This paper introduces a novel concept of the image-processing technique to visualize a two-dimensional flow field and to generate streaks with embedded time marks in real time. Grey levels of a pixel are used in this work to encode the temporal information rather than the intensity of particle trajectories used in conventional image-processing systems. To do this, the incoming video image is first binarized by a step function predefined in an input look-up table, with the height of the step varying with time to bear temporal marks. A real-time arithmetic-logic unit and an image-frame buffer are used to accumulate the images. These processes result in continuous streaks with embedded time marks which have many advantages over those recorded by conventional techniques. Pseudo-color output look-up tables and color monitor provide more direct and intuitive means for human visual perception. This color-coded particle tracking velocimetry was applied to investigate natural convection in an enclosure heated from below with an isothermal extrusion. By quantifying the color-coded streaks, velocity vectors were obtained at a discrete number of points with less labor. The present technique provides an elaborate tool for simultaneous qualitative and quantitative realizations of steady and slowly varying flow felds.
No abstract
The purpose of this study is to design a high‐shock acceleration apparatus that can be used in a laboratory, alleviating the need for expensive and complex experiments. The key components of this device include a detonator, dynamite, a shock transmission bar, the housing for the test object, and an accelerometer. The device uses the detonation of the dynamite to generate instantaneous accelerations of up to 105 m s−2, which last for hundreds of microseconds. The acceleration forces over the most significant frequency range of the system were analyzed using the shock response spectrum (SRS) method. The device output provides a test sample of 1 kg with the high‐acceleration shock condition required by the Mil‐Std‐810F shock test specification.
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