Download or read book Experimental Investigation Into the Aerodynamic Performance of Both Rigid and Flexible Wing Structured Micro Air Vehicles written by Anthony M. DeLuca and published by . This book was released on 2004-03-01 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Air Force Research Lab, Munitions Directorate, Eglin Air Force Base, Florida has designed a man-portable carbon-fiber Micro-Air-Vehicle (MA V) used for on-the-spot surveillance by Special Operations Forces (SOF) for enemy reconnaissance as well as post-strike Battle Damage Assessment (BDA).The main goals of this experiment are: 1) characterize the flow quality of the new AFIT 3' x 3' wind tunnel and 2) determine the aerodynamic performance characteristics of the 24" span, 6" chord flexible and rigid wing MA V s. The turbulent intensity of the wind tunnel was approximately 2%. Both MA Vs had an average lift slope within 3.5% of the theoretical value. Flexible wings deformed in response to perturbations in local flow field conditions, promulgating the delay of wing stall by nearly double. Aeroelastic effects begin to dominate low speed, laminar Reynolds number effects at tunnel velocities greater than 30 miles per hour. The flexible wing MA V displayed static stability in all three principal control axes (Pitch, Roll, Yaw), while the rigid MA V was not definitively stable in any axis. All flexible wing control surface configurations resulted in predictable and consistent performance between -10 and + 10 elevon deflection. Reponses declined steadily after :+ or -10 showing dramatic direction changes.

Download or read book An Experimental Investigation on the Micro Air Vehicle written by Shih Kang Huang and published by . This book was released on 2014 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation was conducted to study the flow characteristics of the flow around the flapping wings of a four-wing flapper as well as the lift and thrust coefficient of a four-wing flapper. In the present study, a clap-and-fling type of four-wing flapper was designed and manufactured by using several flexible materials, such as PET film, latex, and aluminized Mylar. Different cross-strut patterns and dimensions of wings were manufactured and tested to optimize the wing designs. In addition to taking the lift and thrust measurements using a highly sensitive force moment sensor unit, a high-resolution Particle Image Velocimetry (PIV) system was employed to achieve detailed flow field measurements to quantify the evolution of the unsteady vortex flow structure around the wings and in the downstream of the flapper. The force measurements were analyzed in correlation with the detailed flow measurements to elucidate the underlying physics to improve our understanding for an optimized flexible wing design and to achieve better performance for flapping wing micro air vehicles. A woofer loudspeaker was employed at the test section where the four-wing flapper was placed to generate sound distances. The effect of different frequencies and amplitudes of sound waves on the aerodynamic performance was investigated. A sensitive force moment sensor unit and PIV system were utilized to measure the lift and thrust and to take detailed flow field measurements to quantify the effect of sound waves on the flow and wing deformation. The force measurements were analyzed in correlation with the detailed flow measurements and qualitative wing deformation data to elucidate underlying the physics in to improve our understanding of the effect of acoustic disturbances on flexible wings and the overall aerodynamic performance of MAVs.

Download or read book Fixed and Flapping Wing Aerodynamics for Micro Air Vehicle Applications written by Thomas J. Mueller and published by AIAA. This book was released on 2001 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Aerodynamic Studies of Micro Air Vehicles written by Helen Louise Reed and published by . This book was released on 2001 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The program at Arizona State University (ASU) consisted of complementary experimental, computational, and flight-test elements that examined the aerodynamics of Micro Aerial Vehicles (MAVs). All these components supported the actual design of our MAV, called MAVRIC (Micro Aerial Vehicle Research Initiative and Competition) and which competed for two years against other university teams. MAVs are characterized by low operating chord Reynolds numbers and thus present challenges in viscous aerodynamics. Our studies focused on the effects on performance of different wing-body-juncture and wing-tip designs. MAV aerodynamics is strongly affected by the wing-tip vortices which extend over a significant amount of span. Blending the wing and fuselage and adding winglets provided a reduction in the extent of these vortices as well as a refocusing of them away from the lifting surface.

