Virtual engineering utilizes various computer–based simulation techniques for the analysis of complex systems such as mechanical structures, environmental systems, production processes, and even whole production plants. One main goal of virtual engineering is to find the optimum for mechanical structures, facilities, or production processes in terms of cost, time, energy consumption etc. Hence,...

This paper addresses the problem of obtaining models of nonlinear mechanisms for use in virtual prototyping systems. The objective of the described modeling procedure is to more accurately represent the feel of complex mechanisms in force feedback applications. The model structure selected for this study is a 2-order impedance model, with mass, damping, stiffness, and coulomb friction that vary...

The dynamics of beams that undergo large displacements is analyzed in frequency domain and comparisons between models derived by isogeometric analysis and p-FEM are presented. The equation of motion is derived by the principle of virtual work, assuming Timoshenko’s theory for bending and geometrical type of nonlinearity. As a result, a nonlinear system of second order ordinary differential equa...

This paper addresses the adaptive asymptotic tracking control problem for nonlinear systems whose virtual gains are unknown functions of system states. Only in first step, Nussbaum gain technique is utilized to handle uncertain gain. In remaining steps, dealt with by constructing novel laws without approximation and external disturbances neural networks or fuzzy logic. New defined compensate ga...

In this paper, an on-line fault tolerant approach for networked control systems is proposed. The fault tolerant approach incorporates a fault detection and diagnosis methodology based on on-line identification of an ARX model and on neural nonlinear principal components analysis, as well as on neural nonlinear discriminant analysis. When a fault is correctly diagnosed the supervision system rec...

A method is described for set-point tracking in nonlinear systems when pointwise-in-time input and/or state inequality constraints are to be enforced. It consists of adding to a primal compensated system a nonlinear device called command governor (CG) whose action is based on the current state, set-point and prescribed constraints. The CG selects at any time the system input via a receding-hori...

This article presents a methodology to extract principal components of large set of data, considering the existence of possible nonlinear relations among them, called C-NLPCA (Cascaded nonlinear principal component analysis), and evaluates its use in the extraction of main human movements in image series, aiming for the development of methodologies and techniques for skill transfer from humans ...