Search for dissertations about: "power supply unit thesis"

Showing result 1 - 5 of 41 swedish dissertations containing the words power supply unit thesis.

2. 1. Optimal Railroad Power Supply System Operation and Design : Detailed system studies, and aggregated investment models

   Author : Lars Abrahamsson; Lennart Söder; Arnd Stephan; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Abstract : Railway power supply systems (RPSSs) differ mainly from public power systems from that the loads are moving. These moving loads are motoring trains. Trains can also be regenerating when braking and are then power sources. These loads consume comparatively much power, causing substantial voltage drops, not rarely so big that the loads are reduced. READ MORE

4. 2. On Electrified Fluid Power Systems in Mobile Machinery

   Author : Samuel Kärnell; Liselott Ericson; Petter Krus; Rudolf Scheidl; Linköpings universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fluid power; Electrification; Variable displacement; Pump-controlled systems;

   Abstract : High power density in combination with flexible power distribution possibilities and extreme robustness are reasons why fluid power has been the preferred technology in mobile machinery, such as excavators and cranes, since the mid-20th century. In principle, the machines have been powered by a combustion engine which powers a pump, with the output from the pump being distributed to different functions via valves. READ MORE

5. 3. Towards an on-chip power supply: Integration of micro energy harvesting and storage techniques for wireless sensor networks

   Author : Agin Vyas; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Microsuperca- pacitor; On-chip power supply.; Piezoelectric energy harvester; CMOS compatible; MEMS;

   Abstract : The lifetime of a power supply in a sensor node of a wireless sensor network is the decisive factor in the longevity of the system. Traditional Li-ion batteries cannot fulfill the demands of sensor networks that require a long operational duration. READ MORE

6. 4. On magnetic amplifiers in aircraft applications

   Author : Lars Austrin; Göran Engdahl; Lars Liljestrand; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; magnetic amplifier magamp ; amorphous; power losses; control winding; self-saturating; hysteresis; converter; more electric aircraft MEA ; inverter; power-by-wire; dymola; permanent magnet generator; PM-generator transformer rectifier unit TRU ; constant speed drive CSD ; excess losses or anomalous losses; modeling; simulation; unmanned aerial vehicle UAV ; Electrical engineering; Elektroteknik;

   Abstract : In the process of designing an electric power supply system for an aircraft, parameters like low weight and low losses are important. Reliability, robustness and low cost are other important factors. READ MORE

7. 5. Improving physical flows in biomass-to-energy supply chains by means of pre-treatment technology and coordination

   Author : Martin Svanberg; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; pre-treatment technology; torrefaction and coordination; supply chain; biomass-to-energy; physical flow; logistics;

   Abstract : AbstractThe transition from fossil fuel to renewable energy sources such as biomass-to-energy (B2E) is an environmentally sustainable pathway. However, increased use of biomass is hampered by the high costs of logistics activities within the physical flow. READ MORE