Ground Vehicles

Superior comfort, fewer vibrations, reduced interior noise pressure levels, and stronger vehicle structures for electric vehicles cars, trucks and passenger vehicles, buses, trains and subways, and other ground vehicles.

Next Level
Cabin Experience

DTI's passive damping solutions are specifically designed to reduce interior sound levels and annoying vibrations in cabins.

Design Support

Our viscoelastic composites add damping properties to structures to control unwanted noise without adding unnecessary weight.

Fuel Efficiency
& Weight Optimization

DTI's solutions are lightweight and designed to integrate easily into existing structures without affecting aerodynamics or fuel efficiency.

CASE STUDY: Automotive Steering Wheel

The customer contacted DTI regarding attenuation of steering wheel “nibble” which manifests itself as tactile torsional vibration of the steering wheel between 60 mph and 85 mph. The phenomenon is a non-resonance, forced-vibration issue associated with unbalance of the front wheels. Maximum “nibble” occured at about 72 mph in this vehicle.

The steering wheel torsional vibration occurs in the 12 Hz to 15 Hz range, which corresponds to the 60 mph to 85 mph vehicle speed range.

DTI Configured an FEA Model of the steering system representing the torsional resonance of the system.  A Tuned Vibration Absorber (TVA) was designed and applied to the steering shaft to diminish the torsional dynamic inertance in the 60 mph to 80 mph speed range. The FEA model was utilized to optimize the TVA mass and to determine the appropriate TVA geometry. A viscoelastic material was selected for the application that exhibits stable modulus over a wide temperature range to maintain TVA tuning frequency.

Use of the TVA diminished steering “nibble” (vibration) about a factor of 5.0 at 72 mph.