Acoustics Simulation for High-Tech

Manufacturers and suppliers use Realistic Simulation Solutions from SIMULIA to evaluate design alternatives, collaborate on projects and leverage computing resources for more efficient design analysis

Courtesy of GN Resound

High-Tech consumers are constantly driving manufacturers to produce smaller devices with more features. For example, today’s cell phones are much smaller than 5 years ago but may now include a camera, music player, web or wireless connectivity, video capability, GPS and more. This progress offers a particular set of problems for acoustics design.

  • The speaker itself has to be smaller and so more power is needed to produce the same acoustic response as a larger speaker.
  • The smaller overall device size, containing many closely spaced components, means that less space is available for acoustic cavities.
  • The air present in the small back volume behind the speaker resists the displacement of the diaphragm and hence the sound it generates, particularly at lower frequencies.
  • Nonlinear materials such as rubber or fiber materials are often used to damp out high response at resonant frequencies or as a protective shield to guard the unit from environmental effects.

In such cases, simple circuit simulation tools, that assume the system to comprise of lumped mass parameters, fail to produce accurate results.

The Abaqus Multiphysics FEA product suite from SIMULIA integrates noise simulation within the finite element solver, allowing fully-coupled structural-acoustic simulations to be performed within familiar Abaqus workflows. Furthermore, the compatibility of the Abaqus product family allows the same structural mesh to be used for other load cases, for example, a drop test or thermal simulations.

Solution Capabilities

  • Unified modeling and simulation environment based on Abaqus/CAE
    • Tools available to simply and efficiently build complex electronics assemblies from Electrical-CAD data
    • Associative import from various CAD packages allow geometry design changes to be efficiently transferred to the analysis model
    • Boolean tools for creating acoustic cavities
  • Acoustic finite materials, elements and constraints
    • Frequency dependent material properties, common in rubbers
    • Adaptive acoustic meshes for large-deformation enclosures (seals, etc)
    • Nonreflecting impedance and infinite elements for exterior and radiation problems
    • Surface-based acoustic-structural coupling
  • Fast, advanced solvers for acoustic and solid media
    • Fully-coupled and uncoupled natural frequency analysis
    • Fully-coupled frequency response
    • Transient and time-harmonic (steady-state) analysis