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Aerodynamic Surface

The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform

W. Nitsche – 1st expert on this subject based on the ideXlab platform

  • AeroMEMS Wall Hot-Wire Anemometer on Polyimide Substrate Featuring Top Side or Bottom Side Bondpads
    IEEE Sensors Journal, 2007
    Co-Authors: U. Buder, W. Nitsche, A. Berns, R. Petz, E. Obermeier

    Abstract:

    Design, manufacturing, calibration, and basic characterization of a microelectromechanical systems (MEMS) wall hot wire sensor on a flexible polyimide substrate are presented. A configuration exhibiting bond pads on the top side of the foil, as well as an improved setup featuring a through-foil metallization and bottom side bond pads were established. Both sensor designs make use of a highly sensitive nickel thin-film resistor spanning a reactive ion etched cavity in a polyimide substrate. The polyimide base material enables the sensor to be adapted to curved Aerodynamic Surfaces, e.g., airfoils and turbine blades. A mismatch of curvature of Aerodynamic Surface and silicon sensor Surface, as observed with previously presented MEMS hot-wire anemometers is avoided. The combination of polyimide’s low thermal conductivity and a cavity featuring FEM-optimized dimensions accounts for a very low-power consumption (

  • AeroMEMS wall hot-wire anemometer on polyimide foil for measurement of high frequency fluctuations
    SENSORS 2005 IEEE, 2005
    Co-Authors: U. Buder, A. Berns, E. Obermeier, R. Petz, W. Nitsche

    Abstract:

    Design, simulation, manufacturing, calibration, and basic characterization of a MEMS wall hot-wire anemometer is presented. A highly sensitive nickel thin film resistor spanning a reactive ion etched cavity in a polyimide foil is employed. This sensor is the first in literature to feature both a thermally insulating cavity and a flexible base material. The polyimide base material allows adopting of the sensor to Aerodynamic Surfaces, e.g. airfoils and turbine blades. A mismatch of curvature of Aerodynamic Surface and silicon sensor Surface, as observed with previously presented MEMS hot-wire anemometers, is avoided. The combination of polyimide’s low thermal conductivity and a cavity featuring FEM-optimized dimensions accounts for a very low power consumption (

E. Obermeier – 2nd expert on this subject based on the ideXlab platform

  • AeroMEMS Wall Hot-Wire Anemometer on Polyimide Substrate Featuring Top Side or Bottom Side Bondpads
    IEEE Sensors Journal, 2007
    Co-Authors: U. Buder, W. Nitsche, A. Berns, R. Petz, E. Obermeier

    Abstract:

    Design, manufacturing, calibration, and basic characterization of a microelectromechanical systems (MEMS) wall hot wire sensor on a flexible polyimide substrate are presented. A configuration exhibiting bond pads on the top side of the foil, as well as an improved setup featuring a through-foil metallization and bottom side bond pads were established. Both sensor designs make use of a highly sensitive nickel thin-film resistor spanning a reactive ion etched cavity in a polyimide substrate. The polyimide base material enables the sensor to be adapted to curved Aerodynamic Surfaces, e.g., airfoils and turbine blades. A mismatch of curvature of Aerodynamic Surface and silicon sensor Surface, as observed with previously presented MEMS hot-wire anemometers is avoided. The combination of polyimide’s low thermal conductivity and a cavity featuring FEM-optimized dimensions accounts for a very low-power consumption (

  • AeroMEMS wall hot-wire anemometer on polyimide foil for measurement of high frequency fluctuations
    SENSORS 2005 IEEE, 2005
    Co-Authors: U. Buder, A. Berns, E. Obermeier, R. Petz, W. Nitsche

    Abstract:

    Design, simulation, manufacturing, calibration, and basic characterization of a MEMS wall hot-wire anemometer is presented. A highly sensitive nickel thin film resistor spanning a reactive ion etched cavity in a polyimide foil is employed. This sensor is the first in literature to feature both a thermally insulating cavity and a flexible base material. The polyimide base material allows adopting of the sensor to Aerodynamic Surfaces, e.g. airfoils and turbine blades. A mismatch of curvature of Aerodynamic Surface and silicon sensor Surface, as observed with previously presented MEMS hot-wire anemometers, is avoided. The combination of polyimide’s low thermal conductivity and a cavity featuring FEM-optimized dimensions accounts for a very low power consumption (

John R Hutchinson – 3rd expert on this subject based on the ideXlab platform

  • shake a tail feather the evolution of the theropod tail into a stiff Aerodynamic Surface
    PLOS ONE, 2013
    Co-Authors: Michael Pittman, Stephen M Gatesy, Paul Upchurch, Anjali Goswami, John R Hutchinson

    Abstract:

    Theropod dinosaurs show striking morphological and functional tail variation; e.g., a long, robust, basal theropod tail used for counterbalance, or a short, modern avian tail used as an Aerodynamic Surface. We used a quantitative morphological and functional analysis to reconstruct intervertebral joint stiffness in the tail along the theropod lineage to extant birds. This provides new details of the tail’s morphological transformation, and for the first time quantitatively evaluates its biomechanical consequences. We observe that both dorsoventral and lateral joint stiffness decreased along the non-avian theropod lineage (between nodes Theropoda and Paraves). Our results show how the tail structure of non-avian theropods was mechanically appropriate for holding itself up against gravity and maintaining passive balance. However, as dorsoventral and lateral joint stiffness decreased, the tail may have become more effective for dynamically maintaining balance. This supports our hypothesis of a reduction of dorsoventral and lateral joint stiffness in shorter tails. Along the avian theropod lineage (Avialae to crown group birds), dorsoventral and lateral joint stiffness increased overall, which appears to contradict our null expectation. We infer that this departure in joint stiffness is specific to the tail’s Aerodynamic role and the functional constraints imposed by it. Increased dorsoventral and lateral joint stiffness may have facilitated a gradually improved capacity to lift, depress, and swing the tail. The associated morphological changes should have resulted in a tail capable of producing larger muscular forces to utilise larger lift forces in flight. Improved joint mobility in neornithine birds potentially permitted an increase in the range of lift force vector orientations, which might have improved flight proficiency and manoeuvrability. The tail morphology of modern birds with tail fanning capabilities originated in early ornithuromorph birds. Hence, these capabilities should have been present in the early Cretaceous, with incipient tail-fanning capacity in the earliest pygostylian birds.