Three-Dimensional Acceleration Measurement Using Videogrammetry Tracking Data |
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Authors: | J Leifer B J Weems S C Kienle A M Sims |
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Institution: | (1) Department of Engineering Science, Trinity University, One Trinity Place, San Antonio, TX 78212, USA |
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Abstract: | In order to evaluate the feasibility of multi-point, non-contact, acceleration measurement, a high-speed, precision videogrammetry
system has been assembled from commercially-available components and software. Consisting of three synchronized 640 × 480
pixel monochrome progressive scan CCD cameras each operated at 200 frames per second, this system has the capability to provide
surface-wide position-versus-time data that are filtered and twice-differentiated to yield the desired acceleration tracking
at multiple points on a moving body. The oscillating motion of targets mounted on the shaft of a modal shaker were tracked,
and the accelerations calculated using the videogrammetry data were compared directly to conventional accelerometer measurements
taken concurrently. Although differentiation is an inherently noisy operation, the results indicate that simple mathematical
filters based on the well-known Savitzky and Golay algorithms, implemented using spreadsheet software, remove a significant
component of the noise, resulting in videogrammetry-based acceleration measurements that are comparable to those obtained
using the accelerometers. |
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