Search results for "Servo"

A mathematical model for wastewater modification processes assessment in a stabilization reservoir

2012

The paper presents a mathematical model for the simulation of the ecological status of a wastewater stabilization reservoir (WSR). WSRs are hypertrophic aquatic systems devoted to storage of water resources in warm countries where shortage conditions have quite often to be faced. Several factors that affect the stabilization reservoir effluent quality were taken into account: hydraulics and hydrology, solar radiation, atmospheric reaeration, algae, zooplankton, organic matter, pathogen bacteria, and sediment-water interaction. The model quantifies the specific influence of each factor on effluent quality, evaluating the correlation between the different considered factors. State variables i…

Indicateur visuel de l'état de fin de vie d'un réservoir composite

2013

National audience

Une méthode FE2 simplifiée appliquée à la modélisation de l'éclatement des réservoirs composites hautes pressions

2011

International audience; On propose dans cette étude la modélisation des phénomènes physiques à l'origine et induits par celui de rupture de fibre au sein d'un composite unidirectionnel. Cette modélisation, faite à l'échelle microscopique, permet de construire une base de données qui va décrire cette échelle au sein d'un procédé multiéchelles FE2 simplifié. Ce procédé est ensuite utilisé pour réaliser le dimensionnement à l'éclatement d'un réservoir composite bobiné.

Dynamique, diversité et adaptation des communautés microbiennes du sol en réponse à différents types de perturbations environnementales : influence d…

2009

Distribution de bactéries pathogènes dans les sols évaluée par PCR quantitative en temps réel

2009

National audience

Alppihiihdonopettajan toiminta hiihdonopetustunnilla

1997

Preventive Conservation: a Key Method to Ensure Cultural Heritage’s Authenticity and Integrity in Preservation Process

2012

This article studies the role of preventive conservation in cultural heritage preservation. It shows through cultural heritage theory and conservation professions development process how important part preventive conservation has had and still has in cultural heritage preservation and damage prevention. Preventive conservation is a multidisciplinary orientation that uses indirect measures and actions to avoid or to minimize future deterioration or loss of cultural heritage. Conservation professionals should recognize its importance as the most effective method in promoting the long-term preservation of cultural heritage. Therefore, preventive conservation should be the basic theoretical per…

Zawartość niektórych metali ciężkich w osadach dennych wybranych zbiorników retencyjnych

2005

Computer Simulation for the Study of CNC Feed Drives Dynamic Behavior and Accuracy

2007

In the application of CNC feed drives it is desirable to predict the servo performance. By using computer simulation techniques it is possible to construct an accurate model of the servo drive. This simulation procedure makes it possible to anticipate machine design problems and correct them. This paper deals with a model of a feed drive, which consists of a motion control system driven by a DC motor. Both position and velocity feedback loops are present in the structure of the system. By means of MATLAB & Simulink software, simulation diagrams were built in order to test the behaviour of the system. Experimental data are also presented in order to confirm the accuracy of the theoretical mo…

IMPROVING CNC MACHINE TOOLS ACCURACY USING MODELING AND COMPUTER SIMULATION TECHNIQUES

2007

Abstract The position was one of the first parameters that required the introduction of automatic control process. One of the most representative applications is represented by the feed drives of the computer numerically controlled (CNC) machine tools. Today, it is possible to use computer simulation techniques in analysing and synthesising position control systems. Thus, the behaviour of the CNC machine tools feed drives can be treated much more realistically. It is the purpose of this paper to show how simulation can be used to accurately represent, predict and improve the performance of a CNC machine tool feed servo drives.