Sökning: "damping"

Visar resultat 1 - 5 av 334 avhandlingar innehållade ordet damping.

  1. 1. On modally distributed damping in heavy vehicles

    Författare :Peter Holen; Annika Stensson Trigell; Zbigniew Lozia; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; damping; modal damping; chassis suspension; heavy vehicle; attachment compliance; Physics; Fysik;

    Sammanfattning : This thesis investigates passive damping system performance in heavy vehicles through analytical expressions, simulations with different vehicle models as well as through experimental evaluation in a tractor semi trailer combination. The objective is to study what levels of chassis suspension damping that are desirable for different vehicle modes and how this may be achieved with passive damping systems. LÄS MER

  2. 2. Piezoelectric Generation and Damping of Extensional Waves in Bars

    Författare :Anders Jansson; Bengt Lundberg; Urmas Valdek; Peter Olsson; Uppsala universitet; []
    Nyckelord :Technology; Piezoelectric; wave; generation; damping; bar; TEKNIKVETENSKAP;

    Sammanfattning : This thesis focuses on the electromechanical processes of generation and damping of transient waves in bars with attached piezoelectric members. In particular, the influence of amplifier and electrical circuitry on the mechanical waves is of interest. LÄS MER

  3. 3. Improving Machining System Performance through designed-in Damping : Modelling, Analysis and Design Solutions

    Författare :Lorenzo Daghini; Cornel Mihai Nicolescu; Miroslav Píška; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Machining performance; Cutting stability; Passive damping; High Damping Interface; Boring bar; Turret; SRA - Production; SRA - Produktion;

    Sammanfattning : With advances in material technology, allowing, for instance, engines to withstand higher combustion pressure and consequently improving performance, comes challenges to productivity. These materials are, in fact, more difficult to machine with regards to tool wear and especially machine tool stability. LÄS MER

  4. 4. The effects of damping treatment on the sound transmission loss of honeycomb panels

    Författare :Sathish Kumar Ramanathan; Leping Feng; Alexander Peiffer; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Sandwich Structures; Honeycomb Panels; Sound Transmission; Loss Factor; Damping; Sound Radiation; Acoustics; Akustik;

    Sammanfattning : In the industry, all passenger vehicles are treated with damping materials to reduce structure-borne sound. Though these damping materials are effective to attenuate structure-borne sound, they have little or no effect on the air-borne sound transmission. LÄS MER

  5. 5. Modelling Stiffness and Damping by Use of Fractional Calculus with Application to Railpads

    Författare :Åsa Fenander; Chalmers University of Technology; []
    Nyckelord :stiffness; initial conditions; modal synthesis; time integration; measurements; fractional calculus; railway tracks; fractional integrals; damping; railpads; structural dynamics; fractional derivatives; mathematical models;

    Sammanfattning : When studying the dynamic behaviour of a structure, e g a railway track, it is important for the analyst to model both stiffness and damping accurately. Mathematical models including fractional derivatives have been found to work well for many materials. Such models are linear and causal. LÄS MER