Download or read book Naval Shock Analysis and Design written by Rudolph J. Scavuzzo and published by . This book was released on 2000 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Shock Analysis Techniques for Naval Applications written by Jason Sammut and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanical shock requirements are often a major limiting factor in naval designs. To ensure equipment is able to withstand the severe dynamic loading environments caused by near-miss shock events, components must be designed with sufficient shock durability without hindering system performance. Therefore, analyzing the shock response of a component to potential in-service or qualification test environments is a critical step in the design process. However, due to the complexity of these shock events and a system's unique dynamic behavior, substantial inconsistencies exist between test environments, simulation methods, and analysis techniques. This research contributes to the advancement of naval shock analysis by addressing the usage of shock equivalency metrics, shock response analysis methods for qualification tests, and techniques for simulating shock events through existing test data. Although multiple types of shock spectra may be used to compare shock events across a range of frequencies, shock spectra alone cannot be used to determine equivalency between shocks for a given application. This research derives a relationship between shock spectra, modal parameters, and maximum structural response to form a singular metric for shock severity referred to as the Modal-Weighted Shock Spectrum Summation ([lambda]sum). [lambda]sum calculated from different types of shock spectra were shown to be directly correlated to the estimated maximum response parameters of a given structure. Therefore, this metric may be used to quantitatively compare the severity of shock events as applied to a particular structure of interest to better inform the development of shock specifications. Additionally, these derivations guide the appropriate usage of spectrum calculations by identifying which types of shock spectra are directly correlated with specific response parameters. Next, this research proposes the simulation of shock qualification test environments through explicit dynamic analysis to address the limitations presented by existing shock response analysis methods. Utilizing modern modeling techniques and computing power, explicit dynamic analyses are able to capture the response dynamics of potential designs to qualification test environments within reasonable computation times, leading to more relevant and accurate shock analyses. To demonstrate the feasibility of explicit dynamic modeling of qualification test setups, an initial model of the Medium-Weight Shock (MWS) test was created and validated with two sets of experimental data. The shock environment that was produced from this initial model closely matched the existing test data, but it was shown that further characterization of each test setup is necessary to ensure detailed system dynamics are accurately captured with final model validation. MWS simulations of sample test articles were then performed with this initial model, and results were compared to corresponding analyses from existing naval shock analysis methods. This comparison illustrated that, unlike explicit dynamic simulations, the existing analysis methods suppress high-frequency test article response which significantly reduces estimated shock severity compared to qualification test events. This further demonstrated the need to move qualification test analyses toward explicit dynamic simulations for future designs. Finally, a common technique for performing shock test simulations from experimental data was investigated. A comparison of analytical beam dynamics indicated that applying acceleration profiles from internal measurement locations to drive a model of a tested system effectively changes the boundary conditions and excitation profile of that system. Consequently, an acceleration-point-driven model cannot properly replicate the loading environment experienced by a test structure, leading to highly inaccurate dynamic response results. This inequality was derived by comparing the modal responses of an acceleration-point-driven beam model to those of a base-excited beam model, and it was shown that the total dynamic response throughout both beam models cannot be matched for any arbitrary shock input. Three case studies were then performed to demonstrate the disparity between each beam model for different types of sample shock environments. The case studies showed that acceleration-driven models tend to greatly overestimate structural shock response and perform particularly poorly with high-displacement shock events. Therefore, it was concluded that the alternate methods of transient transfer functions, empirical mode decomposition, or shock reconstruction should be further developed to leverage experimental data in future analyses.
Download or read book Mechanical Shock on Naval Vessels written by W. P. Welch and published by . This book was released on 1946 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Shock and Vibration Digest written by and published by . This book was released on 1973 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Science and Engineering of Mechanical Shock written by Carl Sisemore and published by Springer. This book was released on 2019-05-08 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book fills a unique position in the literature as a dedicated mechanical shock analysis book. Because shock events can be extremely damaging, mechanical shock is an important topic for engineers to understand. This book provides the reader with the tools needed to quantitatively describe shock environments and their damage potential on aerospace, civil, naval and mechanical systems. The authors include the relevant history of how shock testing and analysis came to its current state and a discussion of the different types of shock environments typically experienced by systems. Development of single-degree-of-freedom theory and the theory of the shock response spectra are covered, consistent with treatment of shock spectra theory in the literature. What is unique is the expansion to other types of spectra including less common types of shock spectra and energy spectra methods using fundamental principles of structural dynamics. In addition, non-spectral methods are discussed with their applications. Non-spectral methods are almost completely absent from the current books on mechanical shock. Multi-degree-of-freedom shock spectra and multi-degree-of-freedom testing are discussed and the theory is developed. Addressing an emerging field for laboratory shock testing, the authors bring together information currently available only in journals and conference publications. The volume is ideal for engineers, structural designers, and structural materials fabricators needing a foundation to practically analyze shock environments and understand their role in structural design.
Download or read book Background for Mechanical Shock Design of Ships Systems written by G. J. O'Hara and published by . This book was released on 1965 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report has been prepared to describe some of the progress made since World War II in the several areas related to the complex set of problems encountered in shock design and analysis of shipboard systems. It discusses: requirements for shock protection, selection of failure criteria, determination of shock environment, development of analysis and design procedures, results from past research and engineering, and the needs for future research and engineering. Essentially it sketches the evolution from the simple shock design number concept, which is limited, to a more rational approach which can allow the shock design-analysis of unprecedented equipment.
