Sökning: "piezoelectric transducer"

Visar resultat 1 - 5 av 12 avhandlingar innehållade orden piezoelectric transducer.

  1. 1. Active Health Monitoring of Aerospace Composite Structures by Embedded Piezoceramic Transducers

    Författare :Christophe Paget; KTH; []
    Nyckelord :embedded; piezoceramic; piezoelectric; transducer; composite; structural; integrity; health monitoring; damage detection; Lamb waves; wavelets; normal-mode expansion; FE-method; SLMT;

    Sammanfattning : The objectives of the thesis work were to study theinteraction between embedded piezoceramic transducers andcomposite structures as well as determine techniques tosimplify the Lamb waves analysis. Firstly, this studyconsidered the design of the embedded piezoceramic transducers. LÄS MER

  3. 2. Borrowing the Bat's Ear for Automation - Ultrasonic Measurements in an Industrial Environment

    Författare :Gunnar Lindstedt; Industriell elektroteknik och automation; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Automatiska system; control engineering; robotics; Automation; electrostatic transducer; piezoelectric transducer; echolocation; bat; automation; localization; recognition; geometry; distance; measurement; ultrasound; robotteknik; reglerteknik;

    Sammanfattning : This work focuses on measurement principles based on ultrasound for applications in industrial automation. The measurements made are of geometric nature. The methods used are when possible based on experience and/or inspiration from the study of bats. LÄS MER

  4. 3. Gap Discharge Transducers in a Transit Time Flow Measurement System Designed for Harsh Environments

    Författare :Kristoffer Karlsson; Per Lunde; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Industriell elektronik; Industrial Electronics;

    Sammanfattning : In this thesis, the potential of the gap discharge transducer is investigated as transducers in a time-of-flight gas flow measurement setup designed for harsh environments.In this thesis the gap discharge transducer is operated in two different modes, named spark discharge transducer and glow discharge transducer. LÄS MER

  5. 4. Gap discharge transducers applied to ultrasonic flow measurement

    Författare :Kristoffer Karlsson; Per Lunde; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Industriell elektronik; Industrial Electronics;

    Sammanfattning : In this thesis, the potential of the gap discharge transducer is investigated as both a sound pulse emitter and a sound pulse receiver in a gas flow measurement setup. The main objective is to use the gap discharge transducer as an integral part in a gas flow measurement system developed for harsh environments. LÄS MER

  7. 5. Energy Harvesting for Smart-Internet-Connected Bearings

    Författare :Fredrik Häggström; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Industrial Electronics; Industriell elektronik;

    Sammanfattning : With the number of interconnected devices, many of which being wireless, exceeding the human population, there is a need to power resource-constrained devices through means other than disposable batteries. Harvesting ambient energy from the vicinity of the device is one solution. LÄS MER