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Journal articles on the topic 'Active aerodynamics'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Kurec, Krzysztof, Michał Remer, Jakub Broniszewski, Przemysław Bibik, Sylwester Tudruj, and Janusz Piechna. "Advanced Modeling and Simulation of Vehicle Active Aerodynamic Safety." Journal of Advanced Transportation 2019 (February 3, 2019): 1–17. http://dx.doi.org/10.1155/2019/7308590.

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The aim of this study was to extend the safety limits of fast moving cars by the application, in a controlled way, of aerodynamic forces which increase as the square of a car’s velocity and, if left uncontrolled, dramatically reduce car safety. This paper presents the methods, assumptions, and results of numerical and experimental investigations by modeling and simulation of the aerodynamic characteristics and dynamics of a small sports car equipped with movable aerodynamic elements operated by an electronic subsystem for data acquisition and aerodynamics active automatic control.

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Žilinský, Juraj, and Milan Vanc. "Applied Aerodynamics in Building." Advanced Materials Research 855 (December 2013): 164–67. http://dx.doi.org/10.4028/www.scientific.net/amr.855.164.

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Development of new materials, high strength concrete, steels, composites, new construction techniques and procedures put the Development of new materials, high strength concrete, steels, composites, new construction techniques and procedures put the foundations of a new generation of buildings. With the advent of advanced computer technology, using the finite element method engineers and architects plan and construct buildings that are, high, flexible, thin and lightweight. These buildings, however, are burdened by aerodynamic forces, whose source is wind. Just the action of aerodynamic forces

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Jung, Frank. ""All vehicles can benefit from active aerodynamics"." ATZ worldwide 123, no. 4 (March 26, 2021): 22–25. http://dx.doi.org/10.1007/s38311-021-0647-0.

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Althoff, Matthias, Mayuresh J. Patil, and Johannes P. Traugott. "Nonlinear Modeling and Control Design of Active Helicopter Blades." Journal of the American Helicopter Society 57, no. 1 (January 1, 2012): 1–11. http://dx.doi.org/10.4050/jahs.57.012002.

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This paper presents the theoretical basis for the simulation and control of active helicopter blades. The analysis is based on a model that considers the structural dynamics, the aerodynamics, as well as the integrated blade actuation and sensing. The effect of the integral actuation enters the beam model via an active beam cross-sectional analysis. A two-dimensional incompressible, inviscid, quasi-steady aerodynamic model is coupled to the active structural model. For simulation, analysis, and control design, the blade model is discretized in space using a Galerkin approach. The resulting non

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NIE, RUI, JINHAO QIU, HONGLI JI, and DAWEI LI. "AERODYNAMIC CHARACTERISTIC OF THE ACTIVE COMPLIANT TRAILING EDGE CONCEPT." International Journal of Modern Physics: Conference Series 42 (January 2016): 1660173. http://dx.doi.org/10.1142/s2010194516601733.

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This paper introduces a novel Morphing Wing structure known as the Active Compliant Trailing Edge (ACTE). ACTE structures are designed using the concept of “distributed compliance” and wing skins of ACTE are fabricated from high-strength fiberglass composites laminates. Through the relative sliding between upper and lower wing skins which are connected by a linear guide pairs, the wing is able to achieve a large continuous deformation. In order to present an investigation about aerodynamics and noise characteristics of ACTE, a series of 2D airfoil analyses are established. The aerodynamic char

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Czyż, Zbigniew, and Mirosław Wendeker. "Measurements of Aerodynamic Interference of a Hybrid Aircraft with Multirotor Propulsion." Sensors 20, no. 12 (June 13, 2020): 3360. http://dx.doi.org/10.3390/s20123360.

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This article deals with the phenomenon of aerodynamic interference occurring in the innovative hybrid system of multirotor aircraft propulsion. The approach to aerodynamics requires a determination of the impact of active sources of lift and thrust upon the aircraft aerodynamic characteristics. The hybrid propulsion unit, composed of a conventional multirotor source of thrust as well as lift in the form of the main rotor and a pusher, was equipped with an additional propeller drive unit. The tests were conducted in a continuous-flow low speed wind tunnel with an open measuring space, 1.5 m in

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Qin, N., Y. Zhu, and S. T. Shaw. "Numerical study of active shock control for transonic aerodynamics." International Journal of Numerical Methods for Heat & Fluid Flow 14, no. 4 (June 2004): 444–66. http://dx.doi.org/10.1108/09615530410532240.

