Transformation of the resistivity anomalies from archaeological sites by inversion filtering

Geophysics ◽  
1997 ◽  
Vol 62 (1) ◽  
pp. 36-43 ◽  
Author(s):  
Gregory N. Tsokas ◽  
Panagiotis Tsourlos
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Real Data ◽  
Archaeological Sites ◽  
Element Modeling ◽  
Basic Model ◽  
Resistivity Profiling

The resistivity profiling anomalies that are produced using various arrays are deconvolved by the use of inversion filters. The filters are computed by inverting the effect produced by a simple basic model. The forward computations of the effect of the basic model and all other models used are performed by means of a finite‐element modeling scheme. The filters are designed in such a way that the output is a spike centered over the buried body. Tests with synthetic and real data are presented, which justify the use of the scheme. The scheme is particularly useful in archaeological geophysics where it is important that the presentation of the measured fields are in a form that resembles the result we would have obtained if an excavation had taken place.

Finite Element Modeling of Thermo-Electric Materials

1991 ◽  
Vol 234 ◽  
Author(s):  
D. C. van Duyn ◽  
P. de Vries
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Finite Element Modeling ◽  
Numerical Test ◽  
Thermo Electric ◽  
Element Modeling ◽  
Basic Model ◽  
Electric Materials ◽  
Test Result

ABSTRACTThis paper deals with the modeling of materials in which electric, thermal and cross effects between these are important. Also the effect of a magnetic field is included. A basic model and its FEM implementation are discussed. Some numerical test result are given.

Exact First Order Finite Element Modeling for Eddy Current NDE

1991 ◽  
Vol 3 (1) ◽  
pp. 235-253 ◽  
Author(s):  
L. D. Philipp ◽  
Q. H. Nguyen ◽  
D. D. Derkacht ◽  
D. J. Lynch ◽  
A. Mahmood
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Eddy Current ◽  
Element Modeling ◽  
First Order ◽  
Eddy Current Nde

Tire Vibration Modes and Effects on Vehicle Ride Quality

1993 ◽  
Vol 21 (1) ◽  
pp. 23-39 ◽  
Author(s):  
R. W. Scavuzzo ◽  
T. R. Richards ◽  
L. T. Charek
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Operating Conditions ◽  
Modal Testing ◽  
Ride Quality ◽  
Vibration Modes ◽  
Inflation Pressure ◽  
Passenger Cars ◽  
Element Modeling ◽  
Road Surfaces

Abstract Tire vibration modes are known to play a key role in vehicle ride, for applications ranging from passenger cars to earthmover equipment. Inputs to the tire such as discrete impacts (harshness), rough road surfaces, tire nonuniformities, and tread patterns can potentially excite tire vibration modes. Many parameters affect the frequency of tire vibration modes: tire size, tire construction, inflation pressure, and operating conditions such as speed, load, and temperature. This paper discusses the influence of these parameters on tire vibration modes and describes how these tire modes influence vehicle ride quality. Results from both finite element modeling and modal testing are discussed.

Evolving the Banded Radial Tire

1987 ◽  
Vol 15 (1) ◽  
pp. 30-41 ◽  
Author(s):  
E. G. Markow
Keyword(s):  
Finite Element ◽  
Wear Rate ◽  
Finite Element Modeling ◽  
Laboratory Tests ◽  
Rolling Resistance ◽  
Two Dimensional ◽  
Theoretical Discussion ◽  
Radial Tire ◽  
Puncture Resistance ◽  
Element Modeling

Abstract Development of the banded radial tire is discussed. A major contribution of this tire design is a reliable run-flat capability over distances exceeding 160 km (100 mi). Experimental tire designs and materials are considered; a brief theoretical discussion of the mechanics of operation is given based on initial two-dimensional studies and later on more complete finite element modeling. Results of laboratory tests for cornering, rolling resistance, and braking are presented. Low rolling resistance, good cornering and braking properties, and low tread wear rate along with good puncture resistance are among the advantages of the banded radial tire designs.

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