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, 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)
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, Civil
A. J. Torregrosa, A. Gil, P. Quintero, A. Cremades
Summary: This article provides a general idea of the benefits of optimizing the composite material ply angle for wind turbine blades. It compares two different structures, quasi-isotropic material and oblique fibers, using a validated solver. The importance of a correct structural analysis in the design and manufacturing of the next generation of wind turbine blades is demonstrated.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
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
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, Mechanical
Michelle F. Westin, Jose M. Balthazar, Roberto Gil A. da Silva
Summary: This study investigates post-flutter nonlinearities caused by the high aspect ratio of the wing. Experimental and computational analyses show good agreement in predicting periodic dynamic behavior under different center of gravity conditions. The 0-1 test is recommended for qualitative evaluation in nonlinear experiments, as it accurately predicts dynamic behavior and confirms periodicity in both computational and wind tunnel experiments.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2021)
Article
Engineering, Aerospace
Christoph Kaiser, David Quero
Summary: This paper investigates the importance of aeroelastic sensitivities in the multi-disciplinary optimization methods used in modern aircraft design for flutter solutions. The aeroelastic sensitivities for different aerodynamic damping approximations are derived and the influence of the employed aerodynamic approximation on the required derivatives is highlighted. The effectiveness of the derived formulation for aeroelastic sensitivities using a direct method is verified using a two-degree-of-freedom typical section model and it is shown that the aerodynamic damping approximation has a significant effect on aeroelastic sensitivities, using both the typical section model and the AGARD 445.6 weakened wing model.
Article
Engineering, Mechanical
David Valentin, Carme Valero, Monica Egusquiza, Alexandre Presas
Summary: Solar power installations are increasing globally due to decarbonization policies. However, structural failures in solar trackers, mainly caused by torsional galloping, are becoming more prevalent.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Aerospace
Zawar Haider, Rafic M. Ajaj, Lakmal Seneviratne
Summary: This paper presents an aeroelastic analysis of a polymorphing wing capable of active span extension and passive pitch variation. A finite element model is developed to analyze the effect of design parameters on the wing's behavior, and investigate aeroelastic phenomena such as flutter, divergence, and gust load alleviation. The study also explores the impact of cubic hardening and softening on the wing's aeroelasticity through a nonlinear analysis.
Article
Engineering, Civil
Myrella V. Cabral, Flavio D. Marques, Antonio J. M. Ferreira
Summary: This study investigates the effects of adjacent bays interaction in curved panels under supersonic flutter, revealing severe jumps in LCO amplitudes and sub-critical bifurcation for a specific range of dynamic pressure. These discontinuities are directly related to the nonlinear coupling between adjacent bays and show strong sensitivity to initial conditions.
THIN-WALLED STRUCTURES
(2021)
Review
Engineering, Aerospace
Marco Casoni, Ernesto Benini
Summary: This paper discusses the challenges of aeroelastic phenomena in turbomachinery and emphasizes the importance of flutter modelling in assessing stability boundaries and extending operative life. It provides an overview of computational techniques used over the years, reviews the principal methods for flutter modelling, and describes the most commonly used coupling algorithms. Additionally, it presents insights on model order reduction techniques to reduce computational cost and handle complex phenomena in turbomachinery flutter simulations.
Article
Mechanics
Gefferson C. Silva, Mauricio Donadon, Flavio J. Silvestre
Summary: This study investigates the nonlinear aeroelastic response of high-aspect-ratio wings with ballast at their free tips through experimental and numerical methods. The effects of different chord-wise ballast positions on highly flexible rectangular wings are examined, while a nonlinear finite element beam model is proposed to account for aerodynamic and geometrical nonlinearities. Analysis includes flutter boundaries, limit cycle oscillation amplitudes and frequencies, as well as coupling behavior and nonlinear responses under various attributes.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2021)
Article
Acoustics
Xusheng Mu, Rui Huang, Qitong Zou, Haiyan Hu
Summary: This paper proposes a machine learning-based control law design approach to address the challenge of synthesizing controller parameters for high-dimensional aeroservoelastic systems. By training the policy for synthesizing optimal controller parameters, this approach improves controller performance and demonstrates its application in flexible aircraft flutter suppression.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Engineering, Mechanical
Christopher Mair, Branislav Titurus, Djamel Rezgui
Summary: The study investigates the impact of freeplay structural nonlinearity in tiltrotor aircraft systems, mapping out the dynamical behavior of the systems using Continuation and Bifurcation Methods and quantifying the change in stability boundaries. The results show that the freeplay nonlinearity has a complex effect on the dynamics of both systems, potentially leading to whirl flutter even in parameter ranges predicted to be stable by linear analysis methods.
NONLINEAR DYNAMICS
(2021)
Article
Engineering, Manufacturing
Dinh Quy Vu, Marco Gigliotti, Marie Christine Lafarie-Frenot
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2012)
Article
Engineering, Manufacturing
Dinh-Quy Vu, Marco Gigliotti, Marie Christine Lafarie-Frenot
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2013)
Article
Materials Science, Multidisciplinary
Marco Gigliotti, Loic Olivier, Dinh Quy Vu, Jean-Claude Grandidier, Marie Christine Lafarie-Frenot
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2011)
Article
Engineering, Manufacturing
Quoc Huy Vu, Dinh Quy Vu, Thi Tuyet Nhung Le
INTERNATIONAL JOURNAL OF MANUFACTURING MATERIALS AND MECHANICAL ENGINEERING
(2020)
Proceedings Paper
Engineering, Mechanical
Quoc Huy Vu, Dinh Quy Vu
2016 3RD INTERNATIONAL CONFERENCE ON MECHANICS AND MECHATRONICS RESEARCH (ICMMR 2016)
(2016)