In this paper, we approach the problem of determining the basic components from repetitive textured surfaces undergoing free-form deformations. Traditional methods for texture modeling are usually based on measurements performed on fronto-parallel planar surfaces. Recently, affine invariant descriptors have been proposed as an effective way to extract local information from non-planar texture s...

In this paper we propose an optimal control design technique for a class of nonlinear and control non-affine equations. The dynamic equations of a flexible shaft supported by a pair of active magnetic bearings (AMBs) are used as the nonlinear control nonaffine equations. The basic model of the system will be a Timoshenko beam supported at the ends by magnetic frictionless bearings. The effectiv...

Radhakant Padhi , Nishant Unnikrishnan , S. N. Balakrishnan 3 Department of Aerospace Engineering, Indian Institute of Science – Bangalore, India Department of Mechanical and Aerospace Engineering, University of Missouri – Rolla, USA Abstract This paper proposes a new model-following adaptive control design technique for a class of non-affine and nonsquare nonlinear systems using neural network...

In this paper, the effects of nonsingular affine transforms on various nonlinear network training algorithms are analyzed. It is shown that gradient related methods, are quite sensitive to an input affine transform, while Newton related methods are invariant. These results give a connection between pre-processing techniques and weight initialization methods. They also explain the advantages of ...

This paper presents a novel Adaptive Fuzzy Sliding Mode Controller (AFSMC) for a model-scaled unmanned helicopter as real nonlinear plant. First, in order to efficient control law design, the nonlinear model of the helicopter is reformulated as an affine nonlinear system. To do this aim, a Dynamic Inverter (DI) is introduced as a bijective function. The proposed DI is used to interconnect the h...

This article considers the asymptotic tracking control problem for a class of nonlinear systems subject to predefined constraints system response, such as maximum overshoot or minimum convergence rate. In particular, by employing discontinuous protocols and nonsmooth analysis, we extend previous results on funnel guarantee at same time trajectory tracking. We consider second-order that are affi...