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4 Structure and Mechanism Technology of Lunar Lander
Fig. 4.27 Simulation of ladders deployment
Fig. 4.28 Simulation of
driving torque of the transfer
mechanism when maximum
pitch of the lander is +15°
the moment of gravity could be a “negative moment”, i.e. the lunar gravity was drag
for motion of the transfer mechanism instead of driving force. In order to avoid the
transfer mechanism’s failure under the extreme landing attitude, a dynamic analysis
of motion of the transfer mechanism under extreme landing attitude was conducted
through dynamic simulation to determine the driving force required. The design of
the transfer mechanism was optimized through analysis to make the required driving
force of the transfer mechanism under extreme landing attitude as small as possible.
The analysis result of the driving torque of the transfer mechanism when the lander
was tilted by maximum +15° is shown in Fig. 4.28.
The two ladders of the transfer mechanism were deigned to move synchronously
before touching lunar surface and adapt to lunar surface respectively after touching
lunar surface. The simulation analysis of lunar surface adaptability of ladders of