Experimental Aeroelastic Models Design and Wind Tunnel Testing for Correlation with New Theory

Tang, Deman; Dowell, Earl H.

doi:10.3390/aerospace3020012

Cited by 26 publications

(17 citation statements)

References 48 publications

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“…Additionally, installed sensors are invasive to the experimental model, locally changing its shape and/or mass, while providing only discrete information, typically with a relatively low spatial resolution. As a result, experimental reference data from wind tunnel measurements that can be used for the comparison with theoretical results and for calibrating computational models are typically limited to only a few quantities that are relatively easy to obtain, such as the wingtip deflection or the frequency of the dynamic motion [4].…”

Section: Aeroelasticity Dynamicmentioning

confidence: 99%

Determination of Collar’s Triangle of Forces on a Flexible Wing based on Particle Tracking Velocimetry Measurements

Mertens

Oudheusden

Sodja

et al. 2021

AIAA Scitech 2021 Forum

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Section: Aeroelasticity Dynamicmentioning

confidence: 99%

Determination of Collar’s Triangle of Forces on a Flexible Wing based on Particle Tracking Velocimetry Measurements

Mertens

Oudheusden

Sodja

et al. 2021

AIAA Scitech 2021 Forum

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“…An aeroelastic model of the towering structure was manufactured in this study to make sure that the experimental model and prototype had the same frequency, mode shape, and damping ratio. It was not demanded to ensure that each frequency and mode shape of the prototype and the model is same, because the first mode dominates the dynamic behavior of towering structure, while the higher mode contributed little to it; thus the first frequency and the first mode shape of the prototype and the model should be the same [19]. e geometric scaling was set as 1 : 25, so the model was 1.7 meters high.…”

Section: Model Of the Frame-supportingmentioning

confidence: 99%

New Approach for Vibration Suppression through Restrictors on Towering Steel Columns with Supporting Frame

Tan

Fan

et al. 2020

Mathematical Problems in Engineering

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Towering steel column with supporting frame is a typical equipment in chemical process engineering. Here, displacement restrictors are proposed to restrict the displacement of the towering and slender equipment while making the column to be structurally nonlinear and statically indeterminate. This study investigated on along-wind and cross-wind vibration characteristics of such equipment with the restrictors experimentally and numerically. A field test is carried out to measure the natural frequency and damping ratio of the 42.5-meter-high equipment vibrating in the wind, which is the prototype of the experimental model. A noncontact excitation system was applied on the experimental model to simulate the wind loads. The displacements and strains of the experimental model are collected under different frame types by changing the heights of displacement restrictors. The numerical simulation and experimental results showed that the height of displacement restrictors has a great influence on the vibration intensity of the equipment. An optimum location, recommended as about 40% of the height, could decrease the vibration intensity and enhance the safety of the equipment. Based on the results, a simplified formula in which the natural frequency and the damping ratio dominate the dynamic behavior of along-wind and cross-wind vibration, respectively, is derived from multi-degrees-of-freedom system. It could be furtherly utilized to predict the amplitude ratio of two structures and select a better design featuring an efficient vibration suppression performance. This work presents an important design guide to the frame-supporting towering process equipment and is of great significance to an economical and safety design.

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“…16 Forward swept wings lead air onto the rear wing set, causing for more stability and efficiency. 11,12 Corrective components, such as winglets, are not required to maintain flight stability in an aircraft that uses forward swept wings due to the increased airflow displaced onto the rear wing set. Forward swept wings are predicted to be as, if not more, efficient than rear swept wings, 15,16 which means that the forward swept orientation could generate more lift and less drag when compared to rear swept wings.…”

Section: Forward Swept Wingsmentioning

confidence: 99%

Boundary-Layer Flow Dynamics Concerning Forward Swept Wings

Mirchandani¹

2019

IJHSR

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Air travel has two major issues; plane crashes caused by loss of control and its contribution to pollution. Aircrafts could employ a new wing orientation, forward swept wings, which would increase the effectiveness of the rear wing set, thereby increasing the control given to the pilot. Other studies suggest that forward swept wings are more efficient than the contemporary rear swept wings. If aircrafts became more efficient, then they could fly the same distance without consuming as much fuel, thereby decreasing air pollution emissions. This experiment measured the efficiency ratio (lift-to-drag ratio) as a proxy for fuel efficiency. I utilized force sensors to measure lift (upward force) and drag (frictional force) on 3D printed wing models in order to create the efficiency ratio (lift/drag). This ratio, in turn, allows for comparisons of efficiency concerning differing sweep orientations. It was found that forward swept wings were more efficient than rear swept wings at subsonic speeds. This warrants future research concerning the fuel efficiency of forward swept wings at varying speeds and angles of attack in direct comparison with rear swept wings.

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Experimental Aeroelastic Models Design and Wind Tunnel Testing for Correlation with New Theory

Cited by 26 publications

References 48 publications

Determination of Collar’s Triangle of Forces on a Flexible Wing based on Particle Tracking Velocimetry Measurements

Determination of Collar’s Triangle of Forces on a Flexible Wing based on Particle Tracking Velocimetry Measurements

New Approach for Vibration Suppression through Restrictors on Towering Steel Columns with Supporting Frame

Boundary-Layer Flow Dynamics Concerning Forward Swept Wings

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