Electromagnetic Model to Estimate the Vibrations of a Switched Reluctance Machine on the Basis of the Electric Power Supply

Benabdallah Mohammed Badreddin 대한전기학회 2008 Journal of Electrical Engineering & Technology Vol.3 No.1

The vibrations and noise origin in electric material is due to several coupled physical phenomena. The revolving electric machine complete modeling is complex; it does not allow simple parametric machine structure studies for various operation modes. This work presents a simple electromagnetic model which makes possible the machine principal parts flow estimation from flux density. Special interest is given in determining Switched Reluctance Machine (S.R.M) radial acceleration in accordance with the current supply. Our focus will be only on the magnetic origin efforts that are dominating in the S.R.M. The efforts calculation versus the current is presented in the case of a machine with a linearized rate. These efforts are considered as a tangential force producing the torque and a radial force that generates no torque. The application is realized on a 6/4 low power S.R.M type (6 stator teeth and 4 teeth rotor). The mechanical response is substituted in a transfer function. The model takes account of the power supply of the machine, the relation between the current supply and the efforts as well as the vibratory response of the machine to these efforts. Finally, the model is validated by comparison with similar experimental results within the framework of the definite assumptions.

Electromagnetic Model to Estimate the Vibrations of a Switched Reluctance Machine on the Basis of the Electric Power Supply

Benabdallah Mohammed Badreddine 대한전기학회 2008 Journal of Electrical Engineering & Technology Vol.3 No.1

The vibrations and noise origin in electric material is due to several coupled physicalphenomena. The revolving electric machine complete modeling is complex; it does not allow simple electromagnetic model which makes possible the machine principal parts flow estimation from flux density. Special interest is given in determining Switched Re1uctance Machine (S.R.M) radial acceleration in accordance with the current supply. Our focus will be only on the magnetic origin efforts that are dominating in the S.R.M. The efforts calculation versus the current is presented in the case of a machine with a linearized rate. These efforts are considered as a tangential force producing the torque and a radial force that generates no torque. The application is realized on a 6/4 low power S.mechanical response is substituted in a transfer function. The model takes account of the power supply of the machine, the relation between the current supply and the efforts as well as the vibratory response of the machine to these efforts. Finally, the model is validated by comparison with similar experimental results within the framework of the definite assumptions.

Electromagnetic Model to Estimate the Vibrations of a Switched Reluctance Machine on the Basis of the Eelctric Power Supply

Badreddine, Benabdallah Mohammed The Korean Institute of Electrical Engineers 2008 Journal of Electrical Engineering & Technology Vol.3 No.1

The vibrations and noise origin in electric material is due to several coupled physical phenomena. The revolving electric machine complete modeling is complex; it does not allow simple parametric machine structure studies for various operation modes. This work presents a simple electromagnetic model which makes possible the machine principal parts flow estimation from flux density. Special interest is given in determining Switched Reluctance Machine (S.R.M) radial acceleration in accordance with the current supply. Our focus will be only on the magnetic origin efforts that are dominating in the S.R.M. The efforts calculation versus the current is presented in the case of a machine with a linearized rate. These efforts are considered as a tangential force producing the torque and a radial force that generates no torque. The application is realized on a 6/4 low power S.R.M type (6 stator teeth and 4 teeth rotor). The mechanical response is substituted in a transfer function. The model takes account of the power supply of the machine, the relation between the current supply and the efforts as well as the vibratory response of the machine to these efforts. Finally, the model is validated by comparison with similar experimental results within the framework of the definite assumptions.

Quantum confinement and effective masses dependence in black phosphorus quantum dots and phosphorene

I. Benabdallah,A. Sibari,H. El Masaoudi,W. Azouzi,M. Benaissa 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-

In the present study, quantum confinement effect in phosphorene and black phosphorus quantum dots isextensively studied from experimental and theoretical viewpoints. These quantum structures were preparedwith the help of Benzonitrile solvent using Liquid Phase Exfoliation and solvothermal-assistedLiquid Phase Exfoliation, respectively. On one hand, Fourier-transform infrared spectroscopy shows nosign of phosphorus oxidation in both phosphorene and black phosphorus quantum dots solutions. Furthermore, Raman spectroscopy showed a shift in B2gandA2gphonon modes for phosphorene and blackphosphorus quantum dots as compared to bulk black phosphorus. On the other hand, structural characterizationvia high-resolution transmission electron microscopy imaging and electron diffraction patternsshowed a high degree of crystallinity in both quantum structures with no sign of aggregations. Opticalproperties characterization showed the expected increase in the bandgap value for both quantum structures,which were supported by theoretical calculations using density functional theory and effectivemass approximation. Interestingly, we demonstrate that the quantum confinement observed in phosphoreneis weakened to the expected extent, relative to that in BPQDs, by the loss of two confinement dimensions. Appropriate models, describing the bandgap and effective mass dependence as a function of theconfinement regime, are presented.

