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Acoustics Tips (7 entries)
 
Acoustic Elements [ZIP]
  Sheldon Imaoka (ANSYS, Inc.)
  "For many years, ANSYS has 2D and 3D acoustic elements, including those used to model an “infinite” boundary. These elements can be used in modal, harmonic, and transient analyses, and fluid-structural interaction can also be accounted for in these simulations.

This memo hopes to review the following topics related to harmonic acoustic analyses: basic comparison of structural and acoustic elements, modeling complex impedance boundary conditions, and defining complex pressure loading. A set of input files, which analyze the case of a simple radiating sphere, is included with this memo."

(Week 28, week of 01/02/05.)
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Average Rating: 9.5 (39 votes)  
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Acoustic Postprocessing [ZIP]
  Sheldon Imaoka (ANSYS, Inc.)
  "Acoustic analyses in ANSYS provides insight to the propagation of sound, and both visual and aural postprocessing can aid in this objective. This memo hopes to cover postprocessing methods for acoustic problems other than standard contour and XY plots."
(Week 42, week of 11/18/07)
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Average Rating: 10.0 (9 votes)  
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Comparison of FLUID29 and FLUID79 Elements
  Carl Howard (University of Adelaide)
  "Analyses were conducted to verify that similar results could be obtained by using the displacement formulated fluid elements FLUID79 or the pressure formulated fluid elements FLUID29."
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Average Rating: 10.0 (7 votes)  
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Comparison of Rectangular and Spherical Models
  Carl Howard (University of Adelaide)
  "The purpose of this investigation was to compare the two modelling techniques for an infinite boundary. The first technique involves setting the elements on the edges of the model to have an absorptive property by changing the material properties so that mu=1. The second technique involves the use of infinite elements (infinite129) that must be placed on a constant radius curvature."
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Average Rating: 10.0 (11 votes)  
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Coupling low-order elements to high-order elements in ANSYS
  Aaron Acton
  "This article presents several methods for obtaining coupling at the interface between low- and high-order elements in ANSYS. This situation can be encountered when modelling the fluid-structure interaction between a solid domain, modelled with quadratic elements, and an acoustic fluid domain, modelled with linear elements. The two methods determined to be most suitable for achieving this coupling are by using either constraint equations or contact elements, both of which are likely more-robust methods than by simply attaching coincident nodes on matching meshes. Examples are provided for each case described herein, and the results from each are compared to the ANSYS 11.0 verification problem VM177."
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Average Rating: 9.0 (10 votes)  
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MUFFLER
  Sheldon Imaoka (ANSYS, Inc.)
  This memo provides basic instruction on performing acoustic analyses in Workbench Mechanical 14.0. An example of calculation of transmission loss in a muffler is demonstrated.
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Average Rating: 8.8 (25 votes)  
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Superelements in acoustic analyses
  Sheldon Imaoka (CSI)
  Using superelements in acoustic analyses. (From XANSYS posting)
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Average Rating: 7.7 (13 votes)  
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