Forthcoming articles

International Journal of Digital Signals and Smart Systems

International Journal of Digital Signals and Smart Systems (IJDSSS)

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International Journal of Digital Signals and Smart Systems (11 papers in press)

Regular Issues

  • Modern explanation of the proton radius puzzle, an extension of the Standard Model: muonic radiuses ????????(????????) , ????????(????????) and ????????(????????) are novel physical constants   Order a copy of this article
    by Jamil KOOLI 
    Abstract: The polemic on muonic measurements is continuing for a decade. So far, the proton radius puzzle remains entire. In fact, there is a general tendency of experimenters and theorists, according to which an absolute solution of the problem is beyond the Standard Model. The main object of this paper is to demonstrate the existing of real fundamental links between the constants of muonic and electronic hydrogen and deuterium, which could confirm the muonic radiuses as new fundamental physical constants, which also could provide the first muonic constants of a novel physics incorporating the exotic atoms. We determined an absolute expression for the deuteron radius, ???? ????, from electronic deuterium, and another absolute expression for the muonic deuteron radius, ???????? ???????? , from muonic deuterium. We established a close relationship between the electronic radius ???????? and the muonic radiuses, ???????? ???????? , ???????? ???????? (R. Pohl et al., 2016), and ???????? ???????? . For our calculations, we utilized the most precise experimental data of Randolf Pohls team. We obtain (1) ???????? ???????? ?2.12852(78) fm, (2) ?????????0.87564(61) ????????, (3) ???????? ???????? ?0.83580(20) fm, (4) electronic (????????2 ? ????????2) ? 3.81928(35) ???????? 2, all linked to (5) ?????????2.1415(45)fm (R. Pohl et al.,), and (6) ????????(????????)? 0.8409(4) fm (Pohl R., Mainz, 2 June 2014). We reserve the sign equal (=) only for absolute physical constants
    Keywords: proton radius puzzle; electronic deuteron radius; electronic proton radius; muonic radiuses; Standard Model; novel physics; fundamental links.

  • Delay-dependent robust optimal H-infinity control for uncertain 2-D discrete systems described by the general model with both state and input delays   Order a copy of this article
    by Arun Kumar Singh 
    Abstract: This paper presents the problem of delay-dependent robust optimal H-infinity control for a class of uncertain two-dimensional (2-D) discrete systems described by the general model (GM) with both state and input delays. The parameter uncertainties are assumed to be norm-bounded. Based on a summation inequality, a linear matrix inequality (LMI)-based sufficient condition for the existence of gamma-suboptimal state feedback H-infinity controllers is established. Furthermore, a convex optimization problem with LMI constraints is formulated to design a delay-dependent optimal state feedback H-infinity controller which minimizes the H-infinity noise attenuation gamma of the closed-loop system. Finally, an illustrative example is given to demonstrate the effectiveness of the proposed method.
    Keywords: General model; H-infinity control; input delays; linear matrix inequality; state delays; uncertain systems.

  • The proton radius puzzle: an absolute expression emerges for the muonic proton - neutron radius ratio   Order a copy of this article
    by KOOLI Jamil 
    Abstract: In the present paper we are continuing to confirm how the muonic radiuses are closely linked to the classical constants. Our previous work (Jamil Kooli, 2020) describes the fundamental links between the electronic proton, the deuteron, the muonic deuteron, and the two protons from muonic hydrogen and deuterium. Here our new relationship leads to an absolute definition for the Bohr radius. It links the absolute values of the Bohr radius, the proton charge radius from muonic hydrogen, and the neutron radius. The numerical applications using the CODATA-2018 Bohr radius value give preliminary values. We obtain, (1) r_(p(?p))/r_n ?0.95827(16); (2) r_n? 0.87752(12) fm; and (3) r_p/r_n ?0.997826(25). These calculations have been effectuated using the value? r?_(p(?p))? 0.8409(4) fm (Pohl R., Mainz, 2 June 2014). But they are preliminary because we do not exclude that the absolute value of the Bohr radius could be inferior to the Bohr radius value derived from the classical definition. Moreover such absolute Bohr radius could exceed the Bohr model because its calculation could relate directly with the calculating constants of physics, which are dimensionless constants and unknown yet. This concerns notably the determination of the absolute value of our ratio r_(p(?p))/r_n . The absolute Bohr radius seems then as enigmatic as the fine structure absolute value. We reserve the sign equal (=) only for the absolute values of the constants.
    Keywords: Bohr radius; neutron radius; proton radius puzzle; “muonic radiuses”; electronic proton charge radius; exotic atoms.

