EQUIPEMENT STRESSES ANALYSIS IN MV NETWORKS
The paper presents a method for computing transients in power
systems and practical results regarding the stresses on different equipment
caused by lightning strokes on the phase conductor of a 20 kV distribution line.
Cuvinte cheie: regimuri tranzitorii, solicitări cu front rapid
Keywords: transitional schemes, solicitations to the front quickly
ADJUSTABLE IN COMMUTATION VOLTAGE SOURCE
The paper presents an adjustable in commutation self-oscillating voltage
source which permits the control of the output voltage through a digital
command. The command can be made from a PC or from a microcontroller
module that controls a specialized integrated circuit, namely UC3842B. This
forms variable duration pulses of the in commutation transistor according to the
input signal.
The source has galvanic isolation in the feedback loop to assure safety.
Cuvinte cheie: sursă în comutaţie, comandă digitală, optocuplor, buclă
de reacţie, conversie analog-numerică
Keywords: source commutation, the digital command, optocoupler,
reaction, the conversion loop analog-digital
FUNCTIONAL SAFETY OF
ELECTRICAL/ELECTRONIC/PROGRAMMABLE
ELECTRONIC SAFETY-RELATED NATIONAL
AND INTERNATIONAL STANDARDIZATION
This article aims to help the designers, users, and certification bodies
of electrical/electronic/programmable electronic safety-related systems to
understand the origins and principals of functional safety identify the standards
available for guidance and give practical advice on designing, applying,
verifying and validating a “functional” safety related control system to
machinery. It is based on SR EN 61508, series of standards.
Cuvinte cheie: securitate funcțională, sisteme electrice, electronice,
electronice programabile, nivel de integritate
Keywords: functional safety, electrical systems, electronic,
programmable electronics, level of integrity
DOWNLOADS IN THE FORM OF LIGHTNING.
RISKS/HAZARDS – part I –
The article presents: terminology; the main risks/hazards arising
from electricity atmospheric effects; risk/danger of the fibrillation lightning
current through the human body; risks\/hazards generated by downloads in
the form of globular lightning; preventive measures for the management of
risks/hazards that can be generated from domestic if in the form of lightning
discharges; preventive measures for the management of risks\/hazards
other than domestic ones, which can be generated in the case of landings in
the form of lightning strikes
Cuvinte cheie: trasnet, descarcari, terminologie, riscuri/pericole,
electricitate atmosferica, trasnet globular, control, prevenire
Keywords: lightening, downloads, terminology, risks/hazards,
atmospheric electricity, lightning ball, control, prevention
DOWNLOADS IN THE FORM OF LIGHTNING.
RISKS/HAZARDS – part II –
The article presents: terminology; the main risks/hazards arising from
electricity atmospheric effects; risk/danger of the fibrillation lightning current
through the human body; risks\/hazards generated by downloads in the form of
globular lightning; preventive measures for the management of risks/hazards
that can be generated from domestic if in the form of lightning discharges;
preventive measures for the management of risks\/hazards other than domestic
ones, which can be generated in the case of landings in the form of lightning
strikes
Cuvinte cheie: trasnet, descarcari, terminologie, riscuri/pericole,
electricitate atmosferica, trasnet globular, control, prevenire
Keywords: lightening, downloads, terminology, risks/hazards,
atmospheric electricity, lightning ball, control, prevention
WEATHER FEATURES MEASUREMENTS PERFORMED
TO EVALUATE THE WIND POTENTIAL.
VALUES, MEASUREMENT INSTRUMENTS, WAYS TO
STORING MEASUREMENT VALUES AND INCIDENTS
THAT MAY OCCUR IN DATA TRANSMISSIONS
To evaluate the wind potential for a location must be know the average
multiannual values of the weather features for her. These can be computed
based on measured values. The measurement can be performed using several
types of installations, which are initially set the time range for which the weather
feature values are averaged. In this process incidents can occur, which results
in wrong data.
The cause that generate lack of measurements data can be related to
the support pillars, installation and/or sensors and the calculation equipment,
storage and data transmission over the internet.