Download or read book Rotating Machinery Structural Health Monitoring Shock and Vibration Volume 5 written by Tom Proulx and published by Springer Science & Business Media. This book was released on 2011-03-24 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rotating Machinery, Structural Health Monitoring, Shock and Vibration, Volume 5 Proceedings of the 29th IMAC, A Conference and Exposition on Structural Dynamics, 2011, the fifth volume of six from the Conference, brings together 35 contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of Rotating Machinery, Structural Health Monitoring, as well as Shock and Vibration, along with other structural engineering areas.
Download or read book Shipboard Shock and Navy Devices for Its Simulation written by and published by . This book was released on 1972 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most damaging aspects of the combat environment to which Navy ships are exposed is the mechanical shock resulting from the explosion of warheads. The detonation of a large weapon at a considerable distance from the ship produces a shipboard shock environment throughout the entire ship which is potentially damaging to all shipboard equipment and systems. Information has been accumulated on the characteristics and operation of the devices specified by MIL-S-901 for the shock testing of shipboard equipment--the Navy HI Class Shock Machines and the Floating Shock Platform. Other shock machines are also used by the Navy and other services but are not considered here. This material has been gathered from many sources, most of which are not readily accessible, and is intended to provide background information. Equipments are accepted for shipboard use if they comply satisfactorily with the shock test and design procedures prescribed by MIL-S-901.
Download or read book Developments in the Analysis and Design of Marine Structures written by Jorgen Amdahl and published by CRC Press. This book was released on 2021-12-17 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developments in the Analysis and Design of Marine Structures is a collection of papers presented at MARSTRUCT 2021, the 8th International Conference on Marine Structures (by remote transmission, 7-9 June 2021, organised by the Department of Marine Technology of the Norwegian University of Science and Technology, Trondheim, Norway), and is essential reading for academics, engineers and professionals involved in the design of marine and offshore structures. The MARSTRUCT Conference series deals with Ship and Offshore Structures, addressing topics in the fields of: - Methods and Tools for Loads and Load Effects; - Methods and Tools for Strength Assessment; - Experimental Analysis of Structures; - Materials and Fabrication of Structures; - Methods and Tools for Structural Design and Optimisation; and - Structural Reliability, Safety and Environmental Protection. The MARSTRUCT conferences series of started in Glasgow, UK in 2007, the second event of the series took place in Lisbon, Portugal in March 2009, the third in Hamburg, Germany in March 2011, the fourth in Espoo, Finland in March 2013, the fifth in Southampton, UK in March 2015, the sixth in Lisbon, Portugal in May 2017, and the seventh in Drubovnik, Croatia in May 2019. The ‘Proceedings in Marine Technology and Ocean Engineering’ series is dedicated to the publication of proceedings of peer-reviewed international conferences dealing with various aspects of ‘Marine Technology and Ocean Engineering’. The Series includes the proceedings of the following conferences: the International Maritime Association of the Mediterranean (IMAM) conferences, the Marine Structures (MARSTRUCT) conferences, the Renewable Energies Offshore (RENEW) conferences and the Maritime Technology (MARTECH) conferences. The ‘Marine Technology and Ocean Engineering’ series is also open to new conferences that cover topics on the sustainable exploration and exploitation of marine resources in various fields, such as maritime transport and ports, usage of the ocean including coastal areas, nautical activities, the exploration and exploitation of mineral resources, the protection of the marine environment and its resources, and risk analysis, safety and reliability. The aim of the series is to stimulate advanced education and training through the wide dissemination of the results of scientific research.
Download or read book A Guide for Design of Shock Resistant Naval Equipment written by United States. Department of the Navy. Bureau of Ships and published by . This book was released on 1949 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shock Analysis of Lumped parameter Systems written by Pennsylvania State University. Department of Engineering Mechanics and published by . This book was released on 1964 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Shock and Vibration Bulletin written by and published by . This book was released on 1963 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the Feasibility of a Transient Dynamic Design Analysis Method written by and published by . This book was released on 1992 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dynamic behavior of structures subject to mechanical shock loading provides a continuing problem for design engineers concerned with shipboard foundations supporting critical equipment. There are two particular problems associated with shock response that were investigated during the course of the grant period. The first topic explores the possibilities of developing a transient design analysis method that does not degrade the current level of the Navy's shock-proofness requirements for heavy shipboard equipment. The second topic examines the prospects of developing scaling rules for the shock response of simple internal equipment of submarines submarines subject to various attack situations. This second topic was further divided into two tasks: chemical explosive scaling for a given hull; and scaling of equipment response across different hull sizes.
Download or read book Numerical Analysis of the Elastic Shock Response of Submarine Installed Equipment written by Mark Steven Welch and published by . This book was released on 1984 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: Motivated by a lack of explosive test data on nuclear submarines, the Navy has sought other means to qualify installed equipment in submarine environments. The currently used method for non-shock testable items is the Dynamic Design Analysis Method (DDAM) developed by the Naval Research Laboratory in the early 1960's. With the advent of large-scale computing power, newer numerical methods have become available to predict equipment responses. This thesis is a comparative study of DDAM and ELSHOK (Elastic Shock); a new generation numerical shock response code. The limitations and strong points of both methods are examined using illustrative examples. Additional keywords: Finite element analysis; Finite difference theory; Elastic shock response; Explosive shock response; COmputer program documentation; User manuals; Mathematical models.
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 Technical Abstract Bulletin written by Defense Documentation Center (U.S.) and published by . This book was released on 1963 with total page 1032 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Signal written by and published by . This book was released on 1995 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
