Căutare după Subiect "vibration"
Afișează articolele 1-20 of 22
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About Concrete Consolidation and Vibration
(Universitatea "Dunărea de Jos" din Galați, 2004)Proper vibration of fresh concrete is an important process in order to ensure optimum strength, durability, and appearance of quality precast products. Accepted practices in the precast industry are unique in some respects ... -
About the Vibrations of the Mechanical Systems with Non-Linear Damping
(Universitatea "Dunarea de Jos" din Galați, 2009)This work will analyze the non-linear vibrations of the mechanical systems, actually the ones with non-linear damping. If we consider damping F( x,x ) x( k k x );k1,k2 R 2 = − 1 − 2 Î & & & then the differential ... -
Characterization of Bearings Nonlinearities Influences on Viaducts Dynamic Responses
(Universitatea "Dunărea de Jos" din Galați, 2012)In view of viaducts designing and safety exploitation it is necessary to evaluate both theoretically, and instrumentally the dynamic behaviour for impulsive external actions. In this study the dynamic response for a ... -
Damage Detection at Vibration Passive Isolation Devices
(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
(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 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: ... -
Experimental Study of the Air-Jet Stem Generator
(Universitatea "Dunărea de Jos" din Galați, 2015)Applications of sound and ultrasound air-jet stem generators became of great interest in heat and power engineering, in environmental protection, in the production of heat insulating material, extraction of poor uranium ... -
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 ... -
Influence of the Behavior of Nonlinear viscoelastic Systems Bearing on the Dynamic of Bridge Structures
(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 ... -
Measuring and Controlling of Noises and Vibrations Generated by Industrial Sources
(Universitatea "Dunărea de Jos" din Galați, 2008)This paper describes a methodology for measuring and control of noises and vibrations generated by industrial sources, such as: construction activities, equipments which use vibrations into working process, etc. ... -
Melting-Casting Plant Using Vibrating of Melts in Order to Obtain Composite with Tehnological Utility
(Universitatea "Dunărea de Jos" din Galați, 2010)This paper presents the obtaining of composites materials with technological utility through vibration technology. In order to obtain these composites, and plant was designed and manufactured. In order to show the ... -
Periodic Solutions of Some Differential Equations that Show the Non-Linear Vibrations of the Mechanical Systems
(Universitatea "Dunarea de Jos" din Galați, 2009)Many phenomenons of mechanical nature possess non-linear vibrations, their mathematical forming operation leading to differential equations or to systems of differential non-linear equations. In this work it is shown ... -
Quantification of the Dynamic Response of a Viaduct Loaded by Shocks from Road Traffic
(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 ... -
Research About the Vibration Parameters for a Cold Rolling Mill Machine
(Universitatea "Dunărea de Jos" din Galați, 2006)By using the equipments of vibration measurement we can fight against the damages (strip undulation and thickness variation on the length) who is show in while of mill work. The amplitude of vibration parameters determine ... -
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 ... -
The Analytical Exact Solutions of Non-Linear Differential Equations Which Describe the Parametric Free Vibrations of Mechanical Systems
(Universitatea "Dunărea de Jos' din Galați, 2010)The movements of many material systems can be described by differential equations that have coefficients that depend on time. It is difficult to determine the solutions of these equations. Although many concrete problems ... -
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 ... -
The Parametrical Free Vibrations of Elastic Systems, the Analytical Exact Solutions
(Universitatea "Dunărea de Jos" din Galați, 2012)The movements of many material systems can be described by differential equations that have coefficients that depend on time. It is difficult to determine the solutions of these equations. Although many concrete problems ... -
Theoretichal Considerations about the Maximum Vibration Limits for Wheel Loader Affected by the Ground Conditions
(Universitatea "Dunarea de Jos" din Galaţi, 2003)In this paper, the author make a study of vibration (vertical acceleration) into wheel loader who is affected by the ground conditions. It is known from many studies and investigations, that the drive vibrations are ... -
Urban Pollution Issues Generated by Trams Traffic
(Universitatea "Dunărea de Jos" din Galați, 2015)The modern society development involves new and diverse issues considering urban environmental pollution. Traffic generated sound and vibration are two upto- date urban environmental pollution causes besides air and water ...