  • Design and 3D FEA based investigation of performances of a New Claw-pole TFPM Topology   Order a copy of this article
    by Anis Njeh, Hafedh Trabelsi 
    Abstract: This paper present a new configuration of claw-pole transverse flux permanent magnet synchronous machine (TFPM), this machine is characterized by a discoid rotor and a stator which contains claw-shaped teeth allowing conduction of the flux in the axial direction into the stator. The machine offers the advantage of having a smaller machine volume and to operate with a same rotor disc for two stator phases, unlike existing claw pole machines. The machine combines the advantages of Transverse flux Synchronous Machines (TFPM) and the Axial Flux Synchronous Machine (AFPM). The claw-pole TFPM machine with discoid rotor and axial air gap has a higher electric and magnetic loading which leads to the very high torque density of the new TFPM compared to AFPMs, the structure of the presented machine with an inserted winding between the stator inner and outer parts, instead of distributed or fractional-slot ones, this eliminates the end-windings found in the AFPMs, which minimize the copper losses. A specific sizing of the stator teethes is required for this design where the dimensions depend on the used length of the overlap between teethes. This configuration of clawpole TFPM gives the advantage of a smaller machine with a shorter length in the axial direction and can be mounted directly in vehicle wheels. For Performance analysis and comparison to the cylindrical rotor machine, this work present a study based on 3D Finite Element Analysis (FEA) of the output torque and the cogging torque of the proposed new design of claw pole TFPM for the single-phase and two-phase machine.
    Keywords: New design; Claw pole TFPM; discoid rotor; FEA; performance.

  • Robust filtering for state and fault estimation of linear stochastic systems   Order a copy of this article
    by Gannouni Faten 
    Abstract: The problem of simultaneous robust fault and state estimation for linear discrete-time systems with bounded uncertainty is investigated in this paper. To solve this problem, a design approach to the robust proportional integral filter (RPIF) is developed. Based on the robust least-square estimation method, new robust filters (RPIF) guaranteeing an optimized upper bound for any allowed uncertainty is proposed to estimate both the unknown faults and the state. The unknown additive fault affects both the state and the output equations without any prior information about his dynamical evolution. . In this study, the global minimization of the state error covariance matrix is converted into a convex optimization problem subject to linear matrix inequality. The effectiveness of the proposed results are demonstrated through an illustrative example that gives a robust simultaneous fault and state estimation for linear uncertain systems.
    Keywords: Uncertain discrete-time systems; parameter uncertainty; Robust filtering; Least-squares; Convex optimization.

Special Issue on: IMAT3E'18 Advanced Technologies in Energy and Electrical Engineering

