A traditional aircraft is optimized for only one or two flight conditions, not for the entire flight envelope. In contrast, the wings of a bird can be reshaped to provide optimal performance at all...

Morphing aircraft based on smart materials and structures: A state-of-the-art review:

Zero Poisson’s ratio cellular structure for two-dimensional morphing applications

The scope of this work is to provide a critical review on the expectations about the morphing wing technology against the current open issues and showstoppers.In synergy to other emerging and promi...

Morphing wings review: aims, challenges, and current open issues of a technology:

This paper describes a new concept of an active honeycomb structure for morphing wingtip applications based on tubular inflatable systems and an auxetic cellular structure. A work-energy model to predict the output honeycomb displacement versus input pressure is developed together with a finite element formulation, and the results are compared with the data obtained from a small-scale example of an active honeycomb. An analysis of the hysteresis associated with multiple cyclic loading is also provided, and design considerations for a larger-scale wingtip demonstrator are made.

https://iopscience.iop.org/article/10.1088/0964-1726/23/12/125023/pdf

Active inflatable auxetic honeycomb structural concept for morphing wingtips

Topology optimization of compliant adaptive wing leading edge with composite materials

In-plane corrugated cosine honeycomb for 1D morphing skin and its application on variable camber wing

Topology optimization of support structure of telescope skin based on bit-matrix representation NSGA-II

Energy harvesting properties of a flapping foil with blow aspirators: A numerical investigation

The utility model discloses a wing assembled with a variant winglet. The wing comprises a main wing rib (1), a main wing frame (15), a motor mounting bracket (2), a rotating type ultrasonic motor (3), a second rotating type ultrasonic motor (14), a first rotating ultrasonic motor (16), a variant winglet slant angle bracket (4), a first winglet rib (5), a second winglet rib (8), a height sliding bracket (6), a first threaded rotating shaft (10), a height bracket sleeve (7), a first threaded sleeve (9), a second threaded rotating shaft (13), a second threaded sleeve (12) and a winglet rotating beam (11). The wing assembled with the variant winglet has the advantages that the structure is smart and simple, the multi-parameter transformation of the winglet is realized, and the aerodynamic performance of an airplane during the stages of taking off and landing, climbing and cruising is greatly promoted.

Wing assembled with variant winglet

The invention discloses a wing installed with variant wingtip winglet and a working mode thereof In the invention, a rotary ultrasonic motor is utilized to directly realize conversion of winglet inclination angle, the rotary ultrasonic motor and a screw mechanism are utilized to realize conversion of winglet height and back sweep angle, and a variable flow control mechanism is utilized to improve flying efficiency of airplane in different flying states The invention has light and simple structure, and can realize multi-parameter conversion of wingtip and greatly improve aerodynamic performance of airplane during takeoff, landing, climbing and cruising periods

Yalei Bai

Papers

In-plane corrugated cosine honeycomb for 1D morphing skin and its application on variable camber wing

Topology optimization of support structure of telescope skin based on bit-matrix representation NSGA-II

Energy harvesting properties of a flapping foil with blow aspirators: A numerical investigation

Wing assembled with variant winglet

Wing installed with variant wingtip winglet and working mode thereof