Cuvinte cheie: meteo caracteristici, senzori, transmisii de date, reţea
GSM, incidente în datele măsurătorilor şi audiovizualului, incidente
Keywords: weather features, sensors, data transmission, GSM
network, incidents in data measurements and broadcasting, incidents
23-55 MĂSURAREA CARACTERISTICILOR METEO PENTRU DETERMINAREA POTENŢIALULUI EOLIAN.
INFLUENCES ON THE MOVEMENT OF AIR MASSES.
CONSIDERATIONS BASED ON THE EXPERIMENTAL
VALUES OBTAINED FROM ANEMOMETRIC PILLARS
In the initial management of an investment for the realization of a wind
generator farm, the most important activity is the evaluation of the target area.
The evaluation has to take in to account the existence of the electrical network
to acquire electricity, the access roads for installing and further supervising of
the equipment’s, the environmental impact etc. The most important factor in
making decision is the wind potential. It is determined from measurements
using special installation and depends entirely on relief and climate, actually by
the geographic area.
Cuvinte cheie: meteo caracteristici, potenţialul de vânt, viteza vântului,
de relief, clima, loc geografic
Keywords: weather features, wind potential, wind velocity, relief,
climate, geographical place
THE REVERSE ENGINEERING OF A RUNNER
The objective of the application is to describe the reverse engineering
stages to transform a real runner into a virtual geometry, using the Noomeo
Optinum 3D scanner, Numisoft and Rapidform XOR3 software.
Cuvinte cheie: Inginerie inversă, scaner 3D, rotor
Keywords: Reverse Engineering, 3D scanner, runner
23-57 APLICAREA INGINERIEI INVERSE PENTRU RECONSTRUCŢIA GEOMETRIEI UNUI ROTOR
NUMERICAL ANALYSYS OF RESIDUAL STRESSES
IN A CASTING
In this paper, the authors study the evolution of the residual stresses
that arise in a water drinker (used in animal husbandry), during casting. The
residual stresses are determined by simulation using a numerical method
(control volume).
Cuvinte cheie: tensiuni remanente, turnare, simulare numerică,
adăpătoare
Keywords: residual stresses, casting, numerical simulation, water
drinker
EXPERIMENTAL ANALYSYS OF RESIDUAL STRESSES
IN A CASTING
In this paper, the authors study the residual stresses that arise in a
water drinker (used in animal husbandry). The residual stresses are being
determined experimentally using blind hole method.
Cuvinte cheie: tensiuni remanente, metoda găurii oarbe cu martor de
deformație, adăpătoare
Keywords: residual stresses, blind hole method, water drinker
23-59 ANALIZA EXPERIMENTALĂ A TENSIUNILOR REMANENTE DINTR-O PIESĂ TURNATĂ
REUSABLE ELECTRO-RESISTIVE TRANSDUCER
This paper presents a Reusable Electro-Resistive Transducer for
measuring deformation of the structures of resistance during their operation.
The sensitivity of this sensor is close to the classical Electrical Resitance Strain
Gauge as having the same base of measurement. The proposed reusable
transducer’s advantage is that it can be reused several times at different
measuring points. In this manner, essential cost reductions are to be made to
the experimental measurements of stress and strain.
Cuvinte cheie: tensometrie electrică rezistivă, deformaţii, tensiuni
Keywords: tensometrie electrical resistive, strains, tension
BELLOWS ACTUATING SYSTEMS
This paper propose a thorough theoretical and experimental research
on bellows actuators in order to design and develop some operated bellows
actuators systems with at most three degree of freedom (DOF) with different
options of corrugated items, the final scope being to establish a precise method
of motion control. It is expected that most representative applications of
actuators investigated will fit in field of biomedical engineering.
Cuvinte cheie: silfoane, elemente tubulare gofrate, actuatori
Keywords: bellows, corrugated tubular elements, actuators
DETERMINING THE NATURAL FREQUENCIES
OF BENDED BEAMS
This paper presents the natural frequencies obtained from modal
analysis, performed with ANSYS software, for the first 60 vibration modes of a
bended bar (L shape) without defect and with defects situated on three different
locations along the column. The research was made in order to highlight the
changes of the structure’s dynamic behaviour in terms of natural frequencies.
