Solving NVH Optimization Problems Assisted by HyperWorks
Dr. Dennis Schwerzler, Altair Engineering
Solving automotive NVH problems typically involves analyzing
and aligning critical modes in the
low frequency range (<100 hz). In the mid frequency range
(100-500 hz), the main concerns are
identifying and treating dominant noise transfer
paths. HyperWorks provides extensive tools
for
studying both modes and transfer paths. NV
Director is a template driven tool in HyperMesh
that automates complex model assembly and analysis
setup tasks. It is capable of assembling both
fully detailed FE subsystem models and reduced
superelement models based on the demand of
the simulation loadcase. AMLS can be used as
a part of Radioss analysis to reduce run time
of
large models.Acoustic cavities can now be easily
created inside HyperMesh. Fluid structure interface
can be automatically defined during Radioss
analysis and verified by viewing an interface
output file. Diagnosing root causes of an NVH
problem can be done by reviewing various post-processing
outputs such as modal participation, power
flow and energy, transfer path analysis, grid
participation, and design sensitivity in an
integrated fashion. Contribution and sensitivity
results
can be utilized in post-processing to study
what design parameters are critical in getting
a response to target without re-running the analysis.
Finally, critical design parameters are optimized
for NVH performance, weight and cost.
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