Print Email Facebook Twitter Experimental and system study of Reaction Wheels. Part I: Measurement and statistical analysis of force and torque irregularities Title Experimental and system study of Reaction Wheels. Part I: Measurement and statistical analysis of force and torque irregularities Author Prins, J.J.M. Institution National Aerospace Laboratory NLR Date 1982-02-01 Abstract Torque and force irregularities of running reaction wheels were studied. In this first part of the study report results from noise measurements at constant wheel speeds on various types of current technology European reaction wheels, both with ball- and magnet bearings and with DC or AC drive motor, are presented. The measured noise in radial and axial force and in torque about the rotation axis at constant wheel speeds was statistically analysed and presented as spectral plots. Differences in noise characteristics between the irarious wheel types are indicated. As shown the larger part of the noise is wheel speed dependent, both in frequency and power. Major noise causes are DC motor commutation and ball bearing retainer movements. Subject Reaction wheelsFeedback controlKalman filtersVelocity controlSatellite attitude controlDynamometersTorque metersTest equipmentPerformance testsBall bearingsMagnetic suspensionSpectrtim analysisTransfer functionsTorquemotorsServomotorsFrequency analyzersResonant frequenciesVibrational spectraTorqueNoise measurementsData acquisition To reference this document use: http://resolver.tudelft.nl/uuid:e9db9586-07f5-48a2-8d6a-1c9c7c4f5118 Publisher Nationaal Lucht- en Ruimtevaartlaboratorium Access restriction Campus only Source NLR-TR 82003 U Part 1 Part of collection Aerospace Engineering Reports Document type report Rights c)1981 National Aerospace Laboratory NLR Files campus only