Search results for "abstract"

showing 10 items of 1959 documents

Development of a high-accuracy PC-based wattmeter with commercial data acquisition boards

2011

This paper presents the development of a high accuracy sampling wattmeter, which makes use of two commercial data acquisition boards (DAQs) connected to a common personal computer. Commercial software is also used for data processing and implementation of the virtual instrument. The set up of the PC-based wattmeter is described and a preliminary evaluation of its metrological performances is made by means of two series of experimental tests, which were carried out with an electric power standard and a high performance multifunction calibrator. © 2011 IEEE.

EngineeringVirtual instrumentElectric power measurementPC-basedlaw.inventionSet (abstract data type)Data acquisitionSampling (signal processing)lawExperimental testElectronic engineeringMeasurement theorySampled data control systemsCommercial softwareData processingpower measurements data acquisition wattmeters power system measurements sampled data systems PC-based instrumentsVirtual instrumentationData acquisition boardbusiness.industryMetrological performanceWattmeterData handlingCommercial softwareElectric powerPersonal computersSampled data systemsPower qualityPower system measurementPersonal computerHigh-accuracyInstrumentsbusinessWattmetersSettore ING-INF/07 - Misure Elettriche E Elettroniche2011 IEEE International Instrumentation and Measurement Technology Conference
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A RELIABILITY MODEL FOR OPTIMAL ALLOCATION OF SPARE TOOLS IN FMS

1989

ABSTRACT A model for the dynamic management of the tool set of an FMS workstation is developed. The proposed approach processing the on-line recorded tool failure data updates the estimate of the parameters of the probability density functions of tool life and selects, at the occurence of each failure, the code of the tool to be allocated in the workstation storage devices in order to maximize its reliability over a planned horizon.

EngineeringWorkstationbusiness.industryProbability density functionlaw.inventionReliability engineeringSet (abstract data type)lawSpare partCode (cryptography)Optimal allocationbusinessReliability modelReliability (statistics)
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Discussion of “Simple Flume for Flow Measurement in Open Channel” by Zohrab Samani and Henry Magallanez

2002

This paper is a Discussion of “simple flume for flow measurement in open channel".

Engineeringbusiness.industryAgricultural and Biological Sciences (miscellaneous)Venturi flumeFlow measurementOpen-channel flowFlumeSimple (abstract algebra)Settore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliGeotechnical engineeringHydraulic machinerybusinessflume open channel flowWater Science and TechnologyCivil and Structural EngineeringJournal of Irrigation and Drainage Engineering
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Experimental test on a fuel cell powered brushless synchronous motor for automotive applications

2014

In this paper, a fuel cell powered motor emulator is proposed. The MATLAB/Simulink model including the fuel cell stack, the motor and drive models is described. The Urban Driving Cycle test is performed in MATLAB environment. Effective operating conditions of the whole fuel cell powered motor are accurately emulated according to actual regulations in force. The emulated current profile is used for experimental tests on a 5kW Nuvera PowerFlow stack. Thanks to the proposed approach, the motor and inverter drives are accurately emulated and the provided test-bench is used to evaluate performances of the stack under test for automotive applications. Simulation and experimental results are compa…

Engineeringbusiness.industryAutomotive industryautomotive fuel cell synchronous motor electric vehicles.Settore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciAutomotive engineeringStack (abstract data type)InverterFuel cellsbusinessMATLABSynchronous motorcomputerDriving cyclecomputer.programming_language3rd Renewable Power Generation Conference (RPG 2014)
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A Hybrid Machine Learning and Knowledge Based Approach to Limit Combinatorial Explosion in Biodegradation Prediction

2016

One of the main tasks in chemical industry regarding the sustainability of a product is the prediction of its environmental fate, i.e., its degradation products and pathways. Current methods for the prediction of biodegradation products and pathways of organic environmental pollutants either do not take into account domain knowledge or do not provide probability estimates. In this chapter, we propose a hybrid knowledge-based and machine learning-based approach to overcome these limitations in the context of the University of Minnesota Pathway Prediction System (UM-PPS). The proposed solution performs relative reasoning in a machine learning framework, and obtains one probability estimate fo…

Engineeringbusiness.industryContext (language use)Machine learningcomputer.software_genreRandom forestSet (abstract data type)Transformation (function)Domain knowledgeSensitivity (control systems)Artificial intelligencePrecision and recallbusinesscomputerCombinatorial explosion
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Integrated Mathematical Model of Proton Exchange Membrane Fuel Cell Stack (PEMFC) with Automotive Synchronous Electrical Power Drive

2008

In this work, the mathematical dynamical model of a PEMFC stack has been developed and implemented in Matlab environment. Lots of simulations have been executed in two different load conditions. Firstly with a resistive load and finally with a synchronous electrical power drive in automotive load conditions. The innovation in this field consists in the integration in PEMFC stack mathematical dynamic model of a synchronous electrical power drive one for automotive purposes. As regards the simulations with a synchronous electrical power drive, the complete mathematical model allows to evaluate the PEMFC stack performances and electrochemical efficiency. This represents a useful design tool.

