Flexible DIC System for Wind Tunnel Testing of Lightweight Structures

Khare, Vivek; Kamle, Sudhir; Sharma, Shruti

doi:10.1061/jaeeez.aseng-4559

Cited by 3 publications

(3 citation statements)

References 48 publications

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“…And p wik is determined using the prior information of the target. prwik = W ri p wik (7) For the points on ST-1 (i.e. i = 1), the transformation matrix is an identity matrix,…”

Section: The Model Of Small Target Image Splicingmentioning

confidence: 99%

“…On the other hand, the homography matrix relates the transformation between two planes, and it has the same form as equation (7). The transformation matrix is regarded as the homography matrix between the small target plane and the virtual large target plane.…”

Section: The Model Of Small Target Image Splicingmentioning

confidence: 99%

“…In addition, owing to the increasing demand for the measurement of large-size structures (such as wind tunnels [7] and aero-engine rotating blades [8]), binocular vision systems with a large field-of-view (FOV) are required [9]. To calibrate the vision systems with a large FOV, researchers have used the one-dimensional (1D) target containing multiple points [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Calibration method for binocular vision system with large field of view based on small target image splicing

Li,

Xu,

Zhang

et al. 2024

Meas. Sci. Technol.

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In vision measurement, camera calibration has a significant impact on measurement precision. The classical target-based calibration methods require the target to occupy more than one-third of the field of view. A small-size target that does not meet the requirements results in poor calibration accuracy, while an appropriate large-size target is difficult to manufacture and inconvenient to operate. In view of the above problem, we propose a flexible and accurate calibration method based on small target image splicing to calibrate the binocular vision system with a large field of view. The spliced images and virtual large targets are constructed to extend the target size, providing better flexibility for calibration. Moreover, an optimization objective function integrating two constraints in the imaging plane and measurement space is presented to improve the calibration accuracy during the parameter optimization process. The simulation experiments and actual experiments are carried out to test the performance of the proposed method. The results demonstrate that the calibration accuracy of the proposed method using a small target is equivalent to that of Zhang’s method using a large target. Additionally, when using a same-size target, the parameter error of the proposed method is less than that of Zhang’s method, and the proposed method reduces the distance measurement error from 1.169mm to 0.208mm compared to Zhang's method.

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“…And p wik is determined using the prior information of the target. prwik = W ri p wik (7) For the points on ST-1 (i.e. i = 1), the transformation matrix is an identity matrix,…”

Section: The Model Of Small Target Image Splicingmentioning

confidence: 99%

Section: The Model Of Small Target Image Splicingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Calibration method for binocular vision system with large field of view based on small target image splicing

Li,

Xu,

Zhang

et al. 2024

Meas. Sci. Technol.

View full text Add to dashboard Cite

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Measurement of wing motion, deformation, and inertial forces of a biomimetic butterfly

Yang,

Wei,

Zeng

et al. 2024

Review of Scientific Instruments

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This paper introduces a method for measuring wing motion, deformation, and inertial forces in bio-inspired aircraft research using a camera motion capture system. The method involves placing markers on the wing surface and fitting rigid planes to determine the wing’s spatial axis. This allows for describing the wing’s rigid motion and obtaining deformation characteristics, such as deflection, twist angle, and gap distance of the forewing and hindwing. An image-based method is proposed for determining wing mass distribution, mass blocks, and mass points for inertial force measurement. The study addresses wing motion, deformation, and inertial force measurement in a real butterfly-like flapping wing vehicle and demonstrates the effectiveness of the approach. The results reveal that inertial forces play a negligible role in the generation of lift peaks and contribute minimal lift during the entire flapping cycle. Furthermore, a transitional phase between downstroke and upstroke is found in flexible wing motion, which has high lift production. This measurement approach offers a rapid and effective solution to experimental challenges in bio-inspired aircraft design and optimization.

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