Cuvinte cheie: frecvenţe proprii, bara cotită, detectarea defectelor, simulare
Keywords: natural frequencies, bended beam, damage detection, simulation
23-62 DETERMINAREA FRECVENŢELOR PROPRII
REFLECTIONS ON RAILWAY
VIBRATION VEHICLE SUSPENSIONS
Making a simple mechanical model railway vehicle must contain
masses suspended bogie and vehicle weight box connected by elastic and
dynamic elements. Thus, the suspension of railway vehicles consists of elastic
elements, connecting elements, and shock. Vibration measurements of elastic
element (or set of elastic elements) of a railway vehicle suspension requires a
stand to simulate operating conditions. This paper presents such a stand which
operates as a vibrator.
Cuvinte cheie: model mecanic, vibrații, suspensiile vehiculelor
feroviare, stand de simulare și măsurare, vibrator
Keywords: mechanical design, vibrations, suspension rail vehicle
simulation and measurement stand, vibrating
MAGNETORHEOLOGICAL DAMPERS CONSIDERATIONS
RAILWAY VEHICLES
This paper presents with a new type of hydraulic damper cylinder in
which fluid is a special fluid called magneto rheological fluid. If this liquid is in a
magnetic field when it changes its rheological properties of.
The magnetic field is stronger with the increasing liquid viscosity.
Cuvinte cheie: lichid, amortizor, câmp magnetic, vâscozitate
Keywords: liquid, damper, magnetic field, viscozity
23-64 CONSIDERAȚII DESPRE AMORTIZOARELE MAGNETOREOLOGICE LA VEHICULELE FROVIARE
ANALYSIS OF ELASTOMERIC INSULATORS
WITHOUT AND WITH LEAD HEART
Seismic isolation using neopren rubber bearings or lead rubber bearings
is achieved by inserting these devices between the infrastructure and the
superstructure in order to retrieve and dissipate seismic energy so that the
constructions will not by damage.
These devices are designed and built according to the size, complexity,
degree of loading and seismic zone where the construction will be located.
Cuvinte cheie: izolator, elastomer, inimă de plumb, rigiditate
Keywords: insulator, elastomer, lead heart, stiffness
VIBRATION AS A TREATMENT MODALITY
Whilst exposure to vibration is traditionally regarded as perilous,
recent research has focused on potential benefits. Acute physiological
responses to isolated tendon and muscle vibration and to whole body vibration
exercise are reviewed, as well as the training effects upon the musculature,
bone mineral density and posture. Possible applications in sports and medicine
are discussed. Vibration training also seems to improve balance in subpopulations
prone to fall, such as frail elderly people.
Cuvinte cheie: musculare vibraţii, modalitatea de tratament
Keywords: muscle vibration, treatment modality
THEORETICAL STUDY ON THE APPLICABILITY OF
MECHANICAL IMPEDANCE
The present paper will be a presentation of the informations from
specialized literature and international standards about the importance of
mechanical impedance study for all structures including human body.
Exposure to harmful vibrations can lead to damages of the structures
and health problems or disorders that can appear at the human body.
The knowledge of the structures and human body mechanical
impedance is essential for realizing appropriate administrative, technical and
medical prevention measures.
Cuvinte cheie: impedanță mecanică, răspuns dinamic, vibrații
mecanice
Keywords: mechanical impedance, dynamic response, mechanical
vibrations
23-67 STUDIU TEORETIC ASUPRA APLICABILITĂȚII IMPEDANȚEI MECANICE
EXPERIMENTAL STUDY OF THE VIBRATION ACTION
OF PORTABLE MACHINE TOOL ON
THE HUMAN HAND-ARM SYSTEM
This paper is an experimental study about the importance o vibration
action acting on the human operator. For this study were made a series of
measurements on different parts of the hand-arm system of a human operator.
Were measured the vibrations generated by a hammer drill operating both idle
or full load.
Conclusions reguarding this measurements were then generated and
the results are presented in the paper below.
