Acoustical effects on heat shields, operation temperatures, used materials and solutions 2010-36-0050

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.