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

Research output: Contribution to journalArticle

6 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)75-84
Number of pages10
JournalStructural Optimization
Volume4
Issue number2
DOIs
StatePublished - Jun 1992

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Aerodynamic loads
Helicopter rotors
Dynamic Optimization
Helicopter
Blade
Aerodynamics
Rotor
Turbomachine blades
Rotors
Moment
Stiffness
Roots
Bending (deformation)
Multiobjective optimization
Byproducts
Natural frequencies
Optimization Problem
Chord or secant line
Natural Frequency
Multi-objective Optimization

ASJC Scopus subject areas

  • Civil and Structural Engineering

Cite this

An enhanced integrated aerodynamic load/dynamic optimization procedure for helicopter rotor blades. / Chattopadhyay, Aditi; Chiu, Y. D.

In: Structural Optimization, Vol. 4, No. 2, 06.1992, p. 75-84.

Research output: Contribution to journalArticle

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