Article
Engineering, Aerospace
Natsuki Tsushima, Kenichi Saitoh, Kazuyuki Nakakita
Summary: This paper investigates the potential of wing models fabricated by metal additive manufacturing for transonic flutter wind tunnel testing. The study introduces the concept of a transonic flutter wing model fabricated with AM technique and its design and manufacturing methodology. The feasibility and capability of such AM-based transonic flutter wing models for wind tunnel testing are demonstrated through numerical and experimental evaluations.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Rossana Fernandes, Benyang Hu, Zhichao Wang, Zheng Zhang, Ali Y. Tamijani
Summary: This study evaluates the feasibility of additively manufactured wind tunnel models and validates a computational framework for evaluating the performance of wing models. The results show that additive manufacturing can create complex and accurate models, and homogenization-based topology optimization can generate designs with superior stiffness.
RAPID PROTOTYPING JOURNAL
(2023)
Article
Engineering, Aerospace
Natsuki Tsushima, Kenichi Saitoh, Hitoshi Arizono, Kazuyuki Nakakita
Summary: Additive manufacturing technology has the potential to reduce manufacturing costs and facilitate the study of aerodynamic and aeroelastic characteristics of new designs in aerospace structures, particularly in the context of wind tunnel testing.
Article
Chemistry, Multidisciplinary
Liuyue Bai, Zhigang Wu, Chao Yang
Summary: This study provides novel perspectives on the nonlinear aeroelastic characteristics of all-movable fins with freeplay nonlinearities. An unsteady aerodynamic model based on the second-order piston theory considering thickness effects is employed. A discrete scanning method using the describing function method is established for systems with multiple freeplay nonlinearities to solve limit-cycle oscillations (LCOs) and avoid solution loss. The influence of support stiffness and freeplay size ratio on the system's dynamical response is analyzed.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Mechanical
Xiangyu Wang, Zhigang Wu, Yukai Sun, Chao Yang
Summary: This paper introduces a novel method named the dual quasi-harmonic balance (DQHB) method for quick estimations on freeplay-induced limit-cycle oscillations (LCOs). Wind tunnel tests confirm that the DQHB method produces similar results to the describing function (DF) method and time integrations, while also predicting jump and hysteresis phenomena.
JOURNAL OF FLUIDS AND STRUCTURES
(2021)
Article
Thermodynamics
Kun Wang, Wei Xia, Jiayuan Ren, Weiwei Yu, Haocheng Feng, Shuling Hu
Summary: This study investigates the environmental adaptation of wind energy harvesters by mimicking the fluttering of leaves. Through aeroelastic modeling and laboratory testing of Palm leaves, the mechanism of leaf flutter is understood and an artificial leaf wind energy harvester is designed and tested in a wind tunnel. The study highlights the bio-inspired design of wind energy harvesters with low cut-in wind speed and stable output frequency.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Engineering, Aerospace
Yang Meng, Zhiqiang Wan, Changchuan Xie, Chao An
Summary: A theoretical formulation for time-domain nonlinear aeroelastic analysis of a flexible wing model is presented and validated by wind tunnel tests. The proposed method is suitable for determining the nonlinear flutter boundary and simulating the gust response of flexible wings in the time domain, as shown by comparisons of theoretical and experimental results.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Engineering, Aerospace
Shuaishuai Liu, Rui Zhao, Kaiping Yu, Bowen Zheng
Summary: This paper proposes a backbone-curve-based framework for the identification of folding fins with freeplay nonlinearity. The method is more direct and elegant than most existing nonlinear identification approaches and consists of three steps: obtaining the linear model, solving the backbone curves analytically, and identifying the freeplay parameters through curve fitting. Numerical experiments and a real-life example demonstrate the effectiveness of the proposed method.
CHINESE JOURNAL OF AERONAUTICS
(2022)
Article
Engineering, Mechanical
Xinghua Zhou, Rui Huang
Summary: This paper presents a novel parameterized nonlinear aeroelastic modeling methodology for representing the nonlinear dynamics of a folding wing, demonstrating its accuracy and efficiency. Numerical results show that the method can accurately predict the wing's vibrations and limit-cycle oscillations.
NONLINEAR DYNAMICS
(2021)
Article
Engineering, Civil
T. Argentini, D. Rocchi, C. Somaschini, U. Spinelli, F. Zanelli, A. Larsen
Summary: This paper compares three different approaches to assess the aerodynamic stability of twin-box decks: experimental free-motion tests, numerical simulations using quasi-steady theory, and numerical simulations using flutter derivatives. By comparing the results of different deck configurations, it is found that even though they are geometrically very similar, their aeroelastic behavior differs significantly in terms of critical flutter speed, eigenvalue/eigenvector trend, and static deformation. Each method has its advantages and disadvantages, which are highlighted and discussed throughout the paper.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Review
Engineering, Multidisciplinary
Binbin Lv, Jun Zha, Kaichun Zeng, Hongtao Guo, Li Yu, Peng Zhang
Summary: This paper reviews the recent progress in aeroelastic issues, numerical simulations, and wind tunnel tests of morphing aircrafts. It highlights the technological bottlenecks in the evaluation of aerodynamic characteristics and mechanism, and emphasizes the significant impact of unstable aerodynamic forces on aircraft handling characteristics, control law design, and flight safety.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2022)
Article
Engineering, Aerospace
Sayed Hossein Moravej Barzani, Hossein Shahverdi
Summary: This paper investigates the aeroelastic instability of folding wings using the geometrically exact fully intrinsic beam equations. These equations have advantages over other structural beam equations in terms of complete modeling without simplifying assumptions in large deformations, low-order nonlinearities, and less complexity. The main novelty of this study is the implementation of folding angles in the geometrically exact fully intrinsic beam equations. The stability of the folding wing is evaluated by obtaining the eigenvalues of the linearized system and the effects of important parameters on the flutter speed are investigated.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING
(2023)
Article
Engineering, Aerospace
Ilias Tsatsas, Alessandro Pontillo, Mudassir Lone
Summary: This study presents the estimation of aeroelastic damping for a highly flexible high-aspect-ratio wing using wind-tunnel test data. Four different methods were compared, and their benefits and limitations were analyzed. The results showed clear dependency on freestream velocity, and the contribution of structural damping and aerodynamic damping was evaluated using ground vibration test data.
JOURNAL OF AEROSPACE ENGINEERING
(2022)
Article
Engineering, Mechanical
Guangzhong Gao, Ledong Zhu, Jiawu Li, Wanshui Han, Libo Wei, Qingchen Yan
Summary: This study investigates the post-flutter bifurcation behavior of a twin-box bridge deck and finds that the aerodynamic nonlinearities significantly affect the stability of the bridge deck. A novel wind-tunnel technique is used to measure the aerodynamic force during post-flutter oscillations, and a corresponding nonlinear model is proposed to describe the observed behavior.
JOURNAL OF FLUIDS AND STRUCTURES
(2022)
Article
Engineering, Aerospace
Franco Auteri, Alberto Savino, Alex Zanotti, Giuseppe Gibertini, Daniele Zagaglia, Yannick Bmegaptche Tekap, Marianna Braza
Summary: The Smart Morphing & Sensing (SMS) project investigated the use of intelligent electro-active actuators to modify the lifting surface of an aircraft. Wind-tunnel tests were performed to evaluate the morphed aerodynamic shapes of a high-lift morphing flap. The results showed that morphing the trailing-edge flap can optimize the aerodynamic performance of the wing during take-off and landing.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