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Dowell, Earl H., Kenneth C. Hall, and Michael C. Romanowski. "Eigenmode Analysis in Unsteady Aerodynamics: Reduced Order Models." Applied Mechanics Reviews 50, no. 6 (June 1, 1997): 371–86. http://dx.doi.org/10.1115/1.3101718.

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In this article, we review the status of reduced order modeling of unsteady aerodynamic systems. Reduced order modeling is a conceptually novel and computationally efficient technique for computing unsteady flow about isolated airfoils, wings, and turbomachinery cascades. Starting with either a time domain or frequency domain computational fluid dynamics (CFD) analysis of unsteady aerodynamic or aeroacoustic flows, a large, sparse eigenvalue problem is solved using the Lanczos algorithm. Then, using just a few of the resulting eigenmodes, a Reduced Order Model of the unsteady flow is construct

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Bieler, Heribert. "Active flow control concepts and application opportunities." Aircraft Engineering and Aerospace Technology 89, no. 5 (September 4, 2017): 725–29. http://dx.doi.org/10.1108/aeat-01-2017-0015.

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Purpose Aerodynamics drives the aircraft performance and, thus, influences fuel consumption and environmental compatibility. Further, optimization of aerodynamic shapes is an ongoing design activity in industrial offices; this will lead to incremental improvements. More significant step changes in performance are not expected from pure passive shape design. However, active flow control is a key technology, which has the potential to realize a drastic step change in performance. Flow control targets two major goals: low speed performance enhancements mainly for start and landing phase via contr

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Psiaki, Mark L. "Nanosatellite Attitude Stabilization Using Passive Aerodynamics and Active Magnetic Torquing." Journal of Guidance, Control, and Dynamics 27, no. 3 (May 2004): 347–55. http://dx.doi.org/10.2514/1.1993.

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Stoica, Adrian Mihail, Marius Stoia-Djeska, and Gabriela Stroe. "Stability Analysis of an Aeroelastic System with Actuator Saturation." Advanced Materials Research 463-464 (February 2012): 1527–32. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.1527.

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Aeroelastic problems of light weight structures of modern aerospace vehicles are the result of interactions between aerodynamics, structural and inertial forces. The mathematical model of the aeroelastic problem is based on the Lagrange equations of motion for the structural dynamics and on a quasi-steady approach of the generalized unsteady incompressible aerodynamic forces. The oscillations of such aeroelastic system can be suppressed using linear active control techniques. In the case when the control is saturated the stability domain shrinks. The describing function method is used in this

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Party, Petra, Csilla Bartos, Árpád Farkas, Piroska Szabó-Révész, and Rita Ambrus. "Formulation and In Vitro and In Silico Characterization of “Nano-in-Micro” Dry Powder Inhalers Containing Meloxicam." Pharmaceutics 13, no. 2 (February 3, 2021): 211. http://dx.doi.org/10.3390/pharmaceutics13020211.

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Pulmonary delivery has high bioavailability, a large surface area for absorption, and limited drug degradation. Particle engineering is important to develop inhalable formulations to improve the therapeutic effect. In our work, the poorly water-soluble meloxicam (MX) was used as an active ingredient, which could be useful for the treatment of non-small cell lung cancer, cystic fibrosis, and chronic obstructive pulmonary disease. We aimed to produce inhalable “nano-in-micro” dry powder inhalers (DPIs) containing MX and additives (poly-vinyl-alcohol, leucine). We targeted the respiratory zone wi

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Barlas, Thanasis, Eva Jost, Georg Pirrung, Theofanis Tsiantas, Vasilis Riziotis, Sachin T. Navalkar, Thorsten Lutz, and Jan-Willem van Wingerden. "Benchmarking aerodynamic prediction of unsteady rotor aerodynamics of active flaps on wind turbine blades using ranging fidelity tools." Journal of Physics: Conference Series 753 (September 2016): 022027. http://dx.doi.org/10.1088/1742-6596/753/2/022027.

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Pastrikakis, V. A., R. Steijl, and G. N. Barakos. "Effect of active Gurney flaps on overall helicopter flight envelope." Aeronautical Journal 120, no. 1230 (June 7, 2016): 1230–61. http://dx.doi.org/10.1017/aer.2016.57.

