Videogrammetry Dynamics Measurements of a Lightweight Flexible Wing in a Wind Tunnel

Pitcher, Nathan A.; Black, Jonathan; Reeder, Mark F.; Maple, Raymond C.

doi:10.2514/6.2009-2416

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…It has been successfully used to document the heritage sites ( [5], [6]), digitization of historic cartography [7] and in geomorphological research applications [8], [9], [10]. Some of the recent studies report application of digital photogrammetry to motion problems [11] where the author has applied the technique of photogrammetry to study the aero-dynamic performance of wings of a mini-Unmanned Aerial Vehicle in a wind tunnel. The spectra of deflected shapes were obtained for stiff and flexible wings.…”

Section: Introduction To Non-contact-based Measurement Methodsmentioning

confidence: 99%

Non-contact based photogrammetric technique for testing of rigid blocky masonry arch

Naik¹,

Samson²,

Menon³

2022

ASPS Conf. Proc.

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In case of dry jointed stone structural systems, the stone blocks can be assumed to be rigid with relative predominant displacements occurring along the joints giving rise to geometric non-linearity in these systems. The testing of such discontinuous systems becomes challenging task with contact-based measuring instruments such as LVDTs as the blocks are free to displace and/or rotate with six degrees of freedom. This technique is more often used for surveying of large existing structures in the field of civil engineering and its applicability to testing of structural systems has not been explored to a larger extent yet. The photogrammetry with motion module has been observed to be the one of the most reliable and feasible methods of instrumentation for dry jointed stone structural systems. With few quality control measures adopted from taking photos to the processing stage, sufficient accuracy of measurements can be achieved. In the present study, non-contact-based technique, photogrammetry is used for testing of a typical dry-stone corbel vault taking a scaled down model of an existing vaulted gallery of Ta Prohm, Cambodia. The findings from the study have been in agreement with the observed distress in the existing corbel vaulted galleries. It has been proved to be efficient, low cost method that uses simple handheld digital cameras giving reliable results with an accuracy up to 0.4 millimetres. Thus, photogrammetry is a way forward for testing of discontinuous structural systems such as dry-stone masonry.

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Section: Introduction To Non-contact-based Measurement Methodsmentioning

confidence: 99%

Non-contact based photogrammetric technique for testing of rigid blocky masonry arch

Naik¹,

Samson²,

Menon³

2022

ASPS Conf. Proc.

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“…Aerodynamic coefficients and structural displacements from wind tunnel tests are presented in [21], and wing flexibility on a Micro Air Vehicles (MAV) is also investigated. The videogrammetry technique presented in [22] studied the deformation and attitude of static and dynamic wings in a wind-tunnel model, and non-contact videogrammetry techniques measured the dynamic behavior of flexible mini-UAV wings in wind tunnel tests [23]. The authors in [24] proposed a wing twist technique based on camera photogrammetrics, studies structure deformation and collected measurement data in flight tests using digital image correlation [25].…”

Section: Classification Of the Wing Shapementioning

confidence: 99%

Navigation and Control of Flexible Wing UAV Using Vision System

Al-Isawi¹

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This thesis presents an advanced guidance and control system for unmanned aerial vehicles (UAV) with flexible wing. The control system is based on a stereo vision system and advanced fuzzy logic algorithms that can detect wing deflections and shapes. In general, this sensor has the capability, reliability, and performance of similar traditional control sensors, and provides reliable visual information that is useful for designing different control systems. The thesis proposes a novel Deflection-Detection-Vision-System (DDVS) to control a flexible wing of unmanned aerial vehicle (UAV). Ph.D. program advisor, Professor Jurek Z. Sasiadek, for his continued support and guidance. He provided advice, opportunities, and assistance that greatly enhanced my research experience. Many thanks to my mother, my father, and my brothers for the patience and the support in all my choices, no matter what they were. In particular, I thank my lovely wife and my children "Fatima, Mohammed Ridha and Zainab" for their company and understanding during this thesis activity. Last but not certainly least, I would also like to thank my friends and fellow students for the great time spent together and the experiences shared. v

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“…[61] presents aerodynamic coefficients and structural displacements from wind tunnel studies and wing flexibility on Micro Air Vehicles (MAV). Non-contact videogrammetry techniques examined the dynamic behaviour of flexible mini-UAV wings in wind tunnel experiments [62]. In contrast, videogrammetry techniques studied the deformation and attitude of static and dynamic wings in a wind tunnel model [63].…”

Section: Classification Of the Wing Shapementioning

confidence: 99%

Control of Unmanned Aerial Vehicle with Wing Shape Identification using Vision System and Sensor Fusion

Adoghe¹

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This thesis presents a Deflection-Detection-Vision-System (DDVS) for unmanned aerial vehicles (UAV) fixed-wing for control and navigation. This technique allows measurement of the fixedwing shape, deflection, and identification of the aerodynamic coefficient acting on the system, using information from the stereo camera and strain gauge. It determines specific points to identify the wing's shape and deflection. The model UAV is equipped with a stereo camera fixed at the top rear end of the device and strain gauges placed at eight different points marked on the wing. Both sensors measure the deflection in chosen locations simultaneously. The DDVS performance and dynamic parameters are tested in a wind tunnel at speeds ranging from 10 km/h to 35 km/h, angles of attack (AOA), and roll angles ranging from 0 degrees to 30 degrees, respectively. An image acquisition, feature extraction, matching process, 3D reconstruction, and stereo camera calibration are presented in this thesis as a part of proposed identification procedure. This approach measures the wing deflection at each selected point and identifies the maximum deflection location based on various aerodynamic conditions such as wind speed, AOA, and roll angle. The drag and lift forces were obtained using the wing's surface area, and the experiment shows that less force is required for lifting as the AOA increases. The DDVS was implemented in a UAV and tested in the wind tunnel. Extensive experiments were conducted to determine the deflection of the wing in the function of flight parameters like angle of attack, roll angle, and flow velocity. The experimental results have shown that the integration of strain gauge and vision system sensors identify wing deflections accurately. Extensive simulation results were compared with the experimental results and demonstrated that the proposed method-based sensor fusion could be used even in the most demanding environment. I would like to thank Almighty God and all of the people who encouraged and supported me during the undertaking of this research. To begin, I would like to express my gratitude to my Ph.D.program advisor, Professor Jurek Z. Sasiadek, for his continued guidance and support. He provided advice, opportunities, and assistance that greatly enhanced my research experience.Many thanks to my mother, my father, and my brothers and sisters for their patience and support. In particular, I thank my lovely wife and my children "Marvellous, Katriel, and Hallel" for their company and understanding during this thesis activity.Last but not certainly least, I would also like to thank my friends and fellow students for the great time spent together and the experiences shared. v

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Videogrammetry Dynamics Measurements of a Lightweight Flexible Wing in a Wind Tunnel

Abstract: Videogrammetry is a measurement technique well

Cited by 5 publications

References 15 publications

Non-contact based photogrammetric technique for testing of rigid blocky masonry arch

Non-contact based photogrammetric technique for testing of rigid blocky masonry arch

Navigation and Control of Flexible Wing UAV Using Vision System

Control of Unmanned Aerial Vehicle with Wing Shape Identification using Vision System and Sensor Fusion

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