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Flutter

About: Flutter is a research topic. Over the lifetime, 10344 publications have been published within this topic receiving 137120 citations.


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Journal ArticleDOI
TL;DR: In this paper, the authors investigated the concept of piezoaeroelasticity for energy harvesting and investigated the effect of piezoelectric power generation on the linear flutter speed.
Abstract: This paper investigates the concept of piezoaeroelasticity for energy harvesting. The focus is placed on mathematical modeling and experimental validations of the problem of generating electricity at the flutter boundary of a piezoaeroelastic airfoil. An electrical power output of 10.7 mW is delivered to a 100 kΩ load at the linear flutter speed of 9.30 m/s (which is 5.1% larger than the short-circuit flutter speed). The effect of piezoelectric power generation on the linear flutter speed is also discussed and a useful consequence of having nonlinearities in the system is addressed.

356 citations

Journal ArticleDOI
TL;DR: In this paper, the difference between a true damping, or rate-of-decay, solution of the flutter equation and the structural-damping type of solution is highlighted.
Abstract: The difference between a true damping, or rate-of-decay, solution of the flutter equation and the structural-damping-type of solution is highlighted. True damping solutions are possible if unsteady aerodynamics can be expressed in terms of the complex variable p. If the aerodynamics are given at discrete values of the reduced frequency fc, an approximate determination of the true damping is possible by assuming that the aerodynamic forces for harmonic motion are a good approximation for the cases of slowly increasing or decreasing amplitude. A determinant iteration method for obtaining the solution is presented. Results obtained by different methods of solving the flutter equation are compared.

353 citations

01 Jan 1935
TL;DR: In this paper, the Kutta condition was used to analyze the aerodynamic forces on an oscillating airfoil or an air-foil-aileron combination of three independent degrees of freedom.
Abstract: The aerodynamic forces on an oscillating airfoil or airfoil-aileron combination of three independent degrees of freedom were determined. The problem resolves itself into the solution of certain definite integrals, which were identified as Bessel functions of the first and second kind, and of zero and first order. The theory, based on potential flow and the Kutta condition, is fundamentally equivalent to the conventional wing section theory relating to the steady case. The air forces being known, the mechanism of aerodynamic instability was analyzed. An exact solution, involving potential flow and the adoption of the Kutta condition, was derived. The solution is of a simple form and is expressed by means of an auxiliary parameter k. The flutter velocity, treated as the unknown quantity, was determined as a function of a certain ratio of the frequencies in the separate degrees of freedom for any magnitudes and combinations of the airfoil-aileron parameters.

351 citations

Journal ArticleDOI
TL;DR: Closely spaced sites around the tricuspid annulus are activated sequentially, and are all within the flutter circuit according to entrainment criteria, demonstrating that the trICuspidannulus constitutes a continuous anterior barrier constraining the reentrant wave front of human counterclockwise atrial flutter.
Abstract: Background The importance of anatomic barriers in the atrial flutter reentry circuit has been well demonstrated in canine models. It has been shown previously that the crista terminalis and its continuation as the eustachian ridge form a posterior barrier. In this study we tested the hypothesis that the tricuspid annulus forms the continuous anterior barrier to the flutter circuit. Methods and Results Thirteen patients with typical atrial flutter were studied. A 20-pole halo catheter was situated around the tricuspid annulus. A mapping catheter was used for activation and entrainment mapping from seven sequential sites around the tricuspid annulus and from three additional sites including the tip of the right atrial appendage, at the fossa ovalis, and in the distal coronary sinus. Sites were considered to be within the circuit when the postpacing interval minus the flutter cycle length and the stimulus time minus the activation time were ≤10 ms; sites were considered to be outside the circuit when these i...

337 citations

Journal ArticleDOI
TL;DR: The coupled interaction between a fluttering flexible flag and a rigid plate is studied and three distinct contact modes are found: single, double and chaotic.
Abstract: The harvesting of electrical energy from renewable sources remains an ongoing scientific focus. Here, the authors report a triboelectric generator that is capable of harnessing energy from the wind via a flutter motion, with the output of the device dependent on the precise motion caused by the wind.

330 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023330
2022609
2021329
2020346
2019403
2018426