Sökning: "assumed modes"

Visar resultat 1 - 5 av 42 avhandlingar innehållade orden assumed modes.

  1. 1. Prediction of engine component loads using previous measurements

    Författare :Pär Mikaelsson Elmén; Mårten Olsson; Jan-Olov Aidanpää; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; engine; engine block vibration; engine block twist; engine block bending; vibration measurement; vibration estimation; rigid body vibrations; assumed modes; bending modes; torsion modes; system modification; Hållfasthetslära; Solid Mechanics;

    Sammanfattning : Internal combustion engines are used in many applications. The same engine type may have different components mounted to it depending upon its use. These engine mounted components need to be designed against fatigue in order to withstand the engine vibrations. Measured engine vibrations are commonly used as input data for fatigue estimation. LÄS MER

  3. 2. Airborne cognitive systems in search of an appropriate context: Studies of the introduction of new technology in aviation using a cognitive systems engineering approach

    Författare :Örjan Goteman; Ergonomi och aerosolteknologi; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Lufttransportteknik; Air transport technology; Safety; RNAV; Pilot; Automation Modes; HUD; Datalink; Cognition; Automation; Aviation;

    Sammanfattning : Abstract Technology is always designed for an assumed user in an assumed context. In commercial aviation, these design assumptions are clearly spelt out in that both crew and equipment are certificated for a specific operation as stated in the aircraft flight manual. LÄS MER

  4. 3. Underlying psychological mechanisms of helping effects : Examining the when × why of charitable giving

    Författare :Arvid Erlandsson; Institutionen för psykologi; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; charitable giving; helping; prosocial behavior; helping effects; identified victim effect; proportion dominance effect; in-group effect; emotions; sympathy; perceived utility; perceived responsibility; decision modes; mediation; moral decision making; dual-process theories.;

    Sammanfattning : The overarching purpose of this thesis was to investigate if different helping effects can be specifically linked to different psychological mechanisms. Helping effects (i.e. the when of helping) refer to situational differences that can increase or decrease the probability of helping. LÄS MER

  5. 4. Flow Pulsations in Fluid Power Machines - a Measurement and Simulation Study

    Författare :Liselott Ericson; Linköpings universitet; []
    Nyckelord :noise; pump; motor; measurement; optimisation; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : Stricter requirements for better working environment involve noise and vibration control of hydraulic machines. The operational conditions for hydraulic machines, such as pressure and rotational speed, are also increasing and this makes it even more difficult to develop a quiet, vibration-free machine due to the interdependence between noise and escalating operational conditions. LÄS MER

  7. 5. Global stability and feedback control of boundary layer flows

    Författare :Espen Åkervik; Dan S. Henningson; Luca Brandt; Dwight Barkley; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Stability; Global Stability; Feedback Control; Control; Estimation; Absolute Convective Instabilities; Model Reduction; Fluid mechanics; Strömningsmekanik;

    Sammanfattning : In this thesis the stability of generic boundary layer flows is studied from a global viewpoint using optimization methods. Global eigenmodes of the incompressible linearized Navier-Stokes equations are computed using the Krylov subspace Arnoldi method. LÄS MER