The finite element technique for predicting the natural frequencies, mode shapes and damping values of filamentary composite plates

1986 ◽  
Vol 7 (2) ◽  
pp. 197-213 ◽  
Author(s):  
Lin Dun-xiang ◽  
Ni Rong-gen ◽  
R. D. Adams
Keyword(s):  
Finite Element ◽  
Natural Frequencies ◽  
Composite Plates ◽  
Mode Shapes ◽  
Finite Element Technique ◽  
Element Technique

Third Paper: Dynamic Analysis of an Automobile Chassis Frame

1970 ◽  
Vol 185 (1) ◽  
pp. 683-690 ◽  
Author(s):  
R. Ali ◽  
J. L. Hedges ◽  
B. Mills
Keyword(s):  
Finite Element ◽  
Dynamic Analysis ◽  
Natural Frequencies ◽  
Experimental Results ◽  
Mode Shapes ◽  
Finite Element Technique ◽  
Inertia Matrix ◽  
Element Technique

The finite element technique has been used for the prediction of natural frequencies and mode shapes of a chassis structure. The program developed in Paper 1 was extended by adding an inertia matrix. The effects of shear and tapered beams were also considered and predictions of frequencies and mode shapes are compared with experimental results.

Deflection and Vibration Analysis of a Flexible Fan Blade

1973 ◽  
Vol 15 (6) ◽  
pp. 387-391 ◽  
Author(s):  
M. A. Dokainish ◽  
D. M. Gossain
Keyword(s):  
Finite Element ◽  
Vibration Analysis ◽  
Natural Frequencies ◽  
Cooling System ◽  
Mode Shapes ◽  
Finite Element Technique ◽  
Fan Blade ◽  
Element Technique

Finite-element technique used to obtain deflected configuration, and natural frequencies and mode shapes of flex-fan blades, used in automobile cooling system, as function of speed of fan.

Paper 6: On Predicting Crankshaft Stiffnesses and Frequencies

1967 ◽  
Vol 182 (12) ◽  
pp. 52-57
Author(s):  
I. J. Bickley ◽  
H. McCallion
Keyword(s):  
Finite Element ◽  
Empirical Data ◽  
Natural Frequencies ◽  
Bending Stiffness ◽  
Mode Shapes ◽  
Design Stage ◽  
Finite Element Technique ◽  
Realistic Approach ◽  
Element Technique

Currently design stage calculations of crankshaft stiffnesses involve the extensive use of empirical data. Also, in the calculation of loads on main bearings it is customary to assume the load on any throw to be equally distributed between adjacent main bearings. Before a more realistic approach to the design of crankshafts and main bearings may be made it is necessary to develop and prove a method of analysis. In this paper the finite-element technique is used for predicting the static and vibrational behaviour of crankshafts. The calculated values of axial, torsional, and bending stiffness of a crankshaft, together with its natural frequencies and mode shapes, are compared with experimentally determined values.

Finite Element Analysis on Modal Parameters of Anisotropic Laminated Plates

1988 ◽  
Vol 110 (4) ◽  
pp. 473-477 ◽  
Author(s):  
C. Z. Xiao ◽  
D. X. Lin ◽  
F. Ju
Keyword(s):  
Finite Element ◽  
Shear Deformation ◽  
Transverse Shear ◽  
Natural Frequencies ◽  
Dynamic Properties ◽  
Shear Deformation Theory ◽  
Laminated Plates ◽  
Mode Shapes ◽  
Transverse Shear Deformation ◽  
Element Technique

This paper is concerned with the finite element technique for predicting the dynamic properties of anisotropic fiber-reinforced composite laminated plates. Considering the effect of transverse shear deformation, a higher order shear deformation theory which satisifes the zero shear stress conditions at the upper and bottom surfaces is assumed. The natural frequencies and mode shapes of a rectangular plate with all free edges are obtained by finite element method and the modal damping values by finite damped element technique. An equivalent stiffness method is introduced to reduce computation time. Four different theoretical predictions of natural frequencies and damped values of a laminated plate are compared with experimental results. Discussions on the effect of transverse shear deformation to the dynamic properties of composite plates are given.

