Study on the dynamics simulation of sea launch vehicle erection system reversal
The potential collision of the launch vehicle against the support frame of the erection system during sea launch necessitates tilting the erection system backward to a certain angle prior to launch,ensuring sufficient drift space for the rocket.However,the oscillatory motion of the launch ship induced by wind and waves adversely affects the reversal process of the erection system.This research constructs a dynamic simulation model for sea launch vehicle erection system reversal based on the principles of multi-body dynamics.The model incorporates the non-linear six-degree-of-freedom coupled motion of a specific model of the launch ship under various sea conditions and wind-wave directions as boundary conditions.It examines the effects on the output force of hydraulic cylinders,the hinged support force of the erection rack,and typical sectional internal force changes of the support frame during the reversal process.The study finds that under sea conditions with larger wind-wave direction angles,fluctuations in the output force of the two hydraulic cylinders become significantly pronounced,displaying poorer synchronicity and instances where thrust transitions to pull force during the reversal process.Likewise,fluctuations in the hinged support force of the erection rack increase with the sea condition levels and wind-wave direction angles.Additionally,typical sectional internal forces of the support frame fluctuate around their gravitational values,with notable increases in lateral forces under conditions of larger wind-wave direction angles.These findings offer references for the safety and stability of the reversal process for sea launch vehicle erection systems.
multibody dynamicsdynamic platformcoupled motionerection system reversalsea launch
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