Sökning: "wall vibrations"

Visar resultat 11 - 15 av 18 avhandlingar innehållade orden wall vibrations.

  1. 11. Energy Harvesting and Energy Storage for Wireless and Less-Wired Sensors in Harsh Environments

    Författare :Elof Köhler; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Piezoelectric; coupled harvester; Thermoelectric; harsh environment; piezoelectric harvester; Energy harvester; supercapacitor; Thermoelectric harvester;

    Sammanfattning : Engineering requires sensors to control and understand the environment. This is particularly important in harsh environments. The drawbacks, especially in gas turbines is the complexity of installing a wired sensor and the weight of the wires. This makes wireless sensors attractive. LÄS MER

  3. 12. Breathing and phonation : effects of lung volume and breathing behaviour on voice function

    Författare :Jenny Iwarsson; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Abduction; Adduction; Breathing; Flow glottogram; Inhalation; Lung volume; Perceptual analysis; Phonation; Posture; Speech lung volume; Speech task; Subglottal pressure; Tracheal pull; Vertical laryngeal position; Vocal fold nodules; Voice source;

    Sammanfattning : Respiration is believed to play a central role in voice function and is thus of relevance to the clinical care of the disordered voice. The overall aim of the present study was to experimentally investigate relationships between the respiratory and phonatory systems. LÄS MER

  4. 13. Air-pocket transport in conjunction with bottom-outlet conduits for dams

    Författare :Ting Liu; Anders Wörman; James Yang; Staffan Lundström; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Air-water two-phase flow; critical velocity; diameter effect; roughness; VOF model; bottom outlet; experiment;

    Sammanfattning : Undesired air entrainment in bottom outlet conduits of dams may cause pressure transients, leading to conduit vibrations, blowback, discharge pulsation and even cavitation, and jeopardize the operational safety. Due to design limitations or construction costs, it is impossible to create an air free environment in a pressurized pipe. LÄS MER

  5. 14. Cavitation Erosion Mechanisms in Cast Irons

    Författare :Marcio Freitas de Abreu; Stefan Jonsson; Jessica Elfsberg; Matevz Dular; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknisk materialvetenskap; Materials Science and Engineering;

    Sammanfattning : The research presented in this thesis investigated the mechanisms by which cavitation erosion damage develops in lamellar graphite iron (LGI) and austempered ductile irons (ADIs). This has been achieved by image sequences of surface erosion on test samples in tandem with weight change measurements. LÄS MER

  7. 15. Voice function and quality of life in laryngectomees

    Författare :Elisabet Lundström; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Individuals who undergo laryngectomy, surgical removal of the larynx, loose their normal voice. The breathing pattern is altered to permanent tracheostomal breathing. A new voice can be established by use of a segment in the lower part of the pharynx and the most upper part of the esophagus, the pharyngo-esophageal (PE) segment. LÄS MER