Modal Analysis Of The M113 Armored Personnel Carrier Metallic Hull And Composite Hull

An experimental comparative modal analysis was performed on a standard Ml 13 armored personnel carrier and an experimental Ml 13 armored personnel carrier. The objective of this experiment was to provide sufficient experimental data to validate survivability finite element models and to extract modeling parameters and information wherever appropriate. This report details the results of the analysis performed on the data provided by the University of Cincinnati Structural Dynamics Research Laboratory. Each hull was tested in two configurations: a basic configuration consisting of the stripped hull, and a "tight-fitting" configuration consisting of the basic hull configuration to which dynamically linear behaving components, such as the engine, hatches, and doors, were attached to approximate a full-up vehicle. The first elastic mode of the basic metallic hull was observed at 43.3 Hz (0.21% critical damping) while the first elastic mode of the basic composite hull was observed at 27.5 Hz (1.3% critical damping). Numerous local modes of varying degrees of complexity were observed for the tight-fitting configurations. This report describes the characteristics and peculiarities of all observed modes.

This entry in R. P. Hunnicutt's unrivaled 10-volume history of American armored fighting vehicles focuses on the spectrum of armored personnel carriers with a focus on the Bradley fighting vehicle (BFV). Operations in WWII indicated a need for an armored vehicle with improved protection and reliable mobility for transporting soldiers in and out of battle. To address this need, development began on full-tracked armored personnel carriers with overhead protection before WWII came to a close. Development continued into the postwar period. One result of this program was the M59 armored infantry vehicle, which was pioneered as a low-production-cost vehicle and had the added benefit of being amphibious, a quality that became required in all armored personnel carriers that succeeded it. In his trademark style, Hunnicutt surveys the development of each armored personnel carrier since the end of WWII, illustrating his detailed history with line drawings and photographs. He covers the development of the M113, which was employed successfully in Vietnam and served as the basis for a family of vehicles ranging from armored combat vehicles to unarmored cargo carriers. The success of the M113 as a fighting vehicle gave rise to the development of the Bradley fighting vehicle, which was intended for use by both infantry and cavalry units. With all the detail and precision readers have come to expect from R. P. Hunnicutt's histories of American armored vehicles, Bradley is the definitive work on the history of American fighting and support vehicles. An absolute must-have for anyone interested in American military history. Readers interested in related titles from R. P. Hunnicutt will also want to see: Abrams (ISBN: 9781626542556), Armored Car (ISBN: 9781626541559), Half-Track (ISBN: 9781626541320), Patton (ISBN: 9781626548794), Pershing (ISBN: 9781626541672), Sheridan (ISBN: 9781626541542), Sherman (ISBN: 9781626548619), Stuart (History of the American Light Tank, Vol. 1) (ISBN: 9781626548626), Firepower (ISBN: 9781635615036).

Few lessons are as prevalent in military history as is the adage that tanks don't perform well in cities. The notion of deliberately committing tanks to urban combat is anathema to most. In "Breaking the Mold: Tanks in the Cities," Ken Gott disproves that notion with a timely series of five case studies from World War II to the present war in Iraq. This is not a parochial or triumphant study. These cases demonstrate that tanks must do more than merely "arrive" on the battlefield to be successful in urban combat. From Aachen in 1944 to Fallujah in 2004, the absolute need for specialized training and the use of combined arms at the lowest tactical levels are two of the most salient lessons that emerge from this study. When properly employed, well-trained and well-supported units led by tanks are decisive in urban combat. The reverse also is true. Chechen rebels taught the Russian army and the world a brutal lesson in Grozny about what happens when armored units are poorly led, poorly trained, and cavalierly employed in a city. The case studies in this monograph are high-intensity battles in conflicts ranging from limited interventions to major combat operations. It would be wrong to use them to argue for the use of tanks in every urban situation. As the intensity of the operation decreases, the 2nd and 3rd order effects of using tanks in cities can begin to outweigh their utility. The damage to infrastructure caused by their sheer weight and size is just one example of what can make tanks unsuitable for every mission. Even during peace operations, however, the ability to employ tanks and other heavy armored vehicles can be crucial. "Breaking the Mold" provides an up-to-date analysis of the utility of tanks and heavy armored forces in urban combat. The U.S. Army will increasingly conduct combat operations in urban terrain, and it will be necessary to understand what it takes to employ tanks to achieve success in that battlefield environment.

Lightweighting is a concept well known to structural designers and engineers in all applications areas, from laptops to bicycles to automobiles to buildings and airplanes. Reducing the weight of structures can provide many advantages, including increased energy efficiency, better design, improved usability, and better coupling with new, multifunctional features. While lightweighting is a challenge in commercial structures, the special demands of military vehicles for survivability, maneuverability and transportability significantly stress the already complex process. Application of Lightweighting Technology to Military Vehicles, Vessels, and Aircraft assesses the current state of lightweighting implementation in land, sea, and air vehicles and recommends ways to improve the use of lightweight materials and solutions. This book considers both lightweight materials and lightweight design; the availability of lightweight materials from domestic manufacturers; and the performance of lightweight materials and their manufacturing technologies. It also considers the "trade space"-that is, the effect that use of lightweight materials or technologies can have on the performance and function of all vehicle systems and components. This book also discusses manufacturing capabilities and affordable manufacturing technology to facilitate lightweighting. Application of Lightweighting Technology to Military Vehicles, Vessels, and Aircraft will be of interest to the military, manufacturers and designers of military equipment, and decision makers.

Enough about the oil problem. Here?s the solution.Over a few decades, starting now, a vibrant US economy (then others) can completely phase out oil. This will save a net $70 billion a year, revitalize key industries and rural America, create a million jobs, and enhance security.Here?s the roadmap ? independent, peer-reviewed, co-sponsored by the Pentagon ? for the transition beyond oil, led by business and profit.

An updated edition of the classic reference on the dynamics of road and off-road vehicles As we enter a new millennium, the vehicle industry faces greater challenges than ever before as it strives to meet the increasing demand for safer, environmentally friendlier, more energy efficient, and lower emissions products. Theory of Ground Vehicles, Third Edition gives aspiring and practicing engineers a fundamental understanding of the critical factors affecting the performance, handling, and ride essential to the development and design of ground vehicles that meet these requirements. As in previous editions, this book focuses on applying engineering principles to the analysis of vehicle behavior. A large number of practical examples and problems are included throughout to help readers bridge the gap between theory and practice. Covering a wide range of topics concerning the dynamics of road and off-road vehicles, this Third Edition is filled with up-to-date information, including: * The Magic Formula for characterizing pneumatic tire behavior from test data for vehicle handling simulations * Computer-aided methods for performance and design evaluation of off-road vehicles, based on the author's own research * Updated data on road vehicle transmissions and operating fuel economy * Fundamentals of road vehicle stability control * Optimization of the performance of four-wheel-drive off-road vehicles and experimental substantiation, based on the author's own investigations * A new theory on skid-steering of tracked vehicles, developed by the author.