  • T-S fuzzy observers design and actuator fault tolerant control applied to vehicle lateral dynamics   Order a copy of this article
    by Naoufal El Youssfi, Rachid El Bachtiri, Hicham El Aiss 
    Abstract: In this study, we present a method for estimating actuator faults along with a technique of fault-tolerant control (FTC) based on fuzzy observers for continuous Takagi-Sugeno (T-S) fuzzy models, which are affected by modelling disturbances and actuator faults. The stability analysis is based on the quadratic function of Lyapunov and resolving a convex set of linear matrix inequalities (LMIs). The purpose is to ensure the asymptotic stability of the system states and to compensate for the impact of disturbances and actuator faults. Ultimately, numerical simulations on the vehicle lateral dynamics model exemplify the efficiency of the proposed control and the fuzzy observers' design procedure.
    Keywords: fault-tolerant control; FTC; vehicle lateral dynamics; linear matrix inequality; LMI; fault estimation; T-S fuzzy models.
    DOI: 10.1504/IJDSSS.2020.10032267
  • Solar integrated combined cooling-power generation systems for waste heat recovery using different energy efficient materials   Order a copy of this article
    by Kaushalendra Kumar Dubey, R.S. Mishra 
    Abstract: The prominent issues of energy crisis and environment toxicity are disused in these days globally. The CO2 concentration in atmosphere and depletion of conventional fuels can be control by the implementation of eco-friendly and energy efficient material-based cooling systems for heat recovery. The uncovered heat in terms of waste heat from different industrial process of power generation plant, iron industry, refineries, etc., is capable of producing combine generation of power-heating and cooling. This paper conducts the theoretical analysis of solar thermal energy operated vapour adsorption and steam jet cooling system for heat recovery of different capacity of power generation system. The result of present work summarise the efficient cooling effect with minimum high grade energy consumption. The integration of solar parabolic trough collector-based water heating unit helps to increase the desorber temperature and further improvement in refrigerator performance with the utilisation of alternative refrigerant material and achieve the de-carbonise infrastructure for massive industry.
    Keywords: global warming potential; ozone depletion; eco-friendly refrigerants; solar thermal renewable energy system.
    DOI: 10.1504/IJDSSS.2021.10036180
  • Robust integral sliding mode controller design of a bidirectional DC charger in PV-EV charging station   Order a copy of this article
    by Youssef Cheddadi, Zakariae El Idrissi, Fatima Errahimi, Najia Es-sbai 
    Abstract: The charging infrastructure is developed and extended simultaneously with the considerable growing of electric vehicle fleet. In this paper, the problem of controlling an energy storage unit used in the photovoltaic charging station for electric vehicles is considered. The purpose is to design a robust control of a bidirectional DC-DC converter in order to ensure a perfect tracking of the battery current to its reference, and an asymptotic stability of the closed-loop system. For this reason, a robust integral sliding mode control is designed to regulate the current considering the output voltage of DC bus is regulated. The vehicle to grid concept is guaranteed using the bidirectional converter that interface between the energy storage unit and the EV battery. The formal analysis and simulation results are shown that the designed integral sliding mode controller was found to be robust and stable without steady-state errors, which matches all the objectives.
    Keywords: PV charging station; bidirectional DC-DC converter; integral sliding mode control; ISMC; current control; electric vehicle.
    DOI: 10.1504/IJDSSS.2021.10036181
  • A summary study on handwritten documents' word spotting   Order a copy of this article
    by Manal Boualam, Youssef Elfakir, Ghizlane Khaissidi, Mostafa Mrabti 
    Abstract: The researchers have focused on the techniques used to create systems for data protection such as signature verification, investigation in crimes, handwriting mails, graphical documents analysing, human assisting, etc. Recently, several researchers have focused on creating an optimal system for data processing in handwriting documents. This paper aims to present an overview about the studies and techniques used to achieve this system. The paper presents at first the most used databases, then a general pipeline diagram for word spotting system, next in each step (pre-processing, segmentation, feature extraction and classification) the most used techniques/methods and a summary table about the published researches are presented and finally the latest studies in this field.
    Keywords: handwritten; automatic research; features extraction; classification; word spotting.
    DOI: 10.1504/IJDSSS.2020.10033111
  • Numerical approach for parameter extraction of a photovoltaic module based on datasheet and five parameters model   Order a copy of this article
    by Fatima Cheddadi, Youssef Cheddadi, Fatima Errahimi, Ahmed Gaga 
    Abstract: The information provided by the constructors is not sufficient for modelling PV panels, where there is a need to determine the unknown parameters to predict the performances and to facilitate a better understanding of the behaviour of a PV generator under the climatic conditions variation. This work presents a numerical method for determining the unknown parameters of a photovoltaic PV module based on the current-voltage characteristic provided by the manufacturers. This numerical method helps to model any PV generator and it allows us to study the static and dynamic performances of a PV system. In this paper, the operating principal of a PV module is described. The parameters which figure in the mathematical equation of a PV module are determined using MATLAB IDE in order to see the effect of climate change especially the effect of irradiance and temperature on the energy produced through graphical representations. The proposed method of extraction of the five unknown parameters is validated and compared with data given by the manufacturer for two different technologies, polycrystalline and monocrystalline PV module under various climatic conditions.
    Keywords: photovoltaic system; parameter extraction; MATLAB IDE; polycrystalline module; monocrystalline module.
    DOI: 10.1504/IJDSSS.2021.10036182
  • Fault detection and isolation using sliding mode observers with sensor fault in robot manipulator   Order a copy of this article
    by Khaoula Oulidi Omali, Mohammed Nabil Kabbaj, Mohammed Benbrahim 
    Abstract: Interest in fault detection and isolation (FDI) for nonlinear systems has grown significantly in recent years. The design of a residual generator for FDI in nonlinear systems which are affine in the control signals and in the failure modes is studied. The (FDI) approach is used to detect sensor faults on a robot manipulator that occurs on a system's specific component. The sliding mode observer is one of the FDI's methods, which are used to generate residuals when sensor faults is presented. This paper aims to improve the detection of sensor faults for an affine nonlinear system class. For a better detection of faults, a proportional derivative (PD) controller is used to improve the system's stability. Both the aforementioned method and the (PD) controller are based on the Lyapunov equation. The proposed approach is verified in simulation on a robot manipulator.
    Keywords: nonlinear system; robot manipulator; fault detection and isolation; FDI; sliding mode observer.
    DOI: 10.1504/IJDSSS.2021.10036184