Multiobjective Optimization for the Aero-Structural Design of Adaptive Compliant Wing Devices

Abstract

The design of morphing structures must combine conflicting structural requirements and multiple load conditions that are related to the aerodynamic shapes aimed at optimizing aircraft performance. This article proposes a multilevel approach for the design of adaptive compliant wing devices. A set of aerodynamic shapes, and associated their loads, is defined by a shape optimization, coupled with a three-dimensional parametric technique, that can identify only feasible shape changes due to the morphing. A topology and sizing multiobjective optimization drives the Pareto-optimal structural design of the compliant structure, which is able to deform itself to match, once actuated, all of the previously defined aerodynamic shapes. Next two design levels produce a more detailed solution which is extended until the definition of the complete device. A 90 pax, twin prop green regional aircraft is used as an innovative aircraft demonstration platform for the design of the morphing droop nose to be installed on the wing. The results show the structural capabilities of this device in terms of the external shape quality and the strain requirements. This work enables the validation of the design method and prove the functionality of compliant structures when accounting for the aeroelastic effects due to the interaction with the wing-box.

Topology Optimization of Large-Scale 3D Morphing Wing Structures

“…In the reviewed literature, no true 3D model were presented; both Kambayashi et al [9] and De Gaspari [12] presented 2.5D results, where they performed optimization on 2D ribs connected to a 3D wing section. Our results cannot be compared to theirs as they solved different problems and applied external loading to drive their model.…”

“…The thermal expansion coefficient interpolation was the same as for the density approach: (12). An illustration of the two parameterization approaches is seen in Figure 3, where it is seen how the two design fields are realized and how they are combined for the physical material field.…”

“…Zhang et al [11] presented a study of a morphing wing leading edge driven by a compliant mechanism design. De Gaspari et al [12] proposed the design of an adaptive compliant wing through a multilevel optimization approach where, sizing, shape, and topology optimization were adopted. Gomes and Palacios [13] presented a method for a two-step optimization of aerodynamic shape adaptation by a compliant mechanism, through modeling fluid-structure interaction problems combined with density-based topology optimization.…”

Topology Optimization of Large-Scale 3D Morphing Wingstructures

“…Zhang et al [11] presented a study of a morphing wing leading edge driven by a compliant mechanism design. De Gaspari [12] proposed a design of adaptive compliant wing through a multilevel optimization approach where, sizing, shape and topology optimization are adopted. Gomes and Palacios [13] presented a method for a two-step optimization of aerodynamic shape adaptation a compliant mechanism, by modeling fluid-structure interaction problems combining with density-based topology optimization.…”

“…257 [9] and De Gaspari [12] present 2.5D results, where they performed optimization on 2D 258 ribs that is connected to a 3D wing section. Our results cannot compared to theirs as they 263 Furthermore, with the additions of actuator design formulation, it is possible to design a 264 complex 3D mechanisms to achieve desired morphing shape while considering actuation.…”