Sökning: "Trucks"

Visar resultat 6 - 10 av 186 avhandlingar innehållade ordet Trucks.

  1. 6. Active Flow Control for Drag Reduction of Heavy Vehicles

    Författare :Mohammad El-Alti; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Active and Passive Flow Control; Tilt-rotor wing; Large-eddySimulation; Heavy vehicles; optimization; Full-scale road test; Trucks; Bluff-body; Wake; Drag reduction; Aircrafts; Response surface methodology; Synthetic-jet Actuator;

    Sammanfattning : This thesis considers the aerodynamics of trucks. The work focuses on the aerodynamic drag caused by the wake. Bluff-body flows are dominated by large dissipative vortex-shedding wakes with a low mean pressure compared to the high pressure on their frontal area. LÄS MER

  3. 7. Heavy Vehicle Maintenance in an Industrial Network Perspective: Implications of Embeddedness and Interdependencies

    Författare :Klas Hedvall; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Business Networks; Transport Solutions; Trucks; Activities; Transport Service Triad; Road Transports; ARA Model; Vehicle Maintenance; Interdependencies; Maintenance; Embeddedness;

    Sammanfattning : Road transport solutions are often complex and involve numerous stakeholders. To secure that goods arrive in a timely and efficient manner, companies must cooperate and interact to define, implement and operate the transport solutions required. LÄS MER

  4. 8. The application of environmental requirements in procurement of road maintenance in Sweden

    Författare :Charlotta Faith-Ell; Lennart Folkeson; Brian Atkin; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Environmental technology; green procurement; road maintenance; environmental management; environmental requirement; trucks; vehicles; Miljöteknik; Environmental engineering; Miljöteknik;

    Sammanfattning : The Swedish Road Administration (SRA) is responsible for maintenance of the state-run roads in Sweden. The SRA also has an overarching responsibility for the state of the environment in the road transport sector. LÄS MER

  5. 9. Active Flow Control for Aircrafts and Heavy Vehicles

    Författare :Mohammad El-Alti; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Trucks; Drag reduction; Bluff-body; Large-eddy Simulation; Wake; Tilt-rotor wing; optimization; Aircrafts; Heavy vehicles; Active and Passive Flow Control; Response surface methodology; Synthetic-jet Actuator;

    Sammanfattning : Bluff-body flows are dominated by large dissipative vortex-shedding wakes with low mean pressure compared to the high pressure on their frontal area. This induced pressure difference is the major contribution to the total aerodynamic drag. LÄS MER

  7. 10. Optimal Speed and Powertrain Control of a Heavy-Duty Vehicle in Urban Driving

    Författare :Manne Held; Jonas Mårtensson; Jonas Fredriksson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Autonomous vehicles; model predictive control; optimal control; heavy-duty vehicles; trucks; powertrain control; fuel; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : A major challenge in the transportation industry is how to reduce the emissions of greenhouse gases. One way of achieving this in vehicles is to drive more fuel-efficiently. LÄS MER