| Maglev rail transit has outstanding advantages such as good ride comfort,high safety and low noise.It can be used as a point-to-point transportation method between cities to supplement the high-speed rail and intercity rail transportation network system.However,with the increasing improvement of people’s living standards,further requirements are put forward for the economy,energy saving and noise reduction of the rail transit manufacturing system.At present,lightweight and low energy consumption design has become an important research direction for rail transit.This thesis mainly takes the suspended mid-mounted double-suspension maglev vehicle(hereinafter referred to as the light maglev vehicle)as the research object.The light maglev vehicle adopts the permanent magnet-electromagnetic hybrid suspension system,the vehicle body is supported by a four-point force element through the arrangement of the secondary suspension in the middle.The analysis and simulation research on the hybrid suspension magnetic-rail relationship,vehicle-track-bridge coupling effect,vehicle running stability and stability,etc.are carried out.The research results are expected to provide reference for the design and engineering application of the hybrid suspension system maglev transportation.This thesis mainly carries out the following aspects of work:Based on the research results of the structure of the permanent magnet-electromagnetic hybrid levitation electromagnet,its working principle is expounded,and the state feedback control model of the hybrid electromagnetic levitation is established.A complete permanent magnet-electromagnetic hybrid suspension light-weight maglev vehicle-track-bridge coupling dynamics model is established,and on this basis,the simulation research on the interaction of maglev vehicle-track-bridge is carried out.The simulation analysis shows that the light-duty maglev vehicle has excellent running stability,the fluctuation amplitude of the suspension gap meets the limit requirements,and the suspension force provided by the hybrid suspension electromagnet is sufficient to provide the suspension force required by the light-duty maglev vehicle during operation.Track-bridge vertical deflection can also meet the technical requirements of track beams.For the research on the influence of parameters of light maglev vehicles,this thesis compares and analyzes the dynamic response of pure electromagnetic and permanent magnetelectromagnetic hybrid suspension modes,and verifies the energy saving of the hybrid electromagnetic suspension system;At the same time,the dynamic response amplitude of the light maglev vehicle-track-bridge coupling under different operating speeds and different secondary suspension vertical stiffnesses is simulated and analyzed.The results show that the light maglev vehicle has good dynamic performance within the range of lower than the maximum design speed.The vertical stiffness of the secondary suspension mainly has a great influence on the vehicle running stability index.In addition,the influence of the arrangement of the drawbar,the wavelength and amplitude of different track irregularities on the running performance of the light-duty maglev vehicle is analyzed,and the calculation results can provide a reference for the design of the light-duty maglev vehicle and the practical engineering application of the line.In the end,this thesis discusses and analyzes the dynamic response of light maglev vehicles under complex conditions such as fault conditions,crosswind conditions and combined conditions.The results show that under complex working conditions,the light maglev vehicle can maintain stable operation within a certain operating speed.To sum up,this thesis has carried out a systematic study on the coupling dynamic effect of the magnetic levitation vehicle-track-bridge in the permanent magnet-electromagnetic hybrid suspension system.The research results have engineering application value for the development of economical,energy-saving and environmentally friendly rail transit systems. |
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