. As Svante Littmarck, COMSOL President and CEO details, “Our customers strive for a highly efficient product development cycle. ![]()
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