High Frequency Dynamic Stiffness Measurements of Elastomer Mounts
* Präsentierender Autor
Zusammenfassung:With regard to electric powertrains the high frequency dynamic stiffness of bushes and mounts - especially in the range above 1 kHz - is of importance for the vehicle development process. For combustion engine mounts the typical frequency range of structural noise ends at 1kHz. Electric engines or gear tooth systems nevertheless produce disturbing noise at higher frequencies. Lightweight body structures with high dynamic stiffness additionally shift the sensitive range upwards to higher frequencies. Therefore the importance of structure-borne noise paths in the high frequency range strongly increases.A short overview of standard test benches in the frequency range of typically up to 1 kHz is provided. Additionally we present a test stand which makes it possible to measure the transfer stiffness in a range of up to 3 kHz, still under static preloads of up to 5kN.The testbench measurements are compared with direct force and stiffness measurements on system and full vehicle level.