The propagation of elastic surface waves guided by ridges

1972 ◽  
Vol 330 (1582) ◽  
pp. 417-441 ◽  
Keyword(s):  
Finite Element ◽  
Surface Waves ◽  
Experimental Results ◽  
Frequency Range ◽  
Antisymmetric Mode ◽  
Elastic Surface ◽  
Finite Element Technique ◽  
Microwave Electronics ◽  
Element Technique ◽  
Propagation Of Waves

The ‘finite element’ technique is used to investigate numerically the guiding of elastic surface waves by ridges with a view to application in microwave electronics and in seismology. The technique is applied first to other problems with a cylindrical geometry such as the propagation of waves along bars and plates where existing theoretical and experimental results are available for comparison. Finally ridged structures are considered. Dispersion curves and displacement functions are obtained for the lowest mode which is the only one which may, under suitable circumstances, propagate unattenuated. Our results indicate that only the lowest antisymmetric mode is properly trapped by the ridge and that this occurs in a certain frequency range.

The Application of Finite Element Techniques to the Analysis of an Automobile Structure: First Paper: Static Analysis of an Automobile Chassis Frame

1970 ◽  
Vol 185 (1) ◽  
pp. 665-674 ◽  
Author(s):  
R. Ali ◽  
J. L. Hedges ◽  
B. Mills
Keyword(s):  
Finite Element ◽  
Computer Program ◽  
Static Analysis ◽  
Cross Sections ◽  
Experimental Results ◽  
Finite Element Technique ◽  
Beam Elements ◽  
Manufacturing Tolerances ◽  
Element Technique

The finite element technique has been used for the static analysis of a chassis structure. A computer program was developed to predict static deflections under bending and torsion loads. The program is quite general, but its use has been restricted to structures consisting of beam elements only. The effects of shear deflections and tapered beams and manufacturing tolerances of cross sections are also considered. Predictions of static deflections are compared with experimental results.

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.

Second Paper: Stress Analysis of an Automobile Chassis Frame

1970 ◽  
Vol 185 (1) ◽  
pp. 675-682
Author(s):  
J. L. Hedges ◽  
C. C. Norville ◽  
O. Gurdogan
Keyword(s):  
Finite Element ◽  
Computer Program ◽  
Stress Analysis ◽  
Cross Sections ◽  
Experimental Results ◽  
Finite Element Technique ◽  
Beam Elements ◽  
Stress Levels ◽  
Manufacturing Tolerances ◽  
Element Technique

The finite element technique has been used for the stress analysis of a chassis structure. A computer program was developed to predict stress levels under bending and torsion loads. The program is quite general but its use has been restricted to structures consisting of beam elements only. Coarse and refined idealizations of the structure are analysed and the effect of manufacturing tolerances of cross-sections. Predictions of stresses are compared with experimental results.

A Study of Wall Ironing by the Finite Element Technique

1978 ◽  
Vol 100 (1) ◽  
pp. 31-36 ◽  
Author(s):  
E. I. Odell
Keyword(s):  
Finite Element ◽  
Lower Bound ◽  
Cone Angle ◽  
Reduction Ratio ◽  
Operating Parameters ◽  
Finite Element Technique ◽  
Elastic Plastic ◽  
Maximum Reduction ◽  
Load Displacement ◽  
Element Technique

Wall ironing has been analyzed using an elastic-plastic finite element technique. The effects that the ironing ring semi-cone angle and friction have on the maximum reduction ratio are studied in detail. Stress contours are given for a typical set of operating parameters. Several ram load/displacement curves are provided and compared with upper and lower bound loads.

The Effect of Initial Forces on the Hydroelastic Vibration and Stability of Planar Curved Tubes

1974 ◽  
Vol 41 (2) ◽  
pp. 355-359 ◽  
Author(s):  
J. L. Hill ◽  
C. G. Davis
Keyword(s):  
Finite Element ◽  
Internal Pressure ◽  
Constant Curvature ◽  
Elastic Limit ◽  
Center Line ◽  
Finite Element Technique ◽  
Line Shapes ◽  
Circular Arcs ◽  
Out Of Plane ◽  
Element Technique

The effect of initial forces on the vibration and stability of curved, clamped, fluid conveying tubes is analyzed by the finite-element technique. The tubes are initially planar with general center-line shapes approximated by constant curvature arcs. The effect of internal pressure is included. Numerical results are presented with, and without, the effects of the initial in-plane forces, for circular arcs S, L, and spiral configurations. Neglecting initial forces results in out-of-plane buckling, while including these forces prevents buckling within the elastic limit, in all configurations studied.

Sign in / Sign up

Export Citation Format

Share Document