Cuvinte cheie: vibraţii mecanice, maşini-unelte portabile, mână-braţ
Keywords: mechanical vibration, machine tools, portable, hand-arm
METHODS FOR DETERMINING THE ELASTIC
CONSTANTS OF THE MATERIAL
The behaviour of materials under the action of the loads can be
characterized by using some physical constants, called mechanical
characteristics and material elastic.
The present research represents a synthesis of analytical and
experimental methods to determine those characteristics of material.
Cuvinte cheie: tracțiune, constantă elastică, tensiune
Keywords: traction, elastic constant, stress
23-69 METODE DE DETERMINARE A CONSTANTELOR ELASTICE DE MATERIAL
THE COEFFICENT OF STEEL ELASTICITY OF THE
EXISTING INDUSTRIAL STEEL STRUCTURES
Existing industrial steel structures, and especially those we use in the
steel industry, for whom the normal operation age is approaching completion,
are affected by the phenomena of hardening and aging of steel. Depending on
the size tension (unit stress) and the period of running, this paper is intended to
adopt a different coefficient of longitudinal elasticity corresponding to
components of the resistance structure.
Cuvinte cheie: ecruisaj, îmbătrânire, modul de elasticitate,
tensiuni, valoare
Keywords: ecruisaj, aging, elasticity module, tension, value
23-70 MODULUL DE ELASTICITATE A OŢELULUI DIN STRUCTURILE METALICE INDUSTRIALE EXISTENTE
STRESS INTENSITY FACTOR OF A STEAM PIPE
SUBJECTED UNDER A THERMAL SHOCK
The temperature of a steam pipe is variable because of the steam
pressure variation inside of it. If the steam temperature variation takes place
during a short time, the steam is subjected under a thermal shock. The effect of
the thermal shock is superimposed on the effect of the mechanical load, going
to a load on the pipe. The thermal shocks are dangerous for the strength
elements.
Cuvinte cheie: conductă de abur, tenacitate la rupere, şoc termic
Keywords: steam pipe, stress intensity factor, thermal shock
NDT METHOD FOR HIGH-PRESSURE VESSELS
The high-pressure vessels are widely used in technique. Their safeoperating
without damage represents a major demand. Taking for example the
Oxygen-, Nitrogen-, or natural gas vessels, one of their main cause/motive of
damage consists of the punt-corrosion (bottom-corrosion), which leads to the
drastically reduction (shortening) of their life-time, respectively it will
compromise their working in safety conditions. The widely-used periodical
testing methods, mainly in advance of their refilling with the working agent, are
nor sure, nor efficiently. The authors propose a simply new NDT testing
protocol, based on the Moiré-Fringe Method, but it can be applied successfully
using the Digital Correlation one. There are also described two original testing
benches. The proposed methodology will assure a high-efficiently monitoring
and good traceability of the tested vessels, respectively such controlling
method, which will not diminish their initial life-times.
Cuvinte cheie: control nedistructiv, vase de presiune, metoda franjelor
moiré
Keywords: NDT, high-pressure vessel, moiré-fringe method
A NUMERICAL STUDY OF THE LOCAL STRESS FOR A
RECTANGULAR BAR WITH OPPOSITE EDGE V-NOTCHES
LOADED WITH TENSILE FORCE
The application present a numerical study of the local stress for a
rectangular bar with opposite edge V-notches loaded with tensile force and
comparative results of the SolidWorks Simulation and experimental data, for
various geometrical modifications.
Cuvinte cheie: simulare, SolidWorks, bară, concentrator
Keywords: simulation, SolidWorks, bar, stress concentrator
CONSIDERATIONS THE USE OF SHEAR MODEL FOR
BEAMS OF DIFFERENT LENGTHS
This paper presents a study of dynamic behaviour for different lenghts of
beams, preserving constat section. The natural frequencies on beams, for 8
bending vibration modes after weak axis were determinated using Sh model
and by FEM analysis. For any lenght of beam, the result is pretty good,
acceptable errors.
