3.3 Mission Analysis
69
Fig. 3.13 Staying time and ascending height in vacuum for lunar dust particles at different initial
velocity
on lunar lander was not obvious because the time was short and the
concentration of small particles was lower.
(2) Lunar dust activated by landing impact. The activated lunar dust by touching
lunar surface of landing cushion mechanism could be analyzed by digital simulation and test to obtain its space distribution and deposition. Fox example,
analysis result of staying time and ascending height for lunar dust particles at
different initial velocity is shown in Fig. 3.13 for the CE-3 lunar lander.
The analysis results implied that the effects of lunar dust activated by engine plume
and landing impact on lunar lander were not obvious. Appropriate measures could
be adopted to mitigate its effects as much as possible.
3) Analysis of vibration dynamic environment of engine thrust for orbit control
There was usually a main engine with large thrust for orbit control and soft landing.
When the main engine was ignited, there would be high frequency vibration of
thrust because of the inherent combustion instability in the combustion chamber.
When the vibration force acts on lunar lander, there might be abnormal output of
high accuracy sensors such as accelerometer and gyroscope which are sensitive to
middle and high frequency vibrations. Therefore the vibration dynamic environment
should be studied to evaluate its effects on sensors. The 7500 N throttlable engine
was the largest engine on China’s spacecraft. The vibration dynamic environment of
7500 N throttlable engine was measured and the result of typical working condition
is shown in Fig. 3.14.
69
Fig. 3.13 Staying time and ascending height in vacuum for lunar dust particles at different initial
velocity
on lunar lander was not obvious because the time was short and the
concentration of small particles was lower.
(2) Lunar dust activated by landing impact. The activated lunar dust by touching
lunar surface of landing cushion mechanism could be analyzed by digital simulation and test to obtain its space distribution and deposition. Fox example,
analysis result of staying time and ascending height for lunar dust particles at
different initial velocity is shown in Fig. 3.13 for the CE-3 lunar lander.
The analysis results implied that the effects of lunar dust activated by engine plume
and landing impact on lunar lander were not obvious. Appropriate measures could
be adopted to mitigate its effects as much as possible.
3) Analysis of vibration dynamic environment of engine thrust for orbit control
There was usually a main engine with large thrust for orbit control and soft landing.
When the main engine was ignited, there would be high frequency vibration of
thrust because of the inherent combustion instability in the combustion chamber.
When the vibration force acts on lunar lander, there might be abnormal output of
high accuracy sensors such as accelerometer and gyroscope which are sensitive to
middle and high frequency vibrations. Therefore the vibration dynamic environment
should be studied to evaluate its effects on sensors. The 7500 N throttlable engine
was the largest engine on China’s spacecraft. The vibration dynamic environment of
7500 N throttlable engine was measured and the result of typical working condition
is shown in Fig. 3.14.