Acoustic analyses using Matlab® and Ansys® - download pdf or read online

By Carl Q Howard; Benjamin S Cazzolato

ISBN-10: 1482223279

ISBN-13: 9781482223279

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2) where [Kf ] is the equivalent fluid stiffness matrix, [Mf ] is the equivalent fluid mass matrix, {Ff } is a vector of applied fluid loads, {p} is a vector of unknown nodal acoustic pressures, and {¨ p} is a vector of the second derivative of acoustic pressure with respect to time. There are four acoustic element types available in ANSYS that are based on pressure formulation: types FLUID29, FLUID30, FLUID220, and FLUID221. 7 describes the capabilities of these elements. 4 Fluid–Structure Interaction The previous section described a standard pressure-formulated acoustic element.

However, there are other issues that only affect transient analysis. The mode-superposition method is restricted to fixed time steps throughout the analysis, so automatic time stepping is not allowed. Such a feature is often desirable when there are events of differing time scales. Without automatic time stepping, the shortest time scale needs to be used over the entire simulation, which can increase solution times. The full method accepts non-zero displacements as a form of load, whereas the mode-superposition method does not.

2 Finite element model with displacement-formulated acoustic elements connected to structural elements. The difference between the solid structural elements and fluid elements is that the underlying material behavior is altered to reflect the behavior of a fluid, so that the stiffness terms associated with shear stresses are set to near zero and the Young’s modulus is set equal to the bulk modulus of the fluid. What this means is that the element has no ability to resist shear stress and can lead to peculiar results.

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Acoustic analyses using Matlab® and Ansys® by Carl Q Howard; Benjamin S Cazzolato

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