Analyse and Research on Motion Control for Helical CT Scanner

Abstract:

This study mainly focuses on the synchronization problems of whole-body CT scanner. A master-slave synchronous control method is used to achieve synchronism between the gantry rotation motor and the bed moving motor in helical scanning mode, while the cascade control method is used to enhance the stability of each motor. In order to keep synchronous control, a control law is designed by the eigenstructure assignment method, which insures the accuracy of the signal tracking of the periodic load disturbance during the dual-motor synchronous control, and eliminates the adverse effects brought by periodic load. The proposed algorithm is simulated on MATLAB, and compared with the traditional PID algorithm. In addition, the algorithm is implemented on ARM9 and evaluated on a realistic synchronization control experimental platform designed by us. Both the simulation and realistic experimental results indicate that the algorithm is feasible for helical scanning.

• Periodical: Applied Mechanics and Materials (Volumes 687-691)
• Pages: 37-43
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.687-691.37
• Online since: November 2014
• Authors: Gang Yuan*, Yin Zhang, Pin Xu, Zhong Yi Wu
• Keywords: Eigenstructure Assignment, Helical Scanning, Master-Slave Synchronous Control, Motion Control

References

[1] Ge Wang, Hengyong Yu. An outlook on x-ray CT research and development [J] Medical Physics， 2008，35(3)： 1051–1064.

[2] Ming-Chung Fang, Young-Zoung Zhuo, Zi-Yi Lee. The application of the self-tuning neural network PID controller on the ship roll reduction in random waves [J]. Ocean Engineering， 2010，37：529–538A.

DOI: 10.1016/j.oceaneng.2010.02.013

[3] Y Changhua Hu, Guangren Duan . Eigenstructure assignment for linear parameter-varying systems with applications. Mathematical and Computer Modelling. Volume 53, Issues 5–6, March 2011, Pages 861–870.

DOI: 10.1016/j.mcm.2010.10.023

[4] Guilherme Jorge Maeda. A practical control method for precision motion—Improvement of NCTF control[J]．Method for continuous motion control，Precision Engineering 2009，33： 175–186.

DOI: 10.1016/j.precisioneng.2008.05.006

[5] R. Mikalse, E. Jones, A.P. Roskilly. Predictive piston motion control in a free-piston internal combustion engine[J]， Applied Energy2010， 87： 1722–1728.

DOI: 10.1016/j.apenergy.2009.11.005

[6] Song Yi-xu, Wang Chun-hong, Yi Wen-sheng, et al．Adaptive-learning control for permanent-magnet linear synchronous motors[J] ．Proceedings of the CSEE, 2005, 25(20)：151-156.

[7] Tien-Jiun Ren, Tien-Chi Chen, Chun-Jung Chen. Motion control for a two-wheeled vehicle using a self-tuning PID controller[J], Control Engineering Practice 2008, 16 ：365–375.

DOI: 10.1016/j.conengprac.2007.05.007

[8] C. Duval, G. Clerc,Y. Le. Induction machine control using robust eigenstructure assignment. Control Engineering Practice. Volume 14, Issue 1, January 2006, Pages 29–43.

DOI: 10.1016/j.conengprac.2004.12.009