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ABSTRACTThis paper presents a study of the W3-Sokol main rotor equipped with Gurney flaps. The effect of the active Gurney is tested at low and high forward flight speeds to draw conclusions about the potential enhancement of the rotorcraft performance for the whole flight envelope. The effect of the flap on the trimming and handling of a full helicopter is also investigated. Fluid and structure dynamics were coupled in all cases, and the rotor was trimmed at different thrust coefficients. The Gurney proved to be efficient at medium to high advance ratios, where the power requirements of the r

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Nakashima, Takuji, Chao Yan, Takashi Moriuchi, Itsuhei Kohri, Hidemi Mutsuda, and Yasuaki Doi. "Active aerodynamics control of simplified vehicle body in a crosswind condition." Journal of Engineering 2020, no. 14 (November 1, 2020): 1005–11. http://dx.doi.org/10.1049/joe.2020.0062.

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Dai, Hu, Haoxiang Luo, and James F. Doyle. "Dynamic pitching of an elastic rectangular wing in hovering motion." Journal of Fluid Mechanics 693 (January 17, 2012): 473–99. http://dx.doi.org/10.1017/jfm.2011.543.

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AbstractIn order to study the role of the passive deformation in the aerodynamics of insect wings, we computationally model the three-dimensional fluid–structure interaction of an elastic rectangular wing at a low aspect ratio during hovering flight. The code couples a viscous incompressible flow solver based on the immersed-boundary method and a nonlinear finite-element solver for thin-walled structures. During a flapping stroke, the wing surface is dominated by non-uniform chordwise deformations. The effects of the wing stiffness, mass ratio, phase angle of active pitching, and Reynolds numb

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V, Somashekar. "A Computational Investigation of Unsteady Aerodynamics of Insect-Inspired Fixed Wing Micro Aerial Vehicle’s 2D Airfoil." Advances in Aerospace Engineering 2014 (June 17, 2014): 1–7. http://dx.doi.org/10.1155/2014/504049.

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A Micro air vehicle (MAV) is defined as class of unmanned air vehicle (UAV) having a linear dimension of less than 15 centimeters and a mass of less than 100 grams with flight speeds of 6 to 12 meters per second. MAVs fall within a Reynolds number (Re) range of 50,000 and 120,000, in which many causes of unsteady aerodynamic effects are not fully understood. The research field of low Reynolds number aerodynamics is currently an active one, with many defence organizations, universities, and corporations working towards a better understanding of the physical processes of this aerodynamic regime.

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Liu, Hao, Sridhar Ravi, Dmitry Kolomenskiy, and Hiroto Tanaka. "Biomechanics and biomimetics in insect-inspired flight systems." Philosophical Transactions of the Royal Society B: Biological Sciences 371, no. 1704 (September 26, 2016): 20150390. http://dx.doi.org/10.1098/rstb.2015.0390.

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Insect- and bird-size drones—micro air vehicles (MAV) that can perform autonomous flight in natural and man-made environments are now an active and well-integrated research area. MAVs normally operate at a low speed in a Reynolds number regime of 10 4 –10 5 or lower, in which most flying animals of insects, birds and bats fly, and encounter unconventional challenges in generating sufficient aerodynamic forces to stay airborne and in controlling flight autonomy to achieve complex manoeuvres. Flying insects that power and control flight by flapping wings are capable of sophisticated aerodynamic

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Ahangarnejad, Arash Hosseinian, Stefano Melzi, and Mehdi Ahmadian. "Integrated Vehicle Dynamics System through Coordinating Active Aerodynamics Control, Active Rear Steering, Torque Vectoring and Hydraulically Interconnected Suspension." International Journal of Automotive Technology 20, no. 5 (August 10, 2019): 903–15. http://dx.doi.org/10.1007/s12239-019-0084-x.

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Dimino, Ignazio, Giovanni Andreutti, Frédéric Moens, Federico Fonte, Rosario Pecora, and Antonio Concilio. "Integrated Design of a Morphing Winglet for Active Load Control and Alleviation of Turboprop Regional Aircraft." Applied Sciences 11, no. 5 (March 9, 2021): 2439. http://dx.doi.org/10.3390/app11052439.

