Download or read book Scaling for Shock Response of Equipment in Different Submarines written by and published by . This book was released on 1992 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents scaling rules developed to predict the response of submarine equipment subjected to underwater chemical explosions. The computer was used as a surrogate for shock tests by employing the University of Maryland HULL code. A simplified model of a hull section was used to contain a frame- mounted single-degree of freedom equipment. A general scaling rule has been developed to handle the spread in the shock response attributable to the charge size, equipment weight, and equipment frequency. In this report the shock response is considered to be the absolute maximum acceleration of the equipment mass as a function of the shock factor (square root of the energy flux density) for a given charge weight. The report also examines those cases where a new hull is derived from an original hull by the linear scaling law. The solution of the shock response is well known when the internal equipment has also been linearly scaled. A new general scaling rule is developed for those cases when the equipment is not linearly scaled, i.e., the equipment and charge weight used in the original hull remains unchanged when installed in the linearly-scaled hull or a completely different equipment and charge weight are used with the new hull.

Download or read book Scaling for Shock Response of Submarine Equipment written by and published by . This book was released on 1992 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous analysis and studies have illustrated the difficulty in relating the equipment response at different charge weights for the same shock factor. A recent study (1) has shown a promising scaling law that appears valid over a wide range of charge sizes for the same hull. This report examines how far this range may be extended for both lower charge weights and higher charge weights; compares linear and parabolic least square fits of the data which are in the form of equipment peak acceleration response versus shock factor; introduces new scaling rules for equipment weight and equipment frequency for single-degree of freedom equipment; and points out the hazards of extrapolating over a wide range of shock factor using a limited range of data. Two different model submarine hulls, each designed for approximately the same depth, were used in this study. Each model shows a single-degree of freedom equipment as frame mounted. The earlier study showed that a five frame model is adequate for the purpose of the investigation. These hulls were modeled as lumped parameter systems with a polygon of 36 sides to represent the cylindrical hull. The absolute acceleration of the equipment mass is the measure of response of the equipment as a function of the shock factor for a given charge weight. The variation of the equipment response is examined to establish trends that may affect equipment design.

Download or read book The Shock and Vibration Digest written by and published by . This book was released on 1973 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 0 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 The Shock and Vibration Bulletin written by and published by . This book was released on 1968-08 with total page 854 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 Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Department of Defense Appropriations for written by United States. Congress. House. Committee on Appropriations and published by . This book was released on 1974 with total page 1550 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Department of Defense appropriations for 1984 written by United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Defense and published by . This book was released on 1983 with total page 900 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shock hardness Assessment of Submarine Equipment written by R. L. Bort and published by . This book was released on 1977 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Parametric Study of Elastic Response of Submarine Installed Equipment Subjected to UNDEX Underwater Explosion Side On Loading written by Gerald Francis DeConto and published by . This book was released on 1986 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is desirable to perform a study of the elastic responses of submarine hulls and internally attached structures to underwater shock loading. In view of the expense and possible involvement of non-shock testable equipment it is not always desirable to perform actual shock tests utilizing real hulls or SSTV's (Submerged Shock Test Vehicles). With the advent of large scale computing power, numerical methods now exist to predict equipment/hull responses. The ELSHOK (ELASTIC SHOCK) computer code is used to perform a parametric study on a submerged shell with an internally attached substructure. Of particular interest is the phenomenon of dynamic amplification or lack of such in the response of this particular substructure and effects on substructure shell interaction due to varying substructure mass and stiffness subjected to underwater explosion side-on shock loading.

Download or read book Research development test and evaluation written by United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Defense and published by . This book was released on 1974 with total page 1540 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 850 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ASC MSRC Wright Cycles Journal Spring 2006 written by and published by DIANE Publishing. This book was released on with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Government Research Reports written by and published by . This book was released on 1964 with total page 1600 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 1981-05 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report of NRL Progress written by Naval Research Laboratory (U.S.) and published by . This book was released on 1962 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: