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The dependent variables are the acoustic pressure and the acoustic velocity perturbations. The Pressure Acoustics, Time Explicit interface solves the linearized Euler equations assuming an adiabatic equation of state. The COMSOL Multiphysics GUI shown with the Small Concert Hall Acoustics model and the Settings window for the Impulse Response plot and the resulting impulse response. Important application areas for this new interface include transient propagation of audio pulses in room acoustics and scattering phenomena involving large objects relative to the wavelength.
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The interface is available in 2D, 2D axisymmetric, and 3D. The exterior scattered far-field can be calculated by combining the Far-Field Calculation feature with a Time to Frequency FFT study step. There is an additional Background Acoustic Field option for modeling scattering problems and you can use absorbing layers to set up effective nonreflecting-like boundary conditions. The interface can be used to solve large, transient, linear acoustic simulations that contain many wavelengths, and is well suited for time-dependent simulations with arbitrary time-dependent sources and fields. The plot generates the impulse response with a default sampling of 44,100 Hz.Ī new physics interface, Pressure Acoustics, Time Explicit, based on the discontinuous Galerkin (dG-FEM) formulation, employs a time-explicit method that is memory efficient, with low memory consumption. The same resolution should be used for all sources and wall properties, for example, the absorption and scattering coefficients, source power, and so forth. The Impulse Response plot interprets the ray data from the receiver using an octave, 1/3 octave, or 1/6 octave frequency resolution. The vibrating structures can be modeled with solids, shells, or both, and the exterior acoustics domain can be modeled with BEM. 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.