THE DETERMINATION OF GENERATING ACCURACY
OF ELICOID SURFACE WITH A DEVICE ATTACHABLE
ON THE PLANE GRINDING MACHINE
The paper presents the basic elements for determination of generating
accuracy of helicoid surface with a device attachable on the plane grinding
machine.
Cuvinte cheie: suprafaţă elicoidală
Keywords: helical surface
TEORETICAL COSIDERATIONS ABOUT MAIN SURFACES
OF ORTHOGONAL WORM-GEAR DRIVES (I)
The paper presents the basic elements about the geometry of helicall
surfaces of the orthogonal worm- gear drives, after dissertation of Christian
Häner, Ph.D.
Cuvinte cheie: suprafeţe elicoidale
Keywords: helical surfaces
TEORETICAL COSIDERATIONS ABOUT MAIN SURFACES
OF ORTHOGONAL WORM-GEAR DRIVES (II)
The paper presents the basic elements about the geometry of helicall
surfaces of the orthogonal worm- gear drives, after dissertation of Christian
Häner, Ph.D.
Cuvinte cheie: suprafeţe elicoidale
Keywords: helical surfaces
CONSIDERATIONS ABOUT POSSIBILITY OF
MANUFACTURE OF CONICAL HOB
AT S.C. SCULĂRIA SRL CUGIR (I)
The paper presents the basic elements about possibility of
manufacture of conical hob at S.C. Sculăria srl Cugir
Cuvinte cheie: freza melc conică
Keywords: snail taper milling
73 CONSIDERAŢII ASUPRA POSIBILITĂŢII DE MANUFACTURARE A FREZLOR MELC CONICE
CONSIDERATIONS ABOUT POSSIBILITY
OF MANUFACTURE OF CONICAL HOB
AT S.C. SCULĂRIA SRL CUGIR (II)
The paper presents the basic elements about possibility of
manufacture of conical hob at S.C. Sculăria srl Cugir
Cuvinte cheie: freza melc conică
Keywords: snail taper milling
74 CONSIDERAŢII ASUPRA POSIBILITĂŢII DE MANUFACTURARE A FREZLOR MELC CONICE
ABOUT OF KINEMATICS OF ACTUATORS WITH
PLANETARY ROLLERS
The paper presents the basic elements about of kinematics of
actuators with planetary rollers.
Cuvinte cheie: cinematică, role planetare, actuatori cu role
Keywords: kinematics, planetary roller, roller actuator
GEAR AXIS PARALLEL HAVING SPECIAL PROFILES
Gears with parallel axes with neevolventic’s profile can be used in
industrial watchmaker, and general construction machinery, taking into account
the current technological possibilities in manufacturing gears.
Cuvinte cheie: angrenaj, roată dinţată, transmisii, pinion
Keywords: gear, cogwheel, transmission, pinion
THE UTILISATION POSSIBILITY OF CYCLOIDAL GEARING
WITH THEORETICAL EXACT TOOTHING PROFILEES FOR
FUSE WITH WATCH MECHANISM
The paper presents the utilisation possibility of cycloidal gearing with
theoretical exact too thing profiles for fuse with watch mechanism.
Cuvinte cheie: dantură cicloidală
Keywords: gear cicloidala
THE UTILISATION POSSIBILITY OF CYCLOIDAL GEARING
WITH THEORETICAL EXACT TOOTHING PROFILEES FOR
FUSE WITH WATCH MECHANISM
The paper presents the utilisation posibility of cycloidal gearing with
theoretical exact toothing profiles for fuse with watch mechanism.
Cuvinte cheie: dantură cicloidală
Keywords: gear cicloidala
UNELE PROBLEME PRIVIND REZISTENŢA ELECTRICĂ
A TERMOCUPLURILOR
La măsurarea temperaturii cu termocupluri apare o variaţie nedorită a
rezistenţei electrice a acestora în funcţie de lungimea de introducere în mediul
de măsurare şi de temperatura medie a lor. În cadrul acestei comunicări se
tratează determinarea prin măsurare şi prin calcul a rezistenţei electrice a
termocuplurilor aflate în exploatare, cu prezentarea diagramelor aferente şi a
unor exemple pentru termocuplul PtRh-Pt.
