Justinas Janulevicius, Lauryna Siaudinyte, Antanas Cenys, Nikolak Goranin
Current growth of usage of lT systems in almost every field of industry causes rapid optimization of production and maintenance of goods and processes. Nevertheless, wider usage of automated lT systems has it's drawbacks as well: while most of the lT solutions fully exist in an online environment, certain risks for assets stored within the systems exist. Diagnosing and measuring damages, generated by harmful events can have a strong impact on further evolution of the owners, therefore it is very important to assess the possible risks and requiring much expertise and estimating every possible...
TC10 Workshop 2013
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· 2013
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B. Aubert, J. Regnier, S. Caux, D. Alejo
This paper deals with an Extended Kalman Filter (EKF) based fault detection for inter-turn shortcircuit in Permanent Magnet Synchronous Generators (PMSG). A specific faulty model in d-q frame is developed to estimate the number of short-circuited turns which are used to a fault indicator setting up. Simulation results demonstrate the sensitivity and the robustness of the chosen indicator against various operation points on an electrical network.
TC10 Workshop 2013
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Giovanni Bucci, Fabrizio Ciancetta, Edoardo Fiorucci
In this paper, a testing system for the evaluation of the performance of innovative electromechanical drives for aircraft flaps is presented; it has been developed as a cooperation with the Umbra Group Aerospace. The research activity is focused on the design of the measurement system and on the development of the software for the measurement and the monitoring of mechanical, hydraulic and electrical parameters as well as the managing of the control system for the emulation of the load force opposing to the actuators movement. Innovative solutions based on the multithreading technique has...
TC10 Workshop 2013
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Wenyu Zhao, Edzel Lapira, Lodovico Menozzi
This presentation introduces signal processing techniques as applied to specific machine components with a focus on the output and use with prognostics technologies. With properly organized outputs, prognostics algorithms transform the fleet condition and health management challenge into a deployable fleet health management solution. This approach includes data and model driven failure patterns, sensory data connectivity from deployed assets, prognostics analytical applications, and advisory generation outputs which guide the asset owners and maintainers. To illustrate the concepts, a Wind...
TC10 Workshop 2013
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· 2013
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Diego Galar, Uday Kumar
A Centre has been created within Lulea University of Technology (LTU), with support from SKF, to examine the opportunities presented by developments in sensing and communication technologies in adding sensing and analysis functionality to rolling element bearings. One of the goals is the development of an artefact which closes the loop from sensing to actuation and taking advantage of all existing IT, mechanical and maintenance technologies.
TC10 Workshop 2013
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· 2013
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Yongping Han, Shahin Mehdizad Taleie, Tino Copani, Bertan Bakkaloglu, Sayfe Kiaei
A digital intermediate frequency (IF) to RF transmitter targeted for 2 GHz wideband code division multiple access (WCDMA) is presented. The proposed transmitter integrates a 3-level digital IF current-steering cell, an up-conversion mixer with a tuned load and an RF variable gain amplifier (RF VGA) with an embedded semidigital finite impulse response (FIR) reconstruction filter. A 4 th -order 1.5-b IF bandpass sigma delta modulator (BP ΣΔM) is designed to guarantee in-band signal-to-noise ratio (SNR) and error vector magnitude (EVM) performances while the out-of-band quantization noise due...
A. Baccigalupi, D. L. Carnì, D. Grimaldi, A. Liccardo
An experimental setup is pointed for the characterization of the output section of Arbitrary Waveform Generator (AWG). It is based on test method pointed out for high resolution Digital to Analog Converter. The output signal of the AWG under test is reconstructed by the zero crossing time sequence detected into the resulting signal obtained by subtracting the sinusoidal signal fed by reference AWG. The characterization of the output section of the AWG is carried out by analyzing this signal in time and frequency domain. Proper procedure is pointed out to evaluate the transfer characteristic...
Mario Luca Fravolini, Simone Fiani, Antonio Moschitta
This work presents a methodology that guarantees component-wise stability bounds for the states of a disturbed linear Multiple Input Multiple Output (MIMO) feedback control systems, featuring bounded uncertainties and bounded quantization errors both in the measurements and in the controls. The controller synthesis is based on the design of a robust invariant ellipsoidal set, which assumes that all the uncertainties sources introduce upper bounded signals. We show that the component-wise boundedness requirements for the states and controls of the closed loop uncertain system can be expressed...
Pasquale Napolitano, Antonio Moschitta, Paolo Carbone
In this work, the main sources of error affecting time interval measurements are analyzed and modeled. Time interpolation techniques utilizing both synchronous and asynchronous strategies to perform time measurements have been considered. Jitter on start and stop timing signals, interpolator nonlinearities, quantization error and jitter affecting the system clock driving the counter have been recognized as the main contributors to measurement uncertainty and their effects are analytically described. A deeper investigation on the cumulative effect of the clock jitter is discussed in order to...
Andrea Pugliese, Domenico L. Carni, Domenico Grimaldi
The impact of the settling behaviour of operational amplifiers (op-amps) used to implement switched-capacitor resonators on band-pass sigma-delta (BPΣΔ) modulator performance is investigated. Behavioural simulations of a second-order BPΣΔ modulator are performed by means of numerical models which allow the designer to well-describe high-order dynamics occurring in real op-amp circuit implementations. The results show that high-order poles and zeros in the resonator frequency response affect significantly the overall BPΣΔ modulator performances. In the paper, the effects of the resonator...