Full-Field Dynamic Strain on Wind Turbine Blade Using Digital Image Correlation Techniques and Limited Sets of Measured Data From Photogrammetric Targets

Carr, Jennifer; Baqersad, Javad; Niezrecki, Christopher; Avitabile, Peter

doi:10.1007/s40799-016-0082-0

Cited by 32 publications

(7 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…IOP Publishing doi:10.1088/1742-6596/2468/1/012121 2 due to its high measurement accuracy, simple experimental equipment, and wide measurement range. The Stereo DIC method solves the displacement of each pixel in two digital images before and after deformation or displacement through a related algorithm, thus enabling full-field deformation or strain solution [13][14][15][16]. The advantage of the Stereo DIC approach is that the measurement can be carried out without damaging the aircraft's surface.…”

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.

View full text Add to dashboard Cite

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.

show abstract

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.

View full text Add to dashboard Cite

show abstract

“…Digital image correlation (DIC) has been proved to be a powerful non-contact technique for deformation measurement 4 , 5 . And it has been employed in many fields due to its multi-scale, non-contact and full-field measurement 6 , 7 . Recently, with the development of binocular stereo vision and high-speed photography technology, stereo digital image correlation (stereo-DIC or 3D-DIC) has been widely applied in dynamic 3D shape and deformation measurements 8 – 10 .…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional shape and deformation measurement on complex structure parts

Guo

Chen

et al. 2022

Sci Rep

View full text Add to dashboard Cite

Stereo digital image correlation technique (stereo-DIC or 3D-DIC) has been widely used in three-dimensional (3D) shape and deformation measurement due to its high accuracy and flexibility. But it is a tough task for it to deal with complex structure components because of the severe perspective distortion in two views. This paper seeks to resolve this issue using a single-camera system based on DIC-assisted fringe projection profilometry (FPP). A pixel-wise and complete 3D geometry of complex structures can be reconstructed using the robust and efficient Gray-coded method based on a FPP system. And then, DIC is just used to perform the temporal matching and complete full-field pixel-to-pixel tracking. The in- and out-of-plane deformation are obtained at the same time by directly comparing the accurate and complete 3D data of each corresponding pixel. Speckle pattern design and fringe denoising methods are carefully compared and chosen to simultaneously guarantee the measuring accuracy of 3D shape and deformation. Experimental results demonstrate the proposed method is an effective means to achieve full-field 3D shape and deformation measurement on complex parts, such as honeycomb structure and braided composite tube, which are challenging and even impossible for the traditional stereo-DIC method.

show abstract

“…Helicopter rotor blades, wind turbine blades, gears and bearings of industry machinery, and ships' propellers are some of the real-life applications. The full-field movement and strain measurement of rotating structures can provide important technical support for structural optimization designs, mechanical performance analysis, life-span evaluations, health monitoring, and so on [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Strain accuracy enhancement of stereo digital image correlation for object deformation with large rotations

Wu¹,

Zhao²,

Liu³

et al. 2022

Meas. Sci. Technol.

View full text Add to dashboard Cite

We propose a full-field stereo digital image correlation (DIC) strain measurement method in order to overcome the poor accuracy while measuring the deformation under large rotations. Such drawback comes from the missing of considering rotation movements of the deformed objects when calculating their strain values. To address that, we first used a DIC matching algorithm combined with rotated subset and feature point detection to obtain displacement fields. By employing a singular value decomposition (SVD) method, we then can calculate rotation matrices of the strain windows before and after deformations. Finally, in order to eliminate the strain errors caused by rotation, we introduced the rotation matrices into the classical pointwise least square (PLS) DIC strain calculation method. Both numerical simulations and experiments are performed, and the accuracy and effectiveness of the proposed method are confirmed by the experimental results.

show abstract

Full-Field Dynamic Strain on Wind Turbine Blade Using Digital Image Correlation Techniques and Limited Sets of Measured Data From Photogrammetric Targets

Cited by 32 publications

References 16 publications

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

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

Three-dimensional shape and deformation measurement on complex structure parts

Strain accuracy enhancement of stereo digital image correlation for object deformation with large rotations

Contact Info

Product

Resources

About