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Projecte llegit

Títol: Numerical simulation and validation of ultrasonic de-icing system

Estudiants que han llegit aquest projecte:

Director/a: ZOLA, ENRICA VALERIA

Departament: ENTEL

Títol: Numerical simulation and validation of ultrasonic de-icing system

Data inici oferta: 12-02-2018     Data finalització oferta: 12-02-2018


Estudis d'assignació del projecte:
    Tipus: Individual
     
    Lloc de realització: ERASMUS
     
    Paraules clau:
    Piezoelectric, de-icing, stress, PZT, frequency.
     
    Descripció del contingut i pla d'activitats:

    The purpose of the project has as main target find an alternative de-icing device
    better than the used nowadays, that consume big amounts of energy and heat.
    Through the physics of ultrasonic, by piezoelectric materials used in
    transducers.
    By the transducers PZT-4, a series of researches and simulations by software
    has been done to determine which configuration of this PZT suits better the de-
    icing effect.
     
    Overview (resum en anglès):

    This work presents the analytic and experimental research of de-icing method
    with piezoelectric transducer as actuators.
    For the reason of flight conditions like altitude, high and humidity. To meet the
    requirements for flight, deicing measures must be taken in consideration.
    There are lots of existing deicing methods, but the main problem is that the
    loss of power with them is very big increasing the consumption of fuel and
    decreasing the efficiency of the flight. With the development of piezoelectric
    ceramic technology, shear vibration deicing is more concerned for their low
    power consumption. Shear stress between surface and ice is generated by the
    forced vibration which is driven by piezoelectric.
    The device achieves the deicing purpose activating resonant frequencies of a
    structure using piezoelectric ceramic actuators to generate enough shear
    stress at the interface, between the surface and ice, to break the adhesion
    stress between them.
    In this study, we study the effect of shear stress generated for different
    distances between ceramic piezoelectric, and then analyze the relations of the
    shear stress and frequency.
    First, a numerical method was validated to assist the design of such systems.
    Numerical simulations were performed for the case of a flat plate testing the
    natural modes and harmonic response by the software ANSYS, which proves
    the feasibility to remove ice by piezoelectric ceramic actuator in theory.
    And then, validated experimentally. The model was then used to study
    important design parameters such as actuator positioning and the distance
    between them.
    .
    The results show that considering the unique variable the distance between
    transducers the behavior of the system tends to a dumped wave where at
    some distance it is reached some peak values able to break the ice that are
    decreasing in sequence by the distance. The optimal point for this particular
    case it was when the transducers where settled between 0,17 cm to each one.

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