液体化工品商业罐区配套码头工艺设计

我国液体化工品商业罐区的发展,要求配套码头的工艺设计更为合理,装卸货种更为广泛,操作更灵活。结合工程实际经验,归纳总结液体化工品商业罐区配套码头工艺流程设计、管道布置和材料选择的主要考虑要素,并给出典型的工艺流程和码头操作平台管道布置方式,为液体化工品码头的工艺设计者提供参考。     

船舶典型管路冲击动力响应和变形特性数值模拟方法及试验研究

根据船舶典型管路段按1∶10比例设计管路试验模型,冲击试验台上分别进行了不同管夹及支吊架的布置方式下的冲击试验,并对试验结果进行分析,给出典型管路系统冲击响应及变形特点,在此基础上采用时域法结合接触有限元建模技术,对试验模型管路在试验工况下的冲击响应、动态变形进行了数值模拟并与试验结果进行对比分析,结果表明:数值模拟结果的仿真精度较高同时可以很好的模拟管路系统的破坏形式和变形特点.     

斜拉索阻尼器减振效果检测技术研究

斜拉索由于其质量轻、阻尼小,极易在外界激励下产生各种振动,在拉索锚固端附近安装阻尼器以提高拉索的模态阻尼是目前使用最广泛的减振方法,因此阻尼器减振效果的检测评定对于保证桥梁运营安全非常重要。基于DASP系列软件平台测试了拉索阻尼,利用人工激振拉索至一定振幅后再测得的振动衰减的位移时程曲线,计算了拉索前三阶模态阻尼,该方法简单可靠,可以用来进行拉索减振器的功能评定。     

基于FORAN的船舶管路三维设计研究

为探索三维FORAN软件在船舶管路设计方面的应用,对管路建库、设计、出图、几何宏运用和几何宏编写等方面进行分析,探讨FORAN三维管路设计的方法和具体步骤,分析管路设计的关键技术。同时,结合标准参数,对三通旋塞的几何宏编写进行介绍。     

两侧减振器的刚度差异对压路机压实轮振动的影响

由于不合理的减振系统会导致振动压实轮两侧的振幅不一致,使压实轮发生偏振而造成压实后的路面不平整,为了减小这种偏振,通过对振动压路机机架和压实轮的振动过程进行数学建模,从动力学的角度探寻该问题的解决方法。     

柱式塔同向回转斜拉-悬索体系桥梁设计关键技术

安徽某跨江通道方案设计中,提出主桥采用主跨1620 m的斜拉-悬索协作体系桥梁。为解决该体系刚度低、主梁压力间断、边吊杆应力幅大等传统疑问,以及因不能设置辅助墩而引起的边跨刚度小、尾索应力幅高的特殊问题,设计采用单柱式桥塔、空间化悬索构建整体结构,并对结构的合理性、可行性进行理论和计算验证。设计针对体系形成的主要过程,提出边孔悬吊辅助跨构造,采用四索面斜拉索和空间双悬索四索面吊索。借助四索面拉吊融合方式在横向转换的便利、同向回转拉索对不对称布索的支持,使调整在更大空间内进行,实现两种体系更加平顺的融合。采用斜置阻尼约束系统使结构纵、横向动力性能满足规范要求。     

福州市淮安闽江大桥设计特色

介绍了在闽江分流点下游附近建设桥梁的孔跨布置的控制因素,结合桥位的建桥条件,因地制宜地采用钢箱混合梁斜拉桥,采用阻尼器减小地震响应,在大跨度斜拉桥钢梁上采用复合桥面技术以期提高桥面铺装的耐久性。     

Load-leveling suspension system with a magnetorheological damper

In this paper, a load-leveling suspension system with a magnetorheological (MR) damper is investigated. In this suspension system, the MR damper is connected to a spring to form a load-leveling suspension system. The system effective stiffness and damping can be adjusted by controlling the MR damper. The characteristics of a load-leveling suspension system are studied first. When the linear damper is replaced with an MR damper, the averaging method is adopted to obtain the steady-state response of the nonlinear system. A comparison demonstrates that the results of the averaging method are in good agreement with those obtained by numerical simulations. The analytical results are then verified experimentally. The load-leveling suspension system studied here is able to adjust both suspension stiffness and damping and, hence, it may provide more effective vibration control in a wider frequency range, when the damper is controlled.     

Axial vibrations of a propulsion system taking into account the couplings and the boundary conditions

Calculations of the axial vibrations of a marine power transmission system are a very difficult problem owing to the complicated couplings and difficulties in determining the boundary conditions. The torsional–bending–axial coupling action of the system should be accounted for when considering its dynamics. A determination of the mutual interference of system vibrations and their boundary conditions is also necessary. A performance analysis of the main engine bearings, the thrust bearings, and the axial dampers should also be carried out. Thus, the effects of additional bending stresses in the crankshaft and possible vibrations of the ships structure due to the reaction force in the thrust bearings should be considered. I have devised a computer program to analyse the axial vibration problem. The numerical analysis method presented is compared with measurements (performed on real ships) and verified by them.     

大跨径斜拉桥结构体系研究

随着桥梁设计及施工技术的不断发展,斜拉桥主跨跨径目前已达到千米级,选择怎样的结构体系已成为设计者必须面对的一个关键问题。文中介绍了大跨径斜拉桥结构体系的几种形式,并结合主跨为730 m的双塔钢箱梁斜拉桥结构体系,介绍了分析过程和比较结果。