Abstract
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
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