Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

(Produktform)Paperback / softback --- (Produktform (spezifisch))Paperback (DE) --- Raspberry Pi --- Programming --- Projects --- PID Controller --- Arduino --- (VLB-WN)1684: Hardcover, Softcover / Technik/Elektronik, Elektrotechnik, Nachrichtentechnik

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

This thesis brings a complete redesign to the power supply of an X-Ray fluorescence (XRF) spectrometer. 

XRF is the phenomenon in which an atom absorbs an X-radiation with a certain energy level and release another X-radiation with another energy level. Indeed, if the excitation source has enough energy, ionization can occur in the material and the atoms become unstable. To restore equilibrium, electrons from higher orbitals can fall to fill the gap by releasing energy (in the form of a photon) equal to the difference between the 2 orbitals involved. In an energy-dispersive spectrometer (EDXRF), the number and the energy of the incoming X-rays are measured and then sorted. A complete spectrum of the target can be obtained, and the atomic composition of the target determined.

The ALEXIS instrument is basically composed of 6 excitation sources, 1 detector and signal processing electronics. The excitation sources are pyroelectric crystals which are thermally cycled in order to have a continuous flux of X-Rays. The detector is a Silicon Drift Detector (SDD) which the actual state of art in EDXRF analysis. This technology needs to be cooled down by a Peltier element and must be polarized by a high negative voltage to drift the electron-hole pairs produced by the X-Rays impact to the collection electrode.

The first part of the thesis is dedicated to the design of a controller for a current source driving the Peltier cooler. The goal is to obtain a stable cold temperature of the detector chip during the measurements. In space applications, due to radiations, analog electronics is preferred to digital. That is why an analog PID controller has been implemented based on the temperature feedback coming from the SDD. The finality of this part is a series of simulations to tune PID parameters.

The second part of the work is the implementation of the thermal cycle of the sources. Two temperature thresholds determine if the source must be powered up or not and the 6 sources must work independently. In order to achieve this, an analog Schmitt trigger was designed on each source with a digitally controlled gain attenuator to control the output voltage. Final simulations give results very close to the real lab tests.

The last part of the project described the method to design a DCM Flyback converter. The goal is to generate negative high voltage from the rover power supply (28V) in order to generate the drift electric field in the SDD. A spreadsheet was created. It automatically computes the circuit parameters according to the input/output requirements. The conclusion is open-loop simulations performed to show the influence of the parameters. Future closed-loop design is just discussed.

EDXRF --- ALEXIS project --- Power supply --- Peltier cooling --- Analog PID controller --- Schmitt trigger --- DCM Flyback converter --- Ingénierie, informatique & technologie > Ingénierie électrique & électronique

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

This book consists of nine papers covering a number of basic ideas, concepts, and methods of nonlinear analysis, as well as some current research problems. Thus, the reader is introduced to the fascinating theory around Brouwer's fixed point theorem, to Granas' theory of topological transversality, and to some advanced techniques of critical point theory and fixed point theory. Other topics include discontinuous differential equations, new results of metric fixed point theory, robust tracker design problems for various classes of nonlinear systems, and periodic solutions in computer virus propagation models.

Research & information: general --- Mathematics & science --- Krasnosel'skiĭ's fixed point theorem --- positive solutions --- discontinuous differential equations --- differential system --- p-Laplacian --- choquard equation --- nonhomogeneous --- nehari method --- minimax methods --- essential maps --- homotopy --- selections --- PID controller --- sliding mode control --- hybrid Taguchi real coded DNA algorithm --- perturbation estimator --- ℳ?-function --- ℳ?(λ)-function --- τ-function --- essential distance (e-distance) --- e0-metric --- Du-Hung's fixed point theorem --- Mizoguchi-Takahashi's fixed point theorem --- Nadler's fixed point theorem --- Banach contraction principle --- minimax --- multiplicity --- global minima --- Brouwer fixed point theorem --- Hamadard theorem --- Poincaré-miranda theorem --- nonlinear elliptic problem --- Robin boundary condition --- gradient dependence --- sub-supersolution --- positive solution --- periodic solutions --- SEIR-KS model --- computer virus model

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

This Special Issue summarizes, in a single reference, timely emerging topics related to power electronics for sustainable energy conversion. Furthermore, at the same time, it provides the reader with valuable information related to open research opportunity niches.

Technology: general issues --- History of engineering & technology --- Energy industries & utilities --- constant power load --- boost converter --- discontinuous conduction mode --- nonlinear control --- switched system --- fractional-order PID controller --- DC–DC converters --- Non-minimum phase systems --- experimental validation --- renewable energy sources --- dc-dc power electronic converters --- energy efficiency --- switching DC-DC converters --- quadratic converter --- PV systems --- fuel cell --- new equivalent electrical model of fuel cell --- PEMFC NEXA 1200 --- comparative study --- multilevel inverter --- power electronics --- staircase modulation --- vector modulation --- ultrawide bandgap --- semiconductors --- neutral point clamped --- inverter --- silicon --- gallium trioxide --- fabrication --- hybridization --- PV generation --- space vector modulation --- transformerless inverters --- grid connection --- leakage ground current --- wind turbine generator (WTG) --- permanent magnet synchronous generator (PMSG) --- low voltage ride-through (LVRT) --- silicon carbide (SiC)-based inverter --- core losses methods --- power losses --- ferromagnetic material --- inductors --- transformers --- n/a --- DC-DC converters

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

This book reprints articles from the Special Issue "Industrial Applications: New Solutions for the New Age" published online in the open-access journal Machines (ISSN 2075-1702). This book consists of twelve published articles. This special edition belongs to the "Mechatronic and Intelligent Machines" section.

Technology: general issues --- History of engineering & technology --- induction machines --- electrical machines --- vector control --- SVPWM modulation --- frequency inverter --- artificial intelligence --- photovoltaics --- fault detection --- machine learning --- operation and maintenance --- renewable energy --- water-in-crude oil emulsion --- water content --- ultrasound --- propagation velocity --- exoskeletons --- test bench --- industry --- benchmarking --- microgrid model-based systems engineering --- service systems --- goal-oriented requirements engineering --- safety instrumented system --- ventricular assist device Bayesian network --- Petri net --- control strategy --- UAV --- fuzzy --- PID controller --- ROS --- Industry 4.0 --- database --- data models --- big data and analytics --- asset administration shell --- MLOps --- digital twin --- IoT --- prediction --- coordinate metrology --- optical scanning --- noise reduction --- digital manufacturing --- integrated inspection system --- data analytics --- uncertainty --- convolutional neural networks --- warehouse management --- image classification --- ensemble learning --- synthetic data --- depth image --- electrical maintenance --- COVID-19 --- thermography --- fever --- computer vision --- intelligent systems