Tiberiu MĂNESCU jr.


32-60 STUDIUL STĂRII DE TENSIUNI ȘI DEFORMAȚII ALE ROLELOR DE RULMENT PRIN MODELARE CU METODA ELEMENTELOR FINITE

STRESS AND STRAIN STUDY OF THE ROLLER BEARINGS USING FEM METHOD

 

This paper aims to study the stresses and strains that occur in small radial bearings with rolls of Æ 7,5×15 mm diameter. We have considered five-speed charging for two distinct cases: without and with defects.

 

Keywords: roller bearing, contact voltage, strain, roll flange

Cuvinte cheie: rulment radial, tensiune de contact, deformație, rolă-placă plană

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30-54 POLUAREA SONORĂ ÎN AUTOVEHICULE. STADIUL ACTUAL

NOISE IN MOTOR VEHICLES -CURENT STATUS
In contrast to many other environmental problems, noise pollution
continues to increase thanks to industrial, social and transportation field
development. The paper analyzes specific aspects on the impacts of noise on
health, to identify areas for priority action and remediation measures.
Keywords: stage, vibroacustical, sound level meters
Cuvinte cheie: stadiul actual, vibroacustica, sonometre

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30-53 EXAMINAREA EXPERIMENTALĂ A COMPORTĂRII CAROSERIILOR AUTOVEHICULELOR DE TRANSPORT DE PERSOANE

EXPERIMENTAL EXAMINATION OF THE BEHAVIOR
OF PASSENGER VEHICLE BODIES
It can be affirmed that the movement has emerged with the advent of
motor transport. If the early use of these means of transport, traffic accidents is
produced with low frequency, at the present time, due to the unprecedented
increase in traffic, traffic accident has become an acute social problem. As a
result, over time, it has acted in the following three major directions: the traffic
Regulation by a legal system, increase the level of performance of active safety
provided by the motor vehicle, increasing the level of passive safety
performance ensured by the motor vehicle.
Keywords: experimental examination, bodywork, vehicle
Cuvinte cheie: examinarea experimentala, caroserie,
autovehicul

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29-90 ANALIZA TENSIUNILOR ȘI DEFORMAȚIILOR LA ȘASIUL UNUI VAGON DE MARFĂ CU PEREȚI ÎNALȚI ÎN URMA UNOR LUCRĂRI DE REPARAȚIE ȘI CONSOLIDARE

ANALYSIS OF TENSIONS AND DEFORMATIONS TO THE
CHASSIS OF A FREIGHT WAGON WITH HIGH WALLS
AFTER CONSOLIDATION AND REPAIR WORKS
This paper checks by the finite element method the solution to
strengthen the chassis of a boxcar with high walls in the process of corrective
and predictive maintenance railway vehicles run scheduled ungass works
inspections and repairs in order to keep running optimally or improved and
increase transport capacity correlated with the life extension of the rail vehicle
Keywords: freight wagon loads, stresses, strains, maintenance
Cuvinte cheie: vagoane de marfă, sarcini, tensiuni, deformaţii,
mentenanţă

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29-85 DIMINUAREA DEFECTELOR CE APAR ÎN PROCESUL DE FABRICAȚIE AL ROLELOR DE RULMENT

SHRINKING FAILURE OCCURRING MANUFACTURING
PROCESS OF ROLLER BEARINGS
This paper contains a brief overview of the flow of production of roller
bearings that equip radial model practiced by the firm INA/Germany. The focus
is on defects occurring in different phases that are unusable respective rolls. Is
a case study and propose a method of reducing the defects reported
Keywords: radial roller bearing, INA/Germany, polishing process
Cuvinte cheie: rulment radial cu role, INA/Germania, procedeu de
lustruire

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29-84 DEFECTE SEMNALATE LA LAGĂRELE DE ROSTOGOLIRE ÎN TIMPUL EXPLOATĂRII

FAULTS REPORTED TO CAMPS ROLLING IN SERVICE
This paper contains a brief overview of defects occurring in rolling
bearings during operation. Currently, design and manufacture various types of
bearings concerned several production units worldwide. The first three
prestigious companies in Europe are: SKF / Sweden, SNR / France and INA /
Germany. Replacing sliding bearings with roller bearings is made in the context
of the cruising speeds of vehicles grow continuously and need that from stage
design to ensure maximum safety during operation thereof by eliminating
possible defects that can occur.
Keywords: bearing, faulty operation, prestigious companies
Cuvinte cheie: rulment, defecte în exploatare, firme de prestigiu

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29-83 STUDIUL STĂRII DE TENSIUNI ŞI DEFORMAŢII CE APAR ÎN ROLELE DE RULMENT DE DIMENSIUNI MICI ÎN TIMPUL CONTACTULUI DINTRE CAPUL ROLEI ŞI GENERATOARE CÂND UNGHIUL DE IMPACT ESTE CUPRINS ÎNTRE 0° ÷ 60°

THE STUDY OF STRESS AND STRAIN OCCURRING IN
SMALL BEARING WHEELS DURING THE CONTACT
BETWEEN THE HEAD PULLEYS AND GENERATING THE
ANGLE OF IMPACT IS BETWEEN 0° ÷ 60°
The paper presents comparative way using numerical techniques for
modeling dynamic physical phenomena occurring at impact between two rolls
with a diameter of 16 mm in several distinct situations to clash head –
generating at an angle to an angle between 0° ÷ 60°. Analyzed situations occur
frequently in the manufacturing of cylindrical rollers that equip small radial
bearings.
Keywords: cylindrical roller, impact, stress, displacement
Cuvinte cheie: rolă cilindrică, impact, tensiuni, deformaţii