Bei Temperaturmessungen mit Thermoelementen tritt eine unerwünschte
Änderung des elektrischen Widerstandes der Thermopaare ein, abhängig
von der Länge ihres Einbaus und von ihrer mittlerer Temperatur. Innerhalb
dieses Aufsatzes wird die Bestimmung durch Messen oder durch Rechnen des
elektrischen Widerstands von in Betrieb befindlichen Thermoelementen,
behandelt. Gleichzeitig wurden Diagramme entwickelt in diesem Sinn, mit
konkreten Beispiele für ein PtRh-Pt Thermoelement.
Cuvinte cheie: termocupluri în exploatare, rezistenţa electrică
Schlüsselwörter: Thermoelementen in Betrieb, elektrische Widerstand
79 EINIGE FRAGEN BEZÜGLICH DES ELEKTRISCHEN WIDERSTANDS VON THERMOELEMENTEN
STUDIU COMPARATIV AL STĂRII DE DEFORMAȚII PENTRU
DESIGNUL ÎNVELITORII SFERĂ-CILINDRU GRP SUB
PRESIUNE INTERNĂ
Acest articol prezintă un studiu relativ la deplasarea totală a unei
învelitori cilindru-sferă GRP de grosime constantă supusă unei presiuni interne,
comparativ cu deplasarea totală pentru opt profile optimizate ale aceluiași tip
de învelitoare supusă la aceeași presiune internă. Concluzia este că
deplasarea totală este mică pentru învelitoarea optimizată prin metoda propusă
de autoare [4], pentru valoare minimă a tensiunii echivalente von Mises
semnalată la analiza stării de tensiuni, deplasarea totală δ*max cylinder =
0,673 mm reprezentând aproximativ jumătate din valoarea deplasării totale
pentru învelitoarea neoptimizată δ i
maxcylinder = 1,244 mm.
This article presents a study relative to the total displacement of a
cylinder-sphere covers GRP constant thickness subjected to internal pressure, as
compared to the total displacement profiles optimized for eight of the same type of
parcel subject to the same internal pressure. The conclusion is that the total
displacement is small for optimized by method of covering proposed by author [4],
for the minimum value of the voltage equivalent to von Mises condition analysis of
reported tensions, the total displacement δ*max cylinder = 0.673 mm representing about
half of the total displacement no optimization δ imaxcylinder = covering 1.244 mm.
Cuvinte cheie: deplasare totală, învelitoare cilindru-sferă, GRP, profil
optimizat
Keywords: total displacement, covers the cylinder, the sphere, GRP,
optimized profile
OPTIMIZAREA ÎN CÂMP ELASTIC LINIAR A UNEI ÎNVELITORI
CILINDRU-SFERĂ GRP SUPUSĂ UNEI PRESIUNI INTERNE
CONSTANTE ŞI UNIFORME
Articolul prezintă un studiu cu privire la optimizarea unui profil de
învelitoare cilindru-sferă GRP (Glass Reinforsed Plastic), calculată în domeniul
elastic linear pentru o valoare mică de presiune constantă și uniformă. Se
prezintă rezultatele cercetărilor făcute de J.Leach [4] pentru câteva profile de
învelitoare, relativ la starea de tensiuni și deformaţii utilizând programul
BOSOR [4] bazat pe metoda diferenţelor finite. În continuare se prezintă
rezultatele cercetărilor făcute de autoare relativ la trei învelitori cilindru-sferă,
optimizate prin impunerea a trei tensiuni echivalente von Mises constante pe
întreaga învelitoare, utilizând metoda propusă de autoare [2] care are la bază
ecuaţiile de echilibru ale teoriei clasice în domeniul elastic linear. Analiza stării
de tensiuni și deformatii este realizată cu ajutorul analizei FEM utilizând
programul NASTRAN V4.0 [5], pentru cele trei situaţii de optimizare ale
învelitorii cilindru-sferă prin programul OPTIMISES [3] rezultate prin impunerea
a trei tensiuni echivalente von Mises σVme = 5 MPa, σVme = 9,007 MPa,
respectiv σVMe = 17,96 MPa.
