Sökning: "viscoelastic measurements"

Visar resultat 21 - 25 av 58 avhandlingar innehållade orden viscoelastic measurements.

  1. 21. On dynamic properties of rubber isolators

    Författare :Mattias Sjöberg; KTH; []
    Nyckelord :Rubber isolator; Dynamic stiffness; Nonlinear; Payne effect; Audible frequency; Fractional derivative; Mittag-Leffler function; Thermo-rheologically simple; Neo-Hooke;

    Sammanfattning : This work aims at enhancing the understanding and to provideimproved models of the dynamic behavior of rubber vibrationisolators which are widely used in mechanical systems.Initially, a time domainmodel relating compressions tocomponent forces accounting for preload effects, frequency anddynamic amplitude dependence is presented. LÄS MER

  3. 22. SPICE modeling of ultrasound systems : improvements and verifications

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

    Sammanfattning : The success of modern electronics is built on the possibility to accurately predict system behavior by the use of simulation tools. This paradigm can be extended to components such as sensors attached to the electronics. LÄS MER

  4. 23. Effective vibro-acoustical modelling of rubber isolators

    Författare :Michael Coja; Leif Kari; Wolfgang Kropp; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Applied mechanics; Rubber isolator; Bush mounting; Dynamic stiffness; Waveguide; Fractional derivatives; Mode-matching; Pre-compressed; Prestrain; Preload; Predeformation; Viscoelasticity; Dispersion; Teknisk mekanik; Engineering mechanics; Teknisk mekanik;

    Sammanfattning : This thesis, gathering four papers, concerns the enhancement in understanding and modelling of the audible dynamic stiffness of vibration rubber isolators including experimental measurements. Paper A studies the performances of three different types of vibration isolator using an indirect measurement technique to estimate the blocked dynamic transfer stiffness of each specimen. LÄS MER

  5. 24. Real-time analysis of blood coagulation and fibrinolysis : new rheological and optical sensing techniques for diagnosis of haemostatic disorders

    Författare :Kenny Hansson; Frank Brosstad; Linköpings universitet; []
    Nyckelord :MEDICINE; MEDICIN;

    Sammanfattning : The haemostatic system has a dual paradoxical function in the body. It should arrest bleeding whenever needed, but also keep the blood flowing in the circulatory system without any obstructing blood clots. The system is complex with maoy intertwined processes that interact to produce a fine-tuned regulation of the performance. LÄS MER

  7. 25. Electrodynamic and Mechanical Spectroscopy Method Development and Analysis Relating to Materials with Biotechnological Applications

    Författare :Ken Welch; Maria Strømme; Ragnar Ek; Bengt-Erik Mellander; Uppsala universitet; []
    Nyckelord :Engineering physics; Teknisk fysik;

    Sammanfattning : Materials with biotechnological applications and materials that interact with the biological environment play an ever increasing role in our lives and society. In order to be able to tailor specific properties of these materials to suit their intended applications, it is important to gain a deeper understanding of the relationship between the material structure and its function. LÄS MER