有限元法在船体总振动中的应用

钟万勰; 何穷; 薛惠钰; 杨波

有限元法在船体总振动中的应用

1.
大连工学院;
2.
上海工业大学;
3.
中国船舶科学研究中心

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出版历程
- 收稿日期: 1982-02-27
- 刊出日期: 1983-02-15

A Study on Ship Hull Vibration Using Finite Element Method

1.
Dalian Institute of Technology, Dalian;
2.
Shanghai University of Technology, Shanghai;
3.
The Chinese Ship Scientific Research Center

摘要

摘要: 当用梁理论计算船体振动的高谐调特性时,理论计算值与实际试验量测值有较大偏差.这样,梁理论不能作为计算高协调振动的一个实际可用的方法.本文应用二维和三维有限元模型计算船体垂直振动.采用我们自己编制的多单元结构动力分析程序DDJ(DL)在国产709计算机上计算了船体A和船体B两个船的船体总振动特性. 计算结果与实测结果比较表明,建立的二维有限元模型较之传统梁模型有明显的优越性.理论计算与实测之间的偏差大大改进,其四、五协调的计算误差由原来梁模型的20%.以上降低到5%以内.而且由于计算模型简单,原始数据准备方便,计算时间短的特点,适宜在国产中小型计算机上实施.因而该计算模型可供设计部门在船舶设计阶段较为精确地计算船舶振动特性使用.

Abstract: When the beam theory was used to calculate ship hull vibration,greater discrepancies were found between theoretical calculations and actual measurements especially at higher modes.Thus the beam model cannot be considered as a practical one for higher-mode calculations. This paper presents the application of two-dimensional finite element model for the calculation of ship vertical vibration. Using the multi-element structural dynamic analysis program DDJ(DL) developed by ourselves,the hull vibration analysis of two ships (vessel A and vessel B) was carried out on the Model-709 Computer made in the People's Republic of China.The results of the calculation,when compared with actual measurements,show that the two-dimensional model is much more efficient than the traditional beam model. The agreement between the calculations and measurements has been improved greatly,and this discrepancy at the 4th-and 5th-modes has decreased to within 5% as compared to that of more than 20% in the traditional model. Furthermore,the model is relatively simple,the coat and time required for the computation is comparatively lower and shorter,and the calculation can be carried out on a medium-siezed computer. Therefore,this model is especially appropriate for analyzing the dynamic characteristics of ships at early design stages.

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参考文献(17)

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