一种六自由度动态线驱动坐标架及应用
A novel support mechanism for a wind tunnel model is designed, built, and demonstratedon an aerodynamic platform undergoing dynamic maneuvers, tested with periodic motions up to20 Hz. The platform is supported by a 6-DOF (six degrees of freedom) traverse that utilizes eightthin wires, each mounted to a servo motor with an in-line load cell to accurately monitor or controlthe platform motion and force responses. The system is designed such that simultaneous control ofthe servo motors effects motion within 50 mm translations, 15 pitch, 9 yaw, and 8 roll atlower frequencies. The traverse tracks a desired trajectory and resolves the induced forces on theplatform at 1 kHz. The effected motion of the platform is measured at 0.6 kHz with a motion capturesystem, which utilizes six near-infrared (NIR) cameras for full spatial and temporal resolution of theplatform motion, which is used for feedback control. The traverse allows different platform modelgeometries to be tested, and the present work demonstrates its capabilities on an axisymmetric bluffbody. Programmable timed outputs are synchronized relative to the model motion and can be usedfor triggering external systems and processes. In the present study, particle image velocimetry (PIV)is used to characterize the realized wakes of the platform undergoing canonical motions that areeffected by this new wind tunnel traverse.