The magnetic suspension and balance system for the θ85 mm suction-type supersonic wind tunnel at Tohoku University, which is capable of magnetically suspending the model against the starting and stopping loads without mechanical support, has been successfully developed. To implement fast control system response, a new optical position sensor was built and calibrated. The 1.24 kHz synchronous control system, composed of a proportionalintegral controller plus a double-phase advancer, made the rise time of a step response 30% faster than the Japan Aerospace Exploration Agencyfs existing magnetic suspension and balance system. The frequency characteristics of the magnetic field intensity formed in the test section were measured and improved to achieve faster performance of the control system. The control simulation of the magnetic suspension and balance system for the θ85 mm suctiontype supersonic wind tunnel at Tohoku University indicated the appropriate conditions, such as increasing the moment of inertia of the model and setting a cutoff frequency of 100 Hz, and led to successful magnetic suspension tests.
ASJC Scopus subject areas
- Aerospace Engineering