Research On Distributed Servo Control Technology Based On Optical Fiber Bus

The research scope of this paper mainly falls into the field of military control.At present,the MIL-STD-1553 B bus is mainly used for communication between the control system and servo system in the rocket-borne electronic equipment.The transmission rate of the MIL-STD-1553 B bus is 1 Mbps,and each message of the1553 B bus consists of 32 data words.All remote measurement parameters of the servo system are transmitted by a single message between the control system and the servo system controller.In view of the large data volume of information,the control system needs to adapt servo system data to the bottleneck of communication transmission speed by various methods such as configuring speed variable,buffer variable and data truncation.Therefore,the use of fiber channel protocol in servo system can meet the communication requirements of the future rocket-borne equipment.At present,the protocol has become a globally recognized standard for the selection of the second generation military bus,and it is widely used in avionics system,and it has been studied and demonstrated in the existing literatures in aerospace control system.First,the application of electromechanical servo technology and fiber channel at home and abroad are surveyed in this paper.Then,it is determined to apply optical fiber bus as the secondary bus channel,build a distributed servo control architecture,and customize the servo system design for the optical fiber communication protocol according to the current situation that 1553 B bus is widely used.By comparing the three topologies of fiber channel,it is determined to use the arbitrated loop topology to research and verify this project.In consideration of the advantages and disadvantages of FPGA and DSP,the DSP+FPGA mode is used for the hardware scheme of the system.As for the determined system architecture,the optical fiber bus communication model is designed first,and then the overall hardware scheme of servo controller is designed;second,the design of DSP software is described;third,the data bus,high-speed transceiver interface model and communication function are designed and simulated respectively;at last,in the verification stage,after the feasible conclusion is obtained through the hardware-in-the-loop simulation,the integrated system of “optics,mechanics and electronics” is subjected to joint debugging and verification,as well as the experimental verification by two servo mechanisms of a certain type.The test diagram of position characteristics of the servo mechanism indicates that the optical fiber bus system designed in this paper is accurate and effective in data transmission.