This article calculates the finite element modal using the different boundary condition of ccs , dnv , lr and gl , compares the calculation result with the permit stress to prove the safety of structure and then analyzes the results and comes to conclusion 在计算中，本文分别按照ccs 、 dnv 、 lr 、 gl的边界条件进行计算求解，将计算结果与ccs 、 dnv 、 lr 、 gl各自的强度标准进行比较，校核船舶结构强度是否满足要求。
Finally , a program system is developed in fortran language by using this simplified method to analyse the stability of grillage structure of deck . in comparison with fem method , this simplified method has engineering accuracy and can be used in the phase of design 本文编制开发了一套具有工程实用价值的船舶板架稳定性综合分析的计算程序，经计算及与有限元程序所得结果的比较，说明该程序简便、可靠，可方便地应用于船舶结构设计和强度校核。
But in calculation , they have difference . this article main purpose is to analyze the different boundary condition how to affect the stress result . this article first elaborates the ship structure direct calculation concrete methods and regulations of ccs , dnv , lr and gl 但是，各船级社进行直接计算时所采用的具体方法有所不同，本文主要研究ccs 、 dnv 、 lr 、 gl四家船级社在进行船舶结构强度直接计算时，各自采用不同的边界条件处理方法，对计算结果的影响。
In this paper we present in detail the process of midship section design and drawn procedure , coding shipping section plane cad application program through using microsoft visual c + + 6 . 0 , objectarx2000 programming languages and using grade optimistic method of optimization method . software design adopt windows attribute dialog box and common dialog box alternate designed means , people - computer interaction interface novelty , usableness 本文对船舶结构设计中的中横剖面设计和绘制程序进行了研究，利用autocad软件的二次开发功能，通过采用microsoftvisualc + + 6 . 0 、 objectarx2000编程语言和使用最优化方法中的分级优化方法，编制出了船舶剖面cad应用程序。
A template for ship structure strength calculating and analysis based on ansys is built . the system possesses the following features : 1 ) a method of parametric finite element analysis for ship structure is presented in this system , the fea model is droved by the parameters . 2 ) through proceeding communication mechanism of windows , the centre of control based on passages is formed 该计算系统将参数化技术引入船舶结构的有限元计算，初步实现了船体结构有限元建模、计算和后处理的全程参数化；借助功能强大的软件开发工具visualc + + ，利用windows的进程通信机制，建立了基于消息的控制中心，完成程序与ansys间的数据传递，实现了对ansys的封装，从而形成专业化、参数化的有限元计算系统。
Since the overall failure of a ship hull is normally governed by buckling and plastic collapse of the deck , bottom or sometimes the side shell stiffened panels , it is of crucial importance to accurately calculate the ultimate strength of stiffened panels in deck , bottom and side shell for more advanced structural design of ship structures 由于船体梁的总体破坏通常由甲板、底板或者舷侧加筋板的屈曲或塑性破坏控制，因此在船舶结构设计中准确地计算甲板、底板或舷侧加筋板的极限强度就显得尤为重要。
From this thesis , it can be stated that the use of observation implement and active cable can produce timely active control to ship in the wave . because active cable can enhance ship ' s ability of anti - siamming but do n ' t affect ship ' s inward capability , it should be given some attention in the application research of active control method in ship structure vibration by slamming 从本文中可以看出，将观测器和作动器相结合可以对航行于波浪中的船舶结构振动实施适时的主动控制，并且装上作动器不但不会影响船体本来的性能，而且可以增加其抗波浪砰击能力，因此主动控制方法在船舶结构砰击响应控制方面的应用和研究应该给予一定的重视。
Abstract : fatigue cracks in ship hull structures are most likely to occur in the highly stressed structural details . the conventional fatigue analysis is largely dependent on the determination of stress concentration factors ( scfs ) at the locations considered . this paper is concerned with the stress concentration of cutout in transverse web for longitudinal stiffener . a series of finite element models is carried out for the stress analysis of predefined structural details . the tabulated scfs of typical cutouts ( abs tanker rules ) in transverse web for longitudinal stiffeners are presented based on the finite element analysis ( fea ) results 文摘:疲劳裂纹往往发生在船舶结构的局部高应力区,而疲劳分析结果通常取决于任何准确确定结构的应力集中系数.本文研究为铺设纵骨而在舱壁板上开孔的应力集中,采用有限元方法对预先给定的结构进行应力分析,基于有限元计算结果给出了舱壁板典型开孔(参见abs油船规范)的应力集中系数表
For the increasing of ship dimensions and new type ship building , every ship ' s class society is searching for reasonable and reliable new design method . then ship structural direct calculation method comes to occur , and every ship ' s class society takes it into use . usually , direct calculation must be carried out for the bulkcarrier that the length is more than 190m or the structure is complex 由于船舶尺度的增大以及新船型的开发，世界各国的船级社都在寻找既先进科学又合理可靠的新的设计方法，于是出现了船舶结构强度直接计算法，并被各国船级社所广泛采用，一般都规定，对于船长190m或者结构形式复杂的散货船均要进行直接计算。
2 . considered the material intensity , girder area , panel thickness and loads as stochastic variables , taylor expansion sfem is adopted to analyze the influence of stochastic variables to the nodal displacement , and the different effects of the different variables to the same nodal displacement are compared . 3 以船舶结构中的材料的强度、梁元截面积、板元厚度和外载荷为随机变量，采用taylor展开的随机有限元，分析了随机变量对船舶结构的节点位移的定量的影响，同时还比较了不同的随机变量对同一节点位移的不同影响。
