Development Of Rotating Parts Of Magnetic Levitation Free-to-roll Device

In the research and development of aircraft.The aircraft model is often placed in the wind tunnel.The real flight is simulated by adjusting the air velocity and flow direction to evaluate the aerodynamic characteristics and attitude stability of the aircraft.Thereby effectively shortening the development cycle of the aircraft.However,in the existing Free-to-roll support device.The rotating shaft is generally supported by a mechanical bearing.And the rotating shaft is subject to large friction during the rotation process,which cannot simulate the real stress state of the aircraft during flight.Therefore,the magnetic suspension bearing is applied to the Free-to-roll device to improve the accuracy and reliability of the wind tunnel test.The thesis is developed around the working principle and design index of the rotating parts of the magnetic levitation Free-to-roll device.The specific contents are as follows:1.According to the design index of the Free-to-roll device,the necessity and feasibility of applying the magnetic suspension bearing system to the Free-to-roll device are expounded.The overall structure design of the magnetic suspension Free-to-roll device is carried out,including the selection,structural arrangement and detailed structural parameters are designed and calculated.The material selection,strength calculation and mechanical performance analysis of the rotating shaft are carried out.Finally,the electromagnetic brake of the device is designed.2.The finite element analysis of the electromagnetic field is carried out for the designed magnetic suspension bearing.The magnetic induction intensity,magnetic induction line distribution and electromagnetic force are analyzed for the radial magnetic suspension bearing and the improved axial magnetic suspension bearing respectively.The results prove that the radial magnetic suspension bearing in the installation scheme meets the design requirements and the effectiveness of the axial magnetic suspension bearing structure design.The mechanical properties of the thrust plate of the axial magnetic suspension bearing are analyzed,and it is proved that its strength,rigidity and structural form can meet the design requirements.3.The single-degree-of-freedom linearization mathematical model of the magnetic suspension bearing is established.The standard PID controller is designed and its parameters are tuned.For the standard PID controller can not self-tune the parameters and can not meet the requirements of the Free-to-roll device operating conditions.The fuzzy self-tuning PID control system of magnetic suspension bearing is designed.The simulation research of standard PID control system and fuzzy PID control system is carried out under the Simulink environment of MATLAB,and the better control system response is obtained.4.The composition of the control system of the magnetic levitation free-to-roll device is introduced.The controller hardware is debugged.The bearing capacity of the magnetic suspension bearing is measured.The position of the eddy current sensor is calibrated,and the static suspension debugging of the Free-to-roll device is carried out.The angle data acquisition hardware and the system host computer software are built.The reading of the angle of the rotating shaft is realized,and the rolling resistance test is completed.