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Aircraft winglets are well-established devices that improve aircraft fuel efficiency by enabling a higher lift over drag ratios and lower induced drag. Retrofitting winglets to existing aircraft also increases aircraft payload/range by the same order of the fuel burn savings, although the additional loads and moments imparted to the wing may impact structural interfaces, adding more weight to the wing. Winglet installation on aircraft wing influences numerous design parameters and requires a proper balance between aerodynamics and weight efficiency. Advanced dynamic aeroelastic analyses of the

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Stuermer, A., J. Yin, and R. Akkermans. "Progress in aerodynamic and aeroacoustic integration of CROR propulsion systems." Aeronautical Journal 118, no. 1208 (October 2014): 1137–58. http://dx.doi.org/10.1017/s0001924000009829.

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Abstract Contra-Rotating Open Rotor (CROR) propulsion systems have seen renewed interest as an economic and environmentally friendly powerplant for future transport aircraft. Installation effects, i.e. the mutual interactions between airframe components and the rotors, have a pronounced impact on the aerodynamic and aeroacoustic performance for this type of engine. In the past five years, DLR’s Institute of Aerodynamics and Flow Technology has performed a number of numerical studies investigating important aspects relating to engine-airframe integration of CROR engines. In this article an over

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Zulkefli, Nur Faraihan, Zulhilmy Sahwee, Nurhayati Mohd Nur, Muhamad Nor Ashraf Mohd Fazil, and Muaz Mohd Shukri. "Lift Augmentation between Passive and Active Vortex Generator." Applied Mechanics and Materials 851 (August 2016): 532–37. http://dx.doi.org/10.4028/www.scientific.net/amm.851.532.

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This study was conducted to investigate the performance of passive and active vortex generator on the wing’s flap. The triangular shape of passive vortex generator (VG) was developed and attached on the wing’s flap leading edge while the plasma actuator performed as active vortex generator. The test was carried out experimentally using subsonic wind tunnel with 300 angles extended flap. Three different types of turbulent flow; with Reynolds number 1.5 x105, 2.0 x105, and 2.6x105 were used to study the aerodynamics forces of airfoil with plasma actuator OFF. All Reynolds number used were below

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Dominy, J., and D. N. Bulman. "An Active Suspension for a Formula One Grand Prix Racing Car." Journal of Dynamic Systems, Measurement, and Control 107, no. 1 (March 1, 1985): 73–79. http://dx.doi.org/10.1115/1.3140710.

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During 1982, Formula 1 racing cars generated very high downforces by the use of “ground effect” aerodynamics. Such cars required very stiff suspensions to maintain a reasonably constant ride height with the result that the slightest bump unsettled the chassis and reduced cornering speeds. A semi-active suspension would have been capable of withstanding the variations in downforce while remaining “soft” to rapid road inputs. This paper proposes such a system and decribes an analysis of its dynamic responses. It demonstates that it is able to maintain a sensibly constant ride height and attitude

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Schreck, Scott J., Michael C. Robinson, M. Maureen Hand, and David A. Simms. "Blade Dynamic Stall Vortex Kinematics for a Horizontal Axis Wind Turbine in Yawed Conditions*." Journal of Solar Energy Engineering 123, no. 4 (June 1, 2001): 272–81. http://dx.doi.org/10.1115/1.1408307.

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Horizontal axis wind turbines routinely suffer significant time varying aerodynamic loads that adversely impact structures, mechanical components, and power production. As lighter and more flexible wind turbines are designed to reduce overall cost of energy, greater accuracy and reliability will become even more crucial in future aerodynamics models. However, to render calculations tractable, current modeling approaches admit various approximations that can degrade model predictive accuracy. To help understand the impact of these modeling approximations and improve future models, the current e

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Pak, Chan-Gi, Peretz P. Friedmann, and Eli Livne. "Digital Adaptive Flutter Suppression and Simulation Using Approximate Transonic Aerodynamics." Journal of Vibration and Control 1, no. 4 (October 1995): 363–88. http://dx.doi.org/10.1177/107754639500100401.

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A digital adaptive controller, using a trailing edge control surface, is introduced for the active flutter suppression of wings undergoing time varying flight conditions. The aeroservoelastic system is modeled in the time domain by a deterministic Auto Regressive Moving Average (ARMA) model together with a parameter estimator. Linear quadratic controller gains at each time step are obtained using an iterative Riccati solver. Aeroservoelastic transient response is obtained using Roger's approximation, state transition matrices, and an iterative time marching algorithm. Simulations of system per

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Dickinson, Michael H., and Florian T. Muijres. "The aerodynamics and control of free flight manoeuvres in Drosophila." Philosophical Transactions of the Royal Society B: Biological Sciences 371, no. 1704 (September 26, 2016): 20150388. http://dx.doi.org/10.1098/rstb.2015.0388.