La sfârșit se face o analiză cuprinzând rezultatele opţinute relativ la
tensiunile circumferenţiale, echivalente von Mises, și relativ la deplasarea
totală, pentru profilele optimizate, evidenţiind rezultatele obţinute prin metoda
propusă de Dora Florea [3].
The article presents a study about optimizing a parcel profile cylindersphere
GRP (Glass Reinforsed Plastic), calculated in linear elastic for a small
value constant and uniform pressure.
579
Cuvinte cheie: optimizare, design, tensiune echivalentă von Mises,
deplasare totală, GRP
Keywords: optimization, design, santers von Mises, total displacement,
GRP
STUDII DE TENSIUNI ŞI DEFORMAŢII PENTRU UN PROFIL
SFERĂ-CILINDRU GRP SUB DIFERITE ÎNCĂRCĂRI DE
PRESIUNE INTERNĂ
Articolul prezintă un studiu al stării de tensiuni și deplasări realizat cu
programul NASTRAN V4.0 pentru o învelitoare cilindru-sferă GRP optimizată
după metoda propusă de autoare [1] cu ajutorul programului OPTIMISIS [2]
pentru valoarea tensiunii echivalente von Mises σVM = 50 MPa și supusă
presiunii p = 4 MPa. Modelul de învelitoare optimizat a fost studiat pentru
presiunile de 0.4 MPa, 4 MPa și 40 MPa. Concluzia este ca valoarea tensiunii
echivalente von Mises σVM și deplasarea totală δt crește cu creșterea presiunii
dar valoarea tensiunii von Misses σVMo și deplasarea totală δto pentru modelul
optimizat sunt foarte mici in comparaţie cu valoarea tensiunii echivalente von
Mises și deplasării totale pentru aceleași încărcări dar pentru învelitoarea
cilindru-sferă neoptimizată și de grosime constantă t = 10 mm.
The article presents a study of the State of tension and displacements
with NASTRAN Software v4.0 for cylinder-sphere a GRP optimized after the
proposed method by the author [1] with OPTIMISIS [2] for the equivalent
voltage von Mises σVM = 50 MPa and subject to pressure of p = 4 MPa.
Cuvinte cheie: tensiune echivalentă von Mises, deplasare totală,
învelitoare sferă-cilindru GRP, metoda elementelor finite
587
Keywords: equal von Mises stress, displacement, covers the spherecylinder
GRP, finite elements method
CONSIDERAȚII DESPRE SISTEMUL DE
MANAGEMENT AL SIGURANȚEI AERONAUTICE
The present paper regards elements about safety management
system and maintenance in civil and military aeronautical field. All organization
must correlate the minimum risk with higher performance in their specific
activity.
Lucrarea de faţă analizează elementele ce privesc sistemul de
management al siguranței și întreținere în domeniul aeronautic civil şi militar. În
activitatea lor specifică, toate organizaţiile trebuie să coreleze un risc minim cu
performanţe superioare.
Keywords: maintenance, risk management, safety, costs
Cuvinte cheie: întreţinere, managementul riscului, siguranța, costuri
83 CONSIDERATION ABOUT AERONAUTICAL MAINTENANCE AND SAFETY MANAGEMENT SYSTEM
INFLUENCE OF GRAIN SIZE ON MECHANICAL
PROPERTIES OF Al2O3 – SiC COMPOSITES
Composite material of Al2O3/SiC was prepared by pressing Al2O3 and
SiC powders. The mechanical properties, including flexural strength,
compression strength, hardness, and resilience were studied. The amount of
SiC was 20, 30, and 40 vol. %. Sintering was done at 1650 oC for 1 h soaking
time in air. Porosity decreases as grain size of SiC is increasing. As increasing
the particle size the resistance of flexion decreases, the resistance of
compression is decreasing, HRA is highest for 20 % vol. SiC, and resilience is
highest for 40 vol.% SiC.
