Magnetic modeling of the northeast Tanacross map area

HYPERMAG; an interactive, 2- and 2 1/2-dimensional gravity and magnetic modeling program; version 3.5

Open-File Report ◽

10.3133/ofr93287 ◽

1993 ◽

Cited By ~ 9

Author(s):

R.W. Saltus ◽

R.J. Blakely

Keyword(s):

Magnetic Modeling ◽

Gravity And Magnetic ◽

Dimensional Gravity ◽

Program Version

Download Full-text

Combined gravity and magnetic modeling over Pavagadh and Phenaimata igneous complexes, Gujarat, India: Inference on emplacement history of Deccan volcanism

Journal of Asian Earth Sciences ◽

10.1016/j.jseaes.2013.11.005 ◽

2014 ◽

Vol 80 ◽

pp. 119-133 ◽

Cited By ~ 8

Author(s):

Bijendra Singh ◽

M.R.K. Prabhakara Rao ◽

S.K. Prajapati ◽

Ch. Swarnapriya

Keyword(s):

Deccan Volcanism ◽

Magnetic Modeling ◽

Gravity And Magnetic ◽

Igneous Complexes ◽

History Of

Download Full-text

A new magnetic modeling method for magnetic levitation rotary table

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-201567 ◽

2021 ◽

pp. 1-18

Author(s):

Yongxing Gong ◽

Fengqiu Xu ◽

Xianze Xu ◽

Kaiyang Zhang

Keyword(s):

Magnetic Field ◽

Optimization Design ◽

Magnetic Force ◽

Integral Formula ◽

Translational Motion ◽

Modeling Method ◽

Magnetic Flux Density ◽

Rotary Table ◽

Harmonic Method ◽

Magnetic Modeling

Precision machining fields require the worktable to have a large-scale multi-degree-of-freedom motion capability. In order to provide a more accurate magnetic model for the control strategy decoupling process and the size parameter optimization design process of the maglev rotary table. This paper proposes a new magnetic modeling method based on the Two-Dimensional Harmonic method. Different from the existing harmonic method, this method simultaneously considers the tangential and radial magnetic field changes of circumferential magnetic array. And it eliminates the edge effect of the magnetic flux density distribution in the radial aperiodic direction. The magnetic force and torque are solved by the Lorenz integral formula and the Gaussian quadrature method. In order to verify the accuracy of the TDH method, the boundary element software RadiaTM is used for simulation, and a prototype is made for measurement. The experimental results shown that this method reduced the maximum error of the radial edge magnetic field from 104.19% to 3.29%. And it improved the calculation accuracy of magnetic force and torque by 60.74% and 84.39% respectively. This method does not rely on special example, and is beneficial to cross-platform applications. It is more suitable for realizing the magnetic modeling of the maglev rotary table with both rotational motion and large-stroke translational motion.

Download Full-text

Three-dimensional magnetic modeling of a propagating rift, Galapagos 95°30′W

Journal of Geophysical Research Atmospheres ◽

10.1029/jb091ib03p03395 ◽

1986 ◽

Vol 91 (B3) ◽

pp. 3395-3406 ◽

Cited By ~ 42

Author(s):

Stephen P. Miller ◽

R. N. Hey

Keyword(s):

Three Dimensional ◽

Magnetic Modeling ◽

Propagating Rift

Download Full-text

Electromechanical Wave Analysis Through Transient Magnetic Modeling

IEEE Transactions on Power Delivery ◽

10.1109/tpwrd.2009.2027504 ◽

2009 ◽

Vol 24 (4) ◽

pp. 2336-2343 ◽

Cited By ~ 5

Author(s):

Adam J. Thomas ◽

Satish M. Mahajan

Keyword(s):

Wave Analysis ◽

Magnetic Modeling

Download Full-text

Development of Pinhole Corrosion Management Using MFL

Volume 1: Pipeline and Facilities Integrity ◽

10.1115/ipc2018-78642 ◽

2018 ◽

Author(s):

Guy Desjardins ◽

Joel Falk ◽

Vitaly Vorontsov

Keyword(s):

Magnetic Flux Leakage ◽

Metal Loss ◽

Physical Measurement ◽

Reporting Accuracy ◽

Magnetic Modeling ◽

Number Of Factors ◽

Modeling Software ◽

Measurement Methodology ◽

Integrity Management ◽

Flux Leakage

While In-line Inspection Magnetic Flux Leakage (MFL) tools have been used for many years to successfully manage corrosion related threats, small pinhole-sized metal-loss anomalies remain a significant concern to pipeline operators. These anomalies can grow undetected to develop leaks and cause significant consequences. The physical dimensions of these anomalies, their proximity to and/or interaction with other nearby anomalies can challenge MFL’s detection and sizing capabilities. Other factors such as tool speed, cleanliness of the line and incorrect assumptions have an impact as well. For pipeline operators to develop effective and efficient mitigation programs and to estimate risks to an asset, the underlying uncertainties in detection and sizing of pinholes need to be well understood. By using magnetic modeling software, the MFL response of metal-loss anomalies can be determined, and the effect of a number of factors such as radial position, wall thickness, depth profile, pipe cleanliness and tool speed on MFL response and reporting accuracy can be determined. This paper investigates these factors to determine the leading causes of uncertainties involved in the detection and sizing of pinhole corrosion. The understanding of these uncertainties should lead to improvements in integrity management of pinhole for pipeline operators. This paper first investigates the physical measurement methodology of MFL tools to understand the limitations of MFL technology. Then, comparisons of actual MFL data with field excavation results were studied, to understand the limitations of specific MFL technologies. Finally, recommendations are made on how to better use and assess MFL results.

Download Full-text