Sökning: "multistage"

Visar resultat 1 - 5 av 69 avhandlingar innehållade ordet multistage.

  1. 1. Multistage gearboxes : vibration based quality control

    Författare :Johan Wändell; Hans Bodén; Ulf Carlsson; Kjell Ahlin; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Acoustics; Akustik;

    Sammanfattning : In this thesis, vibration based techniques for detection of localised surface damages in multistage gearboxes are presented and evaluated. A modern vehicle gearbox is a complex system and the number of potential errors is large. For instance, surface damages can be caused by rough handling during assembly. LÄS MER

  3. 2. On Multistage Analysis of Transonic Compressors: From Axisymmetric Throughflow Time-Marching to Unsteady Three-Dimensional Methods

    Författare :Stephane Baralon; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; shock; time-marching; deterministic; average-passage; multistage; fan; axisymmetric; 3D; unsteady; transonic; viscous; body force; stress; singularity; perturbation; throughflow; mixing-plane; modelling; finite-volume;

    Sammanfattning : A throughflow time-marching finite-volume solver, capable of computing viscous transonic multistage compressor flows with embedded shocks, is presented. The behavior of the blade model, based on the blade mean surface flow tangency condition, was investigated for transonic flows. LÄS MER

  4. 3. Characterising the Deformation Behaviour of Unbound Granular Materials in Pavement Structures

    Författare :Mohammad Shafiqur Rahman; Sigurdur Erlingsson; Charles Schwartz; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; unbound granular materials; resilient modulus; permanent deformation; moisture; model; multistage; repeated-load triaxial test; Transportvetenskap; Transport Science; Civil and Architectural Engineering; Byggvetenskap;

    Sammanfattning : Unbound granular materials (UGMs) used in the base and sub-base layers of flexible pavements play a significant role in the overall performance of the structure. Proper understanding and characterization of the deformation behaviour of UGMs in pavement structures are, therefore, vital for the design and maintenance of flexible pavements. LÄS MER

  5. 4. Efficient Trading in the Short-term Electricity Markets for Integration of Renewable Energy Sources : Multistage Stochastic and Agent-based Modeling Approaches for Continuous Intraday Electricity Market

    Författare :Priyanka Shinde; Mikael Amelin; Lennart Söder; Nikolaos Paterakis; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Continuous intraday electricity market; Virtual power plant; Trading strategy; Stochastic dual dynamic program; Agent-based modeling; Adaptive learning; Renewable energy sources; Cross-border intraday trading; Flow-based market coupling; Balancing market; Imbalance settlement cost; Randomized progressive hedging; Multistage stochastic programming; Energy storage; Intraday prices; Intraday price analysis; Time series analysis; Kontinuerliga intradagmarknaden; Virtuellt kraftverk; Handelsstrategi; Stokastisk dual dynamisk programmering; Agentbaserad modellering; Adaptivt l¨arande; F¨ornybara energik¨allor; Gr¨ans¨overskridande intradaghandel; Fl¨odesbaserad marknadskoppling; Balansmarknaden; Balansavr¨akningskostnader; Randomiserad progressive hedging; Stokastisk multiskedesprogrammering; Energilagring; Intradagpriser; Intradagprisanalys; Tidsserieanalys; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : This thesis investigates the role of different short-term electricity market design aspects that can facilitate better coordination of resources within the power system. The work also emphasizes on better cross-border integration of the short-term markets to improve the market liquidity, competition, social welfare, and flexibility in the system, which is essential for facilitating the integration of renewable sources. LÄS MER

  7. 5. Towards flexible audio coding

    Författare :Renat Vafin; Bastiaan Kleijn; Juergen Herre; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electronics; Audio coding; multistage coding; waveform coding; parametric coding; sinusoidal coding; Elektronik; Electronics; Elektronik;

    Sammanfattning : thesis is about audio coding and improving flexibility thereof. Audio coding is used to reduce the bit rate needed to represent audio signals in digital format. When the available bit rate is low, parametric coding methods that use models to describe perceptually-important features of audio signals have shown their efficiency. LÄS MER