Keywords: Al2O3/SiC composites, flexural strength
Cuvinte cheie: compozite Al2O3/SiC, rezistenţă la încovoiere
ON SOME PARTICULARITIES OF FRETTING FATIGUE (II)
Fretting is a process which invariably occurs on contracting surfaces of
tightly metal joints subjected to vibration loading. The superficial damage caused
by the rubbing of the contacting surfaces together with the severe stress gradient
under the contact region accelerate the nucleation and early growth of cracks
witch can lead to catastrophic failure of there is a least one of the components of
the fitting subjected to a remote fatigue load. This is the so called fretting fatigue
phenomenal. The aircraft industry is per hops one of the most affected by the
fretting fatigue problem.
Cuvinte cheie: oboseală de fretting
Keywords: fretting fatigue
ON SOME PARTICULARITIES OF FRETTING FATIGUE (I)
Fretting is a process which invariably occurs on contracting surfaces
of tightly metal joints subjected to vibrational loading. The superficial damage
caused by the rubbing of the contacting surfaces together with the severe
stress gradient under the contact region accelerate the nucleation and early
growth of cracks witch can lead to catastrophic failure of there is a least one of
the components of the fitting subjected to a remote fatigue load. This is the so
called fretting fatigue phenomena. The aircraft industry is perhaps one of the
most affected by the fretting fatigue problem.
Cuvinte cheie: oboseală de fretting
Keywords: fretting fatigue
STUDY OF SPEED INCREASE OF THE CRACK
IN RELATION TO MATHEMATICAL MODEL PROPOSED
It has been carried out a study of the crack propagation rate in testpieces
with flat model CT, with side notch, from a 10TiNiCr175 mark stainless,
by three known variants: polynomial method according to ASTM 647-95, Paris
method and Forman method. It was examined the influence of temperature
variation to low values, for an axial cyclic eccentric strain. Asymmetry coefficient
by working was R = 0,3, and the temperatures T = 293 K, T = 253 K,
respectively T = 213 K.
Cuvinte cheie: solicitare ciclică, coeficient de asimetrie, fisură, viteză
de fisurare, factor de intensitate a tensiunii
Keywords: application cyclical asymmetry coefficient, crack, crack
speed, voltage intensity factor
METODHS FOR DETERMINING THE RESISTANCE
TO FATIGUE – II
Although the total number of parts that break during service is not
great, however over 50 % of the breaks are caused by fatigue cracking or
corrosion fatigue, and so is of a great importance the knowledge and mastery
of this phenomenon.
The present work contains both a summary of methods for
determining the resistance to fatigue and also the procedures for determining
the coefficient of safety in different situations.
Cuvinte cheie: durabilitate, rezistență, oboseală, diagramă
Keywords: durability, resistance, fatigue, diagram
CONSIDERATIONS REGARDING THE NECESSITY OF
FATIGUE APPROACH ON DIFFERENT SCALES.
FATIGUE MESOSCOPIC (III)
An extensive literature review is presented in this paper, composed of
several parts, regarding the present-day topic of mesoscopic fatigue of
materials. This subject is scarcely represented in the literature from our country.
The authors present a short and accessible approach in order to
familiarize research and production engineers with the new aspects of fatigue
calculation based on the transition from macro to meso scale. Mesoscopic
fatigue takes into account the material’s behavior at the level of crystal grains.
Cuvinte cheie: oboseală, număr cicluri, macroscopic, mesoscopic
Keywords: fatigue, number of cycles, macroscopic, mesoscopic
CONSIDERATIONS REGARDING THE NECESSITY OF
FATIGUE APPROACH ON DIFFERENT SCALES.
FATIGUE MESOSCOPIC (II)
An extensive literature review is presented in this paper, composed of
several parts, regarding the present-day topic of mesoscopic fatigue of
materials. This subject is scarcely represented in the literature from our country.
