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 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 Fluid structure Interaction written by Cedric Leblond and published by John Wiley & Sons. This book was released on 2022-11-30 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive overview of the numerical simulation of fluid–structure interaction (FSI) for application in marine engineering. Fluid–Structure Interaction details a wide range of modeling methods (numerical, semi-analytical, empirical), calculation methods (finite element, boundary element, finite volume, lattice Boltzmann method) and numerical approaches (reduced order models and coupling strategy, among others). Written by a group of experts and researchers from the naval sector, this book is intended for those involved in research or design who are looking to gain an overall picture of hydrodynamics, seakeeping and performance under extreme loads, noise and vibration. Using a concise, didactic approach, the book describes the ways in which numerical simulation contributes to modeling and understanding fluid–structure interaction for designing and optimizing the ships of the future.
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 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 Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Marine Research written by and published by . This book was released on 1969 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report written by United States. Office of Naval Research and published by . This book was released on 1950 with total page 92 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 908 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book AGARD Index of Publications written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1986 with total page 410 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 1969 with total page 1090 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government wide Index to Federal Research Development Reports written by and published by . This book was released on 1967-10 with total page 1020 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-06 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Summary of Research 1995 written by United States. Naval Postgraduate School, Monterey, CA. and published by . This book was released on 1995 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Naval Engineers Journal written by and published by . This book was released on 1997 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research and Technology Program Digest Flash Index written by and published by . This book was released on 1967 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ERDA Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
