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152 results on '"Buccella, C"'

1. A Simple Software-based Resolver To Digital Conversion System

Author

Di Tommaso A. O., Miceli R., Nevoloso C., Scaglione G., Schettino G., Buccella C., Cecati C., Di Tommaso A.O., Miceli R., Nevoloso C., Scaglione G., Schettino G., Buccella C., and Cecati C.

Subjects
Resolver to Digital Converter, Settore ING-IND/32 - Convertitori, Macchine E Azionamenti Elettrici, Resolver, speed measurement, Electric Drives
Abstract

In this paper, a software-based resolver to digital converter (RDC) is proposed. The hardware signal conditioning circuit is realized using common electronic components, while the algorithm can be implemented either using a microcontroller or an FPGA. Its validation and performance analysis has been carried out using an interior permanent magnet synchronous machine drive and, with comparative purposes, an LTN Servotechnik 1024 ppr incremental encoder. Tests show that the proposed RDC is characterized by a good dynamic response and precision, moreover, due to low computational demand, it can be successfully adopted without significant extra cost.

Published
2022
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2. Investigation about selective harmonic elimination in unbalanced multilevel inverters

Author

Buccella C., Cimoroni M. G., Cecati C., Di Tommaso A. O., Nevoloso C., Schettino G., Meo S., Buccella, C., Cimoroni, M. G., Cecati, C., Di Tommaso, A. O., Nevoloso, C., Schettino, G., Meo, S., Buccella C., Cimoroni M.G., Cecati C., Di Tommaso A.O., Nevoloso C., Schettino G., and Meo S.

Subjects
l-level Cascaded H-bridges (CHB) Inverters, Power Quality, Total Harmonic Distortion (THD), Selective Harmonic Elimination (SHE), l-level Cascaded H-bridges (CHB) Inverter
Abstract

In this paper 5 and 7 levels cascaded H-bridges inverters are considered, feeding by unequal dc voltage sources. The effect of these unbalancing operation is examined concerning harmonic analysis and total harmonic distortion of the output voltages. The system of equations, obtained by the expansion in the Fourier series of phase output voltage, is solved by applying a method of graphic solution that allows obtaining the switching angles able to eliminate the lower order harmonics.

Published
2022

4. Mathematical formulation of pulse amplitude modulation selective harmonic elimination in multilevel three phase inverters

Author

Buccella C., Cimoroni M. G., Cecati C., Di Tommaso A. O., Nevoloso C., Schettino G., Buccella C., Cimoroni M.G., Cecati C., Di Tommaso A.O., Nevoloso C., and Schettino G.

Subjects
Total Harmonic Distortion (THD), Selective Harmonics Elimination (SHE), Selective Harmonics Mitigation (SHM), Settore ING-IND/32 - Convertitori, Macchine E Azionamenti Elettrici, Cascaded H-bridges (CHB) Multilevel Inverters
Abstract

In this paper multilevel cascaded H-bridges (CHB) three phase inverters with 2n dc sources, n=1,2,3,... are considered and a mathematical formulation providing both 2n switching angles and dc voltage source to eliminate n+1 harmonics and their respective multiple from their output voltage waveform, is proposed. The computed angles don't depend on modulation index and the source voltages linearly vary with it. The proposed procedure finds the solution through an analytical formula that avoids to solve transcendental systems and presents very low computational cost. A lot of low order harmonics are eliminated, returning a very low total harmonic distortion (THD). Particularly for 9-level configuration, the first not mitigated harmonic is the 17th and the percentage THD is 5.59%.

Published
2022

5. Enhanced modulation strategy for 7-level voltage waveform in asymmetrical 5-level Cascaded H-Bridge Inverters

Author

Di Tommaso A. O., Miceli R., Nevoloso C., Scaglione G., Schettino G., Viola F., Buccella C., Cecati C., Cimoroni G., Di Tommaso A.O., Miceli R., Nevoloso C., Scaglione G., Schettino G., Viola F., Buccella C., Cecati C., and Cimoroni G.

Subjects
SHE or SHM algorithms, Dead time, THD, Settore ING-IND/32 - Convertitori, Macchine E Azionamenti Elettrici, Asymmetrical Cascaded H-Bridge Inverter, Modulation techniques
Abstract

The CHBMI performance optimization can be reached both with hardware and software solutions. Generally, asymmetrical configurations allow the extension of the voltage levels number and the implementation of an innovative modulation strategy allows for improving the performance in terms of harmonic distortion and conversion efficiency. This work is devoted to the development of a modulation strategy that allows improving the performance of an asymmetrical single-phase five-level Cascaded H-Bridge Inverter generating a 7-level voltage waveform. Thus, a digital approach and corresponding digital functions are presented. Subsequently, the impact of the dead time and the influence on the voltage harmonic distortion have been discussed. Through simulation analysis, in the Matlab environment, the main benefits and drawbacks of the proposed approach have been discussed.