The authors present a short and accessible approach in order to
familiarize research and production engineers with the new aspects of fatigue
calculation based on the transition from macro to meso scale. Mesoscopic
fatigue takes into account the material’s behavior at the level of crystal grains.
Cuvinte cheie: oboseală, număr cicluri, macroscopic, mesoscopic
Keywords: fatigue, number of cycles, macroscopic, mesoscopic
CONSIDERATIONS REGARDING THE NECESSITY OF
FATIGUE APPROACH ON DIFFERENT SCALES. FATIGUE
MESOSCOPIC (I)
An extensive literature review is presented in this paper, composed of
several parts, regarding the present-day topic of mesoscopic fatigue of
materials. This subject is scarcely represented in the literature from our country.
The authors present a short and accessible approach in order to
familiarize research and production engineers with the new aspects of fatigue
calculation based on the transition from macro to meso scale. Mesoscopic
fatigue takes into account the material’s behavior at the level of crystal grains.
Cuvinte cheie: oboseală, număr cicluri, macroscopic, mesoscopic
Keywords: fatigue, number of cycles, macroscopic, mesoscopic
AN ASPECT OF ESTIMATING OF THE FRACTURE
TOUGHNESS δc
Between main characteristics, praising the fracture toughness of
materials, there are different relations. The present paper is praising some
difficulties which concerning the fracture toughness, on the basis of a method
which allow to estimate another characteristic, much easy to determine.
Cuvinte cheie: tenacitate la rupere, caracteristici mecanice,
temperatură
Keywords: fracture toughness, mechanical properties, temperature
REVERSE ENGINEERING OF A KNEE IMPLANT
The objective of the application is to describe the reverse engineering
stages to transform a real knee implant into a virtual geometry, using the
Noomeo Optinum 3D scanner, Numisoft and Rapidform XOR3 software.
Cuvinte cheie: inginerie inversă, scanner 3D, implant
Keywords: Reverse Engineering, 3D scanner, implant
DETERMINATION OF SENSITIVITY OF A NEW MINIATURE
FIBER OPTIC PRESSURE SENSOR FOR MEDICAL
APPLICATIONS, AN OPPORTUNITY FOR THERAPY AGAINST
INTRA-AORTIC PULSATION
The paper presents a miniature fiber optic pressure sensor for medical
applications, based on Fabry-Perrault White Light Interferometry and a method
for determining the sensitivity of a new sensor.
Cuvinte cheie: sensor, sensibilitate, fibră optică
Keywords: sensor, sensitivity, fiber optics
STRESSES AND DEFORMATIONS IN FARMING
OF WOOD RAFTER CAUSED BY SNOW WEIGHT
This paper analyses the stresses and deformations in farming of wood
rafter caused by snow weight. The finite element method was used to
determine stresses and deformations. Were analyzed several variants of
dimensional framing.
Cuvinte cheie: şarpantă, căpriori, tensiuni, deformaţii
Keywords: sloping, roof, stress, strain
STRUCTURAL STRENGTH DESIGN AND VERIFICATION OF
AN OFF-ROAD, “BUGGY” TYPE AUTOMOBILE
Within the current paper the author presents the results of the
structural strength analysis, made for the design and verification process of an
off-road, “buggy” type automobile.
The main technical characteristics for the new lightweight automobile,
that was designed, were set by the comparative analysis of different
constructive variants of this type of automobiles that have already been made.
The structural strength of the „buggy” was verified by a calculation
using the finite element method. The paper presents the values of the strains
and displacements obtained by running the program for the loading cases that
have been considered.
Cuvinte cheie : autoturism tip Buggy, structura de rezistenţa, metoda
elementelor finite
Keywords: Buggy car type, structure, strength, finite element
THE SAFETY IN EXPLOITING METALLIC
CONSTRUCTIONS
The paper analyses the safety in exploiting metallic constructions. In
order to verify the limit conditions, corrections were introduce by using some
dimensionless numerical coefficients, determined for each analyzed limit
condition, which will cover unfavorable influences of different factors.
