A review of available information on the acoustical and vibrational aspects of manned space flight.

T H I S P A P E R is a review of the problem of noise and vibration with respect to manned space flight. For the purposes of this discussion, noise will be defined as the energy transmitted to a man through the air at all frequencies up to 15,000 cps. Vibration will be defined as all of the energy transmitted to a man through the structural components for all frequencies above 0.5 cps. The separation of noise and vibration with respect to space vehicle problems in this report is entirely a matter of convenience. The sources of the vibration and noise impinging upon a man in a vehicle are ultimately one and the same. Fluctuating pressure levels from several sources cause the capsule structure to vibrate, which results in the transmission of this energy through the air as noise, and through the seat structure as vibration.