Open Access
Differential equations of motion for combined flapwise bending, chordwise bending, and torsion of twisted nonuniform rotor blades
John C. Houbolt,George W Brooks +1 more
TLDR
In this article, the differential equations of motion for the lateral and torsional deformations of twisted rotating beams are developed for application to helicopter rotor and propeller blades, and the generality is such that previous theories involving various simplifications are contained as subcases to the theory presented in this paper.Abstract:
The differential equations of motion for the lateral and torsional deformations of twisted rotating beams are developed for application to helicopter rotor and propeller blades. No assumption is made regarding the coincidence of the neutral, elastic, and mass axes, and the generality is such that previous theories involving various simplifications are contained as subcases to the theory presented in this paper. Special attention is given the terms which are not included in previous theories. These terms are largely coupling-type terms associated with the centrifugal forces. Methods of solution of the equations of motion are indicated by selected examples.read more
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Inverse flight dynamics and comprehensive analysis for unsteady maneuver loads prediction
R. Prasad,A. Abhisek +1 more
TL;DR: The inverse flight dynamics with baseline rotor dynamics is able to predict the correct trend of variation of control angle time history, but peak-to-peak magnitude variation is overpredicted.
Journal ArticleDOI
Static aeroelastic twist effects on helicopter rotor-induced velocity
K. S. Nagaraja,G. Alvin Pierce +1 more
Journal ArticleDOI
Suboptimale Regelung der Bewegung eines elastischen Rotorblattes für Hubschrauber im Schnellflug
TL;DR: In Schnellhubschraubern, die Biegebelastung der einzelnen Blatter stark anwachst werden wenigstens die elastische Verformung des Blattes in Schlagrichtung mit berucksichtigt werde as mentioned in this paper.
Proceedings ArticleDOI
Aeroelastic Stability of Horizontal Axis Wind Turbine Blades
TL;DR: In this paper, the aeroelastic stability of wind turbine blades modeled as thin walled composite box beam, utilizing unsteady incompressible aerodynamics, was investigated for multi-megawatt wind turbines.
References
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Book
Theory of elasticity
TL;DR: The theory of the slipline field is used in this article to solve the problem of stable and non-stressed problems in plane strains in a plane-strain scenario.
Simplified Procedures and Charts for the Rapid Estimation of Bending Frequencies of Rotating Beams
TL;DR: In this paper, a Rayleigh energy approach utilizing the bending mode of the nonrotating beam in the determination of the bending frequency of the rotating beam was presented, which is evaluated and is found to give good practical results for helicopter blades.