Cuvinte cheie: siguranţă, stare limită, coeficienţi, îmbinare
Keywords: safety, level measurement, ratios, jointing
EXPERIMENTAL DEVICE FOR PERFORMING
TRIALS RELATED TO CREEP
This paper aims at presenting an experimental device, used for
performing trials related to creep. The device belongs to the Strength of
Materials Laboratory within the Faculty of Engineering Hunedoara.
Cuvinte cheie: fluaj, încercare mecanică, temperatură
Keywords: creep, mechanical testing, temperature
EVOLUTION OF RESIDUAL STRESSES – PART II
Abstract: In this paper, the authors study the residual stresses that
arise in a stress lattice during casting. The residual stresses are firstly
determined experimentally and secondly simulated using a numerical method
(control volume) for method validation.
Cuvinte cheie: tensiuni remanente, proba rețea de contracție, turnare,
simulare numerică
Keywords: residual stresses, stress lattice, casting, numerical
simulation
EVOLUTION OF RESIDUAL STRESSES
Part I
In this paper, the authors study the residual stresses that arise in a
stress lattice during casting. The residual stresses are firstly determined
experimentally and secondly simulated using a numerical method (control
volume) for method validation.
Cuvinte cheie: tensiuni remanente, proba rețea de contracție, turnare,
simulare numerică
Keywords: residual stresses, stress lattice, casting, numerical
simulation
TYPES ON CONSTRUCTION AND TECHNICAL
CHARACTERISTICS OF WAGONS USED
TO INDUSTRIAL RAILWAY
This paper aims to study of the constructive and technical
characteristics, the mostrepresentative freidht cars used in rail wagons found
this plant on 2 and 4 axles.
Cuvinte cheie: vagoane de marfă descoperite, cale ferată uzinală,
sarcini, tensiuni, deformaţii
Keywords: freight wagons discovered, railway plant, loads, stresses,
deformations
METHODS FOR DESIGN AND VERIFICATION OF
STRUCTURES OF RESISTANCE FROM RAILWAY VEHICLES
The girl is to analyse the methods of design and verification of
structures of resistance from railway vehicles used over time in railway
transport.
Cuvinte cheie: metoda elemntelor finite, material rulant, tensiuni,
deformaţii.
Keywords: method elemntelor finished, rolling, tension, strain
EXPERIMENTAL STRESS ANALYSIS WITH STRAIN
GAGES – MANDATORY REQUIREMENT FOR THE FINAL
HOMOLOGATION OF THE WAGONS
Experimental stress analysis with strain gages is used all over the world
from many years. In Romania we use as testing method from the steam
locomotive age. During the time, the standards were changed and the
measuring devices are more accurate. It is interested to understand why tests
are still necessary during homologation (certification) process.
Cuvinte cheie: tensometrie, încercări, statice, dinamice, vehicule
feroviare
Keywords: tensometers, testing, static and dynamic rail vehicles
VARIABLE GAUGE TRAINS A VIABLE
INTEROPERABILITY SOLUTION
In the last 20 years the Commission has been very active in
restructuring the European rail transport market and strengthening the position
of railways vis-à-vis other transport modes. Commission efforts have
concentrated on three major areas which are all crucial for developing a strong
and competitive rail transport industry: (1) opening of the rail transport market
to competition, (2) improving the interoperability and safety of national networks
and (3) developing rail transport infrastructure 0.
Cuvinte cheie: tren, ecartament, interoperabilitate, schimbător, Talgo
Keywords: train, track, interoperability, changing, Talgo
TANK WAGON’S LOAD INCREASING
The axle load for railway vehicle in Romania is 20 tones. The trend is to
increase the axle load from 20 to 22.5 tones. Because Romania is one of
European Union’s countries for Romanian’s railway vehicle owners it is
important to have modern vehicle able to run all over the Europe. The are many
countries in Europe where axle load is 22.5 tones (Austria, Germany, France
etc.).
