Application of high-speed videography for in-flight deformation measurements of aircraft propellers

Stasicki, Boleslaw; Boden, Fritz

doi:10.1117/12.822046

Cited by 13 publications

(13 citation statements)

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“…These are some of the problems that are prominent in practical engineering: The size of the structural parts to be measured is large, and the accuracy requirements are relatively high. Large structural components themselves are somewhat difficult to measure [3][4][5]. The measurement of large structural parts of aircraft is carried out in a harsh and complex environment.…”

Section: Introductionmentioning

confidence: 99%

External Measurement System for Aircraft Structural Parts Based on Digital Image Correlation in Signal-limited Spaces

Cai

Liu

Yang

et al. 2023

J. Phys.: Conf. Ser.

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An experimental study was performed on the application of the digital image correlation (DIC) technique to characterize aircraft components for which accurate time information is required. This study builds an aircraft external measurement system based on Stereo DIC. This system obtains real-time satellite time information from a GPS clock source and transmits it to a trigger unit. A camera acquires this information and displays it on the image. This solves the problem that some closed laboratories can use only computer time and cannot obtain accurate satellite time when using camera measurements. Moreover, we verify the reliability and accuracy of this approach, finding an average angular accuracy of better than 0.02 degrees and a relative error of less than 1%. Using the binocular Stereo DIC system, the accuracy of the measurements is clarified for specific conditions. Furthermore, we use this system to measure simulated aircraft landing gear, which moves at an angular velocity of 52.4 °/ s over a distance of 5 m with a wide field of view of 16.8°. The satellite time information acquired by the camera and the time information of the captured time targets are highly stable. The system’s reliability is demonstrated for use in practical engineering, contributing to the engineering application of Stereo DIC for external aircraft measurements.

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Section: Introductionmentioning

confidence: 99%

External Measurement System for Aircraft Structural Parts Based on Digital Image Correlation in Signal-limited Spaces

Cai

Liu

Yang

et al. 2023

J. Phys.: Conf. Ser.

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“…Image-based methods have a number of advantages over traditional methods, such as being non-contact or able to acquire full displacement or deformation elds, as opposed to point-to-point techniques [5]. As such, their use does not inuence the movement/deformation of the object under study, which is important in many applications [3,6].…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, image methods have been used to perform measurements in rotating objects, ranging from shafts [7] to propellers [6,8] and wind turbines [9]. Many of these works, such as [6,3,10,11,12,13,9,14,15,8,16,17], involve the acquisition of shape and displacements using 3D digital image correlation.…”

Section: Introductionmentioning

confidence: 99%

“…Another important factor when performing measurements in rotating objects is that the camera should be precisely synchronized with the rotation to record the target object always in the same position [6]. However, in [16,17], it was noted that when using a static reference, its positioning is also important, as misalignments between the acquired images in stationary and the rotating situations will cause rigid-body rotations that may hide the sought-after deformations.…”

Section: Introductionmentioning

confidence: 99%

“…Winstroth and Seume suggest, as a nal remark in [18], that one way to remove these rotations could be to realign the deformed point clouds with the reference one by minimizing the distance between them close to the blade hub. Additionally, this could also be approached using a relative technique, where the reference image is also acquired during rotation, as suggested by Stasicki and Boden [6] but with a dierent goal, which was that of reducing motion blur eects.…”

Section: Introductionmentioning

confidence: 99%

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Correction of rigid body motion in deformation measurement of rotating objects

2018

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When using image-based measurement solutions for monitoring the displacement of rotating objects, it is necessary to trigger the image acquisition system at precise positions. Triggering errors lead to articial rigid motions in the output that are hard to remove independently. Thus, a methodology was developed to enable the removal of these errors while maintaining the true rotations, such as those relating to the angle of attack. The proposed methodology involves detecting an object's axis and centre of rotation and then using that knowledge to correct acquired deformation data. Additionally, it also enables the representation of displacements in a more representative coordinate system, i.e., one that includes the rotation axis. While common solutions for this problem use either manually positioned references or track a single-point's rotation, the proposed methodology is based on a least-squares approach. This results in a more accurate measurement of the rotation axis and, thus, improves the quality of the results. The methodology was experimentally validated and it was shown that its implementation is accurate, with errors below 3 %. Additionally, it was applied to an actual experimental situation and the results were compared to the uncorrected data, while highlighting the most relevant improvements.

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