Identification of Blockage in a Pipe Using Modal Analysis

2011 ◽  
Author(s):  
Oladapo Bello ◽  
Nishant Virani ◽  
S. Olutunde Oyadiji
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Natural Frequencies ◽  
Free Fluid ◽  
Pipe Network ◽  
Finite Element Technique ◽  
Modal Characteristics ◽  
Acoustic Modes ◽  
Simulation Results ◽  
Element Technique

The use of acoustic finite element modal analysis for simulating and identifying blockage in a pipe network is presented in this paper. The analysis commences with a straight fluid-filled pipe without any flaw. The natural frequencies of the acoustic modes of the fluid in the pipe are computed. Blockages of different magnitudes are introduced at different locations along the length of the pipe. The corresponding natural frequencies of the acoustic modes of the fluid in the pipe are again computed by finite element technique. From these results, the modal characteristics of partially blocked pipes are established and compared with simulation results of defect-free fluid-filled pipes in order to ascertain the defect location and sizes.

scholarly journals Effects of Elliptical Hole on the Correlation of Natural Frequency with Buckling Load of Basalt Laminates Composite Plates

2020 ◽  
Vol 27 (1) ◽  
pp. 216-225
Author(s):  
Buntheng Chhorn ◽  
WooYoung Jung
Keyword(s):  
Free Vibration ◽  
Natural Frequency ◽  
Natural Frequencies ◽  
Basalt Fiber ◽  
Orientation Angle ◽  
Elliptical Hole ◽  
Composite Plates ◽  
Buckling Load ◽  
Mode Shapes ◽  
Geometric Ratio

AbstractRecently, basalt fiber reinforced polymer (BFRP) is acknowledged as an outstanding material for the strengthening of existing concrete structure, especially it was being used in marine vehicles, aerospace, automotive and nuclear engineering. Most of the structures were subjected to severe dynamic loading during their service life that may induce vibration of the structures. However, free vibration studied on the basalt laminates composite plates with elliptical cut-out and correlation of natural frequency with buckling load has been very limited. Therefore, effects of the elliptical hole on the natural frequency of basalt/epoxy composite plates was performed in this study. Effects of stacking sequence (θ), elliptical hole inclination (ϕ), hole geometric ratio (a/b) and position of the elliptical hole were considered. The numerical modeling of free vibration analysis was based on the mechanical properties of BFRP obtained from the experiment. The natural frequencies as well as mode shapes of basalt laminates composite plates were numerically determined using the commercial program software (ABAQUS). Then, the determination of correlation of natural frequencies with buckling load was carried out. Results showed that elliptical hole inclination and fiber orientation angle induced the inverse proportion between natural frequency and buckling load.

scholarly journals Using Pade´ Approximants and Curve-fitting to Approximate Eigenvalues and Eigenvectors for Large Design Changes

1996 ◽  
Vol 118 (1) ◽  
pp. 151-153 ◽  
Author(s):  
J. M. Vance ◽  
J. E. Bernard
Keyword(s):  
Finite Element ◽  
Natural Frequencies ◽  
Solution Process ◽  
Mode Shapes ◽  
Eigenvalues And Eigenvectors ◽  
Computational Burden ◽  
Design Change ◽  
Design Changes ◽  
Develop Software ◽  
Unique Method

Our overall goal is to develop software that facilitates the interactive participation of the designer in the optimization process. We are focusing this research on problems which use finite element solutions as part of the objective function. One challenge to implementing interactive participation in these types of problems is the high computational burden of computing a finite element solution for each design change. The research presented here focuses on a unique method to develop fast approximations for natural frequencies and mode shapes which can be used to avoid the time-consuming re-solution process and which will facilitate interactive design for systems with even large design changes.

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