Fascicula XIV
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©Universitatea "Dunărea de Jos" din Galați. Facultatea de Inginerie și Agronomie din Brăila
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Muffler Performances Modeling with Boundary Element - Method and Experimental Study
(Universitatea "Dunărea de Jos" din Galați, 2010)This paper investigates the acoustic performance of a reactive silencer using Boundary Element Method analysis and experimental techniques. This analysis addresses a research topic of major interest today on how to reduce ... -
Considetations on Using the Virtual Instruments for the Acquisition and Analysis of Experimental Data from Dynamic Systems
(Universitatea "Dunărea de Jos" din Galați, 2010)The new slogan “The software is the tool” takes into consideration a new construction principle for the measuring tools and systems, with a brand new architecture. These systems and tools are assembled into a “virtual ... -
Dynamical Response Analysis of a System with one Degree of Freedom Stresses by the Different Pulse Excitation Functions
(Univeritatea "Dunărea de Jos" din Galați, 2010)Viscoelastic systems embedded in structures such as bridges are subject to various dynamic loading from traffic. A dynamic study of these structures requires more accurate definition of disturbance function parameters: ... -
The Influence of Nonlinear the Elastic Character of Viscoelastic Systems on the Dynamic Response of Mechanical Systems
(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 ... -
Coandă Effect Used to Improve the Efficiency of a Rotary Wing Aircraft
(Universitatea "Dunărea de Jos" din Galați, 2010)Coandă effect is a well-known fluid mechanics phenomenon in which a jet flow attaches itself to a nearby surface and remains attached even when the surface bends away from the initial jet direction and the jet is deflected ... -
On the Product-Time and Cost Estimation in the Market-Manufacturing System
(Universitatea "Dunărea de Jos" din Galați, 2010)This paper presents a product time and cost estimation method taking account the market dynamics and manufacturing system competitiveness. The method is based on the behavioral modeling using on-line unsupervised learning. ... -
Seismic Protection of Structures Using Hydraulic Damper Devices
(Universitatea "Dunărea de Jos" din Galați, 2010)In recent years, much attention has been paid to the research and development of structural control techniques with particular emphasis on alleviation of wind and seismic responses of structures. Structural control in civil ... -
A Study of Body Posture on Human Comfort Under the Influence of Whole-Body Vibrations for the Rail Passengers
(Universitatea "Dunărea de Jos" din Galați, 2010)When traveling by train, passengers are exposed to vibration. A well designed seat will attenuate the vibration path to the person in the frequency region where it is the most perceptible, between 3 and 10 Hz. This paper ... -
Evaluating Methods of Whole-Body-Vibration Exposure in Trains
(Universitatea "Dunărea de Jos" din Galați, 2010)This paper studies the whole-body vibration in trains which constitutes one aspect of the physical environment that can cause discomfort to passengers. Modern methods of assessment use digital techniques. Accelerometers ... -
On the Efficiency of Compacting Equipment
(Universitatea "Dunărea de Jos" din Galați, 2010)In this paper, the efficiency of vibratory rammer during compaction is examined. A three-degree-of-freedom model has been established for analytical representation of the soil-rammer interaction. In the first approach, it ... -
Calculation Method of Straight Unsupported (Freely Deformable) Bars Subjected to in Plane Bending Stress
(Universitatea "Dunărea de Jos" din Galați, 2010)This paper describes a method of determining the cross section arrows and rotations of a straight unsupported bar subjected to bending stress. The straight bar is in a state of static balance while subjected to external ... -
Some Aspects of the Calculation of Beams Loaded with Mobile Forces with Variable Intensity
(Universitatea "Dunărea de Jos" din Galați, 2010)In this article is presented the case of the beams which are loaded by mobile forces with variable intensity along the beam. In this context, after calculus assumptions and calculus model are presented, necessary formulas ... -
Instrumental Analysis of the Reinforced Concrete Bridges Subjected to Dynamic Forced from the Traffic
(Universitatea "Dunărea de Jos" din Galați, 2010)This paper proposes an approach of the experimental study of the dynamics of a reinforced concrete bridge made by a number of twenty U beams and beared by eighty identical neoprene supports (four bearings for each concrete ... -
Modal Calculus of the Reinforced Concrete Bridges Modeled as a Rigid Solid Beared on Viscous Elastic Neoprene Supports
(Universitatea "Dunărea de Jos" din Galați, 2010)This paper proposes an approach of a six degree dynamic model of a rigidsolid with some types of symmetries. These symmetries lead to simplified mathematical models, which are more easily to solve. If the rigid-solid is ... -
The Undissolved Air Influences on Dynamic Behavior of Hydraulic Driving Systems
(Universitatea "Dunărea de Jos" din Galați, 2010)This paper is a part of a group of papers which deal with the changes due to the oil - air mixture into the hydraulic actuating systems. The undissolved air into the hydraulic agent of technological equipment actuating ... -
On the Correction Factor for Calibration of the Flowemeters with Axial Turbine
(Universitatea "Dunărea de Jos" din Galați, 2010)This paper refers to axial turbine flowmeters used for technical measurements of volumetric flows at hydraulic driving systems. This study demonstrates that volumetric flow through the transducer has proportional value ... -
Considerations on the Non-Linear Modelling of the Dynamics of the Vibration and Shock Isolators Made from Composite Neoprene
(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 ... -
Theoretical and Numerical Considerations on the Composite Neoprene Used at Vibration and Shock Isolation Isolators
(Universitatea "Dunarea de Jos" din Galați, 2010)Construction of passive insulation elements in neoprene single microstructure mixture has demonstrated that the isolators can have the necessary elastic characteristics but low internal damping. The reduced scale models ... -
Study on the influence of Sonic Generator Geometry on Acoustic Parameters
(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 ... -
Filter Signals a First Step in Interpreting Experimental Results
(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 ...
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