@InProceedings{CarraraKuga:2013:EsFrPa,
               author = "Carrara, Valdemir and Kuga, Helio Koiti",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Estimating friction parameters in reaction wheels for attitude 
                         control",
            booktitle = "Proceedings...",
                 year = "2013",
         organization = "International Symposium on Dynamic Problems of Mechanics, 15. 
                         (DINAME).",
                 note = "Setores de Atividade: Outras atividades profissionais, 
                         cient{\'{\i}}ficas e t{\'e}cnicas.",
             keywords = "reaction wheel, least square filter, attitude control.",
             abstract = "The ever-increasing use of artificial satellites in both the study 
                         of terrestrial and space phenomena is demanding a search for 
                         increasingly accurate and reliable pointing systems. Attitude 
                         control systems rely on sensors and actuators that follow these 
                         requirements, but its cost is still high, with little tendency to 
                         fall. It is common nowadays to employ reaction wheels for attitude 
                         control that provide wide range of torque magnitude, high 
                         reliability and little power consumption. The wheels are composed 
                         by a Brushless DC motor (BLDC) whose rotor is attached to a 
                         flywheel. The low torque generated by the motor and the high 
                         inertia causes the wheel to accelerate or decelerate at very low 
                         rates. However, the bearing friction causes the response of wheel 
                         to be non-linear, which may compromise the stability and precision 
                         of the control system as a whole. This work presents a 
                         characterization of a reaction wheel of SunSpace Co., maximum 
                         capacity of 0.65 Nms, in order to estimate their friction 
                         parameters. It used a friction model that takes into account the 
                         Coulomb friction, viscous friction and static friction, according 
                         to Stribeck formulation. The parameters were estimated by means of 
                         a nonlinear batch least squares procedure, from data raised 
                         experimentally. The results have shown wide agreement with the 
                         experimental data, and were also close to a deterministic model, 
                         previously obtained for this wheel. This model was then employed 
                         in a Dynamic Model Compensator (DMC) control, which successfully 
                         reduced the attitude steady state error of an instrumented 
                         one-axis air-bearing table.",
  conference-location = "B{\'u}zios, RJ",
      conference-year = "2013",
                 isbn = "23169567",
                label = "lattes: 0288494962313241 1 CarraraKuga:2013:EsFrPa",
             language = "en",
           targetfile = "DINAME2013-0053.pdf",
                  url = "http://www2.dem.inpe.br/val/publicacoes/DINAME2013-0053.PDF",
        urlaccessdate = "27 abr. 2024"
}