The Experts below are selected from a list of 12441 Experts worldwide ranked by ideXlab platform

Paolo Ermanni - One of the best experts on this subject based on the ideXlab platform.

Giulio Molinari - One of the best experts on this subject based on the ideXlab platform.

Douglas F Hunsaker - One of the best experts on this subject based on the ideXlab platform.

  • Minimising induced drag with weight Distribution, Lift Distribution, wingspan, and wing-structure weight
    The Aeronautical Journal, 2020
    Co-Authors: Warren F. Phillips, Douglas F Hunsaker, Jeffrey D. Taylor
    Abstract:

    ABSTRACTBecause the wing-structure weight required to support the critical wing section bending moments is a function of wingspan, net weight, weight Distribution, and Lift Distribution, there exists an optimum wingspan and wing-structure weight for any fixed net weight, weight Distribution, and Lift Distribution, which minimises the induced drag in steady level flight. Analytic solutions for the optimum wingspan and wing-structure weight are presented for rectangular wings with four different sets of design constraints. These design constraints are fixed Lift Distribution and net weight combined with 1) fixed maximum stress and wing loading, 2) fixed maximum deflection and wing loading, 3) fixed maximum stress and stall speed, and 4) fixed maximum deflection and stall speed. For each of these analytic solutions, the optimum wing-structure weight is found to depend only on the net weight, independent of the arbitrary fixed Lift Distribution. Analytic solutions for optimum weight and Lift Distributions are also presented for the same four sets of design constraints. Depending on the design constraints, the optimum Lift Distribution can differ significantly from the elliptic Lift Distribution. Solutions for two example wing designs are presented, which demonstrate how the induced drag varies with Lift Distribution, wingspan, and wing-structure weight in the design space near the optimum solution. Although the analytic solutions presented here are restricted to rectangular wings, these solutions provide excellent test cases for verifying numerical algorithms used for more general multidisciplinary analysis and optimisation.

  • Analytic and computational analysis of wing twist to minimize induced drag during roll
    Proceedings of the Institution of Mechanical Engineers Part G: Journal of Aerospace Engineering, 2019
    Co-Authors: Douglas F Hunsaker, Zachary S. Montgomery, James J. Joo
    Abstract:

    Geometric and/or aerodynamic wing twist can be used to produce a Lift Distribution that results in a rolling moment. A decomposed Fourier-series solution to Prandtl’s Lifting-line theory is used to...

  • minimizing induced drag with Lift Distribution and wingspan
    Journal of Aircraft, 2019
    Co-Authors: Warren F. Phillips, Douglas F Hunsaker
    Abstract:

    Minimum induced drag for fixed gross weight and wingspan is obtained from the elliptic Lift Distribution. However, minimum induced drag for steady level flight is not obtained by imposing the const...

Warren F. Phillips - One of the best experts on this subject based on the ideXlab platform.

  • Minimising induced drag with weight Distribution, Lift Distribution, wingspan, and wing-structure weight
    The Aeronautical Journal, 2020
    Co-Authors: Warren F. Phillips, Douglas F Hunsaker, Jeffrey D. Taylor
    Abstract:

    ABSTRACTBecause the wing-structure weight required to support the critical wing section bending moments is a function of wingspan, net weight, weight Distribution, and Lift Distribution, there exists an optimum wingspan and wing-structure weight for any fixed net weight, weight Distribution, and Lift Distribution, which minimises the induced drag in steady level flight. Analytic solutions for the optimum wingspan and wing-structure weight are presented for rectangular wings with four different sets of design constraints. These design constraints are fixed Lift Distribution and net weight combined with 1) fixed maximum stress and wing loading, 2) fixed maximum deflection and wing loading, 3) fixed maximum stress and stall speed, and 4) fixed maximum deflection and stall speed. For each of these analytic solutions, the optimum wing-structure weight is found to depend only on the net weight, independent of the arbitrary fixed Lift Distribution. Analytic solutions for optimum weight and Lift Distributions are also presented for the same four sets of design constraints. Depending on the design constraints, the optimum Lift Distribution can differ significantly from the elliptic Lift Distribution. Solutions for two example wing designs are presented, which demonstrate how the induced drag varies with Lift Distribution, wingspan, and wing-structure weight in the design space near the optimum solution. Although the analytic solutions presented here are restricted to rectangular wings, these solutions provide excellent test cases for verifying numerical algorithms used for more general multidisciplinary analysis and optimisation.

  • minimizing induced drag with Lift Distribution and wingspan
    Journal of Aircraft, 2019
    Co-Authors: Warren F. Phillips, Douglas F Hunsaker
    Abstract:

    Minimum induced drag for fixed gross weight and wingspan is obtained from the elliptic Lift Distribution. However, minimum induced drag for steady level flight is not obtained by imposing the const...

  • Predicting maximum Lift coefficient for twisted wings using Lifting-line theory
    Journal of Aircraft, 2007
    Co-Authors: Warren F. Phillips, Nicholas Alley
    Abstract:

    A method is presented that allows one to predict the maximum Lift coefficient for a wing from knowledge of wing geometry and maximum airfoil section Lift coefficient. The method applies to wings of arbitrary planform and includes the effects of twist and sweep. In addition to predicting the section Lift Distribution for a wing of known planform with a known twist Distribution, the method can be used to predict the twist Distribution, which will produce any desired section Lift Distribution along the span of an unswept wing of any given planform. The method is shown to predict the twist Distribution required to minimize induced drag and is also used to predict the twist Distribution that maximizes the wing Lift coefficient, while keeping the total amount of required twist at a practical level.

Andres F. Arrieta - One of the best experts on this subject based on the ideXlab platform.