The motivation for this paper arises from the work of Monaghan et al. [13] that considers the possibility of using Computer Algebra tools to improve students' comprehension about real numbers. These authors claim that Computer Algebra helps balance the conceptual/procedural aspects involved in...

The paper deals with the validation of model purposivity in iterative identification and controller design. It is known that when closed loop requirements are too high, the model resulting from the iterative procedure might conflict with the prior knowledge about the process. However, in some...

Every random number generator has its advantages and deficiencies. There are no “safe” generators. The practitioner's problem is how to decide which random number generator will suit his needs best. In this paper, we will discuss criteria for good random number generators: theoretical...

This paper describes a method for modelling nonlinear systems using operating regime decomposition. The resulting model structure is known as a local model network (LMN); it consists in the smoothly-weighted combination of a number of simple local models, each of which is valid in a particular...

The performances of a vector control in the stator fixed frame are studied. This so called cartesian structure is compared with a classical vector control, which uses the flux polar coordinates. This cartesian control avoids the phase determination problem, but needs more complex controllers.

The problem of synthesizing a class of continuous, memoryless feedback controls in order to stabilize a class of imperfectly known homogeneous-in-the-state bilinear time-delay systems is considered. In particular, bilinear systems with state time-delay in the linear term are investigated. The...

A considerable simplification of servo motor manufacturing can be achieved by mounting both the brake and the speed/position sensor (namely resolvers) on the non-drive end side of the motor. But the close vicinity of brake and resolver may lead to serious electromagnetical interference, when the...

The paper describes the motivation of qualitative modelling of dynamical systems, surveys the principal lines of current research in this field and explains the main idea of an automata-theoretic approach, which has been successfully used to solve different problems of supervisory control.

We give the explicit time description of the following problems: dynamics of storage rings, optimal dynamics for some important electromechanical system, Galerkin approximation for beam oscillations in liquid, computations of Melnikov functions for perturbed Hamiltonian systems. All these...

A computer algebra system (Maple) is used for the construction, display, and analysis of residue curve maps. This problem from engineering thermodynamics presents an interesting array of computational problems ranging from symbolic (for deriving the equations), through numerical (solving systems...