2,055 research outputs found

    In-Flight Wing Deformation Measurement System for Small Unmanned Aerial Vehicles

    Full text link
    Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/140711/1/6.2014-0330.pd

    Smart Automatic Power Factor Correction Device

    Get PDF
    This document will discuss on research and theory of the chosen topic for Final Year Project, which is Smart Automatic Power Factor Correction Device (PFCD). The objective of this project is to conduct study on the theory of power factor correction, application in industry and residential, simulate the circuit of power factor with different load, experimentally test the power factor concept and further improve it to a smart automatic power factor correction device

    The LHCb RICH PMTs Readout Electronics and the Monitoring of the HPDs Quantum Efficiency

    Get PDF
    LHCb is one of the four main experiments under construction on the Large Hadron Collider at CERN. Its purpose is to study CP violation in B mesons and to look for new physics effects in rare decays of b-hadrons. Particle identification will be essential to enhance the signal/background ratio in the selection of physics channels. For this reason, the Ring Imaging Cherenkov technique has been implemented: two RICH detectors (RICH1 and RICH2) have been designed to cover the wide momentum range 1-150 GeV/c. The produced Cherenkov photons will be focused on two planes of Hybrid PhotoDetectors (HPDs), which are sensitive to external magnetic fields and then need to be shielded. Despite the shielding, however, there will be some fringe field inside the HPDs volume and so it is necessary to experimentally check what is the behaviour of each photodetector when the LHCb dipole magnet is on and the HPDs are illuminated by test patterns. In RICH2, two LED projectors based on the Digital Light Processing technology are exploited to generate the test patterns, which have to be precisely aligned on the two HPD planes. The matching procedure is carried out using six PMTs permanently placed inside the HPD matrices. The work described in this thesis concerns the design, realization and test of the PMTs readout system, both on the HW and SW level. In the last chapter, I will also try to evaluate the possibility to periodically monitor the HPDs Q.E. using the same beamer selected for the magnetic distortion tests. Chapter 1 is an introduction to CERN and the LHCb experiment. Paragraph 1.2 focuses on the two RICH sub-systems, while in 1.3 the HPD working principle is described. In paragraph 2.1 I describe the PMTs installed in the RICH2, while the rest of the chapter is dedicated to the DLP projectors to be used during the magnetic distortion tests. In particular, 2.2 illustrates the DLP technology, while 2.4 and 2.5 are about the beamers tests. Chapter 3 is dedicated to the PMTs readout electronics design, realization and test. After a theoretical study carried out in paragraph 3.1, in 3.2 I describe the realized shaper amplifier prototype. In 3.3 the choice of the digitiser to be installed in cascade to the shaper is discussed and the DAQ software program is described, while 3.4 summarizes the results obtained testing the prototype with the real signals. In 3.5 the final six-channel shaper amplifier + ADC is presented and tested, while 3.6 describes the installation of this module in the pit environment. Finally, in chapter 4 I estimate the sensitivity of the HPD Q.E. monitoring based on the magnetic distortion test apparatus

    Large space structure experiments for AAP. Volume 5 - Parabolic antenna Final report, 15 Sep. 1966 - 15 Sep. 1967

    Get PDF
    Apollo Applications Program parabolic antenna experiment to evaluate large space structures and extravehicular activitie

    Bridges Structural Health Monitoring and Deterioration Detection Synthesis of Knowledge and Technology

    Get PDF
    INE/AUTC 10.0

    Development of a drone-based miniaturized Flexible Microwave Payload (FMPL) for GNSS-Reflectometry and L-band radiometry

    Get PDF
    This project has been developed in collaboration with the NanosatLab UPC, which develops CubeSats for educational and scientific purposes and in-orbit technology demonstration. More specifically, the laboratory is focused on remote sensing systems. In recent years, the NanosatLab UPC has been developing the Flexible Microwave PayLoad (FMPL), the integration of different microwave remote sensing equipment in a single system: reflectometry Global Navigation Satellite System (GNSS) signals (GNSS-R) and microwave radiometry (MWR) in L-band. In 2022, the second version of this system, FMPL-2, is in orbit on board the CubeSat 3Cat5, which has provided precious scientific data on the climate of the earth and the evolution of climate change. The first version, FMPL-1, will be launched in the coming months aboard CubeSat 3Cat4. The third version, FMPL-3, is now ready for launch on board the CubeSat GNSSaS. From space, FMPL has proven to be a very useful tool for studying climate change. This work aims to design, build and test the first FMPL for drones, the FMPL-D. This new platform will be used to evaluate new versions of FMPL. It will also be a valuable tool to study the characteristics of soil, water, ice and vegetation locally and with a spatial resolution much greater than that which can be obtained from a satellite. The results presented in this thesis put the complexity of these systems into perspective. Firstly, in the results of the radiometer, an effect of distortion and destruction of the data obtained due to the radio frequency interference received during the measurement campaigns has been observed, highlighting the need for detection and mitigation systems interference for ground observation missions. For the GNSS reflectometry instrument, multiple flights were conducted in which large amounts of data were collected, the processing of which is still in progress. Preliminary results indicate good characteristics of the radio frequency chain. This Final Degree Project (TFG) is the first version of the FMPL-D, culminating in the system's first version and many lessons learned.Objectius de Desenvolupament Sostenible::13 - Acció per al Clim