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A firm understanding of how fruit flies hover has emerged over the past two decades, and recent work has focused on the aerodynamic, biomechanical and neurobiological mechanisms that enable them to manoeuvre and resist perturbations. In this review, we describe how flies manipulate wing movement to control their body motion during active manoeuvres, and how these actions are regulated by sensory feedback. We also discuss how the application of control theory is providing new insight into the logic and structure of the circuitry that underlies flight stability. This article is part of the theme

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Tesař, Václav. "Aerodynamics of Monolithic Matrices for Supporting Solid Reactant or Catalyst." Energies 12, no. 17 (September 3, 2019): 3398. http://dx.doi.org/10.3390/en12173398.

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Heterogeneous solid/fluid chemical reactions—as well as reactions dependent on solid catalysts—require spreading the active solid substance on the largest accessible area. The solution is a thin layer covering as much as possible convoluted surface of an inert support. This is nowadays the internal surface of narrow parallel passages. The supporting body is usually ceramic, its passages now mostly of square cross section. Reliable detailed knowledge of pressure drop across the set of passages has to be available, especially for flow control based on fluid property changes (e.g., with temperatu

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Tang, Peng, Fei Wang, and Yuehong Dai. "Controller Design for Different Electric Tail Rotor Operating Modes in Helicopters." International Journal of Pattern Recognition and Artificial Intelligence 33, no. 08 (June 25, 2019): 1959022. http://dx.doi.org/10.1142/s0218001419590225.

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The nonlinear aerodynamics and new kinds of operation associated with helicopter electric tail rotors (ETRs) make accurate speed tracking control under complex flight conditions a key challenge confronting designers. In this paper, we present an electric propulsion system for tail rotors that uses a high-power-density permanent magnet motor. The management of aerodynamic disturbance rejection and accurate speed control are aspects of ETR design that require particularly close attention. To this end, we have developed a speed controller that is based on an active disturbance rejection control (

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Cesnik, C. E. S., D. G. Opoku, F. Nitzsche, and T. Cheng. "Active twist rotor blade modelling using particle-wake aerodynamics and geometrically exact beam structural dynamics." Journal of Fluids and Structures 19, no. 5 (June 2004): 651–68. http://dx.doi.org/10.1016/j.jfluidstructs.2004.01.007.

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Bushnell, D. M. "Aircraft drag reduction—a review." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 217, no. 1 (January 1, 2003): 1–18. http://dx.doi.org/10.1243/095441003763031789.

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The paper summarizes the state of the art in aeronautical drag reduction across the speed range for the “conventional” drag components of viscous drag, drag due to lift and wave drag. It also describes several emerging drag-reduction approaches that are either active or reactive/interactive and the drag reduction potentially available from synergistic combinations of advanced configuration aerodynamics, viscous drag-reduction approaches, revolutionary structural concepts and propulsion integration.

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Ristroph, Leif, Gunnar Ristroph, Svetlana Morozova, Attila J. Bergou, Song Chang, John Guckenheimer, Z. Jane Wang, and Itai Cohen. "Active and passive stabilization of body pitch in insect flight." Journal of The Royal Society Interface 10, no. 85 (August 6, 2013): 20130237. http://dx.doi.org/10.1098/rsif.2013.0237.

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Flying insects have evolved sophisticated sensory–motor systems, and here we argue that such systems are used to keep upright against intrinsic flight instabilities. We describe a theory that predicts the instability growth rate in body pitch from flapping-wing aerodynamics and reveals two ways of achieving balanced flight: active control with sufficiently rapid reactions and passive stabilization with high body drag. By glueing magnets to fruit flies and perturbing their flight using magnetic impulses, we show that these insects employ active control that is indeed fast relative to the instab

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Lehmkuhl, Oriol, Adrián Lozano-Durán, and Ivette Rodriguez. "Active flow control for external aerodynamics: from micro air vehicles to a full aircraft in stall." Journal of Physics: Conference Series 1522 (April 2020): 012017. http://dx.doi.org/10.1088/1742-6596/1522/1/012017.

