Sökning: "speed reduction"

Visar resultat 1 - 5 av 306 avhandlingar innehållade orden speed reduction.

1. 1. Loyal Speed Adaptation Speed limitation by means of an active accelerator and its possible impacts in built-up areas

   Författare :Sverker Almqvist; Trafik och väg; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; active accelerator; LSA; speed; speed reduction; driver behaviour; traffic safety; ISA; Teknik; Technological sciences; Road transport technology; Vägtransportteknik;

   Sammanfattning : Traditional measures for improved traffic safety need to be complemented by modern technologies in the struggle to reduce the consequences of traffic accidents all over the world. This thesis introduces the Loyal Speed Adaptation (LSA) function based on recent developments in the area of Intelligent Transport Sys-tems to support the vehicle drivers in not using inappropriate or excessive speeds, which have been found to be an important factor for causing serious and fatal accidents. LÄS MER

3. 2. In-vehicle speed adaptation - On the effectiveness of a voluntary system

   Författare :Magnus Hjälmdahl; Trafik och väg; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Road transport technology; Vägtransportteknik; Traffic safety; In-car observations; Long-term effects; Speed; Driver behaviour; ISA; Active Accelerator Pedal;

   Sammanfattning : The overarching aim of this thesis is to study the long term effects of a voluntary speed adaptation system, the Active Accelerator Pedal (AAP), and its effectiveness for different driver types. The papers making up this thesis are based on a study carried out on 284 vehicles and drivers in the Swedish city of Lund from 1999 until 2002. LÄS MER

4. 3. Study of Supersonic Jet Noise Reduction using LES

   Författare :Haukur Hafsteinsson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; G3D; Supersonic Jet; PIV; CD-nozzle; CFD; Compressible flow; CAA; Noise Reduction; LES; Flow Control;

   Sammanfattning : Increases in air traffic and denser population around airports have led to stricterregulations on aircraft noise. High noise levels from high-speed aircraft can causehearing damage in pilots and the airfield personnel. The engine is the main sourceof noise of all jet aircraft and is therefore a key component for improvement. LÄS MER

5. 4. Dynamic speed adaptation based on information technology - a theoretical background

   Författare :Andras Varhelyi; Trafik och väg; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknik; Technological sciences; driver acceptance; appropriate speeds; speed behaviour; critical conditions; Social sciences; Samhällsvetenskaper;

   Sammanfattning : Knowledge on the factors influencing driver speed-behaviour, the relationship between speed and traffic safety and means to influence speed behaviour is systematised. Expert judgements and the high proportion of injury accidents show that improved speed adaptation has the largest safety potential in the following situations: - Road surface-, visibility and weather affected situations (e. LÄS MER

7. 5. BlueBellMouse. A Tool for Kinetic Model Development

   Författare :Raffaella Bellanca; Förbränningsfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; combustion; HCCI; reduction; engine; kinetic; simulation; graphical user interface; GUI; optimization; chemical mechanism; Physics; Fysik; Fysicumarkivet A:2004:Bellanca;

   Sammanfattning : The simulation of physical phenomena occurring in chemical reactors requires the description of the kinetics involved in the underlying combustion process. Kinetic models are developed for this purpose. LÄS MER