Cuvinte cheie: vibraţii, modul formei de vibraţie, frecvenţe, metoda Shear
Keywords: vibrations, mode shape, frequencies, the Shear method
CONSIDERATIONS THE USE OF EULER-BERNOULLI
MODEL FOR BEAMS OF DIFFERENT LENGTHS
This paper presents a study of dynamic behaviour for different lengths of
beams, preserving constant section. The natural frequencies on beams, for 8
bending vibration modes after weak axis were determinates using EB model
and by FEM analysis. The comparative study showed that for long lengths, the
model is sufficiently precise, while the lengths of the beams the errors are
significant. The comparative study showed that for long beams the model is
very precise, while the shorter lengths the errors are significant.
Cuvinte cheie: vibraţii, modul formei de vibraţie, frecvenţe, metoda
Euler-Bernoulli
Keywords: vibrations, mode shape, frequencies, the Euler-Bernoulli
method
23-75 CONSIDERAŢII PRIVIND OPORTUNITATEA UTILIZĂRII MODELULUI EULER-BERNOULLI PENTRU
CONSIDERATIONS REGARDING CORROSION EFFECTS
ON BEAMS DYNAMIC BEHAVIOR
Negative effects caused by corrosion are significant, both economically
and in terms of public safety, so incipient detection of corroded areas is
necessary to take in real-time measures to prevent the occurrence of
dangerous situations. This paper presents types of corrosion and various actual
methods used to detect corroded areas together with a new approach in
damage detection based on vibration measurements. While the proposed
method base on frequency changes, to understand the dynamic behaviour of
beams subjected to corrosion is a first step. It permits establishing appropriate
mathematical models and development of damage detection methods implying
the monitoring and analyzes of beams natural frequencies.
Cuvinte cheie: coroziune, detectarea defectelor, frecvenţe proprii
Keywords: corrosion, damage detection, natural frequency
CONSIDERATIONS ON DYNAMIC LOADING BY SHOCK OF
MATERIAL USUAL USED ON ROAD RESTRAINT SYSTEMS
This paper presents a presentation between the results of experiments
conducted by dynamic loading by shock of the material which is made the road
restraint systems, S235JR black and galvanized. For an appropriate safe level,
protection systems must absorb as much energy as possible during impact,
maintaining their integrity. Road restraint systems protect the road vehicles
from dangers, which are forwarded to the roadway minimizing serious injury.
Restraint deformed metal systems components are made of S235JR, S275JR
or other equivalent. After road restraint systems components execution, they
are promoted to the technological flow hot dip galvanizing, which are protected
against corrosion.
Cuvinte cheie: încărcare dinamică, șoc, S235JR, sisteme de reținere
rutiere
Keywords: dynamic loading, shock, S235JR, road restraint systems
23-77 CONSIDERAȚII PRIVIND SOLICITAREA DINAMICĂ PRIN ȘOC A MATERIALULUI UZUAL UTILIZAT
DESIGN AND IMPLEMENTATION OF ROAD RESTRAINT
SYSTEMS USING CAD/CAE INSTRUMENTS
The objective of this paper is to provide theoretical foundations for a
modern approach to design and execution of Road Restraint Systems using
CAD / CAE technology. The global stiffness of the road restraint system is
largely attributed to the design of the distance spacer in the initial phase of an
impact. How to make virtual modelling is based on using Solid Works software,
finite element analysis software using Hyper Mesh RADIOSS extension and
rapid prototyping for fast implementation of Road Restraint Systems
components. The paper present a new damper used to absorb the energy
produced during impact.
Cuvinte cheie: sistemele de reținere rutiere, CAD/CAE, amortizor
Keywords: road restraint systems, CAD/CAE, damper
CONSTRUCTIVE SOLUTIONS REGARDING THE
IMPLEMENTATION OF THE PROTECTIVE
RAILINGS FITTED ROADS
By definition, the railing is a wall or a railing of little height which
serves to delimit the edge of a road, a bridge, aimed at stopping vehicles and
restoration mainly on the carriageway, pedestrians and conveyance of other
road users.
