Space Launch System Loads For the SLS Loads project, DCI supports MSFC’s Dynamics,
Loads and Strength Branch. This support
includes integrated vehicle loads analysis for:
- Rollout: Rollout
loads analysis determines vehicle loading associated with transportation from
VAB to pad. This analysis includes the
crawler induced base motion and wind loads including vortex shedding.
Prelaunch loads analysis determines vehicle loading while at the pad prior to
launch. The wind loads include static
drag and lift forces from steady state wind and gusts, as well as dynamic lift
forces due to vortex shedding.
- Liftoff: The Liftoff loads analysis determines
loads induced by engine and booster thrust, ignition over pressure (IOP), wind,
autopilot control forces, and the twang release of the vehicle from the mobile
launcher (ML). The Liftoff analysis
utilizes Monte Carlo analysis due to the random nature of many of the
inputs. The Liftoff analysis begins with
engine ignition and continues up through tower clearance.
- Ascent: The Ascent analysis determines loads due to aero-elastic loads,
atmospheric turbulence, buffeting, maneuvering loads, and thrust
oscillation. The Ascent analysis begins
at tower clearance in boost phase flight and continues through core stage
flight. The boost phase analysis incorporated
axial static elastic loads (STEL), lateral STEL, lateral gust, buffet, roll
maneuver (static and elastic), tailoff, thrust oscillation, and unplanned
single engine-out analyses. The total
Ascent loads are determined using a statistical load combination equation.