Sökning: "frequency modulation"

Visar resultat 11 - 15 av 147 uppsatser innehållade orden frequency modulation.

1. 11. RF Compressor (SLED) Phase-Modulation to Reduce Peak Fields in the MAX IV Linear Accelerator

   Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

   Författare :Joel Ekström; [2023]
   Nyckelord :Accelerator; MAX IV; LINAC; Phase-modulation; SLED; Pulse compression; Technology and Engineering;

   Sammanfattning : Modern particle accelerators need strong electric fields in order to produce high energy particles. Such high voltages are typically reached by injecting pulsed radio frequency power through several steps of amplification. At the end, pulse compression is used to further improve the energy gain at the cost of pulse-length. LÄS MER

3. 12. Coexistence of Dual Inductive Wireless Power Transfer Systems

   Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

   Författare :Eneas Hållsten; [2022]
   Nyckelord :Technology and Engineering;

   Sammanfattning : Wireless power transfer is emerging into everyday life. The idea is to create a more convenient way of charging, or at least powering, devices. LÄS MER

4. 13. Time-resolved x-ray diffraction study of longitudinal optical phonons in zincblende semiconductors

   Master-uppsats, Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

   Författare :Lassi Linnala; [2022]
   Nyckelord :femtosecond THz radiation; ultrafast x-ray diffraction; pump-probe; longitudinal optical phonons; zincblende semiconductors; anharmonic decay; density functional perturbation theory; Physics and Astronomy;

   Sammanfattning : Anharmonic decay of longitudinal optical (LO) phonons in zincblende semiconductors is not at present well characterized due to the polar and many-body nature of the problem. Femtosecond THz radiation offers a novel route to this study, as the interaction of this radiation is directly with the phonon lattice and these THz excited phonons do not have enough energy to excite electrons over the band gap. LÄS MER

5. 14. Validation of the attitude control of KNATTE with flexible appendages

   Master-uppsats, Luleå tekniska universitet/Institutionen för system- och rymdteknik

   Författare :Christoffer Johansson; [2022]
   Nyckelord :KNATTE; flexible appendages; control; SMC; LQG; PWM; PWPF;

   Sammanfattning : The effect of flexible panels on a spacecraft during attitude movement may induce problems if not correctly accounted for in the control system for the spacecraft. The aim of this thesis is to find and evaluate, control algorithms that could be suitable for the Kinesthetic Node and Autonomous Table-Top Emulator (KNATTE) with two flexible mock-up solar panels during an attitude movement of 20 degrees. LÄS MER

7. 15. Continuous Control SetModel Predictive Control of Permanent Magnet Synchronous Motor

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Prithivirajan Subramaniyane; [2022]
   Nyckelord :Interior permanent magnet synchronous motor; Continuous control set-Model predictive control; Linear quadratic regulator; Quadratic programming; Interior permanent magnet synchronous motor; Continuous control set-Model predictive control; Linear quadratic regulator; Quadratic programming;

   Sammanfattning : The thesis provides design methods for developing Continuous Control SetModel Predictive Control and Linear Quadratic Regulator for Interior mounted Permanent Magnet Synchronous Motor drive. The software for these controllers are implemented in the prototype motor at China Euro Vehicle Technology (CEVT) to estimate the computation time. LÄS MER