scholarly journals Model Penghindaran Tabrakan Multi Obyek Menggunakan Repulsive Field

2021 ◽  
Author(s):  
akuwan saleh
Keyword(s):  
Potential Field ◽  
Sphere Detection

Mendeteksi tabrakan antar obyek dan menampilkan gerakan penghindaran tabrakan yang alami menjadi topik yang diinginkan dalam berbagai aplikasi navigasi agen otonom. Pada umumnya, gerakan penghindaran tabrakan multi obyek statis dan dinamis secara alami banyak menggunakan teknik dengan pengambilan keputusan untuk bergerak menghindar kearah lain. Teknik penghindaran ini mengalami kesulitan ketika jumlah obyek diperbanyak. Pada penelitian ini menyajikan teknik yang mampu menampilkan gerakan penghindaran tabrakan multi obyek statis dan dinamis secara alami. Metode yang digunakan Sphere-Plane Detection (SPD) dan Sphere-Sphere Detection (SSD) untuk mendeteksi tabrakan dengan referensi jarak dan metode potential field jenis repulsive untuk penghindaran tabrakan. Pengujian dilakukan dengan jumlah obyek 100 yang terdiri dari 34 agen A, 33 agen B dan 33 agen C, multi penghalang dengan dan tanpa repulsive, penghalang statis dan dinamis, serta diuji dalam animasi boid. Dari pengujian yang telah dilakukan diperoleh nilai vektor |V| dari posisi awal sampai ke tujuan untuk agen A2 sebesar 51.4522, agen B1 bernilai 45.0853 dan agen C4 sebesar 27.7237, setiap agen memiliki lebih dari satu jalur untuk menuju tujuan, didapatkan tiga model gerakan penghindaran dan tiga parameter yang mempengaruhi gerakan agen yaitu perubahan nilai repulsive, jarak antar penghalang dinamis.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

An Augmented Iteratively Re-weighted and Refined Least Squares Method for lp Minimization Problem in Inverse Modeling of Potential Field Magnetic Data

2020 ◽  
Vol 1 (3) ◽  
Author(s):  
Maysam Abedi
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Least Squares ◽  
Minimization Problem ◽  
Potential Field ◽  
Field Data ◽  
Least Squares Method ◽  
Porphyry Copper ◽  
Magnetic Data ◽  
Magnetic Field Data

The presented work examines application of an Augmented Iteratively Re-weighted and Refined Least Squares method (AIRRLS) to construct a 3D magnetic susceptibility property from potential field magnetic anomalies. This algorithm replaces an lp minimization problem by a sequence of weighted linear systems in which the retrieved magnetic susceptibility model is successively converged to an optimum solution, while the regularization parameter is the stopping iteration numbers. To avoid the natural tendency of causative magnetic sources to concentrate at shallow depth, a prior depth weighting function is incorporated in the original formulation of the objective function. The speed of lp minimization problem is increased by inserting a pre-conditioner conjugate gradient method (PCCG) to solve the central system of equation in cases of large scale magnetic field data. It is assumed that there is no remanent magnetization since this study focuses on inversion of a geological structure with low magnetic susceptibility property. The method is applied on a multi-source noise-corrupted synthetic magnetic field data to demonstrate its suitability for 3D inversion, and then is applied to a real data pertaining to a geologically plausible porphyry copper unit.  The real case study located in  Semnan province of  Iran  consists  of  an arc-shaped  porphyry  andesite  covered  by  sedimentary  units  which  may  have  potential  of  mineral  occurrences, especially  porphyry copper. It is demonstrated that such structure extends down at depth, and consequently exploratory drilling is highly recommended for acquiring more pieces of information about its potential for ore-bearing mineralization.

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