Infrasound (IS) in cars is quite strong and may be responsible for health effects. This paper presents measurements and simplified mechanisms for the production of IS in vehicles. Four mechanisms are proposed: (1) turbulence from the moving vehicle or other traffic, infusing through the vents; (2) flexing of the body causing volume changes; (3) acceleration of the vehicle, causing an inertial reaction from the enclosed and external air; and (4) pressure variations due to altitude changes. The acoustic pressure from these mechanisms can be simplified by the fact that IS wavelengths are much larger than the size of the vehicle. Measurements are interesting and analyzed to elucidate the acoustic contribution of each mechanism.
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.