Cuvinte cheie: carcase, rezistență, oţel, deformare, parapet de protecţie
Keywords: enclosures, endurance, steel, deformation, protection guardrail
23-79 SOLUȚII CONSTRUCTIVE PRIVIND REALIZAREA PARAPETELOR DE PROTECȚIE CE ECHIPEAZĂ
2D MODELS STUDY USING FINITE ELEMENT METHOD
2D models can be used for probe modelling in purpose to perform finite
element analysis in a small time. The 2D model can be the result from a 3D
model.
Cuvinte cheie: epruvete, model 2D, model 3D, elemente finite
Keywords: 2D, pattern pieces, 3D model, finite elements
METHODS OF DESIGN HELICAL COMPRESSION SPRINGS
USED IN SPECIAL EQUIPMENT, USING MEF
UTILITY Cosmos Xpress
This paper presents the pattern of modern elastic elements design for
middle arms. This model is a handy tool optimizing military specialist’s
constructive characteristics of the box elements.
Cuvinte cheie: balistică internă, elemente finite, spirală arhimedică,
discretizare, variabile de proiectare, functie obiectiv
Keywords: internal ballistics, finite elements, arhimedica, meshing,
spiral variables design, based on objective
STATISTICS METHODS APPLIED TO RELIABILITY
ENGINEERING
The analysis of system reliability often requires the use of subjective
judgments, uncertain data and approximate system models. By allowing
imprecision and approximate statistic methods provides an effective tool for
characterizing system reliability.
Cuvinte cheie: metodă, statistică, fiabilitate, sisteme tehnice, calitate
Keywords: method, statistics, reliability, technical systems, quality
1 METODE STATISTICE APLICATE ÎN STUDIUL FIABILITĂŢII SISTEMELOR TEHNICE
ESTIMATION METHOD OF MAINTENANCE INTERVALS
AND TO REDUCE ENERGY CONSUMPTION
IN PROCESS EQUIPMENT
Complex technical systems are subject to inherent failures caused by
failure of equipment components in different phases of their operation. The
existence of a database on the history of operation of each piece of equipment
is absolutely necessary given that wants to establish a optimal maintenance
schedule so as to avoid the occurrence of failures due to degradation over time
components. This paper proposes a method for calculating the rate of
occurrence of disposals due to wear (degradation time) or instant accident
where an installation of process equipment.
Cuvinte cheie: mentenanţă, uzură, predicţie
Keywords: Maintenance, Wear out, Prediction
PREDICTIVE MAINTENANCE OF GEARING MACHINERY
VIBRATION ANALYSIS TOOLS
This paper presents the implementing maintenance management for
organizing and preparing system of spare parts to optimize repair time.
Planning the activities of repair and minimizing „downtime” of the machine can
be made only through detection of possible defects. The machine tools
reliability and safety increase, they give respectively operating costs decreased
lead to a better total cost. By studying the vibration signal produced by a gear in
a machine tool structure and the change of the signal related to the presence of
defects gear can identify various defects. Defects are localized at the contact
between the mechanical parts, which means changing of geometry and
conditions of power transmission, which results in vibrations and shocks, the
measurements for determining the gear failures occur.
Cuvinte cheie: angrenajele mașinilor unelte, zgomot, vibraţii, eroare de
transmisie, mentenanța predictivă
Keywords: spur gear, noise, gear vibration, transmission error,
predictive maintenance
3 MENTENANŢA PREDICTIVĂ A ANGRENAJELOR MAŞINILOR-UNELTE PRIN ANALIZA VIBRAŢIILOR
FRICTION PHENOMENONS BETWEEN LAMELLAS OF
ELECTROMAGNETIC CLUTCH (I)
The paper presents the basic elements of friction phenomenons
between lamellas of electomagnetic clutch, after dissertation of Corneliu
Cashin Ph. D.
Cuvinte cheie: fenomenul de frecare, cuplaje electromagnetice
Keywords: the phenomenon of friction, electro-magnetic couplings
4 FENOMENELE DE FRECARE ÎNTRE LAMELELE CUPLAJELOR ELECTROMAGNETICE (I)
FRICTION PHENOMENONS BETWEEN LAMELLAS OF
ELECTROMAGNETIC CLUTCH (II)
The paper presents the basic elements of friction phenomenons
between lamellas of electomagnetic clutch, after dissertation of Corneliu
Cashin Ph. D.