Engineeringbusiness.industryDesign toolAutomotive industryProton exchange membrane fuel cellAutomotive engineeringVehicle dynamicsStack (abstract data type)Electric powerbusinessSynchronous motorMATLABcomputercomputer.programming_language
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Lay-up optimization for the hull of a racing sailing yacht

2001

Abstract Deformability and buckling load of yacht hulls with fiber reinforced plastic sandwich structure depend on the stack sequence of the skins. In this work an optimization of fiber directions of the laminae for a racing yacht is proposed. This procedure has been divided into three parts (i.e. material characterization, surface model definition, lay-up optimization). First of all a set of unidirectional specimens has been realized, by using the same fibers and matrix (carbon/epoxy) used for the hull as well as the same procedure and workers, in order to characterize the material according to American Society for Testing and Materials (ASTM) Standard D3039, employing strain gage techniqu…

Engineeringbusiness.industryGeneral EngineeringComputational MechanicsStructural engineeringFibre-reinforced plasticFinite element methodSoftware; Computational MechanicsMatrix (mathematics)Stack (abstract data type)BucklingHullComputational mechanicsbusinessStrain gaugeSoftware
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A structured filter for Markovian switching systems

2014

In this work, a new methodology for the structuring of multiple model estimation schemas is developed. The proposed filter is applied to the estimation and detection of active mode in dynamic systems. The discrete-time Markovian switching systems represented by several linear models, associated with a particular operating mode, are studied. Therefore, the main idea of this work is the subdivision of the models set to some subsets in order to improve the detection and estimation performances. Each subset is associated with sub-estimators based on models of the subset. In order to compute the global estimate and subset probabilities, a global estimator is proposed. Theoretical developments ba…

Engineeringbusiness.industryMarkovian switching systemMode (statistics)Linear modelEstimatorComputer Science Applications1707 Computer Vision and Pattern RecognitionFault detection and isolationActive mode detectionComputer Science ApplicationsTheoretical Computer ScienceSet (abstract data type)Vehicle roll dynamicActive mode detection; Markovian switching system; Multiple model estimation; Vehicle roll dynamic; Control and Systems Engineering; Theoretical Computer Science; Computer Science Applications1707 Computer Vision and Pattern RecognitionControl and Systems EngineeringFilter (video)Control theoryMultiple model estimationState (computer science)businessSubdivisionInternational Journal of Systems Science
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A Simple Model for the Axial Thrust in V-Belt Drives

1996

Simple formulas can relate axial thrust and torque of rubber V-belt drives, taking into consideration the radial penetration of the belt.

Engineeringbusiness.industryMechanical EngineeringNumerical analysisAxial thrustThrustMechanicsMechanical driveBelt driveComputer Graphics and Computer-Aided DesignComputer Science ApplicationsNatural rubberMechanics of MaterialsSimple (abstract algebra)visual_artForensic engineeringvisual_art.visual_art_mediumTorquebusinessJournal of Mechanical Design
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Developing a Knowledge Base about the Technological Forces within the Asymmetric Incremental Forming Process

2015

Asymmetric single point incremental forming (ASPIF) has been recognized as a solution with potential in manufacturing small batches or single sheet metal parts. The approach presented in this paper presents the development of a knowledge base regarding the values of the technological force within the ASPIF process and the influence of some technological parameters such as feed, speed of the punch, thickness of the part and step, upon them. The method is based on the use of the information provided by the CNC machine sensors. Relationships between the torques developed by the drive motors on each axes and the technological forces will be set in order to refine the raw information displayed o…

Engineeringbusiness.industryMechanical EngineeringProcess (computing)Mechanical engineeringForming processesUSableSet (abstract data type)Knowledge baseMechanics of Materialsvisual_artNumerical controlvisual_art.visual_art_mediumTorqueGeneral Materials SciencebusinessSheet metalKey Engineering Materials
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