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In this paper we propose a couple of fractional order observers for nonlinear commensurate fractional order systems i.e. a reduced order observer and a fractional Luenberger observer in the algebraic and differential setting. We introduce the Fractional Algebraic Observability (FAO) property, like a measurement degree of fractional observability of states variables. Finally a comparison between two...
Multiphase induction motor (MIM) drives are becoming popular for high-power applications because of fault tolerant capability and wide range speed-torque characteristics. Using pole-phase modulation (PPM) technique, it is able to give high-torque for faster acceleration as well as high speed during steady operation. To achieve both these features, the MIM drive requires higher number of stator slots...
The objective in this paper is the introduction of a new method in the design of high voltage insulators by exploiting a meta-heuristic optimization. Indeed, a neural network is used for the prediction of the value of the tangential electric field at the high voltage pin (the area where the value of the electric field is maximum), which will then serve as an objective function to be minimized by the...
Based on nano two-phase composite magnetic material, a design and optimization scheme of energy-saving wind power grid contactor is proposed, which solves the problems of traditional contactor's high iron loss, low speed and large AC noise. In this paper, the electromagnetic system of the contactor is redesigned by the characteristics of high remanence, high coercivity and wide hysteresis loop of...
The main goal of this paper is to develop with partial differential equation 3D toolbox under Matlab environment a “FEM3DPIE” calculating code to study and analysis the piezoelectric phenomena of beam bending actuator in harmonic mode. First, all the equations of the mathematical formulation of the piezoelectric coupling effect are detailed, then the numerical solution based on the Finite Element...
This paper describes the procedure for measurement of the rotational core losses in electrical machines with an experimental setup made from a modified induction machine stator that is turned into round rotational single sheet tester. The differences between the similar apparatus and the problems caused by the specimen shapes and power supply harmonics are presented. For the verification of measurements,...
Many real dynamical processes in control engineering practice can be modelled as a first order plant with saturation at its input. This paper proposes a new solution to control such plants, which is a combination of discrete-time first-order sliding mode (SM) control and discrete-time realization of super twisting control algorithm (STA) that is commonly used in second-order SM. A brief mathematical...
The paper presents the analysis of the performances of an Outer Rotor Synchronous Reluctance Machine as potential candidate for direct-driven low speed industrial application. The influence of slot/pole combination, as well as the number of flux-barriers was investigated in order to arrive to a topology suitable for the targeted application. The proposed machine has the highest average torque and...
Based on the fact that the three-phase induction machine proves higher performance under six-phase supply, which was demonstrated in Part 1 of the paper, this work investigates the fault-tolerance capability of the six-phase structure with asymmetrical configuration (30° phase shifting both for space and time conditions). It is taken into discussion the cut-off of one, two and three phases respectively...
A comparative study of a 5 phase PMSG with classical distributed winding and one with fractional slot winding is presented in this paper. Finite element analysis has been used for both models in order to estimate there performances. Two initial conditions have been considered: keeping the same volume of permanent magnet and the same total slots section for stator winding. The main goal was to design...
In this paper a new mathematical model of Single-Phase Flux Reversal motor (FRM) steady-state modes applicable for its optimal design is described. A new embodiment of FRM designed for fan or pump applications is proposed. Efficiency and energy efficiency class of FRM is higher than of an interior permanent-magnet motor. At power less than rated power the efficiency difference becomes greater which...
Multi-degree of freedom manipulators have become a hotspot in the field of robotics because of many advantages. In this paper, a 5-DOF manipulator was taken as the object of study. The modal analysis on it was carried out by methods of test and finite element analysis. A model updating method based on sensitivity analysis was put forward, and the final finite element model was established by iterative...
The dynamic response analysis to simulate the complicated working condition can ensure the high reliability of space products' design. In this paper, we focus on the solar array of a satellite, and gain equivalent mechanical parameters of its internal honeycomb panel's construction. We build an accurate finite element model, and perform modal analysis and frequency response analysis as well. By contrast,...
The paper presents the validation of the implementation made by the user of the standard wall function for the standard k-ε turbulence model against the built-in standard wall function for the standard k-ε turbulence mode, in numerical computation software (ANSYS Fluent). A comparison was made between the results of two flow simulations: the first case consisted in using the built-in standard wall...
Torque ripple presents the main disadvantage of switched reluctance motor. Advanced control methods allow to minimize the torque ripple, which requires knowing the motor parameters — inductance and torque characteristics. The paper presents parameter identification of switched reluctance motor with 2p1/2p2 = 12/8 number of poles. Included in this document are results of inductance and torque measurements...
This paper considers a method for detecting faulty elements in a linear phased array by means of set near-field probes. Using the asymptotic correspondence for two- and three-dimensional problems of the antenna theory leads to simpler mathematical models for the vertical dipoles array. A numerical study of mathematical models is based on the iterative regularization of the ill-posed problem of reconstructing...
In this work the Interpolating Element-Free Galerkin Method is used to investigate electrostatic grounding problems. A new proposal, using injection of current, to excite the problem is presented. A vertical electrode introduced in homogeneous and non-homogeneous soils is considered as case of study in order to determinate the grounding resistance and the electrical potential distribution along the...
Some optimum regime of the information receipt is found in the non — antagonistic repeated game of two players. The set of choices of the second player is changed in time according to one of some variants. The variants of change are known till the beginning of the game. There is a finite number of variants. The income during the game information permits to ascertain the true variant.
Fully three-dimensional wavefront matching method for waveguide discontinuity problem is newly developed. In principle, the developed method can be applied to optimize any geometries including reflection. The application for Si mode converters (TE0-TE1, and TE0-TE2) are demonstrated and ultrasmall structure with low-loss is obtained.
Modeling the lightning attachment process is required on any method to design the air-termination elements of a lightning protection system. An attachment model that adopts the leader progression concept is used to evaluate the three-dimensional attractive zone of a lightning rod on a common 54-m tall building in Sao Paulo, Brazil. Electric field and scalar potential distributions are calculated numerically...
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