Marian-Dumitru NEDELONI

34-8 STUDIU PRIVIND REALIZAREA PRACTICĂ A UNUI AMPLIFICATOR AUDIO DE PUTERE – Partea I

Această intrare a fost publicată în 2018 Volumul 34 și etichetată Alexandru SZUCS Lidia NEDELONI Luminița BARBONI Marian-Dumitru NEDELONI la de

STUDY REGARDING THE SELF-CONSTRUCTION
OF AN AUDIO POWER AMPLIFIER – Part I
This paper presents a study regarding the self-construction of an audio power amplifier, where beside the theoretical part regarding the electronic devices and electronic circuits, the motivation of research was mentioned, some current and future trends in power amplifiers were describes respectively, the initial model of the studied amplifier as well the 3D modeling of the audio power amplifier (2 x 100 W) were presented.
Cuvinte cheie: studiu, realizare practică, amplificator audio de putere
Keywords: study, self-construction, audio power amplifier

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32-7 CONCEPEREA ȘI DESCRIEREA SISTEMULUI DE ACȚIONARE ȘI REGLARE AL UNEI MICROTURBINE HIDRAULICE CROSS-FLOW

Această intrare a fost publicată în 2017 Volumul 32 și etichetată Adrian PELLAC Laurenţiu-Sorin BOGDAN Marian-Dumitru NEDELONI Mariana-Ionela PELEA la de

DESIGN AND DESCRIPTION OF AN DRIVE AND REGULATION SYSTEM AT A CROSS-FLOW MICROHYDROTURBINE

 

This paper presents beside the practical concepts, also theoretical calculation to establish and define basic design of a drive and regulation system used regularity to micro-hydro turbine, specifically Cross-Flow. Virtual 3D designed are most modern models solutions and hydraulic drawing was used with success to achieve physical models by execution drawings.

 

Keywords: Cross-flow micro turbine, runner, flow, governor, flaps

Cuvinte cheie: micoturbină Cross-flow, rotor, debit, regulator de viteză, clapete

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29-88 LUCRUL CU PROGRAMUL SOLIDWORKS PENTRU CALCULUL FRECVENŢEI PROPRII A UNUI CUB UTILIZÂND STUDIUL DE TIP „FRECVENŢĂ”

Această intrare a fost publicată în 2016 Volumul 29 și etichetată Cincă-Ionel LUPINCA Cornelia Victoria ANGHEL DRUGĂRIN Marian-Dumitru NEDELONI Viorel Ionuţ BIZĂU la de

WORKING WITH SOLIDWORKS SOFTWARE FOR THE
CALCULATION OF NATURAL FREQUENCY OF A CUBE
USING THE „FREQUENCY” TYPE STUDY
This paper presents the work with SolidWorks software regarding the
Simulation module respectively the „Frequency” type study. This type of study will
highlight the calculation and results for the natural frequency of vibration modes for
a cube with the side of 50 mm. To see how the natural frequency values can be
change, different geometries of the same designed 3D cube will be make.
Keywords: SolidWorks software, study, natural frequencies, cube
Cuvinte cheie: programul SolidWorks, studiu, frecvenţe proprii, cub

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20-37 CALCULUL FORŢEI AERODINAMICE ŞI DISTRIBUŢIEI DE PRESIUNI PENTRU UN COŞ VERTICAL

Această intrare a fost publicată în 2011 Volumul 20 și etichetată Daniel DAIA Dorian NEDELCU Draghiţa IANICI Florentin Mirel POP Marian-Dumitru NEDELONI Raoul Cristian AVASILOAIE la de

AERODYNAMIC FORCE AND PRESSURE DISTRIBUTION
CALCULUS FOR A VERTICAL FUNNEL
The objective of the application is to determine the aerodynamic force
and pressure distribution resulted from wind action applied on a vertical funnel with
diameter D = Ø3 m and height H = 54 m. The velocity of the air stream is 20 m/s
and air density is 1.2 kg/m3. The objective of the application is to compare the
results predicted by Solid Works Flow Simulation with experimental data.
Keywords: aerodynamic forces, pressure distribution, Flow Simulation
Cuvinte cheie: forţă aerodinamică, distribuţie presiuni, Flow Simulation

37 CALCULUL FORŢEI AERODINAMICE ŞI DISTRIBUŢIEI

24-12 TESTAREA COMPORTAMENTULUI LA EROZIUNE CAVITAŢIONALĂ A UNUI ALIAJ NEFEROS CU 88 % ALUMINIU

Această intrare a fost publicată în 2013 Volumul 24 și etichetată Daniel CHIRUŞ Marian-Dumitru NEDELONI la de

CAVITATION EROSION BEHAVIOR TESTING OF A NON
FERROUS ALLOY WITH 88 % ALUMINIUM
This paper presents cavitation erosion behaviour testing of the
nonferrous alloys AlSi12 with 88 % Aluminium. Vibratory cavitation tests were
made on a cavitation stand in the laboratory, using the stationary specimen
method. This alloy is not subject to cavitation erosion in practical applications,
as is the stainless steels used in hydraulic turbines, but the experimental
research highlight the behaviour of a material (AlSi12, in this case) when the
period of time testing are different. Research results are presented through
graphs and representative images.
Cuvinte cheie: eroziune cavitaţională, compoziţie chimică, macrostructură
Keywords: cavitation erosion, chemical composition, macrostructure

12 TESTAREA COMPORTAMENTULUI LA EROZIUNE CAVITAŢIONALĂ A UNUI ALIAJ NEFEROS