Technical Paper
Application of NVH Countermeasures for Cabin Boom Isolation using Hydraulic Bushing and Silicone Tuned Mass Absorber
2006-04-03
2006-01-1681
Driveline (torque tube) boom, excited by a V6 powertrain’s 3rd order pulse signal, can produce high sound pressure levels in a vehicle’s cabin. Past solutions that have been used as countermeasures include; adding mass, tuned mass absorbers, isolating the torque tube with cardboard or other media, and using an elastomeric isolator (between the torque tube and the body). Specifically, we will show how to properly address temperature variation as it applies to tuned mass absorbers in driveline/torque tube applications, as well as show how to minimize production variation by using a robust design for the tuned mass absorber. Documentation will be shown detailing how higher temperature elastomers (silicon, EPDM, etc.) compare to natural rubber from a temperature variation standpoint. This is critical to the design of tuned mass absorbers as they apply to sensitive structures that require high damping levels in a narrow frequency bandwidth.