Today's power train applications have increased dynamics,
loads and temperatures while requirements for NVH increase and
power train packaging offers less space for shielding components to
protect surrounding parts.
Short development timing requires the use of FE analysis
forecasting durability, natural frequencies, stress levels and
structural parameter. While these parameters nowadays can be dealt
successfully with available simulation tools, it is still complex
to understand acoustical effects occurring at dynamically excited
heat shield applications which moreover depend on each other. The
design (form and material) and assembly of the majority of the
multi-layered heat shield components affect their acoustical
behavior. Due to the fact that application temperatures range
between 150°C at underbody parts and nearly 1000°C at hot ends,
suitable materials have to be chosen.
This publication describes which acoustical effects can occur on
heat shields. Furthermore this article describes what kinds of
materials are available for the wide operation temperature spectrum
and how to reach adequate solutions realizable in applications.