An efficient multidisciplinary design optimization methodology is applied in the design of a rotor blade to meet minimum weight, minimum vibration, and maximum material strength requirements. The design study is a high-aspect-ratio articulated flexible blade with a thin-walled multicell cross section at high tip Mach numbers. The rotor blade analysis consists of two subsets to increase efficiency in numerical methods used in each discipline. The first subset is an elastic analysis using an idealized model by chordwise segments and spanwise elements, which can provide efficient material reassignment for minimum weight design. The second subset is a dynamic analysis for optimal natural frequency placement and vibratory vertical hub shear reduction. A high-order finite element from the gradient adaptive transfinite element family formulated by the second author is used to reduce computational requirements and to improve results without increasing the number of elements. The optimization procedure is decomposed into two levels for efficient handling of the design variables and objective functions and their correlation. In level 1, the goal is the design for the minimum weight and maximum material strength simultaneously using the multiobjective optimization technique. In level 2, the goal is the design for the minimum vibratory vertical hub shear load using the modal shaping technique. The numerical results show the efficiency of the analytical methods, the usefulness of the multilevel and multiobjective function optimization, and the effects of tuning masses and their locations on the hub shear reduction.
Elastic-dynamic rotor blade design with multiobjective optimization
Mehrziel-Optimierungsverfahren für den elastodynamischen Entwurf eines Rotorblattes
AIAA Journal ; 39 , 9 ; 1652-1661
2001
10 Seiten, 11 Bilder, 6 Tabellen, 31 Quellen
Article (Journal)
English
dynamisches Verhalten , elastische Bruchmechanik , Finite-Elemente-Methode , Flügelblatt , Frequenzverstimmung , Gewichtsminimierung , Hubschrauber , mathematisches Modell , mechanische Festigkeit , Modalanalyse , Nabe , Optimierungssimulation , Rotor (Drehflügel) , Scherbeanspruchung , Vibrationsdämpfung , Wabenstruktur , Zielsystem
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