我国船用低速大功率柴油机曲轴制造技术的发展

分析了我国造船快速发展对船用低速大功率柴油机曲轴的需求,确定了船用半组合式曲轴开发的必要性,回顾了上海船用曲轴有限公司开发船用曲轴制造技术的过程与经历,并对行业前景作了展望。     

Dynamic plastic response of clamped stiffened plates with large deflection

Study on the dynamic response, and especially the nonlinear dynamic response of stiffened plates is complicated by their discontinuity and inhomogeneity. The finite element method （FEM） and the finite strip method are usually adopted in their analysis. Although many useful conclusions have been obtained, the computational cost is enormous. Based on some assumptions, the dynamic plastic response of clamped stiffened plates with large deflections was theoretically investigated herein by a singly symmetric beam model. Firstly, the deflection conditions that a plastic string must satisfy were obtained by the linearized moment-axial force interaction curve for singly symmetric cross sections and the associated plastic flow rule. Secondly, the possible motion mechanisms of the beam under different load intensity were analysed in detail. For structures with plastic deformations, a simplified method was then given that the arbitrary impact load can be replaced equivalently by a rectangular pulse. Finally, to confirm the validity of the proposed method, the dynamic plastic response of a one-way stiffened plate with four fully clamped edges was calculated. The theoretical results were in good agreement with those of FEM. It indicates that the present calculation model is easy and feasible, and the equivalent substitution of load almost has no influence on the final deflection.     

基于有限元强度计算的MAN汽缸套损坏问题的分析与研究

根据MAN汽缸套损坏情况,提出了采用有限元方法对汽缸套热负荷和机械负荷进行强度计算分析,并研究探讨了几项改进措施。     

削斜筋板架的抗屈曲能力研究

根据CSR高级屈曲分析方法,运用有限元软件ABAQUS,研究削斜筋板架的屈曲能力,计算了5筋板架、小削斜筋板架、削斜筋板架以及4筋板架的屈服强度以及极限强度。结果表明：加强筋削斜后,加筋板屈服强度的下降比极限强度更明显;在纵向载荷条件下,承载能力随着加强筋的削斜而降低,而在横向载荷条件下,其极限强度没有明显下降。     

305×254旋压密封式制动缸研制

介绍了305×254旋压密封式制动缸的分类和特点,对冲压活塞和推杆回复装置进行了分析,并对研制过程中的试验进行了简要论述.     

客车单元制动缸检测系统的应用研究

针对当前国内客车单元制动缸检测试验过程中存在的问题,研究设计了一种客车单元制动缸通用检测系统,能够同时对4路不同型号单元制动缸进行性能试验。着重介绍了该检测系统的设计、功能以及测试结果分析。     

计入冷却液时汽缸套振动特性和穴蚀的研究

研究了计人冷却液时汽缸套穴蚀计算的模型;探讨了在任意力作用下的动力响应计算中,用杜哈曼积分求解解耦方程的问题,以12V180和16V240柴油机为例,按不同约束情况进行了振动计算和分析。     

柴油机汽缸套穴蚀和振动特性的研究

以12V180型柴油机的汽缸套为例,用有限元法对该缸套进行了动力分析,并对引起缸套振动的活塞冲击力的处理进行了探索性的研究。本文从研究缸套计算模型的建立入手,对不同疏密程度网格的计算精度进行了比较,最后选定了144个节点的缸套计算模型作为进一步分析的基础;对不同壁厚、不同支承刚度、不同O型密封圈刚度和O型密封圈不同位置等多种因素的变化对缸套振动特性的影响分别进行了研究,为今后柴油机汽缸套的设计提供了一定的理论依据。     

500 t半圆体与箱筒预制场的改扩建

原200t半圆体预制场已不能满足大型半圆体和箱筒的生产要求。通过对场地的整体规划设计、改造,使整个场地得到了有效的利用,满足500t半圆体和混凝土箱筒的预制及出运,优化了工艺,提高了效益。     

Two-dimensional FEM model of Vortex-Induced Vibration of A Circular Cylinder

The finite element method was employed to solve the N-S equation.Incorporated with the vibration equa- tion,the vortex-induced vibration of the circular cylinder is studied by an Arbitrary-Lagrangian-Eulerian(ALE)al- gorithm.The Reynolds number based on the cylinder diameter and the undisturbed flow velocity ranges from 90 to 150. The motion of the cylinder was modeled by a spring-damper-mass system.The numerical model has been validated by comparison with the experimental data in literature.The"lock-in"and"beating"phenomena were successfully repro- duced in the numerical test.