Căutare după Autor "1ddff5c0-88ea-4c9b-ba00-71e888093caf"
Afișează articolele 1-19 of 19
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An Original Solution for the Ground Support Mechanism of Compact Loaders
Petrea, Ioan; Leopa, Adrian (Universitatea "Dunărea de Jos" din Galaţi, 2003)This paper presents constructional solution adoption draftworking gear, loader IC 04, assure existence every tyre, reaction non-vanishing. The evidence profitability solution suspension draft. -
Analysis of the Dynamic Response to Stochastic Actions on the Tilting System of the Loader Bucket with Hydraulic Correlator
Petrea, Ioan; Leopa, Adrian (Universitatea "Dunărea de Jos" din Galați, 2004)The resistance encountered by the active organ – the bucket – of the loader when digging into the material pile is part of the category of external influences applied to the equipment. Generally this force is not constant ... -
Considerations on the Non-Linear Modelling of the Dynamics of the Vibration and Shock Isolators Made from Composite Neoprene
Bratu, Polidor; Leopa, Adrian (Universitatea "Dunărea de Jos" din Galați, 2010)This study presents the results of theoretical and experimental researches and numerical modeling for some composite material structures of neoprene used to manufacture the viscous-elastic supports of the technological ... -
Damage Detection at Vibration Passive Isolation Devices
Năstac, Silviu; Leopa, Adrian (Universitatea "Dunărea de Jos" din Galați, 2011)This paper deals with some theoretical aspects combined with experimental tests regarding early damage identification in vibroisolation devices. This study was a natural fall-back of an analysis regarding the behaviour ... -
Diagnostic of Structural integrity Using the Non-Linear Vibration
Leopa, Adrian (Universitatea "Dunărea de Jos" din Galați, 2007)The aim of the work presented here was to investigate the possibility of using hangs in the non-linear vibration characteristics to detect damage in mechanical structure. The nonlinearities were detected by examining the ... -
Dynamical Characterization Behavior of Machine Foundation whit Percussion Stresses Applied
Leopa, Adrian (Universitatea "Dunărea de Jos" din Galați, 2006)This paper presents a dynamical analyze on the foundation of machine when are apply stresses such the beat (percussion). In this way can be evaluate dynamical response of the structure, in our case foundation of machines, ... -
Filter Signals a First Step in Interpreting Experimental Results
Leopa, Adrian (Universitatea "Dunăread de Jos" din Galați, 2010)After recording and storage of experimental data, a first step in their processing is filtering, ie, removal of parasitic components (noise) accompanying the signal due from other machines or equipment in service or ... -
Influence of the Behavior of Nonlinear viscoelastic Systems Bearing on the Dynamic of Bridge Structures
Leopa, Adrian; Năstac, Silviu (Unioversitatea "Dunărea de Jos' dibn Galati, 2011)Modern structures of bridges and viaducts require dynamic isolation systems, designed to eliminate or mitigate the destructive effects of intense traffic and seismic activity on these constructions. This paper studies ... -
On the Rheological Behaviour of the soil in the Artificial Compacting Process
Oproescu, Gheorghe; Debeleac, Carmen; Leopa, Adrian; Năstac, Silviu-Marian (Universitatea "Dunărea de Jos" din Galați, 2008)The artificial compacting of the soil is made mostly with machines with dynamical action such as vibrating plate, vibrating beater or vibrating drum. Their effect on the compacting process of the soil has two origins: the ... -
Quantification of the Dynamic Response of a Viaduct Loaded by Shocks from Road Traffic
Leopa, Adrian (Universitatea "Dunărea de Jos" din Galați, 2012)The work in seismic design of bridges needs to develop physical models and mathematical theory, based on which will be assessed and quantified the dynamic response of bridge structures subjected to stress arising from ... -
Study on the influence of Sonic Generator Geometry on Acoustic Parameters
Ștefan, Anca; Leopa, Adrian (Universitatea "Dunărea de Jos" din Galați, 2010)The acoustical parameters, dimensional determination and construction of sonic generator is described in the paper. The generator’s dimensional determination and construction show that the nozzle slot, the axial resonator ... -
The Coefficient of Restitution in the Plastic Deformation Process
Drăgulin, Ichim; Leopa, Adrian (Universitatea "Dunărea de Jos" din Galați, 2004)In the analysis of dynamic processes and plastic deformation which appear on the forging and die forging equipments dint the shocks (forging hammers and screw presses), it is use frequently theoretical study of de collision ... -
The Dinamic Response Analysis of the Viaduct Supported on Anti Seismic Systems with Selective Links as Viscoelastic and Dry Friction Type
Leopa, Adrian (Universitatea "Dunărea de Jos" din Galați, 2013-10-01)This paper analyzes, on the theoretical level, the dynamic response of a viaduct section, dynamically isolated by systems with a selective type of links with viscoelastic and with dry friction. Evaluation of kinematic ... -
The Friction Force Dependence at Simple Pendulum Sliders by Relative Speed and Temperature of the Surface in Contact
Leopa, Adrian (Universitatea "Dunărea de Jos" din Galați, 2014)Some bridges located in areas of high seismic risk have the decks supported through simple pendulum what dissipates energy by dry friction. The friction force that occurs by motion of the two surfaces is dependent on both ... -
The Impulsive Loading Influence on Dynamic Response Parameters of the Viaduct Type Structure
Leopa, Adrian (Universitatea "Dunărea de Jos" din Galați, 2011)Bridges and viaducts are vital structures ensuring ways of communication, so they must be protected from dynamic loads from traffic or seismic activity. For this reason are embedded in their structure dynamic isolation systems ... -
The Influence of Nonlinear Behavior of Viscous-Elastic Element on Equipment Foundation with Dynamical Apply Stresses
Leopa, Adrian (Universitatea "Dunărea de Jos" din Galaţi, 2006)This paper presents a dynamical analyze on the foundation of machine when are apply stresses such the beat (percussion) in nonlinear behavior of the viscous-elastic elements hypothesis. In this way can be evaluate (more ... -
The Influence of Nonlinear the Elastic Character of Viscoelastic Systems on the Dynamic Response of Mechanical Systems
Leopa, Adrian (Universitatea "Dunărea de Jos" din Galați, 2010)Bridges and viaducts represent vital engineering structures which are component of terrestrial communication lines, therefore reducing their exposure to factor originating from natural or anthropogenic hazards has no ... -
The Model of the Forging Hammers Like System with three Degree of Freedom
Leopa, Adrian (Universitatea "Dunărea de Jos" din Galați, 2004)Forging hammers cause very high vibration levels, so vibration control is advisablein nearly all cases. For this reason, in present exist recearch with the object of to decrease and eliminate the shocks and vibration ... -
The Nonlinear Behavior Identification of the Dynamic Insulation Systems Used in Viaduct Structure
Leopa, Adrian (Universitatea "Dunărea de Jos" din Galați, 2012)Because of the destructive effects of seismic movements on bridges and viaducts, it was required to embed the structure of seismic devices with the role of maintaining structural integrity and post-seismic functionalit ...