Noise and vibration control

A variety of active and passive methods can be used to reduce cabin noise and fuselage vibration

Controlling the vibration and cabin noise levels of fixed-wing aircraft has continued to be a challenge to engineers. The two basic functions for mounting systems - to constrain motion and to provide vibration isolation and noise reduction - are conflicting.

Mounting systems must limit the relative motion between two structures created by thrust, g loads, weight, and torque. The mounting system must be relatively stiff to minimize relative motions. To achieve vibration isolation and noise reduction in the cabin area, transmission of vibration between structures must be minimized, requiring a relatively soft mounting system. This inherent problem requires compromise and flexibility in the engine attachment design.