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Development Of A Numerical Simulation Method For Rocky Body Impacts And Theoretical Analysis Of Asteroidal Shapes
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Book Synopsis Development of a Numerical Simulation Method for Rocky Body Impacts and Theoretical Analysis of Asteroidal Shapes by : Keisuke Sugiura
Download or read book Development of a Numerical Simulation Method for Rocky Body Impacts and Theoretical Analysis of Asteroidal Shapes written by Keisuke Sugiura and published by Springer Nature. This book was released on 2020-03-17 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes numerical simulations of collisions between asteroids, based on a unique numerical code developed by the author. The code accurately solves the elastic dynamic equations and describes the effects of fracture and friction, which makes it possible to investigate the shapes of impact outcomes produced by asteroid collisions and subsequent gravitational accumulation of fragments. The author parallelizes the code with high parallelization efficiency; accordingly, it can be used to conduct high-resolution simulations with the aid of supercomputers and clarify the shapes of small remnants produced through the catastrophic destruction of asteroids. The author demonstrates that flat asteroids can only be produced by impacts involving objects with similar mass and low velocity, which suggests that the flat asteroids in our solar system were created in the planet formation era and have kept their shapes until today. The author also shows that asteroid collisions under certain conditions can produce the extremely elongated shape of an interstellar minor body, 1I/‘Oumuamua. In brief, the book offers a comprehensive investigation of asteroid impacts and shapes, making it a uniquely valuable resource.
Author :Astronomisches Rechen-InstitutARI Publisher :Springer Science & Business Media ISBN 13 :3642517587 Total Pages :1746 pages Book Rating :4.6/5 (425 download)
Book Synopsis Literature 1997, Part 1 by : Astronomisches Rechen-InstitutARI
Download or read book Literature 1997, Part 1 written by Astronomisches Rechen-InstitutARI and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 1746 pages. Available in PDF, EPUB and Kindle. Book excerpt: Astronomy and Astrophysics Abstracts is devoted to the recording, summarizing and indexing of astronomical publications throughout the world. Two volumes are scheduled to appear per year. Volume 67 records 10,903 papers covering besides the classical fields of astronomy and astrophysics such matters as space flights related to astronomy, lunar and planetary probes and satellites, meteorites and interplanetary matter, X rays and cosmic rays, quasars and pulsars. The abstracts are classified under more than one hundred subject categories thus permitting quick surveying of the bulk of material published on the same topic within six months. For instance, this volume records 119 papers on minor planets, 155 papers on supernovae, and 554 papers on cosmology.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1988 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Application of Rigid Body Impact Mechanics and Discrete Element Modeling to Rockfall Simulation by : Parham Ashayer
Download or read book Application of Rigid Body Impact Mechanics and Discrete Element Modeling to Rockfall Simulation written by Parham Ashayer and published by . This book was released on 2007 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical modeling can assist in predicting falling rock trajectories and reducing the destruction caused by rockfalls. The majority of existing rockfall simulations are based on particle or lumped-mass models that consider the falling rock as an infinitesimal particle with a concentrated mass. Hybrid models usually find the rock-slope contact point using techniques similar to those used in particle models, while incorporating some aspects of the rigid body collisions for bouncing. There are also some rigid body models that employ simplified mathematical impact models. In the framework of this thesis, the applications of rigid body theory and discrete element modeling to rockfall simulation are investigated. A modified version of the discrete element model (MDEM), which can model impacts using methods similar to low-compliance impact models, is offered. In this model, the normal linear dashpot is replaced by a nonlinear dashpot which dissipates the impact velocity based on the contact normal velocity. A mono-direction sliding unit is added to model low-compliance impacts and the tangential dashpot is removed. Several numerical tests strongly indicate that if shape geometries can be sufficiently approximated by a group of particles, the proposed MDEM can replicate the rebound velocities that are predicted by the application of low compliance rigid body impact models. Application of rigid body impact mechanics (RBIM), originally developed by Stronge, in rockfall simulation is studied and compared with other classical rockfall impact models. The effects of several parameters on widely-used coefficients of restitution are investigated including: rock geometry and slenderness, angle of impact, rock orientation, and slope material properties. A new geometrical rockfall simulation program, GeoRFS, based on rigid body mechanics in two-dimensional space, is developed, where rock geometry can vary from prisms with a randomly generated polygonal cross section to superellipsoids. The trajectories of different rock geometries (e.g., roll-out distances, bounce heights, velocities, and energies) during multiple impacts on flat and inclined impact surfaces are studied. The results strongly suggest that the provided simulation program can satisfactorily replicate the roll-out distances obtained from the in-situ tests performed by the Oregon Department of Transportation using different rock geometries. It is expected that the geometrical simulation tools introduced in this work will replace the particle impact model currently used in rockfall programs.
