Large vehicles, such as sport utility vehicles (SUVs) and minivans, exhibit body boom phenomena during multiple source excitation events including rough road/impact and power-train induced events. The main cause of the boom is the low-frequency acoustic/vibroacoustic standing waves (modes) of the cabin cavity being excited via the high acoustic transfer functions at multiple paths, due to an inherently weak body structure and/or existence of popular features such as tailgates with their corresponding dynamics. Abating the boom noise by modifying the response is the more viable and less costly option than body changes. Active acoustic damping can do such modification, cost-effectively.
DEICON developed an active boom noise control solution to add acoustic damping to the low-frequency standing waves inside the cabin of a large SUV to quiet its tonal boom noise. The existing stock 8 inch subwoofer of the vehicle’s sound system as well as one of the existing microphones built into the headliner of the vehicle were used in the active boom noise control solution.