Cuvinte cheie: cisternă, sarcină, modernizare, metoda elementelor
finite
Keywords: tank, load, modernization, finite element
RELEVANT PROCESS APPLIED HARDENING COIL
SPRINGS CYLINDRICAL RAILWAY VEHICLES
In the performance of helical springs, the surface residual stresses are
introduced: the outside bar tensile stress and compressive stress inside the
bar. They associated with a possible primer for cracks can lead to premature
rupture of the spring in use. To eliminate this drawback springs are subjected to
hardening treatment which is performed, usually with steel shot.
This paper aims highlighting the importance of the hardening process
applied coil springs to increase resistance to fatigue and lifetime.
Cuvinte cheie : ecruisare, arcuri, epruveta ALMEN, bile de otel (alice)
Keywords: hardening, springs, Almen specimen, steel balls (shot)
REFLECTIONS ON RAILWAY
VIBRATION VEHICLE SUSPENSIONS – II
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
REFLECTIONS ON RAILWAY
VIBRATION VEHICLE SUSPENSIONS – I
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
USING THE ALGOR SOFTWARE FOR DETERMINING THE
WRIST PIN BENDING FOR A DIESEL ENGINE
The paper introduces the steps of determining the wrist pin bending
for a diesel engine, based on the finite element analysis method, using Algor
software.
Cuvinte cheie: bolţ, elemente finite, încovoiere, motor diesel
Keywords: bolt, finite element, bending, Diesel
THE USE OF PHOTOELASTICITY IN ANALYZING THE STATE
OF STRESSES FOR THE STRUCTURE OF AN INDUSTRIAL
ROBOT. GENERAL CONSIDERATIONS
In this paper it’s presented, in general, the experimental study of the
structure of an industrial robot with five degrees of freedom. Using the
experimental method of photoelasticity, are determined the principal stress
difference and the distribution of stresses on the surface of entire structure of
the studied industrial robot.
Cuvinte cheie: experimental, fotoelasticimetrie, tensiuni, deformaţii,
robot, serial
Keywords: experimental, method of photoelasticity, stress, strain,
industrial robot, show
THE DAMAGE EFFECT ON DYNAMIC BEHAVIOUR OF
BEAMS
Structural Health Monitoring (SHM) for civil engineering applications
involves the use of sensing networks in order to diagnose damage in large
scale civil structures such as buildings, bridges, aircraft. SHM will result in large
savings in maintenance costs as well as improving life safety by providing a
real-time updating of a structure’s integrity.
Cuvinte cheie: defect, vibraţii, senzori, bară încastrată
Keywords: failure, vibration sensors, embedded bar
84 EFECTUL DEFECTULUI ASUPRA COMPORTĂRII DINAMICE A GRINZILOR
POLYETHYLENE SHOCK ABSORBER STRENGTH
SPECIFIC TESTS
Working on high structures is one of the jobs in the cities vertically
developed. The abilities of climb workers are used in purpose to mount publicity
banners, to clean building face, to mount objects on buildings etc.
The use of fall arrester equipment is made under strictly surveillance
and schooling of the workers because of imminence of the accidents. Before
sailing, the fall arrester equipment are tested and certificated.
Cuvinte cheie: încercări, polietilenă, MGC, tensometrie
Keywords: testing, polyethylene, GMC, tensometers
THE USE OF ARITHMETIC MEAN METHOD FOR
EXPERIMENTAL DATA PROCESSING
The paper presents an application of the arithmetic mean method
applied to experimental data processing gained from vibration measurement on
a SN400x1500 lathe in four manufacturing cycles and using four cutting
regimes for each cycle.
Cuvinte cheie: metodă, medii aritmetice, date experimentale, serii
bidimensionale
Keywords: method, arithmetic average, experimental data, twodimensional
series
MAJOR DIFFERENCES TO USE WASTE
IN BUILDING MATERIALS
Using waste properly and are very important mixing conditions the
vent so the strict observance of working conditions. In previous experiments
cork waste does not undergo thermal or physical and chemical transformations,
only a simple shredding process. Thus, the shredded cork is inserted in the
concrete mixture, partly replacing the aggregate. By means of this recycling
process, a major objective for sustainable development is confirmed –
improving environmental quality.
