邮轮大尺度薄板分段翻身专用装置设计

针对大尺度薄板分段刚性较弱的问题,分析薄板翻身的工艺,利用有限元方法分析翻身装置本体及吊梁在各种工况下的强度,结合邮轮薄板分段的结构特征,设计翻身专业装置的垫块和限位器.     

水翼船机动操作特征探讨

水翼船以其独特的翼航技术,在安全、高速、舒适和增效方面优势明显。本文探讨了水翼船的掉头、靠离泊操作特征,旨在提高水翼船实际操作安全性。     

某型城市客车转向过渡臂支架断裂有限元分析

利用有限元分析方向，对某型城市客车转向过渡臂支架断裂原因进行了有限元计算，对结果进行了分析讨论，找出了问题所在，并对改进方法进行了对比计算，从而给出了切实可行的改进方法和进一步的建议。     

G109宁夏路段交通事故肇事驾驶员特性分析

根据109国道石嘴山-中宁段交通事故资料,对该路段驾驶员年龄、交通方式等进行了分析,得出了109国道肇事驾驶员的基本特性。     

烟囱热排烟对舰船甲板风下洗影响的大涡模拟

采用低速气流运动控制方程组和湍流大涡模拟方法,研究迎面来风条件下、烟囱热排烟对舰船甲板风下洗气流的影响,得到舰船飞行甲板上空下洗与航向、横向速度随时间的变化。较无热烟气排出,热排烟使飞行甲板上方的下洗速度时均值减小,其脉动幅度增加;飞行甲板上距离机库门相同的位置上,越靠近首尾对称面,热排烟对下洗速度的影响越大;越靠近舰尾区域,热排烟对飞行甲板风下洗速度的影响越小。     

道路交叉上跨与下穿方案比较

两条或两条以上道路交叉,当采用分离式立交处理时,应根据所处地形或各条道路类型等情况,将各自相对独立的道路作为一个整体综合考虑,合理采用上跨或下穿方案,确定相互位置关系。     

斗式提升机带载启动困难原因分析及解决措施

斗式提升机普遍存在带载启动困难的问题,极需解决。分析斗式提升机带载启动困难的原因,提出通过局部改进以解决带载启动难的问题。改革取得良好效果。     

甲板部船员接新船应注意的问题及对策

船员的接新船工作质量好坏,直接影响到船东的利益和将来船上工作是否能顺利开展。接船是一项复杂艰巨的任务,在这个过程中需要学习注意的事项很多,本文就甲板部船员在接新船中对自己所负责的事务作出陈述,并且就自己在船上遇到的问题给予解决的办法,为甲板部船员接新船提供建议。     

Investigation of the shear flows over a sunroof opening based on a linear inviscid instability analysis

The large-scale shear flows over the sunroof opening of a mid-sized SUV measured using a PIV system were investigated. The shear flows were measured for five different cases of deflector protrusion (one case was the baseline test without deflector) at two different free stream flow velocities below the critical velocity where the buffeting noise level reached a maximum. The structures of the shear flows were observed to differ, apparently depending on whether the radiated buffeting noise is relatively strong or not. For strongly buffeting experimental cases, the momentum thicknesses of the shear layers were observed to grow rapidly and saturated at a station near the downstream edge of the sunroof opening, where the saturation of the transverse velocity fluctuations was also observed, and where the vortex coalescence process was presumably completed. On the other hand, no discrete large-scale vortex structures were observed for none-buffeting or weakly buffeting cases. Streamwise growth of the velocity fluctuations was found to be well predicted by a linear hydrodynamic instability analysis for the strongly buffeting cases. Numerical results obtained from a linear inviscid instability analysis using a hyperbolic tangent mean velocity profile were used to calculate the amplification factors with the initial momentum thickness and the streamwise fluctuation wavenumber. The shear flows were found to form large-scale discrete vortices when the linear inviscid amplification factors exceeded a threshold amplification factor.     

使用推倒分析方法进行桥梁抗震性能评价

论述了开展桥梁抗震性能评价的必要性,对目前国内外用于抗震性能评价的方法进行了简单介绍,并对应用广泛的推倒分析方法的原理和实施细节问题进行了讨论,最后给出了一个推倒分析算例.