author = "Oliveira, Alexandre Macedo de and Kuga, H{\'e}lio Koiti and 
                         Carrara, Valdemir",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Air bearing platforms for simulation of spacecraft attitude 
                         control systems",
            booktitle = "Proceedings...",
                 year = "2015",
               editor = "Steffen Junior, V. and Rade, D. A. and Bessa, W. M.",
         organization = "International Symposium on Dynamic Problems of Mechanics, 17.",
            publisher = "ABCM",
             keywords = "air bearing, attitude control, satellite simulator, Kalman filter, 
                         inertial systems.",
             abstract = "This paper presents the development of two different air bearing 
                         tables, which can simulate attitude control systems for satellites 
                         with hardware-in-the-loop dynamics and control. Both systems are 
                         based on gas-bearing platforms in which several sensors and 
                         actuators were fixed. The first platform has a MEMS inertial 
                         sensor, and the second platform has several sensors and actuators 
                         that are engineering models similar to those usually employed in 
                         satellites. A PC/104 computer commands the first platform, which 
                         is responsible for driving 8 cold gas thrusters. On the other 
                         hand, the second platform is based on a Renesas 32 bits processor, 
                         which is responsible for three different subsystems: power supply, 
                         data handling and attitude control. The actuators in this case are 
                         reaction wheels and magnetic torque coils. The most important 
                         process for the correct operation of the simulators is to ensure 
                         accurate balancing of both platforms, because a difference between 
                         the center of gravity of the platform and the center of rotation 
                         of the bearing support may generate higher torques than those 
                         normally encountered in the space environment, invalidating the 
                         main feature of the simulator. Therefore, we use non-linear 
                         filtering to obtain the platforms mass properties, including the 
                         center of gravity position. Finally, we validate the mass 
                         properties by implementing two simple attitude stabilization 
                         controllers. Considerations on the nature of the friction of the 
                         two platforms will also be made in the end of this paper.",
  conference-location = "Natal, RN",
      conference-year = "22-27 Feb.",
             language = "en",
           targetfile = "oliveira_air.PDF",
        urlaccessdate = "04 dez. 2020"