A hybrid control scheme for vibration reduction of flexible spacecraft during rotational maneuvers is investigated by using variable structure output feedback control (VSOFC) for attitude control and smart materials for active vibration suppression. The proposed control design process is twofold: design of the attitude controller using VSOFC theory acting on the hub and design of an independent...

This paper investigates the problem of synchronizing the chaotic attitude dynamics of multiple spacecraft is investigated based on the distributed predictive control approach. Kinematic and dynamic equations are used to describe the spacecraft system according to the Modified Rodriguez Parameters representation. The respective method follows the sequential and cooperative structure of distribut...

In view of the issue of rapid attitude maneuver control of agile satellite, this paper presents an attitude-tracking control algorithm with path planning based on the improved genetic algorithm, adaptive backstepping control as well as sliding mode control. The satellite applies double gimbal control moment gyro as actuator and is subjected to the external disturbance and uncertain inertia prop...

Virginia Tech has developed a testbed comprised of two independent spherical air-bearing platforms for formation flying attitude control simulation, the Distributed Spacecraft Attitude Control System Simulator (DSACSS). The DSACSS provides the flexibility to experimentally implement many types of control techniques. Novel individual platform control options include nonlinear compensation of an ...

This paper presents a nonlinear H∞ state feedback attitude control design method for spacecraft large angle maneuvers, which is subject to moment-of-inertia (MOI) uncertainty. Moreover, the operation of attitude maneuver is affected by external disturbances. The attitude control design thus employs a nonlinear H∞ method to achieve stability and robustness so that both MOI uncertainty and extern...

Surprisingly, organizational control theory predicated on monitoring behavior and/or outputs has rarely been challenged or extended. The rise of remote work offers an important opportunity to (re)examine the underlying relationship between and control. Distributed teams, where members remotely, call into question assumption that rests fundamentally solely outputs. Using interview diary data fro...

background: in recent years, dentists have more opportunity of treating patients infected with blood-borne pathogens. although compliance with infection control practice (icp) in dental practice is required, it is not still sufficiently spread in japan. objective: to identify factors associated with compliance with icps in the population of japanese dentists. methods: in a questionnaire-based c...