Abstract
Aeroelastic optimization has become an indispensable component in the evaluation of divergence and flutter characteristics for plated/shell structures. The present paper intends to review the fundamental trends and dominant approaches in the optimal design of engineering constructions. A special attention is focused on the formulation of objective functions/functional and the definition of physical (material) variables, particularly in view of composite materials understood in the broader sense as not only multilayered laminates but also as sandwich structures, nanocomposites, functionally graded materials, and materials with piezoelectric actuators/sensors. Moreover, various original aspects of optimization problems of composite structures are demonstrated, discussed, and reviewed in depth.
Highlights
The concept of the flutter can be described as an instability associated with self-sustained and self-excited vibration which is a combination of elastic, inertial, and aerodynamic forces where the structure and the flow around it interact with each other
The flutter problem usually starts from small mechanical or aerodynamic disturbance above a critical flow velocity, gives large vibration amplitudes and damages in a short period of time. This phenomenon is a significant problem encountered in the design of aircraft structures [1,2] or turbine blades in the turbomachines (Srinivasan [3])
The fundamental aim of the present paper is to review the existing literature on optimization of constructions subjected to flutter constraints
Summary
The concept of the flutter can be described as an instability associated with self-sustained and self-excited vibration which is a combination of elastic, inertial, and aerodynamic forces where the structure and the flow around it interact with each other. The flutter problem usually starts from small mechanical or aerodynamic disturbance above a critical flow velocity, gives large vibration amplitudes and damages in a short period of time. This phenomenon is a significant problem encountered in the design of aircraft structures [1,2] or turbine blades in the turbomachines (Srinivasan [3]). The current aerospace industry demands innovative designs and materials that offer weight savings, as well as faster and more cost and energy efficient structures. In the flutter analysis the attention is mainly focused on the discussion of different problems that can affect the structural behavior, i.e., the aerodynamic theories, the form of boundary conditions, the structural geometry (the analysis deals mainly with 2D structures), the material properties and the effects of aerothermoelastic coupling. A special attention is focused on the proper choice of material properties since they have an important effect on flutter behavior of turbine blades or aircraft wings
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