Keywords: transfer matrix, vibration isolation, periodic mounts, periodic structures, vehicle noise, vehicle vibration, vibration transmission
Vibration attenuation of automotive vehicle engine using periodic mounts
In this paper, a new class of periodic mounts for isolating the vibration transmission from vehicle engine to the car body and seats is presented. Periodic mounts exhibit unique dynamic characteristics that make them act as mechanical filters for wave propagation. As a result, waves can propagate along the periodic mounts only within specific frequency bands called the 'Pass Bands' and wave propagation is completely blocked within other frequency bands called the 'Stop Bands'. The experimental arrangements, including the design of mounting systems with plain and periodic mounts are studied first. The effectiveness of the periodicity on the vibration levels of mounting systems has been demonstrated theoretically and experimentally. The experimental results are compared with the theoretical predictions.