关于某高速艇前机舱主机振动原因分析

针对某高速艇前机舱左、右主机在试航中出现机体自身振动现象,发现前机舱底部横向结构采用隔档肋位布置,虽然减轻了结构重量,但忽略了主机基座构件横向刚性不足的问题。通过有限元计算分析,机舱底部横向隔档肋位的设计,需要在主机基座结构的几个关键点上予以特别加强。通过实船应用证明了这一结论,解决了主机在高速运转阶段出现的机体自身振动现象。     

调距桨桨毂机构与轴系系统的抗冲击有限元分析

针对某型调距桨桨毂机构建立有限元模型,考虑将瞬时冲击作用等效为静力载荷,以惯性力的形式施加于桨毂机构上,并基于模态叠加的思想,求解等效静力载荷,进而获得该阶次模态下桨毂机构各构件的应力响应结果,最终计算调距桨机构中螺栓连接件的等效冲击应力。     

XML6185客车空气弹簧座改进研究

应用有限元程序对XML6185客车进行静力学分析,对空气弹簧上盖板危险区域进行局部优化设计,并已应用于工程实际,收到良好效果。     

柴油发电机组U型基座振动模态分析

该文讨论柴油发电机组U型基座振动模态有限元计算方法和基本实现过程,并结合测试数据对计算结果进行了比较和分析。     

考虑冲压引起板厚变化的油底壳模态分析

针对油底壳冲压过程中板厚会发生变化的现象,采用显式有限元法模拟油底壳整个冲压成形过程,获得油底壳板厚变化信息,将板厚信息映射到隐式模型中进行模态分析。通过与不考虑板厚变化模态结果和实验模态对比发现,考虑冲压过程引起的板厚变化分析结果与实验结果相比,其误差在5%以内,比不考虑板厚变化的分析结果各阶固有频率误差平均减小50%左右。     

预制装配式箱涵的实用计算方法研究

预制装配式箱涵使用前景广阔,而实用计算方法研究相对滞后。通过土涵相互作用三维有限元模型分析,对传统平面框架模型在该类箱涵的应用效果进行检验,改进了传统模型,建立了实用计算方法。研究表明,该方法准确便捷,适合于工程设计使用。     

乘用车后碰撞安全模拟与结构设计研究

针对我国乘用车后碰撞燃油系统安全要求的强制性标准,研究了乘用车后碰撞安全的一般设计方法。通过某车型三厢改两厢的改型开发案例,利用有限元分析方法,分析验证了改型车的燃油系统安全性。从中总结了乘用车后碰撞安全结构设计的一些原则与要点。     

1400客/2000米客滚船的结构设计分析

  目的  客滚船是一种高技术、高附加值的船型。由于其结构的特殊性,目前各国船级社还未形成统一的有关客滚船屈曲和疲劳强度的计算规范。  方法  在充分分析客滚船结构特点的基础上,基于项目组自主研发的软件,依照挪威船级社（DNV）的客滚船屈服强度直接计算规范,并参考中国船级社（CCS）有关其他船型的相关规范,对某大型客滚船舱段进行屈曲强度、高级屈曲、热点疲劳3方面的直接计算,并详细介绍直接计算前处理设定方法,  结果  结果表明,目标舱段的屈曲强度、高级屈曲强度及疲劳强度的直接计算结果全部满足规范值。  结论  研究结果对大型客滚船的相关结构分析具有一定的参考价值。     

Development of simplified method for prediction of structural response of stiffened plates under explosion loads

During their lifetime, marine structures may be exposed to accidental loadings such as from collisions or explosions, as well as environmental loadings such as from slamming, sloshing and green water. Such loadings can cause damage to structures. Therefore, to minimize such damage, advanced and robust design guidelines should be formulated. Among those loads, in this study, explosions imparting an impulsive pressure loading containing a rapid increase in pressure and a short duration that can cause serious casualties, property losses, and marine pollution were considered. In this paper, a practical and robust method for damage assessment of marine structures exposed to explosion loads based on a single degree of freedom (SDOF) system and numerical simulations is proposed. The SDOF method was improved by introduction of new and better idealization resistance for the system and consideration of the effect of strain-rate, and subsequently was verified by a numerical method developed using the commercial ABAQUS software package. The numerical method was itself validated by comparison with relevant pulse pressure test data available in the open literature (good correlation was shown). Based on the validated numerical models, a rigorous parametric study of the structural response of stiffened plates having actual scantlings of offshore structures was performed. The numerically obtained maximum deformations were compared with the results from the improved SDOF method in a parametric study, and the variation of both methods was verified. Finally, simple yet accurate and reliable formulations for prediction of structural response were empirically derived. These formulations are expected to be usefully employed as a first-hand tool for prediction of damage extent of marine structures (including offshore structures) due to explosion loads.     

新型铁道双层集装箱运输车的车体结构优化

为了发展我国铁路双层集装箱运输 ,有关单位正在研究新型双层集装箱运输车。双层集装箱运输车车身长、载重大 ,车体的设计与制造需要更多的科学依据。现应用JIFEX软件对车体结构进行了多种工况有限元分析和总重、刚度、应力、自振频率多种条件下的优化设计 ,使车体结构设计更加合理、经济 ,为车体定型设计提供了科学依据