Sökning: "ground vehicle"

Visar resultat 1 - 5 av 75 avhandlingar innehållade orden ground vehicle.

  1. 1. Sound propagation from sustainable ground vehicles from aeroacoustic sources to urban noise

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Nicolas Pignier; Ciarán O'Reilly; Susann Boij; Gwenael Gabard; [2015]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; sound propagation; sound generation; ground vehicle; aeroacoustics; aerodynamics; Kirchhoff approximation; detached eddy simulation; Ffowcs Williams and Hawkings; ljudutberdning; ljudalstring; markfordon; aeroakustik; aerodynamik; Kirchhoff approximation; detached eddy simulation; Ffowcs Williams and Hawkings; Farkostteknik; Vehicle and Maritime Engineering; Teknisk mekanik; Engineering Mechanics;

    Sammanfattning : Transportation is the main source of environmental noise in Europe, with an estimated 125 million people affected by excessive noise levels from road traffic, causing a burden of noise related diseases and having a substantial economic impact on society. In order to reduce exposure to high levels of traffic noise, two approaches are the topic of extensive research: preventing sound from propagating from roads and railways using for example noise barriers, and reducing the sources of noise themselves. LÄS MER

  2. 2. Numerical Investigation of Unsteady Crosswind Aerodynamics for Ground Vehicles

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Tristan Favre; Gunilla Efraimsson; Mattias Chevalier; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Aerodynamics; Vehicle Aerodynamics; Unsteady Aerodynamics; Crosswind; Unsteady Crosswind Aerodynamics; Detached-Eddy Simulations; DES; TECHNOLOGY Engineering mechanics Vehicle engineering; TEKNIKVETENSKAP Teknisk mekanik Farkostteknik; TECHNOLOGY Engineering mechanics Fluid mechanics; TEKNIKVETENSKAP Teknisk mekanik Strömningsmekanik;

    Sammanfattning : Ground vehicles are subjected to crosswind from various origins such as weather, topography of the ambient environment (land, forest, tunnels, high bushes...) or surrounding traffic. LÄS MER

  3. 3. Reconfigurable Motion Control Systems for Over-Actuated Road Vehicles

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Leo Laine; [2007]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hybrid electric vehicle; control allocation; over-actuated; road vehicle; motion control system; reconfigurable;

    Sammanfattning : Over-actuated systems, such as today's road vehicle configurations, have more motion actuators than controlled motions. For example, a passenger car has a combustion engine and four mechanical brakes, all of which can be used individually to correct any error in yaw rate when the vehicle becomes under- or oversteered. LÄS MER

  4. 4. Transient steering of tracked vehicles on hard ground

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Dag Thuvesen; [1997]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; DADS; steering; ADAMS; MBS; hard ground; tracked vehicle; MECHANICA MOTION; multi body system; solid ground; simulation;

    Sammanfattning : .... LÄS MER

  5. 5. Predicting the sound field from aeroacoustic sources on moving vehicles Towards an improved urban environment

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Nicolas Pignier; Ciarán O'Reilly; Susann Boij; Michael Carley; [2017]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; pass-by simulations; aeroacoustic sources; urban sound propagation; direct numerical beamforming; linear programming deconvolution; Kirchhoff approximation; moving sources; detached-eddy simulation; Ffowcs Williams-Hawkings; vehicle design; förbifartssimuleringar; aeroakustiska källor; urban ljudutbredning; direkt numerisk lobformning; avfaltning med hjälp av linjärprogrammering; Kirchhoffs approximation; rörliga källor; detached-eddy simulation; Ffowcs Williams-Hawkings; fordonsdesign; Farkostteknik; Vehicle and Maritime Engineering;

    Sammanfattning : In a society where environmental noise is becoming a major health and economical concern, sound emissions are an increasingly critical design factor for vehicle manufacturers. With about a quarter of the European population living close to roads with heavy traffic, traffic noise in urban landscapes has to be addressed first. LÄS MER