A new methodology for the design of rotating vibration metabsorbers: numerical and experimental study

In the automotive industry, NVH (noise, vibration, harshness) performances significantly influence customer appreciations and the perceived quality of vehicles. In particular, the power train is one of the major sources of interior noise, that needs to be able to control torsional vibrations for different rotating regimes and acyclic rotation speeds. As NVH issues are not always the very first priority in the machine design and as acyclic sources are often not easy to cancel, different vibration dampers, filters or sinks can be very useful to apply on these rotating structures. In the present work focuses on the design of a torsional vibration trap, which can be seen as a metabsorber. An original and efficient numerical method for achieving the optimal design of such absorbers in the rotating frame is described on a representative use case, with different results which confirm the practical interest of such optimized traps.