    PV inverters for module level applications

    Get PDF
    Dissertação para obtenção do Grau de Mestre em Energias Renováveis – Conversão Eléctrica e Utilização SustentáveisNowadays, the photovoltaic (PV) energy is presented as one of the most promising source of clean energy, and so a good way for greenhouse gas emissions mitigation and reduce the fossil fuel dependence. Within it, the photovoltaic energy has caused a huge interest in the electronic converters, and the need to improve their efficiency and reducing their cost. With this work I present a solution for a module scale grid-connected single-phase inverter. The solution consists in a two-stage inverter insolated with a grid line transformer. The two-stage inverter is composed by a DC-DC converter and a DC-AC converter connected through a DC-link capacitor. The DC-DC converter in case is a boost converter used to elevate the voltage from the PV module to a higher level. For the DC-AC converter it is used a full-bridge inverter, and both the DC-DC and the DC-AC converters use the IGBTs form an integrated module with its respective drivers. To the boost control it is implemented a Maximum Power Point Tracking algorithm that can optimize the power extraction from the PV source and for the inverter it is used a sliding mode hysteretic control. Once this inverter is conceived to work connected to the grid, a single-phase PLL system is used to synchronize the injected current to grid voltage. All the control part is made digitally using an Arduino Uno board, which uses an Atmel microcontroller

    Design of High Power Converter with SiC MOSFETs

    Get PDF
    Tato diplomová práce se zabývá návrhem výkonového měniče založeného na topologii typu synchronní buck. Měnič je zkonstruován s využitím MOSFET tranzistorů na bázi silikon karbidu. Tato práce se věnuje analýze měniče s cílem navrhnout a realizovat řídící jednotku umožňující jak zpětnovazební regulaci měniče, tak řízení v otevřené smyčce. Za tímto účelem je odvozen analytický model měniče coby dynamického systému, který je použit pro návrh a simulaci řízení. Kontrolní jednotka je implementována s využitím 32 bitového mikrořadiče založeného na architektuře ARM. V této práci je poskytnut popis a použití klíčových periférií mikrořadiče pro realizaci řízení. Na závěr jsou shrnuty výsledky měření dynamického chování výkonových tranzistorů při provozu měniče. Pozornost je především věnována měření proudu tekoucího jedním tranzistorem s využitím běžného rezistoru pro snímání proudu a kompenzaci frekvenční charakteristiky rezistoru.This master degree thesis is concerned with the design of high power converter. The converter is based on synchronous buck topology and is realized using silicon carbide MOSFET transistors. This work deals with an analysis of such type of converter to design and realize a control unit providing feedback control of the converter. Therefore, a dynamic model of the converter is derived using a conventional technique of averaged state space modeling. The derived model is used for controller design and closed-loop control simulation. The control unit is implemented using a 32-bit ARM-based microcontroller. Hence, an insight into the microcontroller key peripherals is provided as well as a brief overview of the firmware architecture. This work concludes by a brief investigation of switching waveforms of SiC MOSFETs acquired during the converter operation. Attention is called to a transistor current measurement with a low-cost current sensing resistor and its frequency characteristic compensation

    A Robotized Raspberry-Based System for Pothole 3D Reconstruction and Mapping

    Get PDF
    Repairing potholes is a task for municipalities to prevent serious road user injuries and vehicle damage. This study presents a low-cost, high-performance pothole monitoring system to maintain urban roads. The authors developed a methodology based on photogrammetry techniques to predict the pothole's shape and volume. A collection of overlapping 2D images shot by a Raspberry Pi Camera Module 3 connected to a Raspberry Pi 4 Model B has been used to create a pothole 3D model. The Raspberry-based configuration has been mounted on an autonomous and remote-controlled robot (developed in the InfraROB European project) to reduce workers' exposure to live traffic in survey activities and automate the process. The outputs of photogrammetry processing software have been validated through laboratory tests set as ground truth; the trial has been conducted on a tile made of asphalt mixture, reproducing a real pothole. Global Positioning System (GPS) and Geographical Information System (GIS) technologies allowed visualising potholes on a map with information about their centre, volume, backfill material, and an associated image. Ten on-site tests validated that the system works in an uncontrolled environment and not only in the laboratory. The results showed that the system is a valuable tool for monitoring road potholes taking into account construction workers' and road users' health and safety
    corecore