Nonlinear Flutter of Cylindrical Shell Panels Under Yawed Supersonic Flow Using FE

2004 ◽  
Author(s):  
Mohamed Azzouz ◽  
Xinyun Guo ◽  
Adam Przekop ◽  
Chuh Mei
Keyword(s):  
Cylindrical Shell ◽  
Supersonic Flow ◽  
Nonlinear Flutter

scholarly journals Dynamic instability of a compound nanocomposite shell

2021 ◽  
Vol 27 (5) ◽  
pp. 60-70
Author(s):  
N.H. Sakhno ◽  
◽  
K.V. Avramov ◽  
B.V. Uspensky ◽  
◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Cylindrical Shell ◽  
Supersonic Flow ◽  
Uniform Distribution ◽  
Critical Pressure ◽  
Natural Frequencies ◽  
Dynamic Instability ◽  
Element Analysis

Free oscillations and dynamic instability due to supersonic airflow pressure are investigated in a functional-gradient compound composite conical-cylindrical shell made of a carbon nanotubes-reinforced material. Nanocomposite materials with a linear distribution of the volumetric fraction of nanotubes over the thickness are considered. Extended mixture rule is used to estimate nanocomposite’s mechanical characteristics. A high-order shear deformation theory is used to represent the shell deformation. The assumed-mode technique, along with a Rayleigh-Ritz method, is applied to obtain the equations of the structure motion. To analyze the compound structure dynamics, a new system of piecewise basic functions is suggested. The pressure of a supersonic flow on the shell is obtained by using the piston theory. An example of the dynamic analysis of a nanocomposite conical-cylindrical shell in the supersonic gas flow is considered. The results of its modal analysis using the Rayleigh-Ritz technique are close to the natural frequencies of the shell obtained by finite element analysis. In this case, finite element analysis can only be used for shells made of material with a uniform distribution of nanotubes over the thickness. The dependence of the natural frequencies of a compound shell on the ratio of the lengths of the conical and cylindrical parts is studied. The dependence of the critical pressure of a supersonic flow on the Mach numbers and the type of carbon nanotubes reinforcement is investigated. Shells with a concentration of nanotubes predominantly near the outer and inner surfaces are characterized by higher values of natural frequencies and critical pressure than the shells with a uniform distribution of nanotubes or with a predominant concentration of nanotubes inside the shell.

Dynamic Instability of Functionally Graded Carbon Nanotubes-Reinforced Composite Joined Conical-Cylindrical Shell

2021 ◽  
Author(s):  
B. Uspensky ◽  
K. Avramov ◽  
N. Sakhno ◽  
O. Nikonov
Keyword(s):  
Carbon Nanotubes ◽  
Cylindrical Shell ◽  
Supersonic Flow ◽  
Dynamic Instability ◽  
Numerical Study ◽  
Ritz Method ◽  
Functionally Graded ◽  
Reinforced Composite ◽  
Thin Walled ◽  
Functionally Graded Carbon Nanotubes

In this paper, dynamic instability of functionally graded carbon nanotubes (CNTs)-reinforced composite joined conical-cylindrical shell in supersonic flow is analyzed numerically. The higher-order shear deformation theory is applied to describe the stress–strain state of thin-walled structure. The assumed-mode method is used to derive the finite degrees-of-freedom dynamical system, which describes the structure motions. The structure motions are expanded by using the eigenmodes, which are obtained by the Rayleigh–Ritz method. The trial functions, which satisfy the continuity conditions at the cylindrical-cone junction, are used to obtain the eigenmodes. The properties of free vibrations of thin-walled structure are analyzed numerically. The dynamic instability of the joined conical-cylindrical shell in supersonic flow is analyzed using the characteristic exponents. As follows from the numerical study, the dynamic instability is arisen due to the Hopf bifurcation. The dependences of the supersonic flow critical pressure on the Mach number and the type of CNTs distribution are analyzed numerically.

scholarly journals Influence of supersonic flow on nonlinear oscillations of a cylindrical shell

2020 ◽  
Vol 1474 ◽  
pp. 012007
Author(s):  
G Y Baghdasaryan ◽  
M A Mikilyan ◽  
I A Vardanyan ◽  
A V Panteleev
Keyword(s):  
Cylindrical Shell ◽  
Supersonic Flow ◽  
Nonlinear Oscillations

Nonlinear flutter response of cylindrical shell in thermal field and supersonic gas flow

2020 ◽  
Vol 927 ◽  
pp. 012022
Author(s):  
G Y Baghdasaryan ◽  
M A Mikilyan ◽  
I A Vardanyan ◽  
A V Panteleev ◽  
N S Severina
Keyword(s):  
Cylindrical Shell ◽  
Gas Flow ◽  
Thermal Field ◽  
Nonlinear Flutter ◽  
Supersonic Gas Flow

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

Nonlinear flutter of composite panels under yawed supersonic flow using finite elements

AIAA Journal ◽  
1999 ◽  
Vol 37 ◽  
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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