Development of Mount for Electric Powertrains - A Multi Degree of Freedom Optimisation Approach 2020-01-0417
This paper is based on electric vehicle mounting system where the consideration of multi degree of freedom including cradle system is required to enhance the predictability of various modes. As electric engines are quieter compared to IC engines, the small vibration issue resulted bigger engine presence in the passenger cabin. By proposer modal placement of all major EV components, it is possible to isolate the system to avoid resonance.
For the mounting of electric powertrains, the systems used are based on combustion engines and adapted exclusively for the new application. However, electric powertrains differ significantly from conventional drives in relation to NVH, such as in their weight, mass inertia, torque, and excitation forces and moments.
Consequently, it stands to reason that mounting systems optimized for use with combustion engines do not necessarily inline with the best solution for electric powertrains. Furthermore, electric motors produce excitations in a considerably higher frequency range than combustion engines.
This paper presents 22 degree of freedom analysis for 3 point and 4 point mounting system.
Results are compared with actual vehicle test for 3 point system.