... 06 2008 22 09 2009 04 02 2010 04 02 2010 chaos control nonlinearities linear systems linearisation techniques nonlinear control systems observability oscillations stability state feedback fractional-order controller chaos control output and state feedback...

...Khalid L. Sorensen; Aayush Daftari; William E. Singhose; Keith Hekman Input shaping is a filtering method used for reducing oscillation in flexible systems. A class of these filters, called negative input shapers, has been developed to improve system rise-time beyond what is achievable using...

..., a linear quadratic regulator, that aims to stabilize the pendulum in the upright position. We show that a controller designed using a simple viscous friction model has poor performance—small amplitude oscillations occur when the controller is implemented. We consider various models for stick slip friction...

...Kyong-Soo Kim; Qingze Zou; Chanmin Su In this article, two practical issues encountered in the design and track of scan trajectories are studied: One issue is the large output oscillations occurring during the scanning, and the other one is the effect of modeling errors on trajectory tracking...

...Yong Zhu; Eric J. Barth This paper presents an energetically derived control methodology to specify and regulate the oscillatory motion of a pneumatic hopping robot. An ideal lossless pneumatic actuation system with an inertia is shown to represent an oscillator with a stiffness, and hence...

...Soo Jeon; Masayoshi Tomizuka When a mechanical system with Coulomb friction is under feedback control, the closed-loop system may asymptotically converge to a point in the equilibrium set or generate nonlinear oscillations such as limit cycles depending on the control algorithm. Thus...

...Attir Khalid; John Huey; William Singhose; Jason Lawrence; David Frakes The payload oscillation inherent to all cranes makes it challenging for human operators to manipulate payloads quickly, accurately, and safely. An input-shaping controller was implemented on a large bridge crane at the Georgia...

... in the first part of the motion exactly how to terminate the motion. All results are verified numerically. cranes pendulums oscillations robust control self-adjusting systems adaptive control The gantry crane “problem” for which a solution has been developed is specified as follows...

... around the sliding surface while keeping the boundary layer attractive. Introduction of the boundary layer, however, causes the system response to oscillate around the sliding manifold. These oscillations, in turn, may lead to undesirable tracking errors. In this paper, we propose a quantitative feedback...

... Editor: N. Olgac. 01 May 2002 01 December 2002 04 06 2003 stability delay systems oscillations Parametric Excitation Time Delay Stability Dynamic problems are often composed in the form of differential equations. The qualitative analysis of these differential...

...Anindya Chatterjee; Joseph P. Cusumano We present an observer for parameter estimation in nonlinear oscillating systems (periodic, quasiperiodic or chaotic). The observer requires measurements of generalized displacements. It estimates generalized velocities on a fast time scale and unknown...

... a P-Q relation too close to the required hyperbola. In the dynamic mode of operation, the transient pressure oscillations and settling time are considerably reduced, but the maximum over shoot is increased. Contributed by the Dynamic Systems and Control Division for publication in the JOURNAL...

... injectors in automobile engines. Various types of stability observed are used to design a direct adaptive control of relay type with time delay that extinguishes parasite auto-oscillations in these models. [S0022-0434(00)04004-1] Contributed by the Dynamic Systems and Control Division for publication...