Current control approaches for solar sail station-keeping on libration point orbits have not considered the degradation of sail’s optical properties. However, significant could lead to poor performance or even complete failure. This paper presents an integrated guidance and strategy address this problem by updating reference orbit based in situ estimation. An exponential model is incorporated i...

Compact zero-mass pulsatile jet actuators are proposed for low speed maneuvering, ducking, and station keeping of small underwater vehicles. To this end, optimization of synthetic jets for maximal thrust generation is investigated. Flow field of such jets are initially dominated by vortex ring formation. Pinched-off vortices characterize the extremum impulse accumulated by the leading vortex ri...

This paper considers aspects related to the problem of automatic tuning (autotuning) of dynamic positioning (DP) controllers for marine surface vessels. Autotuning involves automatic adjustment of controller parameters for shifting vessel operational conditions (VOCs), which encompass changing vessel dynamics and different operational tasks. A controller with fixed gains cannot behave equally w...

The halo orbits around the Earth-Moon L2 libration point provide a great candidate orbit for a lunar communication satellite, where the satellite remains above the horizon on the far side of the Moon being visible from the Earth at all times. Such orbits are generally unstable, and station-keeping strategies are required to control the satellite to remain close to the reference orbit. A recentl...