STRATIGRAPHIC TRAP STUDY IN COTTONWOOD CREEK FIELD, BIG HORN BASIN, WYOMING

Geophysics ◽  
1962 ◽  
Vol 27 (4) ◽  
pp. 427-444 ◽  
Author(s):  
R. L. Sengbush
Keyword(s):  
Cross Sections ◽  
High Frequency ◽  
Synthetic Seismograms ◽  
Tape Recording ◽  
Theory Approach ◽  
Filter Theory ◽  
Seismic Method ◽  
Magnetic Tape Recording ◽  
Seismic Records ◽  
Facies Change

Stratigraphic trap production in the Cottonwood Creek field is controlled by loss in porosity and facies change in the “E” zone of the Phosphoria dolomite. The edge of the field was delineated on the seismic records through loss in amplitude of the high‐frequency “E” zone reflection due to thinning and decrease in velocity contrast of the “E” zone. Variable‐area cross‐sections show vividly this stratigraphic change. This study indicates that present techniques of magnetic tape recording and processing coupled with synthetic seismograms and the attendant filter theory approach to the seismic method have increased the capability of the seismic method to find stratigraphic traps.

Enhanced Vibration Control of Ultrasonic Tooling Using Finite Element Analysis

1991 ◽  
Author(s):  
Kevin O’Shea
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cross Sections ◽  
High Frequency ◽  
Excellent Correlation ◽  
Accurate Identification ◽  
Element Analysis ◽  
Optimum Configuration ◽  
Slot Length ◽  
Design Variables

Abstract The use of finite element analysis (FEA) in high frequency (20–40 kHz), high power ultrasonics to date has been limited. Of paramount importance to the performance of ultrasonic tooling (horns) is the accurate identification of pertinent modeshapes and frequencies. Ideally, the ultrasonic horn will vibrate in a purely axial mode with a uniform amplitude of vibration. However, spurious resonances can couple with this fundamental resonance and alter the axial vibration. This effect becomes more pronounced for ultrasonic tools with larger cross-sections. The current study examines a 4.5″ × 6″ cross-section titanium horn which is designed to resonate axially at 20 kHz. Modeshapes and frequencies from 17–23 kHz are examined experimentally and using finite element analysis. The effect of design variables — slot length, slot width, and number of slots — on modeshapes and frequency spacing is shown. An optimum configuration based on the finite element results is prescribed. The computed results are compared with actual prototype data. Excellent correlation between analytical and experimental data is found.

Electron beam reproducing head for magnetic tape recording

1954 ◽  
Vol AU-2 (1) ◽  
pp. 23-27 ◽  
Author(s):  
A. Skellett ◽  
L. Loveridge ◽  
J. Gratian
Keyword(s):  
Electron Beam ◽  
Magnetic Tape ◽  
Tape Recording ◽  
Magnetic Tape Recording
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