Cuvinte cheie: fenomenul de frecare, cuplaje electromagnetice
Keywords: the phenomenon of friction, electro-magnetic couplings
5 FENOMENELE DE FRECARE ÎNTRE LAMELELE CUPLAJELOR ELECTROMAGNETICE (II)
CURRENT DEVELOPMENTS
IN THE CLASSICAL INSTRUMENTS OF QUALITY (I)
This paper presents the current development of the classical
instruments of quality (Pareto diagram, cause-and-effect diagram, types of
graphics).
Cuvinte cheie: diagrama Pareto, diagrama cauza efect, tipuri de
grafice
Keywords: Pareto diagram, cause-effect diagram, graph types
6 DEZVOLTĂRI ACTUALE PRIVIND INSTRUMENTELE CLASICE ALE CALITĂȚII (I)
CURRENT DEVELOPMENTS
IN THE CLASSICAL INSTRUMENTS OF QUALITY (II)
This paper presents the current development of the classical
instruments of quality (correlation diagram, control chart, flow chart).
Cuvinte cheie: diagrama de corelație, diagrama de control, diagrama
procesului
Keywords: correlation diagram, chart, chart control process
7 DEZVOLTĂRI ACTUALE PRIVIND INSTRUMENTELE CLASICE ALE CALITĂȚII (II)
MAINTENANCE REQUIREMENTS OF AN URBAN PUBLIC
TRANSPORT FLEET SIZE MEDIUM
The present paper provides a brief introduction on the field of
automotive maintenance and the it importance has in managing a medium size
fleet of public transport. Starting from the definition of the maintenance and the
main types of classification, have followed basic requirements of the urban
public transport service, organization of maintenance and need for them, in the
context of a out of work statistical study. Finally, pointing conclusions reflect the
advantages and benefits of the application maintenance strategies in a fleet of
urban public transport.
Cuvinte cheie: întreținere, fiabilitate, flotă de transport public,
autobuze, defecte, analize statistice, „diagrama Pareto”
Keywords: maintenance, reliability, public transport fleet, buses,
malfunctioning, statistical analysis, “Pareto diagram”
ROMANIAN RAILWAY AUTHORITY AFER’S FĂUREI
RAILWAY TESTING CENTER THE ONLY RAILWAY
FACILITY FROM SOUTH EST OF EUROPE
Romanian Railway Authority AFER is the technical body of Ministry of
Transport in charge with railroad safety. AFER is a complex structure with four
independent bodies: Romanian Railway Safety Authority ASFR, Romanian
Railway Notified Body ONFR, Romanian Railway Investigation Body OIFR and
Romanian Railway Licensing Body. As a part of ONFR there are AFER’s
laboratories and as part of AFER is Railway Testing Center Făurei (CTF
Făurei).
Cuvinte cheie: AFER, ONFR, CTF, încercări, validare
Keywords: AFER, ONFR, CTF, attempts, validation testing
HOW TO CALCULATE THE NECESSARY VENTILATION
QUANTITY IN CAR PARKS FOR JET VENTILATION SYSTEM
IN OPPOSITE WITH CLASSICAL VENTILATION BY DUCTS
The main purpose of this article is to describe the principles of CO
ventilation in car parks and to presents how to calculate the necessary
ventilation quantity for jet ventilation system in opposite with classical ventilation
by ducts.
Cuvinte cheie: CO, aer viciat, evacuare, jet-fun şi clasic
Keywords: CO, air, exhaust, tainted, jet-fun and classic
VERIFICATION OF ELECTRIC CAR GEARBOX
ON THE EXPERIMENTAL STAND
The paper presents the verication of electric car gearbox on the
experimental stand
Cuvinte cheie: stand de verificare cutii de viteză
Keywords: check boxes stand speed
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
DEMONSTRATION STAND FOR ROTATIONAL KINETIC
ENERGY RECOVERY FROM THE ROTATING MECHANISMS
WITH HYDRAULIC DRIVING
The paper presents a demonstrative stand which aims the
demonstration of possibility for rotational kinetic energy recovery from the
rotating mechanisms with hydraulic driving. There are presented the conceptual
schema of the stand, the main components of the stand and, finally, there are
presented some experimental results, which contain the graphical variation of
the main dynamic parameters, which can demonstrate the possibility to
recovery of the rotational kinetic energy from the rotating Mechanisms with
hydraulic driving from the technological equipments.