Download or read book An Experimental Investigation of Flapping Wing Propulsion for Micro Air Vehicles written by Sean J. Duggan and published by . This book was released on 2000-06-01 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book An Experimental Investigation of Flapping Wing Aerodynamics in Micro Air Vehicles written by Christopher J. Bradshaw and published by . This book was released on 2003-06-01 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Journal of Vibration Testing and System Dynamics written by Jan Awrejcewicz and published by L& H Scientific Publishing. This book was released on 2018-07-01 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vibration Testing and System Dynamics is an interdisciplinary journal serving as the forum for promoting dialogues among engineering practitioners and research scholars. As the platform for facilitating the synergy of system dynamics, testing, design, modeling, and education, the journal publishes high-quality, original articles in the theory and applications of dynamical system testing. The aim of the journal is to stimulate more research interest in and attention for the interaction of theory, design, and application in dynamic testing. Manuscripts reporting novel methodology design for modelling and testing complex dynamical systems with nonlinearity are solicited. Papers on applying modern theory of dynamics to real-world issues in all areas of physical science and description of numerical investigation are equally encouraged. Progress made in the following topics are of interest, but not limited, to the journal: Vibration testing and designDynamical systems and controlTesting instrumentation and controlComplex system dynamics in engineeringDynamic failure and fatigue theoryChemical dynamics and bio-systemsFluid dynamics and combustionPattern dynamicsNetwork dynamicsPlasma physics and plasma dynamicsControl signal synchronization and trackingBio-mechanical systems and devicesStructural and multi-body dynamicsFlow or heat-induced vibrationMass and energy transfer dynamicsWave propagation and testing

Download or read book Flapping Wing Vehicles written by Lung-Jieh Yang and published by CRC Press. This book was released on 2021-09-30 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flapping wing vehicles (FWVs) have unique flight characteristics and the successful flight of such a vehicle depends upon efficient design of the flapping mechanisms while keeping the minimum weight of the structure. Flapping Wing Vehicles: Numerical and Experimental Approach discusses design and kinematic analysis of various flapping wing mechanisms, measurement of flap angle/flapping frequency, and computational fluid dynamic analysis of motion characteristics including manufacturing techniques. The book also includes wind tunnel experiments, high-speed photographic analysis of aerodynamic performance, soap film visualization of 3D down washing, studies on the effect of wing rotation, figure-of-eight motion characteristics, and more. Features Covers all aspects of FWVs needed to design one and understand how and why it flies Explains related engineering practices including flapping mechanism design, kinematic analysis, materials, manufacturing, and aerodynamic performance measures using wind tunnel experiments Includes CFD analysis of 3D wing profile, formation flight of FWVs, and soap film visualization of flapping wings Discusses dynamics and image-based control of a group of ornithopters Explores indigenous PCB design for achieving altitude and attitude control This book is aimed at researchers and graduate students in mechatronics, materials, aerodynamics, robotics, biomimetics, vehicle design and MAV/UAV.

Download or read book Experimental Investigation Into the Aerodynamics of Small Air Vehicles with Thin Flexible Wings written by Timothy Craig Witushynsky and published by . This book was released on 2008 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experimental Characterization Design Analysis and Optimization of Flexible Flapping Wings for Micro Air Vehicles written by Pin Wu and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT:This work has advanced the understanding of flapping flight of flexible wings designed to be used in micro air vehicles. A complete new experimental setup that includes a wing actuation mechanism, a customized digital image correlation system, a control system, a load sensor and a vacuum chamber is realized for this study. The technique of digital image correlation has also been developed so that complicated wing kinematics and deformation can be measured. The flapping wing effectiveness and efficiency have been evaluated in different conditions. The results indicate that passive wing deformation can be utilized to enhance aerodynamic performance, under certain inertial loading mainly dictated by flapping frequency, amplitude, wing compliance and mass distribution. The wing deformation reflects the aeroelastic effect produced by the coupled aerodynamic loading as well as the inertial loading. Critical parameters extracted from the deformation data are used to characterize the structural properties of the wings and correlate with the aerodynamic performance. The correlation shows that for one-degree-of-freedom kinematics, wing deformation can be directly used to predict time averaged thrust. The intrinsic relationship between kinematics and inertial loading enables the design and optimization of wing structure based on the correlation results.

Download or read book Micro Air Vehicle Motion Tracking and Aerodynamic Modeling written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mechanics And Mechanical Engineering Proceedings Of The 2015 International Conference Mme2015 written by Maosen Cao and published by World Scientific. This book was released on 2016-07-14 with total page 1398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings consists of 162 selected papers presented at the 2nd Annual International Conference on Mechanics and Mechanical Engineering (MME2015), which was successfully held in Chengdu, China between December 25-27, 2015.MME2015 is one of the key international conferences in the fields of mechanics, mechanical engineering. It offers a great opportunity to bring together researchers and scholars around the globe to deliver the latest innovative research and the most recent developments in the field of Mechanics and Mechanical Engineering.MME2015 received over 400 submissions from about 600 laboratories, colleges and famous institutes. All the submissions have undergone double blind reviewed to assure the quality, reliability and validity of the results presented. These papers are arranged into 6 main chapters according to their research fields. These are: 1) Applied Mechanics 2) Mechanical Engineering and Manufacturing Technology 3) Material Science and Material Engineering 4) Automation and Control Engineering 5) Electrical Engineering 6) System Modelling and Simulation.This proceedings will be invaluable to academics and professionals interested in Mechanics and Mechanical Engineering.

