A new approach to measuring model deflection

Draai, R.K. Van der; Schinkel, R.P.M. van; Telesca, Alessio

doi:10.1109/iciasf.1999.827173

Cited by 3 publications

(1 citation statement)

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“…Typical shape measurement techniques such as PGM (Projected Grid Method), PMI (Projection Moiré Interferometry) and SPR (Stereo Pattern Recognition) have been used in several wind tunnel tests. Van der Draai et al [1] described two different Moiré techniques such as the Painted Pattern Method (PaPM) and the Projection Pattern Method (PrPM) which tracked the motion of specific points placed on the structure surface for the deformation measurements of a dummy wing. Fleming et al [2][3] used PMI to obtain near instantaneous helicopter blade deformations for HART-I (Higher harmonic control Aeroacoustic Rotor Test).…”

Section: Introductionmentioning

confidence: 99%

Development of a Point Tracking System for Measuring Structural Deformations Using Commercial Video Cameras

Kim¹,

Kim²,

Park³

et al. 2009

International Journal of Aeronautical and Space Sciences

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This paper deals with the creation of a new, low-cost point/position tracking system that can measure deformations in engineering structures with simple commercially widespread cameras. Though point tracking systems do exist today, such as Stereo Pattern Recognition (SPR) and Projection Moiré Interferometry (PMI) systems, they are far too costly to use to analyze small, simple structures because complex optical components such as large flashes, high-resolution cameras and data acquisition systems with several computers are required. We developed a point tracking system using commercial cameras. This system used IR LEDs and commercial IR CCD cameras to minimize the interference posed by other extraneous light sources. The main algorithm used for this system is an optical point tracking algorithm, which is composed of the point extraction algorithm and the point matching algorithm for 3-D motion estimation. a series of verification tests were performed. Then, the developed point tracking system was applied to measure deformations of an acrylic plate under a mechanical load. The measured deformations of the acrylic plate matched well with the numerical analysis results. The results indicate that the developed point tracking system is reliable enough to measure continuous deformed shapes of various engineering structures.

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Section: Introductionmentioning

confidence: 99%