Search for dissertations about: "Forced Response"

Showing result 1 - 5 of 72 swedish dissertations containing the words Forced Response.

  1. 1. Numerical investigation of the sensitivity of forced response characteristics of bladed disks to mistuning

    University dissertation from Stockholm : Energiteknik

    Author : Mikkel Myhre; KTH.; [2003]
    Keywords : aircraft engines; gas turbines; bladed disk assemblies; vibrations; high cycle fatigue; forced response; mistuning;

    Abstract : Two state of the art finite element reduction techniquespreviously validated against the direct finite element method,one based on classical modal analysis and another based oncomponent mode synthesis, are applied for efficient mistunedfree vibration and forced response analysis of several bladeddisk geometries. The methods are first applied to two testcases in order to demonstrate the differences in computationalefficiency as well as to validate the methods againstexperimental data. READ MORE

  2. 2. Distributed thermal response tests New insights on U-pipe and Coaxial heat exchangers in groundwater-filled boreholes

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : José Acuña; KTH.; [2013]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Borehole heat exchangers; Distributed Thermal Response Test; Ground Source Heat Pumps; Coaxial; U-pipe; Multi-pipe; Pipe-in-pipe; Multi-chamber; Groundwater; Thermosyphon; SRA - Energy; SRA - Energi;

    Abstract : U-pipe Borehole Heat Exchangers (BHE) are widely used today in ground source heating and cooling systems in spite of their less than optimal performance. This thesis provides a better understanding on the function of U-pipe BHEs and Investigates alternative methods to reduce the temperature difference between the circulating fluid and the borehole wall, including one thermosyphon and three different types of coaxial BHEs. READ MORE

  3. 3. Forced use on arm function after stroke clinically rated and self-reported outcome and measurement during the sub-acute phase

    University dissertation from Örebro : Örebro universitet

    Author : Ann M. Hammer; Örebro universitet.; [2010]
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; stroke; upper limb; reliability; validity; ICF; forced use; motor function; effectiveness; rehabilitation; physiotherapy; grip force; MEDICINE; MEDICIN; Medicin; Medicine;

    Abstract : The overall aim was to evaluate the effectiveness of forced use on arm and hand recovery after stroke by applying a restraining sling on the non-affected arm and to investigate psychometric properties of selected upper limb measures.Papers I and II reported a randomised trial with 1- and 3-month follow-ups. READ MORE

  4. 4. Controlling Forced Response of a High Pressure Turbine Blade

    University dissertation from Stockholm : KTH

    Author : Jeff Green; KTH.; [2006]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TECHNOLOGY Engineering mechanics; TEKNIKVETENSKAP Teknisk mekanik;

    Abstract : Vibration induced High Cycle Fatigue (HCF) is a major consideration in designing gas turbines. Indeed, the Gas Turbine manufacturer must demonstrate that the vibration level of the turbomachinery blading is acceptably low, usually by using an engine strain gauge test. READ MORE

  5. 5. Experimental Investigation of Performance, Flow Interactions and Rotor Forcing in Axial Partial Admission Turbines

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Jens Fridh; KTH.; [2012]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; axial turbine; partial admission; part loads; experimental investigation; turbine performance; losses; dynamic rotor forces; forced response; unsteady flow; axialturbin; partialpådrag; dellaster; reglersteg; experimentell undersökning; turbinprestanda; förluster; dynamiska krafter; rotorvibration; instationär strömning;

    Abstract : The thesis comprises a collection of four papers with preceding summary and supplementary appendices. The core investigation solely is of experimental nature although reference and comparisons with numerical models will be addressed. READ MORE