Book Synopsis Numerical N-body Approach to Binary Asteroid Formation and Evolution by : Carlo Comito
Download or read book Numerical N-body Approach to Binary Asteroid Formation and Evolution written by Carlo Comito and published by . This book was released on 2012 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: Binary asteroids play a role of primary importance in determining some physical parameters difficult to measure from Earth, such as the mass. By studying the origin of binaries in the general frame of gravitational aggregates, we can use them as natural laboratories for granular system physics in microgravity conditions, thus obtaining valuable information for modelling asteroids in general. A large variety exists as for the range of parameters of the observed binary systems, and many possible origins have been suggested for them (catastrophic shattering of a parent object and reaccumulation as multiple bodies, planetary tidal perturbations, cratering, YORP ...). In this work we explore by numerical N-body simulations the dynamics of gravitational aggregates outside the limits of stability for a single body, looking for the most favourable configurations leading to binary systems formation. First we show how common the formation of binary systems in a catastrophic scenario is, well reproducing the variety in the observed population. As a second step we explore the possibility of a gradual shape deformation of an aggregate towards a binary system by the action of a slow perturbing force leading to a possible fission of the body. Our results provide new insights into the formation of asteroid binaries, as shown by a comparison to observations and existing literature.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1994 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Frontiers of Discontinuous Numerical Methods and Practical Simulations in Engineering and Disaster Prevention by : Guangqi Chen
Download or read book Frontiers of Discontinuous Numerical Methods and Practical Simulations in Engineering and Disaster Prevention written by Guangqi Chen and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geophysics & Tectonics Abstracts by :
Download or read book Geophysics & Tectonics Abstracts written by and published by . This book was released on 1987 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards by :
Download or read book Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 2005 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bulletin of the Atomic Scientists by :
Download or read book Bulletin of the Atomic Scientists written by and published by . This book was released on 1970-12 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.
Book Synopsis The Combined Finite-Discrete Element Method by : Antonio A. Munjiza
Download or read book The Combined Finite-Discrete Element Method written by Antonio A. Munjiza and published by John Wiley & Sons. This book was released on 2004-04-21 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: The combined finite discrete element method is a relatively new computational tool aimed at problems involving static and / or dynamic behaviour of systems involving a large number of solid deformable bodies. Such problems include fragmentation using explosives (e.g rock blasting), impacts, demolition (collapsing buildings), blast loads, digging and loading processes, and powder technology. The combined finite-discrete element method - a natural extension of both discrete and finite element methods - allows researchers to model problems involving the deformability of either one solid body, a large number of bodies, or a solid body which fragments (e.g. in rock blasting applications a more or less intact rock mass is transformed into a pile of solid rock fragments of different sizes, which interact with each other). The topic is gaining in importance, and is at the forefront of some of the current efforts in computational modeling of the failure of solids. * Accompanying source codes plus input and output files available on the Internet * Important applications such as mining engineering, rock blasting and petroleum engineering * Includes practical examples of applications areas Essential reading for postgraduates, researchers and software engineers working in mechanical engineering.
Book Synopsis Defending Planet Earth by : National Research Council
Download or read book Defending Planet Earth written by National Research Council and published by National Academies Press. This book was released on 2010-07-21 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: The United States spends approximately $4 million each year searching for near-Earth objects (NEOs). The objective is to detect those that may collide with Earth. The majority of this funding supports the operation of several observatories that scan the sky searching for NEOs. This, however, is insufficient in detecting the majority of NEOs that may present a tangible threat to humanity. A significantly smaller amount of funding supports ways to protect the Earth from such a potential collision or "mitigation." In 2005, a Congressional mandate called for NASA to detect 90 percent of NEOs with diameters of 140 meters of greater by 2020. Defending Planet Earth: Near-Earth Object Surveys and Hazard Mitigation Strategies identifies the need for detection of objects as small as 30 to 50 meters as these can be highly destructive. The book explores four main types of mitigation including civil defense, "slow push" or "pull" methods, kinetic impactors and nuclear explosions. It also asserts that responding effectively to hazards posed by NEOs requires national and international cooperation. Defending Planet Earth: Near-Earth Object Surveys and Hazard Mitigation Strategies is a useful guide for scientists, astronomers, policy makers and engineers.
Author :William Frederick Bottke Publisher :University of Arizona Press ISBN 13 :9780816522811 Total Pages :818 pages Book Rating :4.5/5 (228 download)
Book Synopsis Asteroids III by : William Frederick Bottke
Download or read book Asteroids III written by William Frederick Bottke and published by University of Arizona Press. This book was released on 2002-01-01 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two hundred years after the first asteroid was discovered, asteroids can no longer be considered mere points of light in the sky. Spacecraft missions, advanced Earth-based observation techniques, and state-of-the-art numerical models are continually revealing the detailed shapes, structures, geological properties, and orbital characteristics of these smaller denizens of our solar system. This volume brings together the latest information obtained by spacecraft combined with astronomical observations and theoretical modeling, to present our best current understanding of asteroids and the clues they reveal for the origin an,d evolution of the solar system. This collective knowledge, prepared by a team of more than one hundred international authorities on asteroids, includes new insights into asteroid-meteorite connections, possible relationships with comets, and the hazards posed by asteroids colliding with Earth. The book's contents include reports on surveys based on remote observation and summaries of physical properties; results of in situ exploration; studies of dynamical, collisional, cosmochemical, and weathering evolutionary processes; and discussions of asteroid families and the relationships between asteroids and other solar system bodies. Two previous Space Science Series volumes have established standards for research into asteroids. Asteroids III carries that tradition forward in a book that will stand as the definitive source on its subject for the next decade.
Book Synopsis Planetesimals by : Linda T. Elkins-Tanton
Download or read book Planetesimals written by Linda T. Elkins-Tanton and published by Cambridge University Press. This book was released on 2017-01-26 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt: 16.3 Planetesimals and Planetary Debris Disks
Book Synopsis The Moon's Face by : Grove Karl Gilbert
Download or read book The Moon's Face written by Grove Karl Gilbert and published by . This book was released on 1893 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