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Yang, Yang, Chun Li, Wanfu Zhang, Xueyan Guo, and Quanyong Yuan. "Investigation on aerodynamics and active flow control of a vertical axis wind turbine with flapped airfoil." Journal of Mechanical Science and Technology 31, no. 4 (April 2017): 1645–55. http://dx.doi.org/10.1007/s12206-017-0312-0.

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Mattaboni, M., P. Masarati, and P. Mantegazza. "Multibody simulation of a generalized predictive controller for tiltrotor active aeroelastic control." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 226, no. 2 (December 7, 2011): 197–216. http://dx.doi.org/10.1177/0954410011406203.

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A generalized predictive control has been developed for the control of the aeroelasticity and structural dynamics of a tiltrotor. Adaptivity is the key feature of the proposed technique. It gives the controller the capability to autonomously follow the variations of the system. A comprehensive simulation system has been adopted to design and test the adaptive regulator under realistic conditions. The aeroservoelastic tiltrotor has been modelled using a multibody approach, considering the structural dynamics, the aerodynamics, the blade pitch control system kinematics, and actuator and sensor d

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Grosche, F. R., and G. E. A. Meier. "Research at DLR Göttingen on bluff body aerodynamics, drag reduction by wake ventilation and active flow control." Journal of Wind Engineering and Industrial Aerodynamics 89, no. 14-15 (December 2001): 1201–18. http://dx.doi.org/10.1016/s0167-6105(01)00161-1.

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Jorge, Ahmed, Christina Dastolfo-Hromack, Witold J. Lipski, Ian H. Kratter, Libby J. Smith, Jackie L. Gartner-Schmidt, and R. Mark Richardson. "Anterior Sensorimotor Subthalamic Nucleus Stimulation Is Associated With Improved Voice Function." Neurosurgery 87, no. 4 (March 21, 2020): 788–95. http://dx.doi.org/10.1093/neuros/nyaa024.

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Abstract Background Despite the impact of Parkinson disease (PD) on speech communication, there is no consensus regarding the effect of lead location on voice-related outcomes in subthalamic nucleus (STN) deep brain stimulation (DBS). Objective To determine the relationship of stimulation location to changes in cepstral analyses of voice following STN DBS. Methods Speech pathology evaluations were obtained from 14 PD subjects, before and after STN DBS, including audio-perceptual voice ratings (overall severity, loudness, hoarseness changes), measured indices of dysphonia (cepstral peak promine

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Rozov, Vladyslav, Andreas Volmering, Andreas Hermanutz, Mirko Hornung, and Christian Breitsamter. "CFD-Based Aeroelastic Sensitivity Study of a Low-Speed Flutter Demonstrator." Aerospace 6, no. 3 (March 6, 2019): 30. http://dx.doi.org/10.3390/aerospace6030030.

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The goal of developing aircraft that are greener, safer and cheaper can only be maintained through significant innovations in aircraft design. An integrated multidisciplinary design approach can lead to an increase in the performance of future derivative aircraft. Advanced aerodynamics and structural design technologies can be achieved by both passive and active suppression of aeroelastic instabilities. To demonstrate the potential of this approach, the EU-funded project Flutter Free Flight Envelope Expansion for Economical Performance Improvement is developing an unmanned aerial vehicle with

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Haan, Fred L. Jr, Partha P. Sarkar, and Nicholas J. Spencer-Berger. "Development of an active gust generation mechanism on a wind tunnel for wind engineering and industrial aerodynamics applications." Wind and Structures 9, no. 5 (October 25, 2006): 369–86. http://dx.doi.org/10.12989/was.2006.9.5.369.

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Karpuk, Stanislav, Snorri Gudmundsson, and Vladimir Golubev. "Feasibility Study of a Multi-Purpose Aircraft Concept with a Leading-Edge Embedded Cross-Flow Fan." Unmanned Systems 08, no. 01 (January 2020): 21–32. http://dx.doi.org/10.1142/s2301385020500028.

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The research presented focuses on investigating the use of Cross-Flow Fan (CFF) as a high-lift device for a Short Take-off and Landing (STOL) aircraft. The wing-embedded fan performance analysis is mostly addressed from an aerodynamic perspective and focuses on using such Active Flow Control (AFC) technology in the conceptual aircraft design process. In particular, the design trade study of an aircraft featuring the fan as a high-lift device applied to a conceptual design of a medium-range multi-purpose aircraft is performed. A sensitivity analysis is employed to investigate the impact of the

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Kalarikovilagam Srinivasan and Bertram. "Preliminary Design and System Considerations for an Active Hybrid Laminar Flow Control System." Aerospace 6, no. 10 (October 1, 2019): 109. http://dx.doi.org/10.3390/aerospace6100109.

