Experimental Investigation and Modeling of Flapping Wing Aerodynamics PDF Download
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Author: Zaeem A. Khan
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 226
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Book Description
Author: Zaeem A. Khan
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 226
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Book Description
Author: Christopher J. Bradshaw
Publisher:
ISBN: 9781423512400
Category :
Languages : en
Pages : 111
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Book Description
Flapping-wing propulsion was studied experimentally through Laser Doppler Velocimetry. Measurements were both time-averaged and unsteady, and were conducted on a Micro- Air Vehicle (MAV) model developed at NPS by Professors Max Platzer and Kevin Jones. The objective of this work was to further understanding of the aerodynamics of flapping-wing propulsion. In specific, this study examined separation control on the leading fixed wing due to entrainment by the trailing flapping wings. Further, a study of wake topology examined differences between the optimal and off-optimal cases. Experimental studies took place in the NPS 5' x 5' low speed wind tunnel. The model was supported on a test stand and LDV measurements of the flow field were taken. Studies were made at varying freestream velocities, angles of attack, and flapping frequencies. The test stand was instrumented with force balances to show forces in both the streamwise and vertical directions.
Author: Timothy Craig Lund
Publisher:
ISBN: 9781423537472
Category :
Languages : en
Pages : 80
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Book Description
Flapping-wing propulsion is studied experimentally and numerically. The objective of the research is to provide further insight into the aerodynamics of flapping-wing air vehicles. Experimental work is conducted in the NPS 1.5 m x 1.5 m (5 ft x 5 ft) in-draft wind tunnel. A previously constructed long-span flapping-wing model suspended by cables is used to approximate the two-dimensional nature of the numerical simulation. For this experiment, the model is configured with two wings executing plunge-only motion. Thrust is indirectly determined by using a laser rangefinder to measure streamwise displacement of the model. Results are compared with previous experimental tests. A numerical analysis is conducted using USPOT, a locally developed unsteady panel code that models two independently moving airfoils with three degrees of freedom and non-linear deforming wakes. Thrust and efficiencies are computed for harmonically oscillating airfoils. Direct comparison is made between experimental and numerical thrust measurements.
Author: Wei Shyy
Publisher: Cambridge University Press
ISBN: 1107037263
Category : Science
Languages : en
Pages : 321
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Book Description
For anyone interested in the aerodynamics, structural dynamics and flight dynamics of small birds, bats, insects and air vehicles (MAVs).
Author: Thomas J. Mueller
Publisher: AIAA
ISBN: 9781600864469
Category : Aerodynamics
Languages : en
Pages : 614
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Book Description
This title reports on the latest research in the area of aerodynamic efficency of various fixed-wing, flapping wing, and rotary wing concepts. It presents the progress made by over fifty active researchers in the field.
Author: Sean J. Duggan
Publisher:
ISBN: 9781423551676
Category :
Languages : en
Pages : 70
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Book Description
Flapping-wing propulsion is studied experimentally through thrust measurements and flow visualization. The objective of the research is to provide further insight into the aerodynamics of flapping-wing micro air vehicles (MAVs) . Experimental work is conducted in the NPS 1.5 m x 1.5 m in-draft wind tunnel. A previously constructed model is suspended by thin wires and is used to measure the thrust performance of the flapping-wing MAV. For this experiment, the model is tested in four configurations; three with varying wing mount stiffness and the fourth with an articulated pitch mechanism. Thrust is indirectly determined using a laser range-finder to measure stream-wise displacement of the model. Three methods of flow visualization are attempted to gain further insight into the flow-field around the MAV. First tufts are placed on and around the model to identify the flow-field Second, a smoke rake placed outside the tunnel is used to route smoke into the test section. Thirdly, a smoke wire system is used to produce smoke in the test section. Experimental results are compared with flow visualization results and previous experimental and numerical work.
Author: Wei Shyy
Publisher: Cambridge University Press
ISBN: 1107067987
Category : Technology & Engineering
Languages : en
Pages : 321
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Book Description
This is an ideal book for graduate students and researchers interested in the aerodynamics, structural dynamics and flight dynamics of small birds, bats and insects, as well as of micro air vehicles (MAVs), which present some of the richest problems intersecting science and engineering. The agility and spectacular flight performance of natural flyers, thanks to their flexible, deformable wing structures, as well as to outstanding wing, tail and body coordination, is particularly significant. To design and build MAVs with performance comparable to natural flyers, it is essential that natural flyers' combined flexible structural dynamics and aerodynamics are adequately understood. The primary focus of this book is to address the recent developments in flapping wing aerodynamics. This book extends the work presented in Aerodynamics of Low Reynolds Number Flyers (Shyy et al. 2008).
Author: Donald S. Woolston
Publisher:
ISBN:
Category : Oscillating wings (Aerodynamics)
Languages : en
Pages : 25
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Book Description
Aerodynamic forces and moments associated with flapping oscillations of finite wings at low speeds are considered. A comparison of theoretical and experimental results is made for a rectangular wing of aspect ratio 2. Calculated results are also given for three tapered wings of aspect ratio 3 with varying amounts of sweepback. The calculations are based on a numerical solution of the integral equation of subsonic lifting-surface theory. The experimental techniques employed are essentially those used in previous measurements associated with pitching oscillations. Theory and experiment are generally in good agreement with regard to magnitude of the forces and moments, but differ with regard to phase angle.
Author: Jonathan Edward Toomey
Publisher:
ISBN:
Category :
Languages : en
Pages : 378
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Book Description
Author: Joseph M. Martinez-Ponce
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 0
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Book Description
V-Formation and echelon formation flights can be seen by migratory birds throughout the year and have left many scientists wondering why they choose very specific formations. Experiments and analytical studies have been completed on the topic of the formation flight of birds, and have shown that migratory birds benefit aerodynamically by using these formations. However, many of these studies were completed using a fixed-wing model. While migratory birds both flap and glide while in formation, this thesis aims to design and experiment with a flapping-wing model rather than only a fixed-wing model. In order to complete this thesis, two different approaches were used to generate a flapping-wing model: The first was a computational study that used an unsteady vortex-lattice method (UVLM) solver to simulate flapping bodies. The second was an experimental design using both custom-built flapping mechanisms and commercially bought flapping drones. The computations and various experimental trials revealed that there is indeed an aerodynamic benefit from flying in either v-formation or echelon flight, or at least that each row of birds experiences a change in aerodynamic effect.
