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Abstract

This article concerns cargo pendulation control of an elastic ship-mounted crane using the Maryland Rigging system. The boom luff angle, the length of the upper cable, and the position of its lower suspension point are used as inputs to control the planar vibrations of the elastic boom and the pendulation of the payload. The disturbances acting on the ship are represented by the rolling displacement of the ship due to sea motions and the force acting directly on the payload. The dynamic of the crane is described by a multi-model problem depending on the current values of the cable length and boom luff angle. Accordingly a variable-gain observer and a variable-gain controller are designed. The controller uses the estimated states and the measured roll angle to create the required damping and to compensate for the rolling motion of the ship. Simulation and experimental results showed that the expressed control strategy performs very well and has a significant effect in suppressing the vibrations for different operating conditions and payload masses.

Keywords

Elastic cranes multi-model PI-observer variable-gain controller disturbance compensation

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References

Abdel-Rahman, E. and Nayfeh, A. , 2001, “Feasibility of two-dimensional control for ship-mounted cranes,” in DETC 2001 Proceedings of the ASME Design Engineering Technical Conferences, Pittsburgh, PA, DETC 2001/VIB-21454.

Al-Sweiti, Y. and Söffker, D. , 2005, “Modeling and simulation of an elastic ship-mounted crane,” DETC 2005 ASME 20th Biennial Conference on Mechanical Vibration and Noise (VIB), Long Beach, CA, DETC 2005-84580.

Dadone, P. and Van Landingham, H.F. , 1999, “The use of fuzzy logic for controlling Coulomb friction in crane swing alleviation,” Intelligent Engineering Systems through Artificial Neural Networks 9, 751–756.

Inman, D. , 1989, “Vibration with Control, Measurement, and Stability,” Prentice-Hall International, Mexico, Chapter 7, pp. 141–182.

Kimiaghalam, B. , Homaifar, A. , and Bikdash, M. , 1999, “Pendulation suppression of a shipboard crane using fuzzy controller,” in Proceedings of the American Control Conference, San Diego, CA, Vol. 1, pp. 586–590.

Kimiaghalam, B. , Homaifar, A. , and Bikdash, M. , 2000, “Feedback and feedforward control law for a ship crane with Maryland rigging system,” in Proceedings of the American Control Conference, Chicago, IL, Vol. 2, pp. 1047–1051.

Krajcin, I. and Söffker, D. , 2005, “Advanced model-based disturbance rejection control using proportional-integralobserver,” in DETC 2005 ASME 20th Biennial Conference on Mechanical Vibration and Noise (VIB), Long Beach, CA, DETC 2005-84997.

Meirovitch, L. 1986, “Elements of Vibration Analysis,” 2nd edition, McGraw-Hill, New York, Chapter 8, pp. 300–346.

Söffker, D. , Bajkowski, J. , and Müller, P.C. , 1993, “Detection of cracks in turbo rotors - a new observer based method,” ASME Journal of Dynamic Systems, Measurements and Control 3, 518–524.

10.

Söffker, D. , Yu, T.J. , and Müller, P.C. , 1995, “State estimation of dynamical systems with nonlinearities by using proportional-integral observer,” International Journal of System Science 26(9), 1571–1582.

11.

Yuan, G.H. , Hunt, B.R. , Grebogi, C. , Ott, E. , Yorke, J.A. , and Kostelich, E.J. , 1997, “Design and control of shipboard cranes,” in DETC 97 Proceedings of the ASME Design Engineering Technical Conference, Sacramento, CA, DETC97/VIB-4095.

Planar Cargo Control of Elastic Ship Cranes with the “Maryland Rigging” System

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