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Hybrid laminar flow control or HLFC design is a complex and multi-disciplinary process, which demands a thorough understanding of all aspects from a global systems viewpoint. The objective of the paper is to present a preliminary design of important components of an HLFC system that helps in quick assessment of conceptual system architectures. This is important to evaluate feasibility, system performance, and overall aircraft benefits at early stages of system development. This paper also discusses the various important system requirements and issues concerning the design of active HLFC system

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Richard, Robert E., John A. Rule, and Robert L. Clark. "Genetic Spatial Optimization of Active Elements on an Aeroelastic Delta Wing." Journal of Vibration and Acoustics 123, no. 4 (May 1, 2001): 466–71. http://dx.doi.org/10.1115/1.1389458.

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This work outlines a cohesive approach for the design and implementation of a genetically optimized, active aeroelastic delta wing. Emphasis was placed on computational efficiency of model development and efficient means for optimizing sensor and actuator geometries. Reduced-order models of potential-flow aerodynamics were developed for facilitation of analysis and design of the aeroelastic system in the early design phase. Using these methods, models capturing “95% of the physics with 8% of the modeling effort” can be realized to evaluate various active and passive design considerations. The

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Aho, Jacob P., Andrew D. Buckspan, Fiona M. Dunne, and Lucy Y. Pao. "Controlling Wind Energy for Utility Grid Reliability." Mechanical Engineering 135, no. 09 (September 1, 2013): S4—S12. http://dx.doi.org/10.1115/1.2013-sep-4.

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This article provides an overview of utility grid operation by introducing the fundamental behavior of the electrical system, explaining the importance of maintaining grid reliability through balancing generation and load, and describing the methods of providing ancillary services using conventional utilities. This article also introduces the basic structural components of wind turbines, explains the traditional control systems for capturing maximum power, and highlights control methods developed in industry and academia to provide active power ancillary services with wind energy. As the penet

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H. Suffer, Kadhim, Yassr Y. Kahtan, and Zuradzman M. Razlan. "Aerodynamics and Modal Analysis for the Combined Vane type Vertical Axis Wind Turbine." International Journal of Engineering & Technology 7, no. 4.38 (December 3, 2018): 1395. http://dx.doi.org/10.14419/ijet.v7i4.38.27883.

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The present global energy economy suggests the use of renewable sources such as solar, wind, and biomass to produce the required power. The vertical axis wind turbine is one of wind power applications. Usually, when the vertical axis wind turbine blades are designed from the airfoil, the starting torque problem begins. The main objective of this research is to numerically simulate the combination of movable vanes of a flat plate with the airfoil in a single blade configuration to solve the starting torque problem. CFD analysis in ANSYS-FLUENT and structural analysis in ANSYS of combined blade

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Lin, Min. "Study of Badminton Net Shot Technology Based on Dynamics." Advanced Materials Research 791-793 (September 2013): 1431–35. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.1431.

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In the sport of badminton, net shot is one of the extremely important technologies. With the continuous development and innovation of badminton sport, net technology has been paid more and more attention to. In addition, in many badminton games, it has become an important technical means to change active to passive by taking effective use of net shot changes. Firstly, this paper elaborates the division of badminton net technology area and technology selection. And then, based on this, combined with the principle of aerodynamics, this paper makes an analysis on the dynamics of badminton net tec

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Piao, Minnan, Youan Zhang, Mingwei Sun, Zhihong Yang, Zenghui Wang, and Zengqiang Chen. "Adaptive aeroservoelastic mode stabilization of flexible airbreathing hypersonic vehicle." Journal of Vibration and Control 25, no. 15 (May 20, 2019): 2124–42. http://dx.doi.org/10.1177/1077546319849775.

