Sub-optimal Control Law for Active Magnetic Bearings Suspension

Barbaraci, G.; Virzì Mariotti, G.
January 2012
Journal of Control Engineering & Technology;Jan2012, Vol. 2 Issue 1, p1
Academic Journal
This paper deals with the comparison of three types of sub-optimal control law for the stable levitation of a turbojet shaft, sustained by two radial active magnetic bearings (AMBs). Shaft is considered rigid for the procedure simplification. The utilized approach leads to development of different sub-optimal control laws to use in speed-varying simulations in the angular speed of the shaft. The first control matrix is obtained by explicit relationships of the parameters of the control law vs. speed, obtained using a curve-fitting procedure neglecting the speed-varying elements out of the main diagonal of each single block constituting the entire control matrix. The second control law is obtained by control matrix set to zero angular speed during speed-varying simulations. The third control matrix is obtained by the second neglecting the elements out of main diagonal. Time response to the step input shows difference in performance of the AMBs when varying the control law. All control laws are tested by means of simulation. The study allows showing like a polynomial representation of the control matrix, developed to the variation of angular speed, is able to maintain stable the magnetic levitation.


Related Articles

  • A field-circuit model of the hybrid magnetic bearing. Wajnert, Dawid // Archive of Mechanical Engineering;2019, Vol. 66 Issue 2, p191 

    The paper presents a simulation model of the hybrid magnetic bearing dedicated to simulations of transient state. The proposed field-circuit model is composed of two components. The first part constitutes a set of ordinary differential equations that describes electrical circuits and mechanics....

  • Frequency domain subspace identification with the aid of the w-operator. Yang, Zi-Jiang; Sanada, Shingo // Electrical Engineering in Japan;7/15/2000, Vol. 132 Issue 1, p46 

    Frequency domain subspace identification algorithms have been studied recently by several researchers in the literature, motivated by the significant development of the more popular time domain counterparts. Usually, this class of methods are focused on discrete-time models, since in the case of...

  • Considerations About The Design of Integrated Bearings and Guidance Systems Based On Electromagnetic Levitation. Gligor, Octavian; Popa, Anca Sorana; Argeşanu, Veronica // Mecatronica;2004, Issue 2, p38 

    The present paper emphasizes representative applications with integrated bearings and guidance systems, based on electromagnetic levitation and the advantages these can offer. Main achievements in the field of modern high-speed transportation by implementing these systems are presented....

  • Design, manufacture and evaluation of a new flexible constant velocity mechanism for transmission of power between parallel shafts. Yaghoubi, Majid; Sanaeifar, Alireza // Journal of Mechanical Science & Technology;Aug2015, Vol. 29 Issue 8, p3357 

    This paper presents a new mechanism (coupling) for power transmission between parallel shafts in more ranges. The mechanism consists of one drive shaft and one driven shaft, 3 S-shape transmitter links and 8 connecting links. The advantage of this mechanism is that the velocity ratio between...

  • Traffic analysis of a simplified two-dimensional elevator system. So, Albert; Al-Sharif, Lutfi; Hammoudeh, Ahmad // Building Services Engineering Research & Technology;Sep2015, Vol. 36 Issue 5, p567 

    The idea of multicar operation within one hoistway is not new. Two-car systems are currently available on the market, whereby the two cars travel with restricted independence because one car must always remain above the other. With recent advances in linear machines, systems with more than two...

  • Design and Stress Simulation of Crankshaft for Slider-Crank Drive Stirling Engine. Zainudin, Mohd Farid; Bakar, Rosli Abu; Leong Ming, Gan; Shamshir Ali, anti Zanariah; AnakSup, Billy // Applied Mechanics & Materials;2014, Vol. 699, p678 

    In this present work, the design and simulation of crankshaft for multi-cylinder Stirling engine is studied based on finite element analysis. The proposed crankshaft design is based on the typical crosshead slider-crank mechanism that is being used with the consideration of design needs for...

  • The Manipulability and Optimized Configuration of Tracked Mobile Manipulator. Pengmei Dong; Xinhua Zhao // International Proceedings of Computer Science & Information Tech;2012, Vol. 51, p454 

    Based on the LeoBot-Edu-Sarm tracked mobile manipulator, first build the unified kinematics model of mobile manipulator based on generalized Jacobian matrix, then calculate the mobile manipulator, and analysis its optimized configuration, and make simulations by using Matlab. These all are the...

  • Workspace Representation and Optimization of a Novel Parallel Mechanism with Three-Degrees-of-Freedom. Zhen Gao; Dan Zhang // Sustainability (2071-1050);Nov2011, Vol. 3 Issue 11, p2217 

    The development of a new parallel mechanism based on simulation driven design is a rapid approach to discover the unique features or advantages of a conceptual model. In this research, one novel parallel mechanism which can generate three degrees-of-freedom translations is proposed. The...

  • Sparse factorization of finite element matrices using overlapped localizing solution modes. Choi, J.-S.; Adams, R. J.; Canning, F. X. // Microwave & Optical Technology Letters;Apr2008, Vol. 50 Issue 4, p1050 

    Local-global solution (LOGOS) modes provide a computationally efficient framework for developing fast, direct solution methods for electromagnetic simulations. In this article, we demonstrate that the LOGOS framework yields fast direct solutions for finite element discretizations of the wave...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics