Quiet in the cab

As NVH gains importance in the quality of off-highway machines' performance and operator comfort, it is essential to understand every aspect of the machine noises and its annoyance effect to the operator's comfort.

In the off-highway environment, it is essential to understand every aspect of machine noise and annoyance effects, and then reduce the noise to a level that does not affect the operator's comfort and performance. Booming noise, a low-frequency NVH phenomenon below 200 Hz, defined as a continuous bass drum roll, distant thunder sound, or a deep resonant sound like an explosion, is a primary concern of off-highway equipment.

The booming noise in off-highway equipment can be caused by a combination of factors, including the low natural frequencies of the large panels of machine cabs; the low acoustic modes of the cab cavity; the low frequency machine noise sources such as engine, exhaust, cooling fan system, etc.; and the machine work tools and ground interaction.