Download or read book Introduction to the Design of Fixed wing Micro Air Vehicles written by T. J. Mueller and published by Amer Inst of Aeronautics &. This book was released on 2007-01 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: This intriguing book breaks new ground on an emerging subject that has attracted considerable attention: the use of unmanned micro air vehicles (MAVs) to conduct special, limited duration missions. Significant advances in the miniaturization of electronics make it now possible to use vehicles of this type in a detection or surveillance role to carry visual, acoustic, chemical, or biological sensors. Interestingly, many of the advances in MAV technology can be traced directly to annual student competitions, begun in the late 1990s, that use relatively low cost model airplane equipment. The wide variety of configurations entered in these contests and their ongoing success has led to a serious interest in testing the performance of these vehicles for adaptation to practical applications. MAVs present aerodynamic issues unique to their size and the speeds at which they operate. Of particular concern is the aerodynamic efficiency of various fixed wing concepts. Very little information on the performance of low aspect ratio wing planforms existed for this flight regime until MAVs became of interest and the proliferation of fixed wing designs has since expanded. This book presents a brief history of unmanned air vehicles and offers elements of aerodynamics for low aspect ratio wings. Propulsion and the basic concepts for fixed wing MAV design are presented, as is a method for autopilot integration. Three different wing configurations are presented in a series of step-by-step case studies. The goal of the book is to assist both working professionals and students to design, build, and fly MAVs, and do so in a way that will advance the state of the art and lead to the development of even smalleraircraft.

Download or read book Introduction to Aeroelasticity written by Harijono Djojodihardjo and published by Springer Nature. This book was released on 2023-09-03 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook is intended as a core text for courses on aeroelasticity or aero-elasto-mechanics for senior undergraduate/graduate programs in aerospace and mechanical engineering. The book focuses on the basic understanding of the concepts required in learning about aeroelasticity, from observation, reasoning, and understanding fundamental physical principles. Fundamental and simple mathematics will be introduced to describe the features of aeroelastic problems, and to devise simple concurrent physical and mathematical modeling. It will be accompanied by the introduction and understandings of the mechanisms that create the interactions that generate the aeroelastic phenomena considered. The students will also be led to the relation between observed phenomena, assumptions that may have to be adopted to arrive at physical and mathematical modelling, interpreting and verifying the results, and the accompanied limitations, uncertainties and inaccuracies. The students will also be introduced to combine engineering problem solving attitude and determination with simple mechanics problem-solving skills that coexist harmoniously with a useful mechanical intuition.

Download or read book 2023 Asia Pacific International Symposium on Aerospace Technology APISAT 2023 Proceedings written by Song Fu and published by Springer Nature. This book was released on with total page 1975 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The DelFly written by G.C.H.E. de Croon and published by Springer. This book was released on 2015-11-26 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the topics most relevant to autonomously flying flapping wing robots: flapping-wing design, aerodynamics, and artificial intelligence. Readers can explore these topics in the context of the "Delfly", a flapping wing robot designed at Delft University in The Netherlands. How are tiny fruit flies able to lift their weight, avoid obstacles and predators, and find food or shelter? The first step in emulating this is the creation of a micro flapping wing robot that flies by itself. The challenges are considerable: the design and aerodynamics of flapping wings are still active areas of scientific research, whilst artificial intelligence is subject to extreme limitations deriving from the few sensors and minimal processing onboard. This book conveys the essential insights that lie behind success such as the DelFly Micro and the DelFly Explorer. The DelFly Micro, with its 3.07 grams and 10 cm wing span, is still the smallest flapping wing MAV in the world carrying a camera, whilst the DelFly Explorer is the world's first flapping wing MAV that is able to fly completely autonomously in unknown environments. The DelFly project started in 2005 and ever since has served as inspiration, not only to many scientific flapping wing studies, but also the design of flapping wing toys. The combination of introductions to relevant fields, practical insights and scientific experiments from the DelFly project make this book a must-read for all flapping wing enthusiasts, be they students, researchers, or engineers.