碩士 / 大葉大學 / 機械工程研究所碩士班 / 93 / Consider the situation created by a nuclear or chemical underwater explosion attack upon a surface ship or submarine. There is within the vessel myriad equipment and machinery that must continue to function if the vessel is to survive and fight. And the Dynamic Design Analysis Method (DDAM) is the U.S. Navy’s specified analytical method of qualifying non-testable equipment and supporting structures to withstand the effects of shock. The technique is based on experimental investigations conducted in the 1960’s. Availablity of powerful computer codes, advances in computer technology and analytical correlation studies conducted during recent shock trials has not changed the basic credibility of the DDAM. The DDAM has been used for more than 40 years as part of the U.S. Navy’s efforts to shock-harden heavy shipboard equipment. This spectral method, which has been validated several times, employs normal mode theory, modal effective mass and shock design values. DDAM prescribes a modal analysis approach that utilizes these shock design values in three orthogonal directions and takes into account the type of vehicle and equipment location, that is, hull-mounted, deck-mounted, and shell plate mounted.
Radar mount system, Deisel-Electric engine mount and propulsion shaft are defined as Grade A equipment which are essential for the safety and continued combat capability of the submarine. Therefore in order to evaluate shock resistance under shock environments, this thesis adopts DDAM in conjunction with a shock design spectrum inducted by U.S. Navy after performing full-scale trials in establishing a shock response spectrum analysis, to be coordinated by using finite element’s discrete and calculating procedure. The simple support beam was used to take the explosion shock as an example to verify the effectiveness of the proposed numerical procedure. Analysis results demonstrate a sufficient correlation. Also described herein in detail are the shock responses of Radar mount system, Deisel-Electric engine mount and propulsion shaft. Analysis results provides a valuable reference for shipboard equipment shock resistant design. In addition, the shock mounts are adopted to support the Nave equipment, and isolate shock impact caused by underwater explosion and which are studied in detail. Three MIL-S-901D navysea mounts with diffeent rubber durometer (durometer 30, 50, and 70) are mounted in a Diesel-Electric engine bottom to study the abilities of shock resistant. The research results in this subproject are a valuable reference for shock resistant design of shipboard equipment after considering different potential threats.
| Identifer | oai:union.ndltd.org:TW/093DYU00488031 |
| Date | January 2005 |
| Creators | Hsieh Chi Ta, 謝其達 |
| Contributors | Cho-Chung Liang, 梁卓中 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 134 |
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