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29-51 INFLUENŢA FACTORILOR EXTERNI ASUPRA PEREŢILOR BATARDOURILOR METALICE DESTINATE PROTEJĂRII RÂURILOR ÎN CAZ DE DEZASTRE NATURALE

THE INFLUENCE OF THE EXTERN FACTORS ONTHE WALLS
OF THE METALLIC BULKHEADS FOR PROTECTING THE
RIVER IN CASE OF NATURAL DISASTERS
The paper aims to influence of a specific factors in case of flood (flow,
the flow rate of water) concerning the walls of the metallic bulkheads used for
protecting the banks of the rivers
Keywords: bulkhead, flood, flow, flow rate, distortion walls
Cuvinte cheie:batardou, inundaţii, debit, viteză, deformaţii pereţi

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17-45 EVOLUłIA STANDARDELOR SI A REGLEMENTĂRILOR PRIVIND DIAGNOSTICAREA VIBROMECANICĂ A MASINILOR INDUSTRIALE

EVOLUTION OF STANDARDS AND SETTLEMENTS
REGARDING VIBROMECHANICAL DIAGNOSIS OF
INDUSTRIAL MACHINES
Human need for comfort has led to the development, improvement and
diversification, amongst others, of industrial machines. This stage was
inevitably followed by the progress of maintenance and diagnostic systems,
with specific reference in this article at vibromechanical diagnosis systems. The
guidance that leads these achievements is represented by national,
international or regional standards and settlements. The industrial evolution
determined an evolution of standards and settlements that have undergone
considerably changes over time or have been abrogated and replaced with
some topical ones.
Cuvinte cheie: standarde, diagnoză, masini industriale , vibromecanic

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17-44 Simularea încercării de compresiune pe tampoane la un vagon cisternă cu ajutorul metodelor numerice

COMPRESSIVE BUFFER TEST SIMULATION FOR A TANK WAGON USING NUMERICAL METHODS
The numerical methods are used for railway vehicles design. Before
manufacturing, the virtual model of the wagon can be performing a finite
element analyses in purpose to improve the design. But, one of the error
sources during finite element analyses can be how the loads are applied.
Cuvinte cheie: vagon cisternă, elemente finite, Ansys, forte

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25-82 UZURA BILELOR DE RULMENT ÎNCERCATE LA OBOSEALĂ

WEAR AND TEAR OF FATIGUE-TESTED
BEARING BALLS
The bearing balls with the 12.7 mm diameter equipping radial bearings
were tested for the fatigue endurance stress. The test was performed on a
specialised machine, which creates a constant force during testing, at a number
of revolutions that is also constant. By weighing and dimensional
measurements we find a mass loss after the fatigue test, and implicitly the
diameter became smaller due to wear and tear.
Keywords: bearing ball, fatigue testing, ball wear and tear
Cuvinte cheie: bila de rulment, de oboseală, uzura bilei
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25-81 ANALIZA DIMENSIONALĂ ȘI CALITATIVĂ A SUPRAFEȚELOR BILELOR DE RULMENT ÎNCERCATE LA OBOSEALĂ

DIMENSIONAL AND QUALITATIVE ANALYSIS OF THE
SURFACE OF FATIGUE-TESTED BEARING BALLS
During the fatigue testing of bearing balls, subjected to compression at
constant force and number of revolutions, we find, from the technological point
of view, certain micron-sized alterations in relation with the dimensions and
quality of the tested balls’ surface. The main parameters refer to the ball
diameter [mm] and the number of revolutions affected by the machine during
testing [number of revolutions]. The contact during testing is sphere to plane.
Keywords: bearing ball, fatigue testing, roughness
Cuvinte cheie : bilă rulment, încercare de oboseală, rugozitate
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25-80 ANALIZA DURATEI DE VIAȚĂ A BILELOR DE RULMENT DE DIMENSIUNI MICI

ANALYSIS OF ENDURANCE LIFETIME FOR
SMALL BEARING BALLS
In order to determine the lifetime of bearing balls we need to proceed
to their fatigue test. The machine for fatigue testing has a special construction,
with several spaces for simultaneous tests. The contact between the ball to test
and the plate is plane. During the test, the machine’s number of revolutions and
the loading force are constant. An important parameter during testing is
represented by the environment conditions (with or without lubrication).
Keywords: bearing ball, fatigue test, endurance, lifetime
Cuvinte cheie: bila rulment; încercare la oboseală; durata de viață
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21-110 ASUPRA UNOR PARTICULARITĂŢI ALE OBOSELII DE FRETTING (II)

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

110 ASUPRA UNOR PARTICULARITĂŢI ALE


21-109 ASUPRA UNOR PARTICULARITĂŢI ALE OBOSELII DE FRETTING (I)

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

109 ASUPRA UNOR PARTICULARITĂŢI ALE


21-83 ÎNCERCĂRI SPECIFICE DE REZISTENŢĂ LA AMORTIZOARE DE ŞOC DIN POLIETILENĂ

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

83 ÎNCERCĂRI SPECIFICE DE REZISTENŢĂ LA