Suppression of nonlinear flutter of composite panels at supersonic speeds and elevated temperatures

1995 ◽  
Author(s):  
R Zhou
Keyword(s):  
Elevated Temperatures ◽  
Composite Panels ◽  
Nonlinear Flutter

Nonlinear flutter analysis of composite panels

2018 ◽  
Vol 32 (12n13) ◽  
pp. 1840043
Author(s):  
Xiaomin An ◽  
Yan Wang
Keyword(s):  
Dynamic Pressure ◽  
Composite Panel ◽  
Composite Panels ◽  
Nonlinear Finite Element Method ◽  
Nonlinear Flutter ◽  
Unsteady Aerodynamic ◽  
Flutter Analysis ◽  
Time Marching ◽  
Coupled Solution ◽  
Nonlinear Panel Flutter

Nonlinear panel flutter is an interesting subject of fluid–structure interaction. In this paper, nonlinear flutter characteristics of curved composite panels are studied in very low supersonic flow. The composite panel with geometric nonlinearity is modeled by a nonlinear finite element method; and the responses are computed by the nonlinear Newmark algorithm. An unsteady aerodynamic solver, which contains a flux splitting scheme and dual time marching technology, is employed in calculating the unsteady pressure of the motion of the panel. Based on a half-step staggered coupled solution, the aeroelastic responses of two composite panels with different radius of R = 5 and R = 2.5 are computed and compared with each other at different dynamic pressure for Ma = 1.05. The nonlinear flutter characteristics comprising limited cycle oscillations and chaos are analyzed and discussed.

Finite element time domain - Modal formulation for nonlinear flutter of composite panels

AIAA Journal ◽  
1994 ◽  
Vol 32 (10) ◽  
pp. 2044-2052 ◽  
Author(s):  
R. C. Zhou ◽  
David Y. Xue ◽  
Chuh Mei
Keyword(s):  
Finite Element ◽  
Time Domain ◽  
Composite Panels ◽  
Nonlinear Flutter

Nonlinear Response of Carbon-Carbon Composite Panels Subjected to Thermal-Acoustic Loadings

2011 ◽  
Vol 117-119 ◽  
pp. 876-881 ◽  
Author(s):  
Yun Dong Sha ◽  
Fei Xu ◽  
Zhi Jun Gao
Keyword(s):  
High Speed ◽  
Random Vibration ◽  
Nonlinear Response ◽  
Elevated Temperatures ◽  
Thermal Protection ◽  
Random Noise ◽  
Carbon Composite ◽  
Dynamic Responses ◽  
Composite Panels ◽  
Thin Walled

Carbon-Carbon composite materials are widely used as the surface thermal protection systems (TPS) of advanced high-speed air-craft and spacecraft. The thin-walled structures with this kind of materials would exhibit large displacement response under high-level acoustic loads and possibly display buckling at elevated temperatures. Reliable experimental data are difficult to acquire because of the high costs and difficulties with instrumentation at high acoustic intensity and elevated temperatures. Thus, in the design process greater emphasis will likely be placed on improved mathematical and computational prediction methods. Among these researches, the simulation methods for nonlinear response of thin-walled composite panels under thermo-acoustic loadings are being developed emphatically .This paper presents a nonlinear finite element model for analyzing nonlinear random dynamic behaviors of Carbon-Carbon composite panels under the combined effects of thermal and random acoustic loads. The acoustic excitation is assumed to be a band-limited Gaussian random noise and uniformly distributed over the structural surface and the thermal load is assumed to be a steady-state with different predefined temperature distribution. Three types of motion: 1) linear random vibration about one of the two buckled positions, 2) snap-through motion between the two buckled positions, and 3) nonlinear random vibration over the two thermally buckled positions can be predicted. And the dynamic response behaviors of the structures are discussed. Based on this, the influences of sound pressure level (SPL) and elevated temperatures on the dynamic responses are analyzed emphatically.

Nonlinear Flutter of Composite Panels Under Yawed Supersonic Flow Using Finite Elements

AIAA Journal ◽  
10.2514/2.818 ◽  
1999 ◽  
Vol 37 (9) ◽  
pp. 1025-1032 ◽  
Author(s):  
K. Abdel-Motaglay ◽  
R. Chen ◽  
C. Mei
Keyword(s):  
Supersonic Flow ◽  
Finite Elements ◽  
Composite Panels ◽  
Nonlinear Flutter
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