Cuvinte cheie: deşeuri, plută, beton, agregate, mărunţire, mediu,
rezistenţa de compresiune
Keywords: waste, cork, concrete, aggregate, grinding, medium
compressive strength
USING WASTES IN BUILDING MATERIALS
Using waste (especially those of organic nature) are a success for
both construction and environment. In previous experiments cork waste does
not undergo thermal or physical and chemical transformations, only a simple
shredding process. Thus, the shredded cork is inserted in the concrete mixture,
partly replacing the aggregate. By means of this recycling process, a major
objective for sustainable development is confirmed – improving environmental
quality.
Cuvinte cheie: deşeuri, plută, beton, agregate, mărunţire, mediu,
rezistenţa de compresiune.
Keywords: waste, cork, concrete, aggregate, grinding, medium
compressive strength
DECREASING THE INTERVENTION TIME IN THE ANTI- HAIL
SYSTEMS THROUGH DECISION SUPPORT SYSTEM
This paper deals with the design of a system for decisional support
dedicated to an anti-hail system. It is proposed a specific system for Romania
anti-hail network, which completes the existing systems with specific
information in order to identify the best solutions for both coordination and
launch. The main methods of combating hail are related to the seeding clouds
with rockets, artillery and aircraft, the use of canon shock wave, ground particle
generators and anti-hail nets. The system comprises two main components: a
subsystem of launch decision and a subsystem for assisting the launch
decision. In order to achieve this system, the following important issues are
considered: the use of communication via GPRS, monitoring the parameters
throughout all period of operating, log-values, status and alarms, operator
actions logs, friendly graphical interface and the generation of tabular and
graphical reports for any period. The system enables: an increased efficiency
by shortening the time for action, a good organization and a high degree of
security.
Cuvinte cheie: antigrindină, suport decizional, GIS, monitorizare
Keywords: hail, decision support, GIS, monitoring
RESEARCH ON SOLID POLYMER ELECTROLYTE
ELECTROLYSER OF THE FUEL CELL
This study analyzes the solid polymer electrolyte electrolyser of the
fuel cell, the theoretical model description and efficiency of the SPE fuel cell
water electrolysis and theoretical aspect of the Butler-Volmer equation. The
model description is used to understand the effects of the parameters on SPE
fuel cell water electrolysis. Recent studies have demonstrated the importance
of the current exchange at the anode chambers and the phenomena at the
anode membrane interface, which is the key point of the entire efficiency of
water electrolysis.
Cuvinte cheie: hidrogen, electroliza apei, SPE, electrolizor SPE,
Nafion
Keywords: hydrogen, water electrolysis, SPE, SPE electrolyser,
Nafion
THE EXPERIMENTAL INSTALLATION FOR THE STUDY ON
THE FORMATION OF HOT SMOKE AND GASES IN A
BURNING ENCLOSURE AND ON THEIR FLOW THROUGH
THE VENTILATION OPENINGS
This paper is an experimental proposal to view and analyze the movement
of smoke and hot gases and the formation of the smoke layer in a burning
enclosure, the latter depending on the degree of ventilation of the room,
thermal loading of the furnace and the thermal inertia of the enclosure. Inside a
sufficiently ventilated burning enclosure, two areas develop: the upper –
containing smoke and hot gases – and the lower one, containing relatively fresh
air. Experiments conducted in this research were primarily aimed at
demonstrating the basic theory that the thickness of the above layers depends
on the ventilation holes and the size of the firebox.
Cuvinte cheie: incendiu, fum, gaze fierbinți, strat de fum, ventilare
Keywords: fire, smoke, hot gases, smoke layer, ventilation
3D SIMULATION OF A FIRE IN SITUATION
IN BUCHAREST SUBWAY
The article presents the work of the authors concerning the 3D fire
simulation at a subway metro station in Bucharest, Romania. The subject is
very important, as in such a real case of fire in subway stations, large number
of casualties can occur.
Cuvinte cheie: 3D simulare, metrou, foc, simulare de incendiu
Keywords: 3D simulation, subway fire, fire simulation