Research on elastic deformation compensation system for three axis air bearing platform

Yang, Qingjun; Zhu, Di; Liu, Changhai; Cheng, Shaoshuai

doi:10.1109/fpm.2015.7337155

Cited by 1 publication

(2 citation statements)

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“…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%

“…The structural deformation of the rotating platform due to its own weight is difficult to compensate, since making a structure stiffer requires more weight, leading to a vicious cycle. As a countermeasure, an active compensation system was proposed in [41]; nevertheless, efficient structural design remains a key approach to the problem, and it is also the one followed for our facility. In summary, platform design must account for two functional subsystems:…”

Section: Testbed Platform and Automatic Balancing System Designmentioning

confidence: 99%

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A Dynamic Testbed for Nanosatellites Attitude Verification

et al. 2020

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To enable a reliable verification of attitude determination and control systems for nanosatellites, the environment of low Earth orbits with almost disturbance-free rotational dynamics must be simulated. This work describes the design solutions adopted for developing a dynamic nanosatellite attitude simulator testbed at the University of Bologna. The facility integrates several subsystems, including: (i) an air-bearing three degree of freedom platform, with automatic balancing system, (ii) a Helmholtz cage for geomagnetic field simulation, (iii) a Sun simulator, and (iv) a metrology vision system for ground-truth attitude generation. Apart from the commercial off-the-shelf Helmholtz cage, the other subsystems required substantial development efforts. The main purpose of this manuscript is to offer some cost-effective solutions for their in-house development, and to show through experimental verification that adequate performances can be achieved. The proposed approach may thus be preferred to the procurement of turn-key solutions, when required by budget constraints. The main outcome of the commissioning phase of the facility are: a residual disturbance torque affecting the air bearing platform of less than 5 × 10 −5 Nm, an attitude determination rms accuracy of the vision system of 10 arcmin, and divergence of the Sun simulator light beam of less than 0.5 • in a 35 cm diameter area.

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