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.

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.

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.

Combined Approximation Reanalysis Coupled With Finite Element Stress Analysis for Multiple Geometric Changes in Early Design Stage

2005 ◽  
Author(s):  
Sachin S. Terdalkar ◽  
Joseph J. Rencis
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Design Stage ◽  
Finite Element Technique ◽  
Early Design ◽  
Early Design Stage ◽  
Machine Element ◽  
Element Technique ◽  
Geometric Changes

In this work a new graphically driven interactive stress reanalysis finite element technique has been developed so that an engineer can easily carry out manual geometric changes in a machine element during the early design stage. The interface allow an engineer to model a machine element in the commercial finite element code ANSYS® and then modify part geometry graphically to see instantaneous graphical changes in the stress and displacement contour plots. A reanalysis technique is used to enhance the computational performance for solving the modified problem; with the aim of obtaining results of acceptable accuracy in as short a period of time in order to emphasize the interactive nature of the design process. Two case studies are considered to demonstrate the effectiveness of the prototype graphically driven reanalysis finite element technique. The finite element type considered is a plane stress four-node quadrilateral based on a homogenous, isotropic, linear elastic material. Each case study considered multiple redesigns. A combined approximation reanalysis method is used to solve each redesigned problem. The first case study considers a plate with a hole with the goal to determine the hole shape that will minimize the stress concentration. The second case study considers a support bracket. The goal is to design the cantilever portion of the bracket to have uniform strength and to minimize the stress concentration at the fillet.

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 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.

Sign in / Sign up

Export Citation Format

Share Document