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The performance comparison is performed among Legendre (LPM), Gauss (GPM), and Radau (RPM) pseudospectral methods, which are utilized to optimize the low-thrust Earth-Mars rendezvous trajectories. In order to provide a fair comparison condition, a shape-based approach is implemented to provide equivalent initial guesses for all the next accurate optimization, and the SQP algorithm is used to solve...
All Mars landers to date continue to rely on the entry, descent and landing (EDL) technologies developed for the Viking missions in the mid-seventies of the last century. Viking-like landers adopt the inertial navigation and unguided entry mode, which lead to the larger landing error ellipse and lower elevation landing site restriction. Next-generation Mars missions requires the capability of pin-point...
Trajectory planning of robots is not only an important research field of robotics, but also an challenging combination of artificial intelligence and robotics. Trajectory planning is a key technology of Unmanned Aerial Vehicle (UAV). It is also a prerequisite for autonomous navigation of UAV. Under the static environment distributing of obstacles, seeking a shortest path from the starting point to...
Electron emission characteristics of a triode surface-conduction field emission display were simulated with finite element analysis method and MATLAB. The parameters of the display structure were optimized based on the simulation results. Field emission from the carbon nanotubes and ZnO nanotetrapod compound cathodes were also simulated and studied.
A recent paper proposed an MPC methodology which achieved a considerable reduction in the online optimization by transferring some of the computational load to calculations that can be performed offline. The approach was based on an augmented autonomous state space formulations of the prediction dynamics and gained significantly in efficiency by imposing a terminal constraint at current time. The...
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