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Modeling and analysis of a novel magnetic levitation gravity compensator
2014 17th International Symposium on Electromagnetic Launch Technology, 2014In this paper, a novel cylindrical magnetic levitation gravity compensator is proposed, of which the mover is composed of several permanent magnet rings in the arrangement of Halbach structure and the stator is composed of one permanent magnet ring and four copper coils.
He Zhang +3 more
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Analytical Modeling of Magnetic and Gravity Signatures of Unexploded Ordnance
Journal of Environmental & Engineering Geophysics, 2001The dominant cost and time driver in unexploded ordnance (UXO) cleanup is the necessity of digging (excavating) “false alarm” gèophysical anomalies. As many as 75% of all the anomalies investigated are false alarms, e.g., scrap metal, ordnance debris, cans, wire, etc.
Dwain K. Butler +2 more
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Pure and Applied Geophysics, 2019
Cross-gradients joint inversion of gravity and magnetic data is the focus of this work. Cross-gradients are introduced as a constraint in the minimization of a least square functional including the misfits of the available data. We propose to initialize the cross gradients iterations with a surrogate density model. The latter is constructed by means of
Emilia Fregoso +2 more
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Cross-gradients joint inversion of gravity and magnetic data is the focus of this work. Cross-gradients are introduced as a constraint in the minimization of a least square functional including the misfits of the available data. We propose to initialize the cross gradients iterations with a surrogate density model. The latter is constructed by means of
Emilia Fregoso +2 more
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Joint inversion of gravity and magnetic data for a two-layer model
Applied Geophysics, 2008Based on the synchronous joint gravity and magnetic inversion of single interface by Pilkington and the need of revealing Cenozoic and crystalline basement thickness in the new round of oil-gas exploration, we propose a joint gravity and magnetic inversion method for two-layer models by concentrating on the relationship between the change of thickness ...
Fan Jiang, Jiansheng Wu, Jialin Wang
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Analytic signal and gradients analysis applied to gravity and magnetic modelling
Proceedings, 1996Analysis of the three-dimensional analytic signal has proved to be a suitable tool for depth estimations in gravity and magnetic data interpretation (Nabighian, 1972 and 1974, Roest et al. 1992). Moreover this method involves as few assumptions as possible on the sources distribution.
P. Bernard, N. Debeglia
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Modeling and Analysis of a Large-Load Magnetic Levitation Gravity Compensator
2019 22nd International Conference on Electrical Machines and Systems (ICEMS), 2019A large-load magnetic levitation gravity compensator is proposed in this paper, which can be used as the passive support scheme for the large optical facilities to achieve the ground testing. The magnetic levitation gravity compensator is composed of three layers of 2D PM array, the middle of which is the mover.
He Zhang +5 more
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Depth Estimation for Magnetic/Gravity Anomaly Using Model Correction
Pure and Applied Geophysics, 2017The Tilt-depth method has been widely used to determinate the source depth of a magnetic anomaly. In the present study, we deduce similar Tilt-depth methods for both magnetic and gravity data based on the contact and sphere models and obtain the same equation for a gravity anomaly as that for a magnetic anomaly.
Pengfei Liu +6 more
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Gravity and magnetic models of the Midcontinent Rift in eastern Lake Superior
Canadian Journal of Earth Sciences, 1994Gravity and magnetic models of the Midcontinent Rift (MCR) in eastern Lake Superior supplement recent structural and stratigraphic interpretations based on the seismic reflection method. An algorithm developed to accommodate spatially varying direction and magnitude of magnetization within a magnetic source is used in both forward and inverse modeling
John Mariano, William J. Hinze
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A new method for modeling marine gravity and magnetic anomalies
Journal of Geophysical Research, 1974A very fast technique involving Fourier transformation can find the gravity or magnetic anomaly of an irregular crustal model as observed on a plane above the material. It is shown how the method can be used to invert the magnetic field data to obtain a magnetization model, but the model so obtained is not unique.
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Gravity and magnetic field modeling and structure of the Chicxulub Crater, Mexico
Journal of Geophysical Research: Planets, 1994The Chicxulub crater is an ∼180‐km‐diameter peak‐ring crater based on drill hole logs and samples, potential fields, seismic reflection profiles, and surface fracture patterns. A structural cross section produced based on these constraints has the features expected for a large complex impact crater.
Mark Pilkington +2 more
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