Overlap Structure Of Normal Conducting High-speed Maglev Train Suspension Control Technology

Suspension control of the join-structure is one of the keystone of High-Speed Maglev Train suspension technology. Although the join-structure increases the redundancy ability and enhances the security when Maglev Train runs at high speed, the two suspension points on the same join-structure coupled closely. It is difficult to ensure the steady suspension of the join-structure if the control method of the two suspension points is designed independently, so the coupling force between the two points must be taken into account. In this dissertation, the model of the join-structure is built. The model is decoupled and linearized by differential geometry method. The join-structure is decoupled to two unattached subsystems. Then the method of the state feedback is used to design the control method for the two subsystems respectively. The simulation result shows that the control method can ensure the steady suspension of the join-structure.Contraposing the complexity of the arithmetic about signal processing and suspension control, the dissertation brought forward an idea of the double DSP parallel processing. When the join-structure is suspended, suspension state message between the two suspension points should be exchanged and the digital suspension controller will communicate with the sensor. This function is realized by RS-485 serial communication. The dissertation build the double DSP digital suspension controller platform based on RS-485 serial communication, which provides a well foundation for the suspension control experiment of the join-structure. The stability influence produced by serial communication is analyzed theoretically, which is about one point of the join-structure. The delay range arisen by serial communication in which the system is steady is figured out. The delay of the system is in the range, so the older control parameter can make the system steady. The conclusion could provide the reference for choosing the baud rate of serial communication for the join-structure.Finally, the experiment is done on a simple join-structure. The experiment result shows that the control method designed in the dissertation can ensure the steady suspension of the join-structure. When there is something wrong with one suspension point on a join-structure, the variation of suspension clearance of the other is only about 0.8mm . It manifests that this method can achieve the join-structure's redundancy function.