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

计量
- 文章访问数: 1683
- HTML全文浏览量: 59
- PDF下载量: 571
- 被引次数: 0
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.

HTML全文

参考文献(17)

[1]	严书邦,薛惠钮,庄和勋,李昌龙,船舶自由振动计算方法,舰船性能研究,(1977,1).
[2]	陈鑫森,金咸定,船舶总振动的迁移矩阵计算程序及其应用研究,上海交大研究报告,(1978).
[3]	马广宗,应用Riccati迁移矩阵法计算船体总振动,上海船舶设计院,(1978).
[4]	薛惠钮,吴泽亮,应用迁移矩阵法计算舰船总体强迫振动,中国船舶研究中心舰船性能研究报告,(1979.1).
[5]	Hylarides,Recent developments in hull and shaft vibration analysis,I.S.P.Vol.17,No.190(1970).
[6]	Norris,C.and D.Catley,Application of two-dimensional finite elements model to ship vertical vibration and comparison with ship mobility measurements,Symposium on Propeller Induced Ship Vibration,Dec.(1979).
[7]	Kavlte,Dag and Absjord,Halvand,Prediction of vibration in the afterbody of ship,Norwegian Maritime Research,Vol.15 No.4,(1977).
[8]	Armand,J.and P.Orsero,Dynamic analysis of the afterbody of a ship-towards a successful correlation between analysis and experiment results,SNAME Ship Vibration Symposium,New York(1978).
[9]	Volocy,G.C.,M.Baudin and Morel,Integrated Treatment of Static and Vi-bratory Behaviour of Twin Screw 553000dwt Tankers,RINA London(1978).
[10]	Clough,R.W.,Analysis of structural vibrations and dynamic response,Recent Advances in Matrix Methods of Structural Analysis and Design(Papers Presented at the U.S.-Japan Siminar),Tokyo,Japan(1969).
[11]	Wilson,E.L.,A computer program for the dynamic analysis of underground structures,Report 68-1,Civil Engineering Department,University of California,Jan.(AD 832681,N.T.I.S.),(1968).
[12]	Clough,R.W.and C.A.Felippa,A refined quadrilateral element for analysis of plate bending,Proceedings of the Second Conference on Matrix Methods in Structural Mechanics,Oct.(AD 703685,N.T.I.S.),(1968).
[13]	Armand,J.L.and P.Orsero,Analytical identification of damping in ship vi-bration from full-scale measurement,RINA Symposium of Propeller Induced Ship Vibration,Dec.(1979).
[14]	钟万锯,林家浴,程耿东,田玉山,振动力学特征值问题的研究及其在构架式基础动力计算中心的应用,1978年大连计算力学会议论文.
[15]	Bathe,K.J.and E.L.Wilson,Numerical Methods in Finite Elements Analysis,Prentice-Hall,Inc.,Englewood Cliffs,New Jersey,(1976).
[16]	Cowper,G.R.,The shear coefficient in Timoshenko's beam theory,Journal of Applied Mechanics,Vol.33,No.2,(1966).
[17]	大连工学院编,《结构动力学》,(1978).