Study on High Cycle Vibration of Ship Structure

船舶结构高周振动研究

• 批准号: 09555308
• 负责人: KAGAWA Koji
• 金额: $ 4.61万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555308/
• 关键词: Stiffened Plate; Optimal Design; Structure Modification; Marine Propulsion; High Cycle Vibration; Fluid-Structure Coupling; Contribution Factor; Coupled Vibration; 連成振動; 船殻構造; 船内騒音; 船体構造; 船体振動; 防振設計

A ship hull structure is a much complicated steel structure which consists of many stiffened this plates. High cycle vibrations in the ship structure are originated by the propulsion such as a propeller and a main engine and are easily transmitted to the local structures such as a superstructure and water tanks. Fatigue damages can also be sometimes observed in these tanks which seemed to be caused by resonance. In order to make prevention of these problems, following studies have been carried out.1. We developed new method that is to analyze (1) Dynamic interaction between ship hull and main engine by means of substructure approach, (2) Vibratory response considering the influence of moving parts in engine, and (3) Contribution of exciting forces to the vibratory response. We proved that the characteristics of the exciting force from the shaft is much influenced.2. The vibration characteristics of the stiffened plate is examined, and some main vibration modes are studied. In the mult-level optimization, the dynamic characteristics of the stiffened plate is changed by the proposed simplified equation. It is shown that the results are effective in the optimum modification for dynamic characteristics of the stiffened plate.3. Thin walled tank located near the engine or propeller are strongly affected by the added mass of containing water. We have developed a numerical tool of vibration analysis using finite elements for plates and boundary elements for fluid. The effect of added mass of containing water and structural constraint between panels on the vibration characteristics are investigated numerically. Especially natural frequencies and hydrodynamic pressure of breath mode of the water tank are focused on and clarified.

船舶船体结构是由许多加筋板组成的复杂钢结构。船舶结构中的高循环振动由推进器（例如螺旋桨和主机）引起，并且容易传递到局部结构（例如上层建筑和水箱）。在这些坦克中有时也可以观察到疲劳损伤，这似乎是由共振引起的。为了预防这些问题，我们进行了以下研究。1.本文提出了一种新的分析方法：（1）用子结构法分析船体与主机的动力相互作用，（2）考虑主机运动部件影响的振动响应，（3）激振力对振动响应的贡献。证明了轴向激振力的特性对系统的性能有很大的影响.对加筋板的振动特性进行了分析，并对几种主要的振动模态进行了研究。在多级优化中，通过所提出的简化方程改变加筋板的动力特性。结果表明，本文的研究结果对加筋板的动力特性优化修改是有效的.位于发动机或螺旋桨附近的薄壁贮箱受到所含水的附加质量的强烈影响。我们已经开发了一个振动分析的数值工具，使用有限元板和流体边界元。通过数值计算研究了含水附加质量和板间结构约束对结构振动特性的影响。重点分析了水箱呼吸模态的固有频率和动水压力。

项目成果

PARK, Sung Hyeon: "Study on the Optimum Modification Method of Vibration Characteristics of Stiffened Plate Structures by Multi-level Optimization"Journal of the Society of Naval Architects of Japan. No. 186. 431-444 (1999)

PARK, Sung Hyeon：“通过多级优化对加筋板结构振动特性的优化修正方法的研究”日本造船学会会刊。

藤田一誠,香川洸二 他: "船体/主機連成振動応答解析法の研究" 日本造船学会論文集. 184. 397-404 (1998)

Issei Fujita、Koji Kakawa 等：“船体/主机耦合振动响应分析方法的研究”日本造船学会汇刊 184. 397-404 (1998)。

朴成鉉: "多段階最適化手法による防撓板構造物の振動特性の最適変更法に関する研究"日本造船学会論文集. 186号. 431-444 (1999)

Park Seong-hyun：“使用多步优化方法对加强筋结构的振动特性进行优化修改的研究”日本造船学会学报第 186. 431-444 号（1999 年）。

〓城勇: "接水タンク構造の呼吸モードと動的流体圧分布について"西部造船会々報. 99号. 211-223 (2000)

Isamu Jo：“湿式储罐结构的呼吸模式和动态流体压力分布”《西方造船师学会杂志》第 99. 211-223 (2000) 号。

BAE, Sung Yong: "Breath Mode and Pressure Distribution in Fluid-Structure coupled Vibration"Trans. of the West-Japan Society of Naval Architects. No. 99. 211-223 (2000)

BAE、宋勇：《流固耦合振动中的呼吸模式和压力分布》译。