Published
2022

11. Finite-element analysis of temperature increase in vascularized biological tissues exposed to RF sources

Author

De Santis, V., Feliziani, M., Maradei, F., and Buccella, C.

Subjects
Biological models -- Usage, Finite element method -- Usage, Thermal analysis -- Reports, Tissues -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

A new model of numerical dosimetry is proposed for RF exposure. First, the specific absorption rate (SAR) is computed. Then, the heat transfer governed by the bio-heat equation with convection term is numerically solved by a finite-element method (FEM) procedure considering the discrete vascular model of the perfused tissue. By some manipulations of the FEM equations and by generating an adequate FEM mesh, it is possible to solve the thermal convection in the blood vessels considering a one-dimensional domain embedded in the fully three-dimensional domain where only the thermal diffusion is analyzed. Index Terms--Bio-heat equation, discrete vascular model, finite-element method (FEM), numerical dosimetry.

Published
2009

12. Prototype design of a thin-film bulk acoustic-wave resonator by the finite element method

Author

De Santis, V., Feliziani, M., Buccella, C., and Tognolatti, P.

Subjects
Finite element method -- Usage, Resonators -- Research, Resonators -- Properties, Business, Electronics, Electronics and electrical industries
Abstract

A thin film bulk acoustic wave resonator (FBAR) used in the RF frequency region of a few gigahertz is considered and its impedance is evaluated by using a harmonic analysis with the three-dimensional finite element method. In particular, the spurious characteristics caused by variations in the electrode area, as well as all the resonant modes and the mode shapes are analyzed. A design procedure is presented by using a prediction software tool. An experimental prototype is built and the measured results are compared to the numerical ones. Index Terms--Film bulk acoustic wave resonator (FBAR), finite element analysis, multiphysics, piezoelectric material.

Published
2009

13. Pulse-shaping numerical procedures for ultrawide bandwidth systems

Author

Buccella, C., Feliziani, M., and Manzi, G.

Subjects
Ultra wideband technology -- Research, Electromagnetic compatibility -- Analysis, Radio transmitters -- Design and construction, Business, Electronics, Electronics and electrical industries
Abstract

This paper deals with the radiation produced by ultrawide-band (UWB) impulse radio transmitters. A numerical procedure is first proposed in order to define the ideal UWB pulse able to be compliant with the FCC emission mask, taking into account the effect of the UWB radiating antenna. The obtained ideal UWB pulse is then decomposed in a linear combination of Gaussian pulses. A numerical procedure for electromagnetic field calculation is finally applied to verify the compliance of the generated pulse with the FCC emission standards. Index Terms--Antenna radiation, cognitive radio, electromagnetic compatibility (EMC), numerical computation, pulse shaping, ultrawide-band (UWB) radio communication.

Published
2007

14. Three-dimensional FEM approach to model twisted wire pair cables

Author

Buccella, C., Feliziani, M., and Manzi, G.

Subjects
Finite element method -- Usage, Electromagnetic compatibility -- Research, Crosstalk -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

A study to model an unshielded twisted wire pair (TWP) cable above-ground plane is presented. The TWP line is discretized into small sections of fine which are analyzed by the 3-D finite-element method in order to extract the equivalent multiport network suitable for circuit analysis. The method is compared with the theory of nonuniform transmission lines and with the method of moments. A set of experimental results is finally carried out in order to validate the calculations. Index Terms--Crosstalk, electromagnetic compatibility, electromagnetic field numerical computation, finite-element method (FEM), transmission lines, unshielded twisted wire pair.

Published
2007

15. Wavelet denoising approach to extract accurate FDTD solution with coarse discretization in transmission lines

Author

Buccella, C., Feliziani, M., and Manzi, G.

Subjects
Wavelet transforms -- Research, Electromagnetism -- Research, Business, Electronics, Electronics and electrical industries
Abstract

This paper describes an efficient procedure, based on the wavelet technique, to extract an accurate solution, starting from the finite-difference time-domain results obtained by using a coarse discretization of the computational domain. The proposed approach leads to an important reduction of the computational time and resources. The new method is tested in the analysis of the voltage and current wave propagation in a transmission line. Index Terms--Finite-difference time-domain (FDTD) method, numerical dispersion, transmission line, wavelet transform.

