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Structural and Multidisciplinary Optimization
Article . 1992 . Peer-reviewed
License: Springer TDM
Data sources: Crossref
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An enhanced integrated aerodynamic load/dynamic optimization procedure for helicopter rotor blades

Authors: A. Chattopadhyay; Y. D. Chiu;

An enhanced integrated aerodynamic load/dynamic optimization procedure for helicopter rotor blades

Abstract

An enhanced integrated aerodynamic load/dynamic optimization procedure is developed for minimizing vibratory root shears and moments of a helicopter rotor blade. The optimization problem is formulated with 4/rev inplane shears at the blade root as objective functions. Constraints are imposed on 3/rev radial shear, 3/rev flapping and torsional moments, 4/rev lagging moment, blade natural frequencies, weight, autorotational inertia, centrifugal stress and rotor thrust. The “global criteria approach” is used for formulating the multiobjective optimization. Design variables include spanwise distributions of blade bending stiffnesses, torsional stiffness, nonstructural mass, chord, radius of gyration and blade taper ratio. The programme CAMRAD is coupled with an optimizer, which consists of the programme CONMIN and an approximate analysis. The optimization procedure is applied to an advanced rotor as a reference design. Optimum blade designs, obtained with and without a constraint on the rotor thrust, are presented and are compared to the reference blade. Substantial reductions are obtained in the vibratory root forces and moments. As a byproduct, improvements are also found in some performance parameters which were not considered during the formulation of the optimization problem. The effect of thrust constraint on the values of the vibratory forces and moments is demonstrated by varying the magnitude of the prescribed thrust. A proper choice of the “move limit” parameter, used in the approximate analysis, is shown to have significant effect on the optimum results.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
7
Average
Top 10%
Top 10%
bronze