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Taking on NVH reduction techniques

  • Magazine Feature Article
  • 15OFHP02_03
Published February 01, 2015 by SAE International in United States
  • English

A look at the enhanced durability benefits obtained by changing the polymer composition, manufacturing methods, and design optimization of a powertrain mount for an off-highway vehicle.

The internal-combustion engine and other types of vehicle propulsion systems produce various forms of vibrations that may be undesirably transmitted to the vehicle frame. These vibrations may be high or low in amplitude and high or low in frequency. Elastomeric materials, and in particular natural rubber (NR), have been used for some time in vibration-control components that serve to isolate any engine-induced noise and vibration from being transmitted to the cabin of the commercial vehicle.

Engine mounts are used on four sides of the engine to isolate vibration to the supporting member. Normally mounts are made of steel and rubber, with the steel acting as a load-bearing member and rubber acting as a dampening element. Some conventional rubber insulators fail to exhibit satisfactory performance, particularly against the vibration that is transmitted from the engine unit to the vehicle body. Durability is also a major concern.