Research Of Multi-Axis Synchronous Motion Control System For Industrial Computed Tomography

With the development of the industrial CT technology and the gradual engineeringapplication fields, requirements for the industrial CT imaging speed and imagingprecision are also getting higher and higher. Meanwhile, the CT system is becomingmore complex and the more complex CT system as well as the increasing number ofmotion multi-axis need a higher level of motion control. As a key part of industrial CTcontrol system, the performance of control system directly affects the imaging accuracyand speed. Now, domestic CT system is restricted by the control mode and hardwarestructure, making it difficult to achieve higher accuracy and faster scan speed inmulti-axis synchronization. Aiming at these problems, the control problem of industrialCT multi-axis synchronous motion will be analyzed and investigated in this paper.This paper firstly presents an analysis of the demand of industrial CT scanningmethod for synchronous motion control. Based on the analysis, some currentlymainstream control technologies, applied in industrial CT are discussed in this paper.Through analysis, this paper propose a control scheme with the Siemens SIMOTIONmotion control system as the core of the industrial CT control technology, and makes adetailed introduction to the SIMOTION motion control system, demonstrating thefeasibility of using SIMOTION synchronous motion function to meet the requirementof industrial CT multi-axis synchronous motion control.By analysis of synchronous movement between the X-ray source and thedetector under DR scanning mode and CT scanning mode with CD-1000CX highenergy X-ray DR and industrial CT detection system, we have completed the softwaredesign of DR scan synchronous motion control in the use of the SIMOTION gearsynchronization.. In the process of synchronous movement to achieve DR scan mode,this paper use the virtual axis control strategy. This strategy is termed as couplingsynchronization control mode，in which the real axis follows virtual axis, i.e. thehierarchical axis of the ray source and the hierarchical axis of the detector to followingthe virtual axis. Results show that, when using virtual spindle synchronization controlstrategy, the maximum displacement of the synchronization error is smaller than theuniaxial following error. On this basis, this paper analysis the three axis synchronousmovements of spiral scan. In the process of synchronous movement to achieve the threeaxis synchronous motion control of spiral scan mode, this paper use the SIMOTION gear synchronous motor function and CAM synchronous motor function of the virtualaxis synchronous control methodIn the debugging test under DR scanning mode with the CD-1000CX high energyindustrial CT detection system as well as practical application in the detection ofrailway castings, a higher control accuracy and smaller following error can been seen.Results show that the SIMOTION control system can not only meet the controlrequirements of multi-axis synchronous motion control of industrial CT systems, butalso obtain high-quality CT scanning image and DR scanning image.