Results 141 to 150 of about 444,446 (306)
Analytical observations on the aerodynamics of a delta wing with leading edge flaps [PDF]
The effect of a leading edge flap on the aerodynamics of a low aspect ratio delta wing is studied analytically. The separated flow field about the wing is represented by a simple vortex model composed of a conical straight vortex sheet and a concentrated
Oh, S., Tavella, D.
core +1 more source
Waveguide Photoactuators: Materials, Fabrication, and Applications
Advanced Robotics Research, EarlyView.Waveguide photoactuators convert guided light into mechanical motion. Their tethered‐flexible design enables minimally invasive surgery and confined‐space robotics. This review aims to guide materials selection, device design, and system integration, accelerating the transition of waveguide photoactuators from laboratory prototypes to versatile ...
Minjie Xi +4 more
wiley +1 more source
Preliminary flight-determined subsonic lift and drag characteristics of the X-29A forward-swept-wing airplane [PDF]
The X-29A subsonic lift and drag characteristics determined, met, or exceeded predictions, particularly with respect to the drag polar shapes. Induced drag levels were as great as 20 percent less than wind tunnel estimates, particularly at coefficients ...
Hicks, John W., Huckabine, Thomas
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Numerical Modeling of Photothermal Self‐Excited Composite Oscillators
Advanced Robotics Research, EarlyView.We present a numerical framework for simulating photothermal self‐excited oscillations. The driving mechanism is elucidated by highlighting the roles of inertia and overshoot, as well as the phase lag between the thermal moment and the oscillation angle, which together construct the feedback loop between the system state and the environmental stimulus.
Zixiao Liu +6 more
wiley +1 more source
Design of Hydraulic Induced Bidirectional Coupling Coiled Tubing Drag Reducer
Shiyou jixie, 2020 The low rigidity of the coiled tubing makes it easy to buckle during running or drilling, which leads to increased drag and even locking. To address the problem, based on the Coanda effect and the Carmen vortex effect, a hydraulically induced ...
Dou Yihua +3 more
doaj
Aircraft surface coatings [PDF]
A series of studies in which films and liquid spray-on materials were evaluated in the laboratory for transport aircraft external surface coatings are summarized. Elastomeric polyurethanes were found to best meet requirements.
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PowdersParticles travelling within and interacting with any fluid media are found in both natural phenomena and industrial processes. Through these interactions, the particles experience a drag force, heavily influenced by their morphology, and significantly affecting their dynamics.
Sadaf Maramizonouz, Sadegh Nadimi
openaire +1 more source
Stochastic Drag Analysis via Polynomial Chaos Uncertainty Quantification
51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2013 In this paper, uncertainty quantification approaches are applied to aerodynamic data analyzed by a far-field drag breakdown approach. By the use of the drag breakdown approach, total drag of an airfoil configuration can be decomposed into three physical and one unphysical drag components, that are wave, viscous, induced and spurious drag components ...
openaire +2 more sources
A Soft Robotic Fish With a Dielectric Elastomer Actuator Body and Negative Stiffness Spine
Advanced Robotics Research, EarlyView.This work introduces a bio‐mimetic soft robotic fish driven by fiber‐reinforced dielectric elastomer actuators integrated as its body. By prestretching this active skin against a flexible spine, a negative stiffness system is created, enabling large‐amplitude bending.
Markus Koenigsdorff +4 more
wiley +1 more source