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The leaderless synchronization of multiple agents modeled by nonlinear Euler-Lagrange equation is investigated under limited directed communication. An adaptive cooperative control law is proposed to synchronize the whole group with parametric uncertainties. It is proved that synchronization can be achieved if and only if the communication graph has a directed spanning tree. Lyapunov theory and eigenvalue-based...
Dyeing of PET yarn in supercritical carbon dioxide can reduce water usage, prevent pollution and save energy. Effects of supercritical conditions on the uniformity of PET package were investigated with a pilot plant. It was found that the uniformity of PET package is improved as the CO2 flow rate increasing. The dyeing process with optimum flow reversal yield more uniform samples than those without,...
Relative navigation is one of the key technologies for formation missions, and is challenge for the time delay between different measurements and the communication jam between the navigation node and base station. This paper develops an efficient approach to deal with the relative range time delay, in this approach different relative range measurements are mapped to a uniform time node by using one...
The formation relative motion control by using one body fixed thruster and reaction wheels is a challenging problem due to the coupled translational and rotational dynamics. As the thruster vector depends on the current attitude and its angular velocity, and some of the attitude constraints also couple the position and attitude of the spacecraft, it makes the formation control problem high dimensional...
A new method for orbit and attitude determination of satellite simultaneously based on three-axis-magnetometer (TAM) and gyro data is presented, which is a breakthrough in traditional pattern of treating orbit and attitude of satellite separately. Considering of the nonlinear system, a modified unscented Kalman filter is developed. The magnetic field components are used to update as measurement and...
The initial sizing of the propulsion system takes an important role in the preliminary design stage for space missions. The aim of this paper is to present an initial sizing method to evaluate the amount of propellant required for the on-orbit servicing spacecraft that can upgrade on-orbit satellites. Specially, one servicing spacecraft (SSc) is considered to be initially in the same direction as...
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