Published
2005

16. Magnetic field computation in a physically large domain with thin metallic shields

Author

Buccella, C., Feliziani, M., Maradei, F., and Manzi, G.

Subjects
Magnetic shielding -- Research, Finite element method -- Research, Electromagnetism -- Research, Business, Electronics, Electronics and electrical industries
Abstract

A three-dimensional edge element procedure is presented to analyze the magnetic field around thin shields embedded in a physically large domain. The shield region is eliminated from the computational domain and coupled boundary conditions named impedance network boundary conditions are imposed on the new boundary surfaces to take into account the field discontinuity produced by the eliminated shield. An experimental setup is built and the measured magnetic fields are compared to the results obtained by the proposed procedure. Index Terms--Coupled boundary conditions, edge elements, finite-element method (FEM), impedance network boundary condition (INBC), physically large domain, shielding.

Published
2005

19. Two-dimensional FDTD analysis for ionized electromagnetic fields

Author

Buccella, C. and Orlandi, A.

Subjects
Electromagnetic fields -- Analysis, Time-domain analysis -- Usage, Business, Electronics, Electronics and electrical industries
Abstract

In this paper the transient analysis of pulsed electromagnetic field in a two-dimensional domain filled by ions and charged powders is carried out by the Finite Differences Time Domain method. Part of the non-linear partial differential equations of the model are solved by means of an implicit scheme, the remaining part by an explicit upwind scheme. The disadvantages of other possible solutions are discussed. For an application the comparison between calculated and measured results is considered. Index terms-Numerical methods, finite differences, non-linear problems.

Published
1998

39. Episodi di mortalità determinati da E. coli nel Capriolo nell’Appennino Settentrionale

Author

Guberti V., Battisti A., De Marco M. A., Morabito S., Di Guardo G., Buccella C., Lavazza A., Raganella Pelliccioni E., DELOGU, MAURO, BRUNO BASSANO CAROL MANN ACHAZ VON HARDENBERG, Guberti V., Battisti A., De Marco M.A., Morabito S., Delogu M., Di Guardo G., Buccella C., Lavazza A., and Raganella Pelliccioni E.

Subjects
ROE DEER, EPEC, parasitic diseases, ESCHERICHIA COLI
Abstract

0:74 Escherichia coli epidemic in a Roe deer metapopulation of the Northern Apennines, Italy. An epidemic of enteropathogenic (EPEC) E. coli in a in a free living metapopulation of Roe deer Capreolus capreolus of the Northern Apennines (Italy) is described. 40 out of the 132 censued animals were radiocollared. In the radiocollared animals the infection resulted in a morbility of 12.5% (SD 5.2%), with a lethality of 80% (SD 18%) and the whole mortality reached 10%.(SD 4.7%). The E. coli responsible of the infection was classified as 0:74. The pathological lesions and some clinical features of the infection are described.

Published
2005

40. EXTRAPOLATION METHOD FOR MAXIMAL AND 24-H AVERAGE LTE TDD EXPOSURE ESTIMATION.

Author

Franci, D., Grillo, E., Pavoncello, S., Coltellacci, S., Buccella, C., and Aureli, T.

Subjects
LONG-Term Evolution (Telecommunications), UNIVERSAL Mobile Telecommunications System, BANDWIDTHS, ORTHOGONAL frequency division multiplexing, FREQUENCY division multiple access
Abstract

The Long-Term Evolution (LTE) system represents the evolution of the Universal Mobile Telecommunication System technology. This technology introduces two duplex modes: Frequency Division Duplex and Time Division Duplex (TDD). Despite having experienced a limited expansion in the European countries since the debut of the LTE technology, a renewed commercial interest for LTE TDD technology has recently been shown. Therefore, the development of extrapolation procedures optimised for TDD systems becomes crucial, especially for the regulatory authorities. This article presents an extrapolation method aimed to assess the exposure to LTE TDD sources, based on the detection of the Cell-Specific Reference Signal power level. The method introduces a βTDD parameter intended to quantify the fraction of the LTE TDD frame duration reserved for downlink transmission. The method has been validated by experimental measurements performed on signals generated by both a vector signal generator and a test Base Transceiver Station installed at Linkem S.p.A facility in Rome. [ABSTRACT FROM AUTHOR]

Published
2018
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