The Space Station Freedom microgravity environment

The SSF microgravity environment is discussed focusing on requirements derived from initial specifications proposed by the NASA Office of Space Science and Applications and on microgravity assessment methods including quasi-steady, structural dynamic, and vibroacoustic methods. Preliminary results indicate that the flight dynamics of the vehicle meet the requirements for both scientific and engineering communities, but that a number of vibroacoustic disturbance sources violate the criteria. The assessment updates along with planned on-orbit acceleration measurements and crew disturbance characterizations are being carried out to clearly define and understand the acceleration environment.