System and method for using pressure-sensitive paint (PSP) to analyze unsteady aerodynamic loads on vehicles

    公开(公告)号:US11698325B1

    公开(公告)日:2023-07-11

    申请号:US16914467

    申请日:2020-06-28

    IPC分类号: G01M9/04 G01L27/00 G01L11/02

    CPC分类号: G01M9/04 G01L11/02 G01L27/002

    摘要: A method for measuring and computing unsteady loads using unsteady pressure-sensitive paint (uPSP) data includes performing an in-situ calibration using an average of pixels of a portion of an image captured of a surface painted with pressure-sensitive paint. The method also includes dividing an average static pressure by an intensity for each region of interest (ROI) in terms of time to produce a ratioed intensity measuring an intensity fluctuation. The method further includes producing a pressure-time history from the in-situ calibration and the measured intensity fluctuation. The method also includes calculating a fluctuating force by multiplying the produced pressure-time history by an area of pixels in each ROI, and converting a time signal to a frequency, and producing a power spectral density (PSD) to compare frequency content to determine an amount of energy at a certain frequency band.