Cuvinte cheie: recuperarea energiei, stand de testare, cercetare
experimentală, eficienţă energetică, senzori şi traductoare, achiziţie date
Keywords: energy recovery, testing, experimental research, energy
efficiency, sensors and transducers, data acquisition
STUDIES AND RESEARCHERS OF EQUIPEMENT
MAINTENANCE
This paper contains a few knpwledges about the equipment
maintenance. The study proposed refers to two aspects particularly important in
the maintenance study. They relate to: global vision of the management and
maintenance routine maintenance conditional.
Cuvinte cheie: mentenanţa utilajelor, managementul mentenanţei,
mentenanţa condiţională
Keywords: equipment maintenance, maintenance management,
maintenance conditional
SOLID STATE SOLUBILITY EXTINCTION OF Fe-Ni SISTEM
BY MECHANICAL ALLOYING
Experiments took place in a high energy ball planetary mill, with four
villas. There were used 46 balls having 15 mm diameter to mill 100 g powder
mixtures of Fe80Ni20, Fe70Ni30, Fe60Ni40, Fe50Ni50, Fe40Ni60, Fe30Ni70,
Fe20Ni80 (figures in mass %) in each vial. Milling space of each vial was filled
a half with balls and powder and the balls/powder mass ratio was of 8: 1. There
were taken samples (5 g of mixture powder) at 0, 1, 2, 4, 8, 16, 32, 48, and 64
hours of milling. The appeared identified phases are solid solutions of Fe(VCC)
and Ni(FCC) in the milled mixtures subjected to a minimum 2 hours of milling.
Iron is imposing its crystallizing system between 70 – 100 mass % of Fe and
nickel between 40 – 100 mass % of Ni.
Cuvinte cheie: aliere mecanică, pulberi Fe – Ni, moară planetară
Keywords: mechanical alloying, Fe-Ni powders, planetary mill
DEVELOPING OF THE HIGH-STRENGTH
LOW-ALLOY STEEL (HSLA)
In present high-strength low-alloy steels have gained a significant
position in the engineering arena and began the most important ferrous alloy
design and manufacture of metal structures. Achieving high-strength low-alloy
steels usually require a greater complexity to the design and steel processing to
ensure structural integrity. These include a complex system in which the
processing conditions are crucial and require an appropriate design of steel
grades used. With increasing resistance of the material and economic use of a
welding process can be achieved remarkable cost savings in construction
works. Now high-strength low-alloy steels are used for almost all complex
metallic structures: tanks, bridges, construction equipment, machinery etc. This
is largely confirmed by the use of high strength steel with vanadium micro Highstrength
low-alloy-V.
Cuvinte cheie: oţel HSLA, caracteristici, oţel HSLA-V
Keywords: HSLA steel, HSLA steel, features index
EXPERIMENTAL DEVICE AND TESTING STAND FOR
DETERMINING OF THE FRICTION FORCES FROM THE
PISTON SEALING OF THE HYDRAULIC CYLINDERS
The paper presents an experimental research regarding the
determining the friction forces which appear in the piston sealings of the
hydraulic cylinders and are presented the adopted technical solutions for the
experimental device and tor the testing stand for determining of the friction
forces from the piston seals, and, also, some interesting conclusions.
Cuvinte cheie: etanşări, forţe de frecare, cilindri hidraulici, dispozitiv
experimental, stand testare, senzori şi traductoare, achiziţie de date
Keywords: seals, frictional forces, hydraulic cylinders, experimental
device, test bench, sensors and transducers, data acquisition
THE DETERMINATION OF PARAMETERS
OF COLD HARDENING LAW
The paper presents the basic elements for determination of
parameters of cold hardening law.
Cuvinte cheie: coeficient de ecruisare
Keywords: coefficient of-hardening