【作者】 钱振华；

【导师】 华宏星；

【作者基本信息】 上海交通大学 ， 机械设计与理论， 2010， 硕士

【摘要】 潜艇低速航行时,潜艇主辅机的振动是主要的噪声源,其振动通过隔振系统传递到艇体。由于包含隔振系统的实际潜艇结构的复杂性,常规的有限元分析和实验测试成本高、周期长,并且难以在初步设计阶段应用,因此希望建立一种简单有效的方法估算包含隔振系统的带基座圆柱壳体的振动特性。围绕这个目的,本文完成了以下几个方面的工作:1、推导了基于Rayleigh-Ritz原理的高阶平板壳单元和基于有限条法的平板壳单元,比较了高阶元和有限条元在平板、折叠板和带基座壳体的振动分析中的性能,数值算例表明高阶元和有限条元具有很高的精度和收敛速度。2、推导了基于解析试函数的广义协调四边形膜单元和板单元,并用上述两种单元组合成基于解析试函数的广义协调四边形平板壳单元,用双参数法证明了基于解析试函数的广义协调四边形板单元对于中厚板求解问题的解的唯一性和收敛性。数值算例表明基于解析试函数的广义协调四边形平板壳单元比其它同类单元具有更高的精度和计算效率。3、在BLZPACK、FEAST和PARDISO软件包的基础上,用Fortran语言,分别开发了利用分块Lanczos法和基于量子力学密度矩阵的围线积分方法计算特征值的并行程序。数值算例表明这两种方法具有准确和高效的特点。同时,对不同规模的数值算例的计算时间进行比较,初步验证了并行程序的计算效率。4、利用频响函数综合法对内部带有典型浮筏隔振系统的带基座圆柱壳体结构进行建模,并对一个双机组的浮筏隔振系统进行计算,对圆柱壳体结构的基座连接点处的位移和输入到基座上的力进行比较,结果表明频响函数综合具有很好的精度。这为带有复杂内部结构的圆柱壳体结构的振动分析提供了一套思路。5、为了验证频响函数综合法采用实验频响函数数据进行综合的合理性,对一含有内部单层隔振系统的带基座圆柱壳体结构进行了实验研究,其中内部单层隔振系统的振源为加筋板结构,其频响函数由实验测得,带基座的圆柱壳结构采用在前述章节中的有限元单元进行建模得到,结果表明利用含有噪声污染的实验数据进行综合时,频响函数综合法仍然具有一定的精度。这表明频响函数综合法可以方便地处理实验频响函数数据和理论频响函数数据的综合,具有广泛的工程应用前景。更多还原

【Abstract】 Low-speed submarine voyage, the submarine noise generated by the machine running, about the overall sound level of 70% of the radiation。These noise which is made by vibration from raft isolation system to pass through to the cylinder. As the real raft isolation system in the submarine is complexed, testing is difficult. We need a convenient estimate method which included with the base isolation system, including the vibration characteristics of cylindrical shell . Around this purpose, this completed the following tasks:1、derived based on the high-order Rayleigh-Ritz principle of shell element and finite strip shell element , compared these elements with the flat, folded plates and shells by the vibration analysis of the performance of numerical examples, and it shows that higher-order element and finite strip element with high accuracy and convergence speed.2、obtained analytic trial function based on the generalized conforming quadrilateral membrane element and plate element, and use the above-mentioned two element based on the assembled of analytical trial function of the generalized conforming quadrilateral flat-type shell element, with the two-parameter method to prove analytic trial function based on the generalized quadrilateral plate element for coordination of the fourth-order plate solution for solving the problem of uniqueness and convergence. The numerical example shows that the present quadrilateral shell element is better than other similar shell elements with higher accuracy and computational efficiency.3、BLZPACK, FEAST, and PARDISO packages, based on the Fortran language, each has developed block-Lanczos method and the use of quantum mechanics, density matrix based on the tube line integral method of calculating the finite element eigenvalue parallel programs. The numerical examples show that these two methods with the accurate and efficient characteristics. At the same time, the finite element program for parallel programs to compare the calculation time of the initial validation of the computational efficiency of parallel programs.4、the use of frequency response function synthesis method with a typical internal floating raft isolation system with a base of cylindrical shell structure of the model, and a two-unit floating raft isolation system calculated on the cylindrical shell structure of base connection points of the displacement and entered into force on the base of comparison, results showed that the frequency response function is integrated with good accuracy.5、in order to verify frequency response function synthesis method for the experimental frequency response function of the correctness of data integration on a single-layer vibration isolation system with internal cylindrical shell structure with a base of experimental study, in which the internal single-layer vibration isolation system the source for the stiffened plate structure, and its frequency response function is measured by the experiment, with the base of the cylindrical structure used in the preceding chapters of the finite element model unit available, experimental results show that the use of experimental data containing noise pollution in a comprehensive, the frequency response function synthesis still has a certain degree of accuracy. This shows that the frequency response function synthesis method can easily deal with experimental data and theoretical frequency response function, frequency response function data, integrated with a wide range of engineering application prospects.更多还原