maximum expected random vibration spectrum


maximum expected environment imposed on the space segment element and space segment equipment due to broad band random forcing functions within the launch element or space segment element during flight or from ground transportation and handling


  • NOTE 1 E.g. lift-off acoustic field, aerodynamic excitations, and transmitted structure-borne vibration.
  • NOTE 2 A different spectrum can exist for different space segment equipment zones or for different axis. The space segment equipment vibration levels are based on vibration response measurements or model prediction made at the space segment equipment attachment points during ground acoustic tests or during flight. The duration of the maximum environment is the total period during flight when the overall level is within 6 dB of the maximum overall level.
  • NOTE 3 The power spectral density is based on a frequency resolution of 1/6 octave (or narrower) bandwidth analysis, over a frequency range of 20 Hz to 2000 Hz.
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