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The statically unstable airbreathing hypersonic vehicle requires a high-bandwidth controller to control the instability, which results in intricate interactions among the aerodynamics, the low-frequency structural modes, and the flight control system. Especially, the structural frequencies are uncertain and time-varying, which further raises the difficulty of controller design. In this paper, two adaptive aeroservoelastic mode stabilization methods are proposed. First, the condition of phase stabilization is given under the linear active disturbance rejection control framework to realize the s

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UEDA, Tetsuhiko, and Kenichi SAITOH. "NUMERICAL SIMULATION FOR RANDOM AEROELASTIC RESPONSES USING INVERSE FOURIER TRANSFORM." Aviation 20, no. 3 (September 29, 2016): 103–9. http://dx.doi.org/10.3846/16487788.2016.1227535.

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This paper reports a new simulation technique for an aeroelastic system which responds to random external forces. Since the aeroelastic system including the effects of unsteady aerodynamics is ordinarily described in the frequency domain, the Inverse Discrete Fourier Transform (IDFT) can be utilized to simulate its random response. The response caused by the external random noise is calculated through a transfer function first in the frequency domain and then converted to the time domain. The objective of the present study is to provide mathematical time history data for evaluating the various

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Mokina, N. A., V. Yu Zeilert, N. I. Saraeva, G. M. Sakharova, and N. S. Antonov. "Prevalence and particular features of tobacco smoking among adolescents in Chapaevsk, Samara region." PULMONOLOGIYA, no. 6 (December 28, 2007): 58–62. http://dx.doi.org/10.18093/0869-0189-2007-0-6-58-62.

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Under the epidemic rising of tobacco consumption among working-aged people worldwide, there is little Russian detailed data on prevalence and particularities of active and passive tobacco smoking among adolescents. The present 4-stage study involved schoolchildren and students of trade schools (13 to 18 years of age) at Chapaevsk, which is a large industry center of Samara region. The prevalence of tobacco smoking among these adolescents was as high as 28 %. The average age of starting smoking was 14.7 ± 0.4 yrs. A significant effect of tobacco smoking on airway aerodynamics and low motivation

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Löffler, Stephan, Carola Ebert, and Julien Weiss. "Fluidic-Oscillator-Based Pulsed Jet Actuators for Flow Separation Control." Fluids 6, no. 4 (April 20, 2021): 166. http://dx.doi.org/10.3390/fluids6040166.

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The control of flow separation on aerodynamic surfaces remains a fundamental goal for future air transportation. On airplane wings and control surfaces, the effects of flow separation include decreased lift, increased drag, and enhanced flow unsteadiness and noise, all of which are detrimental to flight performance, fuel consumption, and environmental emissions. Many types of actuators have been designed in the past to counter the negative effects of flow separation, from passive vortex generators to active methods like synthetic jets, plasma actuators, or sweeping jets. At the Chair of Aerody

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ALDRIDGE, H. D. J. N. "Body Accelerations During the Wingbeat in Six Bat Species: The Function of the Upstroke in Thrust Generation." Journal of Experimental Biology 130, no. 1 (July 1, 1987): 275–93. http://dx.doi.org/10.1242/jeb.130.1.275.

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The kinematics and aerodynamics of Rhinolophus ferrumequinum, R. hipposideros, Myotis nattereri, M. mystacinus, Plecotus auritus and Eptesicus serotinus in horizontal flight at various flight speeds are described. Three kinematic patterns can be recognized. At low speeds M. nattereri, M. mystacinus and P. auritus use a ‘tip-reversal’ upstroke in which thrust is generated during the backward ‘flick’ of the chiropatagium. R. hipposideros also uses this kinematic pattern, but does not appear to generate thrust during the upstroke. Both R. ferrumequinum flying at 3.12 m s−1 and E. serotinus flying

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Jayaraman, Balaji, Siddharth Thakur, and Wei Shyy. "Modeling of Fluid Dynamics and Heat Transfer Induced by Dielectric Barrier Plasma Actuator." Journal of Heat Transfer 129, no. 4 (January 2, 2007): 517–25. http://dx.doi.org/10.1115/1.2709659.

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Glow discharge at atmospheric pressure using a dielectric barrier discharge can induce fluid flow, and can be used for active control of aerodynamics and heat transfer. In the present work, a modeling framework is presented to study the evolution and interaction of such athermal nonequilibrium plasma discharges in conjunction with low Mach number fluid dynamics and heat transfer. The model is self-consistent, coupling the first-principles-based discharge dynamics with the fluid dynamics and heat transfer equations. Under atmospheric pressure, the discharge can be simulated using a plasma–fluid

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