Download or read book Critical Velocity of Electromagnetic Gun in Response to Projectile Movement written by Jerome T. Tzeng and published by . This book was released on 2001 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: A model is developed to investigate the dynamic response of an electromagnetic (EM) rail gun, induced by a moving magnetic pressure during launch of projectiles. As the projectile velocity approaches a critical value, resonance can occur and cause high amplitude stress and strain in the rail at the instant and location of projectile's passage. In this study, governing equations of a railgun under dynamic loading conditions are derived that illustrate a lower-bound critical velocity in terms of material properties, geometry, and barrel cross-section. That represents the worst case or a lower bound solution for the structure under a dynamic loading condition. A study is then performed to show the effect of these parameters on the critical velocity of the barrel. Accordingly, the model that accounts for projectile velocity and gun construction can be used to guide and improve barrel design.
Download or read book Critical Velocity of Electromagnetic Rail Gun in Response to Projectile Movement written by and published by . This book was released on 2002 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: A model is developed to investigate file dynamic response of an electromagnetic rail gun induced by a moving magnetic pressure during launch of projectiles. As the projectile velocity approaches a critical value, resonance can occur and cause high-amplitude stress and strain in the rail at the instant and location of the projectile's passage. In this study, governing equations of a railgun under dynamic-loading conditions are derived that illustrate a lower-bound critical velocity in terms of material properties, geometry, and barrel cross section. A study is then performed to show the effect of these parameters on the critical velocity of the barrel. Accordingly, the model that accounts for projectile velocity and gun construction can be used to guide barrel design.
Download or read book Critical Velocity of Electromagnetic Rail Gun in Response to Projectile Movement written by Jerome T. Tzeng and published by . This book was released on 2002 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: A model is developed to investigate file dynamic response of an electromagnetic rail gun induced by a moving magnetic pressure during launch of projectiles. As the projectile velocity approaches a critical value, resonance can occur and cause high-amplitude stress and strain in the rail at the instant and location of the projectile's passage. In this study, governing equations of a railgun under dynamic-loading conditions are derived that illustrate a lower-bound critical velocity in terms of material properties, geometry, and barrel cross section. A study is then performed to show the effect of these parameters on the critical velocity of the barrel. Accordingly, the model that accounts for projectile velocity and gun construction can be used to guide barrel design.
Download or read book American Society for Composites American Society for Testing And Materials Committee D30 written by Erian Armanios and published by DEStech Publications, Inc. This book was released on 2004-10 with total page 1464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Highlights the recent developments in the fundamental understanding of composites; important information for researchers and composite scientists.
Download or read book Acceleration of an Initially Moving Projectile written by Miguel Del GÃ1⁄4ercio and published by . This book was released on 2009-07-31 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the early 1980s, the principal mission for railguns required launch velocities in excess of 3 km/s. The focus of the research was centered on railguns employing plasma armatures. Significant efforts were expended on understanding the fundamentals of plasma armatures and their interaction with the bore. The temperatures associated with plasma armatures in railguns typically exceed 2 eV and, as a result, cause significant degradation in the bore materials leading to degradation of railgun performance. One parameter that seemed to ameliorate the effect of long dwell time was the use of a projectile injected into the breech of the railgun. This technique was often used with inert gas as the propulsive media. However, propellants were evaluated (1) and used to inject propellant-accelerated projectiles into the breech of a railgun (2). The burning propellant gases were insufficiently conductive to break down and form a plasma arc with 6000 V applied across the breech of the railgun. While no deleterious interactions were noted between the combustion products and plasma electrodynamics, the research was plagued with large variability in the injection velocity, obturation in the squarebore railgun, and reliable initiation of the plasma. All challenges were eventually solved. More recently, the mission for railguns has found utility using velocities
Download or read book A High velocity Gun Employing a Shock compressed Light Gas written by Carlton Bioletti and published by . This book was released on 1960 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Armor written by and published by . This book was released on 2009 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book You Pay We Slay written by William Alan Webb and published by Hit World Press. This book was released on 2022-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Want somebody dead? If you do, the solution's easy. Hire LifeEnders, Inc. You pay. We slay.Whether you know it or not-whether you believe it or not-the world is a dangerous place full of criminals, terrorists, monsters, sorcerers, extra-terrestrials, inter-dimensional predators, and embarrassing relatives. And, for the right price, they can all go away.Twenty years ago, LifeEnders became the first legal corporation of assassins to operate on U.S. soil. Today, LEI has a hit man in every state and many foreign nations. Getting rid of the scammer who catfished Grandma only requires the requisite credit line, and porch thieves now think twice if a security camera might identify them. You pay; we slay. No questions asked.But it's not just about putting a target in the cross-hairs. Sometimes the job requires 'Special Skills,' and that costs extra. If a giant orange rhinoceros appears in the sky? Call LEI and let the Special Activities Division handle it?and don't forget your credit card.The first Hit World anthology brings together an all-star lineup of amazing authors guaranteed to keep you awake past bedtime.Sorry. (Not Sorry)
Download or read book Hearing on National Defense Authorization Act for Fiscal Year 2009 and Oversight of Previously Authorized Programs Before the Committee on Armed Services House of Representatives One Hundred Tenth Congress Second Session written by United States. Congress. House. Committee on Armed Services. Subcommittee on Terrorism, Unconventional Threats, and Capabilities and published by . This book was released on 2009 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1996 with total page 944 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report to the Congress on the Strategic Defense Initiative written by Strategic Defense Initiative Organization (U.S.) and published by . This book was released on 1990 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hypervelocity Gouging Impacts written by John D. Cinnamon and published by Progress in Astronautics and Aeronautics Series. This book was released on 2009 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: When materials interact at hypervelocityon the order of Mach 8.5 and aboveunexpected results can occur. This book addresses the effects of hypervelocity impact, summarizing past and present research efforts as well as setting out the theoretical foundation for understanding material interactions at such velocity. It focuses on research conducted at the Holloman Air Force Base High Speed Test Track (HHSTT), which is working toward a test vehicle speed above Mach 10. Researchers have found that as the sleds speed has increased to Mach 8.5, a material interaction has developed which causes gouging in the rails and the sleds shoeswhich can lead to catastrophic failure.
Download or read book Government Reports Annual Index written by and published by . This book was released on 1994 with total page 1688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Athenaeum written by and published by . This book was released on 1862 with total page 844 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Athenaeum and Literary Chronicle written by James Silk Buckingham and published by . This book was released on 1862 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt:
