Nonlinear thermal free vibration frequency analysis of delaminated shell panel using FEM

2019 ◽  
Vol 224 ◽  
pp. 111011 ◽  
Author(s):  
Chetan K. Hirwani ◽  
Subrata K. Panda
Keyword(s):  
Free Vibration ◽  
Frequency Analysis ◽  
Vibration Frequency ◽  
Free Vibration Frequency ◽  
Shell Panel

Dry Friction Effect on the Work of Viscous Torsion Damper

2016 ◽  
Vol 817 ◽  
pp. 13-18
Author(s):  
Celina Jagiełowicz-Ryznar
Keyword(s):  
Friction Coefficient ◽  
Free Vibration ◽  
Friction Force ◽  
Vibration Frequency ◽  
Forced Vibration ◽  
Dry Friction ◽  
Viscous Damper ◽  
The Real ◽  
Free Vibration Frequency ◽  
Marine Engines

The results of crankshaft forced vibration calculations, including the dry friction force which can be formed in the viscous damper bearing sliding, were presented. This problem concerns the big dampers used in the marine engines. The friction force influence is presented using the function {sign}. Low values of friction coefficient, corresponding to the conditions similar to the real ones, were assumed. In the range of tested value, it was found that the vibration increases linearly, and system free vibration frequency doesn’t change practically.

Frequency Analysis of Rotating Conical Panels: A Generalized Differential Quadrature Approach

2003 ◽  
Vol 70 (4) ◽  
pp. 601-605 ◽  
Author(s):  
T. Y. Ng ◽  
H. Li ◽  
K. Y. Lam ◽  
C. F. Chua
Keyword(s):  
Free Vibration ◽  
Frequency Analysis ◽  
Rotation Frequency ◽  
Frequency Characteristics ◽  
Differential Quadrature ◽  
Governing Equations ◽  
Conical Shells ◽  
Shell Panel ◽  
Generalized Differential ◽  
Special Case

Based on the generalized differential quadrature (GDQ) method, this paper presents, for the first instance, the free-vibration behavior of a rotating thin truncated open conical shell panel. The present governing equations of free vibration include the effects of initial hoop tension and the centrifugal and Coriolis accelerations due to rotation. Frequency characteristics are obtained to study in detail the influence of panel parameters and boundary conditions on the frequency characteristics. Further, qualitative differences between the vibration characteristics of rotating conical panels and that of rotating full conical shells are investigated. To ensure the accuracy of the present results using the GDQ method, comparisons and verifications are made for the special case of a stationary panel.

Isospectral Euler-Bernoulli beams with continuous density and rigidity functions

1987 ◽  
Vol 413 (1844) ◽  
pp. 235-250 ◽  
Keyword(s):  
Boundary Condition ◽  
Free Vibration ◽  
Exact Solutions ◽  
Vibration Frequency ◽  
Flexural Rigidity ◽  
Homogeneous Case ◽  
Continuous Density ◽  
Free Vibration Frequency ◽  
End Conditions ◽  
Vibration Frequency Spectrum

Isospectral systems are those that have exactly the same free-vibration frequency spectrum with respect to a given boundary condition configuration. In this paper, seven different classes of inhomogeneous Euler-Bernoulli beams with continuous density and flexural rigidity functions are found that are analytically solvable and that are isospectral with a homogeneous beam in the clamped-clamped configuration. Of these exact solutions, one class is isospectral with the homogeneous case in all ten distinct configurations obtainable from clamped, sliding and two antiresonant end conditions, whereas another class is isospectral in the six configurations with clamped, hinged or free end conditions. A connection with inverse problems is discussed.

New Method for Measurement of Contact Angle (Droplet Free Vibration Frequency Method)

1999 ◽  
Vol 38 (Part 1, No. 5B) ◽  
pp. 3127-3130 ◽  
Author(s):  
Shigeyuki Yamakita ◽  
Yoshikazu Matsui ◽  
Showko Shiokawa
Keyword(s):  
Contact Angle ◽  
Free Vibration ◽  
Vibration Frequency ◽  
New Method ◽  
Frequency Method ◽  
Free Vibration Frequency

Properties of axial or torsional free-vibration frequency of rods

AIAA Journal ◽  
1975 ◽  
Vol 13 (8) ◽  
pp. 1111-1112 ◽  
Author(s):  
Solly Andy Segenreich ◽  
Paulo Rizzi
Keyword(s):  
Free Vibration ◽  
Vibration Frequency ◽  
Free Vibration Frequency

Mechanical Characteristics Analysis of Sensitive Parameters of Long-Span Steel Truss Suspension Bridge

2011 ◽  
Vol 250-253 ◽  
pp. 3381-3386 ◽  
Author(s):  
Da Wang ◽  
Yi Zhou Zhu
Keyword(s):  
Free Vibration ◽  
Vibration Frequency ◽  
Mechanical Characteristics ◽  
Suspension Bridge ◽  
Vibration Characteristics ◽  
Structure Parameters ◽  
Long Span ◽  
Main Cable ◽  
Free Vibration Frequency ◽  
Central Buckle

In order to study the influences of structure parameters on the structure mechanical characteristics of long-span suspension bridge. The Shiduhe bridge in Hubei Province was taken as the background of this study, The influence on structure line shape and free vibration characteristics of suspension bridge with the change of structure parameters was studied. The results show that main cable stiffness not only has greater effect on the structure shape of long-span suspension bridge, it also has obvious impact on structure free vibration frequency, in addition, the torsion displacement of stiffening girder can be reduced effectively by adding central buckle, it improves structure bending and torsion stiffness significantly, central buckle also can improve free vibration frequency of structure and enhance structure dynamic stability, It shows that the influencing factors of structure static characteristics are restricted by rigidity of main cable, free vibration characteristics are affected by main cable and central buckle, they are not very sensitive to the variations of the parameters of suspender cable, stiffening girder and main tower.

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