Essays about: "variable wave speed"

Found 5 essays containing the words variable wave speed.

1. 1. Sensorless Control of Synchronous Machines in Python Using Signal Injection : An implementation of a High-Frequency Square-Wave Injection Algorithm on a Linear and Non-Linear Synchronous Machine Model in open-source Software Motulator

   University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Author : Simon Lundberg; [2022]
   Keywords : High-frequency signal injection; Permanent Magnet Synchronous Motor; sensorless speed control; Synchronous Reluctance Machine; square-Wave injection; Fyrkantsvågsinjektering; högfrekvent signalinjektering; Permanentmagnetsmotor; sensorlös hastighetskontroll; synkron reluktansmotor;

   Abstract : The importance of accurately controlling the speed and torque of Synchronous Machines (SMs) in industry, transportation, aerospace, to name a few, can not be overstated. The driving unit to control the machines are called Variable Speed Drives (VSDs) and they can be designed in many different ways. READ MORE

3. 2. Shallow near-surface lapse rates and their connection to glacier meteorology on Storglaciären and Rabots glaciär, Northern Sweden

   University essay from Stockholms universitet/Institutionen för naturgeografi

   Author : Moon Taveirne; [2022]
   Keywords : Temperature lapse rate; glacier meteorology; near-­surface lapse rate; ablation gradient;

   Abstract : Glacier melt is strongly impacted by climate and meteorology. Temperature lapse rates are used to model glacier melt, and the accuracy of the spatial distribution of modelled melt can be impacted by the lapse rate used in modelling. Additionally, the observed spatial distribution of melt is highly temporally variable. READ MORE

4. 3. Numerical Analysis of the Two Dimensional Wave Equation : Using Weighted Finite Differences for Homogeneous and Hetrogeneous Media

   University essay from Uppsala universitet/Avdelningen för beräkningsvetenskap

   Author : Christian Böhme; Anton Holmberg; Martin Nilsson Lind; [2020]
   Keywords : hetrogeneous media; variable wave speed; wave equation; finite differences; gamma method; multigrid; weighted central difference; numerical analysis; agmg; gamma discretisation; two dimensional wave equation;

   Abstract : This thesis discusses properties arising when finite differences are implemented forsolving the two dimensional wave equation on media with various properties. Both homogeneous and heterogeneous surfaces are considered. READ MORE

5. 4. Signal Processing for mmWave MIMO Radar

   University essay from Högskolan i Gävle/Avdelningen för elektronik, matematik och naturvetenskap

   Author : Óscar Faus García; [2015]
   Keywords : radar; automotive; MIMO; CW; 79 GHz; short-range radars SRR ; millimeter wave; CFAR; simulations; phase modulation; algorithms; system gain;

   Abstract : This thesis addresses the design study, implementation and analysis of signal processing algorithms for a 79 GHz millimeter-wave Phase Modulated Continuous Wave (PMCW) Multi Input Multi Output (MIMO) short range radar; performed in IMEC research institute (Leuven, Belgium). The radar system targets high resolution performance with low power consumption in order to integrate a full MIMO radar transceiver with digital processor and antennas in a compact package featuring a size of 1 cm2. READ MORE

6. 5. Ultrasound sensor for gas concentration measurement

   University essay from KTH/Mikrosystemteknik

   Author : Sheng Pang; [2011]
   Keywords : ;

   Abstract : In an anesthesia machine, there is a need to monitor the anesthesia concentration that is being delivered to the patient, mainly to stop and flush the system in case of fault but also to control the dosage of anesthesia. The infrared sensor with absorption spectrometry technology that Maquet use today is expensive and the desire for a cheaper solution leads to this master thesis. READ MORE