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Suppressing nonlinear aeroelastic response of laminated composite panels in supersonic airflows using a nonlinear energy sink

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Chinese Journal of Aeronautics 2021年第2期34卷 376-385页

作者： Jian ZHOU Minglong XU Zhichun YANG Yingsong GU State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace EngineeringXi'an Jiaotong UniversityXi'an 710049China School of Aeronautics Northwestern Polyteclmical UniversityXi'an 710072China

This paper proposes using a Nonlinear Energy Sink(NES) to suppress the nonlinear aeroelastic response of laminated composite panels in supersonic airflows. Relevant aeroelastic equations are established using Hamilton’s principle and a finite element approach, drawing upon Von Karman’s large deflection theory and first order piston theory. The idea of the NES suppression region is proposed and the effects of NES parameters on the NES suppression region are studied in detail. The results show that the nonlinear aeroelastic responses of the panel can be completely suppressed by the Transient Resonance Capture(TRC);the appropriate NES parameter values can increase the critical dynamic pressure for flutter and suppress the nonlinear aeroelastic response effectively. Increasing the mass ratio of the NES can improve the NES suppression region;the nonlinear stiffness coefficient and damping of the NES within a specific range can suppress the nonlinear aeroelastic response. The most effective installation position for a NES is in a specific region behind the center-line of the panel in the direction of the airflow.

关键词： Aeroelasticity Laminated composite panel Nonlinear dynamics Nonlinear energy sink panel flutter Passive suppression

Fluid-structure interaction of panel in supersonic fluid passage

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Journal of Harbin Institute of Technology(New Series) 2008年第5期15卷 663-668页

作者：刘占生张云峰田新 School of Power Machinery and Engineering Harbin Institute of Technology

Fluid-structure interaction of panel in supersonic fluid passage is studied with subcycling and spline interpolation based predict-correct scheme. The passage is formed with two parallel panels, one is rigid and the other is flexible. The interaction between fluid flows and flexible panel is numerically studied, mainly focused on the effect of dynamic pressure and distance between two parallel panels. Subcycling and spline interpolation based predict-correct scheme is utilized to combine the vibration and fluid analysis and to stabilize long-term calculations to get accurate results. It’s demonstrated that the flutter characteristic of flexible panel is more complex with the increase of dynamic pressure and the decrease of distance between two parallel panels. Via analyzing the propagation and reflection of disturbance in passage, it’s determined as a main cause of the variations.

关键词： panel flutter fluid-structure interaction subcycling predict-correct scheme

Effects of Thermo-Mechanical Loads on Aeroelastic Instabilities of Metallic and Composite panels

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Transactions of Nanjing University of Aeronautics and Astronautics 2014年第2期31卷 118-122页

作者： Erasmo Carrera Maria Cinefra Enrico Zappino Lorenzo Succi Department of Mechanical and Aerospace Engineering Politecnico di TorinoCorso Duca degli Abruzzi 24 10129 Torino Italy School of Aerospace Mechanical and Manufacturing Engineering RMIT University Melbourne Australia

panel flutter phenomena can be strongly affected by thermal loads,and so a refined aeroelastic model is ***-order shell theories are used as structural *** aerodynamic forces are described using the Piston *** temperature is considered uniform over the thickness of the *** aero-thermo-elastic model is derived in the framework of the Carrera unified formulation(CUF),therefore the matrices are expressed in a compact form using the″fundamental nuclei″.Composite and sandwich structures are considered and different boundary conditions are taken into *** effects of the thermal load on the aeroelastic behavior are investigated.

关键词： Carrera unified formulation(CUF) panel flutter aeroelasticity aero-thermo-elasticity shell elements