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  • Institute of Modern Russian Culture Newsletter 53.2007.pdf

    Generic Work thumbnail: Institute of Modern Russian Culture Newsletter 53.2007.pdf
    Type:
    Generic Work
    摘抄:
    Institute of Modern Russian Culture Newsletters 1979-2018. The newsletter is distributed biannually and provides information and events connected to the IMRC. The newsletter contains lists of books, journals, and catalogs related to the art and culture of Russia. It also lists events and exhibitions that took place during the year.
    作者:
    Bowlt, John and Konecny, Mark
    提交者:
    Mark Konecny
    上传日期:
    08/07/2018
    更改日期:
    08/22/2018
    创建:
    2007-02
    证书:
    Attribution 4.0 International

  • Experimental estimation of a D-shaped cylinder wake using body-mounted sensors

    Article thumbnail: Experimental estimation of a D-shaped cylinder wake using body-mounted sensors
    Type:
    Article
    摘抄:
    The effectiveness of a small array of body-mounted sensors, for estimation and eventually feedback flow control of a D-shaped cylinder wake is investigated experimentally. The research is aimed at suppressing unsteady loads resulting from the von-Kármán vortex shedding in the wake of bluff-bodies at a Reynolds number range of 100–1,000. A low-dimensional proper orthogonal decomposition (POD) procedure was applied to the stream-wise and cross-stream velocities in the near wake flow field, with steady-state vortex shedding, obtained using particle image velocimetry (PIV). Data were collected in the unforced condition, which served as a baseline, as well as during influence of forcing within the “lock-in” region. The design of sensor number and placement was based on data from a laminar direct numerical simulation of the Navier-Stokes equations. A linear stochastic estimator (LSE) was employed to map the surface-mounted hot-film sensor signals to the temporal coefficients of the reduced order model of the wake flow field in order to provide accurate yet compact estimates of the low-dimensional states. For a three-sensor configuration, results show that the estimation error of the first two cross-stream modes is within 20–40% of the PIV-generated POD time coefficients. Based on previous investigations, this level of error is acceptable for a moderately robust controller required for feedback flow control.
    作者:
    Cohen, Kelly; Stalnov, Oksana; Fono, Ilan; Seifert, Avi, and Palei, Vitali
    提交者:
    Kelly Cohen
    上传日期:
    02/10/2017
    更改日期:
    04/05/2017
    创建:
    2007-02
    证书:
    All rights reserved