New Backstepping-DSOGI hybrid control applied to a Smart-Grid Photovoltaic System

Nebili, Salim,Benabdallah, Ibrahim,Adnene, Cherif International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.4

In order to overcome the power fluctuation issues in photovoltaic (PV) smart grid-connected systems and the inverter nonlinearity model problem, an adaptive backstepping command-filter and a double second order generalized Integrators (DSOGI) controller are designed in order to tune the AC current and the DC-link voltage from the DC side. Firstly, we propose to present the filter mathematical model throughout the PV system, at that juncture the backstepping control law is applied in order to control it, Moreover the command filter is bounded to the controller aiming to exclude the backstepping controller differential increase. Additionally, The adaptive law uses Lyapunov stability criterion. Its task is to estimate the uncertain parameters in the smart grid-connected inverter. A DSOGI is added to stabilize the grid currents and eliminate undesirable harmonics meanwhile feeding maximum power generated from PV to the point of common coupling (PCC). Then, guaranteeing a dynamic effective response even under very unbalanced loads and/or intermittent climate changes. Finally, the simulation results will be established using MATLAB/SIMULINK proving that the presented approach can control surely the smart grid-connected system.

Coupling WetSpass and MODFLOW for groundwater recharge assessment: case study of the Takelsa multilayer aquifer, northeastern Tunisia

Nesrine Ghouili,Nesrine Ghouili,Mounira Zammouri,Sihem Benabdallah,Boutheina Farhat 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.5

The water scarcity and its socio-economic significance with respect to water demand for agriculture, industry and tourism, in the northeastern Tunisia (Cap-Bon), are at the origin for prospecting new groundwater resources and for developing groundwater models that can be used to their control and management. The Takelsa multilayer aquifer is one of the important aquifers of the northeast in Tunisia. It is among the aquifers which are still slightly known in spite of its exploitation since the 80s. This paper is aimed to quantify the groundwater recharge of the Takelsa multilayer aquifer. The groundwater recharge is assessed using WetSpass which is a physically based model integrated in GIS ArcView as a raster model. The simulated results are given seasonally and yearly at the grid level. These results are subsequently incorporated in the groundwater flow simulation model MODFLOW in order to simulate the hydraulic head distribution. The steady state groundwater flow calibration was obtained by comparing the observed and the simulated hydraulic heads. The mean annual evapotranspiration, surface runoff and groundwater recharge simulated by WetSpass, are 461, 92 and 22 mm, respectively. The groundwater recharge represented 4.3% of the precipitation while 17.8% and 89% are respectively lost by surface runoff and evapotranspiration.

In-Vitro Regeneration of Olive Tree by Somatic Embryogenesis

Trabelsi, El Bahri,Bouzid, Sadok,Bouzid, Monji,Elloumi, Nedra,Belfeleh, Zina,Benabdallah, Abdallah,Ghezel, Rachida 한국식물학회 2003 Journal of Plant Biology Vol.46 No.3

We induced somatic embryogenesis from the cotyledon segments of Olea europea (L) cvs, 'Chetoui', 'Chemleli', and 'Arbequina' . Calli were established from all three cultivars on OMc media supplemented with IBA and 2i-P. The greatest success was obtained with media that contained zero or low concentrations of growth regulators. High levels of hormones (i.e.,>0.5 mgL^(-1) IBA and 2i-P) inhibited embryogenesis. Embryos at different maturation stages were observed with continuously proliferating secondary embryogenesis. Abnormally shaped embryos and teratoma were also noted. Four weeks was the optimal incubation period for inducing embryogenesis on the auxincontaining medium. In addition, 30 to 40 gL^(-1) sucrose was more effective than glucose in stimulating the growth and maturation of somatic embryos. Embryogenic efficiency was also higher when multivariate combinations of nitrogen sources (inorganic and organic nitrogen forms) were used. The plantlets that were derived from our germinating somatic embryos were similar to those obtained from axillary buds.