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In order to autonomously design the optimal descending trajectory for spacecraft soft landing on an asteroid, an onboard guidance based on the bidirectional extreme learning machine (B-ELM) is proposed. The optimization problem is formulated and transformed into a two-point boundary value problem (TPBVP). And then, based on the sample trajectories obtained off-line, a single-hidden layer feed-forward...
This paper presents a 6-DOF control of probe hovering in the irregular gravity field in the asteroid orbital frame. Considering the requirements of the scientific instruments pointing direction and orbit position in practical missions, the coordinate control of relative attitude and orbit between the probe and target asteroid is imperative. First, a 6-DOF dynamic equation is derived taking the irregular...
Most MEMS/NEMS devices are working on the harsh environment, such as high shock and temperature environment, ranging from aerospace science, automobile industry, mechanical engineering, to medical and safety engineering. The reliability of MEMS/NEMS devices is the most important issue today. MEMS devices must perform their required functions for the duration of the equipment's requirement profile...
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