2014
DOI: 10.2514/1.60380
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Automatic Mass Balancing of a Spacecraft Three-Axis Simulator: Analysis and Experimentation

Abstract: Spacecraft three-axis simulators provide frictionless and, ideally, torque-free hardware simulation platforms that are crucial for validating spacecraft attitude determination and control strategies. To reduce the gravitational torque, the distance between the simulator center of mass and the center of rotation needs to be minimized. This work proposes an automatic mass balancing system for spacecraft simulators, which uses only the three sliding masses during the balancing process, without need of further act… Show more

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Cited by 46 publications
(38 citation statements)
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“…The disturbance torques are usually non-zero-mean. The equations with disturbance torque T is written as equation (19) and equation (20). Because the output torques of reaction wheels are square waves of 0.1 ± Nm amplitude during system identification, the (13) and (17) for system identification.…”
Section: Least-squares Estimation Using Extend Tracking Differentiatormentioning
confidence: 99%
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“…The disturbance torques are usually non-zero-mean. The equations with disturbance torque T is written as equation (19) and equation (20). Because the output torques of reaction wheels are square waves of 0.1 ± Nm amplitude during system identification, the (13) and (17) for system identification.…”
Section: Least-squares Estimation Using Extend Tracking Differentiatormentioning
confidence: 99%
“…Reference [19] uses three linear actuators as excitation for identification and estimates the states and the center of mass by joint EKF in simulation. The vertical offset between the simulator center of mass and the center of rotation is estimated for automatic mass balancing using UKF [20] .…”
mentioning
confidence: 99%
“…In particular, among the performance indexes verified as part of the development, a remarkable one is the disturbance torque acting on the articulated air-bearing, which has been reduced down to the 10 −5 Nm order combining structural design and automatic balancing, which are usually adopted separately [36][37][38][39][40][41].…”
Section: Helmholtz Cage Air Bearing Sun Simulator True Attitudementioning
confidence: 99%
“…It can be cancelled only partially by design, and manual balancing does not lead to a guaranteed performance level [21]. Several automatic mass balancing systems have been proposed in the literature [28,29,36,37,43,44], as they can largely reduce the time necessary for the platform tuning while ensuring repeatability, and a more effective reduction of the gravity torque. Even so, the stated disturbance limit for testing nanosatellites can hardly be reached: assuming a total rotating mass (platform with balancing mechanism plus CubeSat) in the order of 10 kg, a matching between the CoR and CoM shall be achieved up to 10 nm level, if we want a torque in the order of 10 −6 Nm.…”
Section: Testbed Platform and Automatic Balancing System Designmentioning
confidence: 99%
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