基于仿真的全柴联合动力装置特殊工作制联控曲线研究

针对全柴联合动力装置单轴工作制和三机工作制相应的联控曲线以保证推进性能综合最优的需求,运用计算机仿真方法对某全柴联合动力装置的单轴工作制和三机工作制的联控曲线进行研究。首先,建立推进系统各部件的数学模型并将它们集成为整个推进系统的数学模型。基于这些数学模型和仿真计算,运用"船—机—桨"匹配原理提出特殊工作制联控曲线的一般设计原则,经实船使用,证明所设计的联控曲线能有效实现原设计目的。     

稳定土厂拌设备水泥计量系统的改进

由于稳定土厂拌设备水泥计量系统的计量精度对所生产的混合料的质量起着重要的作用,故根据厂拌设备的计量原理,对现有的计量系统结构进行改进。新结构应用于稳定土厂拌设备中,使用结果表明水泥计量精度得到提高。     

超大型半地下污水处理厂基坑设计与分析

以上海市某半地下式污水处理厂超大基坑为例,分析了此类基坑设计的特点与难点,详细介绍了基坑围护结构选型,基坑设计方案,包括围护桩(墙)选型,支撑选型,分区实施等措施,并分析了该工程基坑设计的关键技术,可供今后软土地区类似深大基坑设计借鉴和参考。     

Spatio-temporal variations in deep-sea demersal communities off the Balearic Islands (western Mediterranean)

The spatial and temporal variations of deep-sea megafaunal assemblages from the western Mediterranean are analysed in the present paper. The assemblages from two locations of the Balearic Islands situated 120 km apart were compared using data collected seasonally on a bathymetric stratum covering the 150–750 m depth range during six bottom-trawl surveys. The assemblage structure, in terms of species composition, species dominance and population sizes, was differentially affected by the spatio-temporal variables analysed (depth, location and fishing period). Although depth was the main factor determining the assemblage composition, the differences obtained between the two locations were also relevant. On the upper slope these between-location differences in the dynamics of megafaunal assemblages were found to be related to the effect of fishing exploitation. Population size-based metrics and biomass spectra were good predictors of meso-scale fishing effects, and were mainly reflected by elasmobranchs and demersal teleosts. Nevertheless, the effects of fishing depended on the species considered. Two dominant large-sized fish species found on the upper slope in both localities, Galeus melastomus and Phycis blennoides, had higher biomass values associated with lower fishing effort. Although the mean body weight (MBW) of both species and also the mean maximum body weight (MMBW) of G. melastomus agreed with this pattern, the P. blennoides MMBW did not. This last case could be indicative of natural size-trends such as the bigger–deeper phenomenon which refers to the displacement of large individuals towards the deeper limit of their bathymetric distribution, beyond the maximum depth sampled in this study for this species. By contrast, the target species of the upper slope fishery, the red shrimp Aristeus antennatus, was not negatively affected by the direct impact of fishing activity and other environmental factors, such as the presence of specific water masses could also be important.     

船舶核动力装置一回路小破口失水事故处置规程研究

利用建模仿真的方法,对船舶核动力装置一回路系统发生无法隔离的小破口失水事故进行研究。结果表明,只要采用正确的运行方案,可以在保证主冷却剂泵不受汽蚀影响的条件下,利用主冷却剂泵的低速运行,排出衰变热,使系统压力较快地降低到低压安全注射系统投入运行的压力,有效地保证反应堆安全。     

石南大桥旧桥加宽与改造

随着交通量的日益增多，位于佛山境内的石南大桥旧桥宽度已不能满足交通需要，但检测其结构，健康状况良好，为此需对旧桥进行加宽改造。文中针对旧桥的具体情况进行了加宽与改造，并对施工中的注意事项进行了阐述。     

稳定土厂拌设备的动态标定分析

稳定土厂拌设备在生产前需要对计量装置进行动态标定。根据稳定土厂拌设备的计量原理,在工程实践的基础上提出了一种行之有效的动态标定稳定土厂拌设备的方法,同时对准备工作和动态标定过程中应注意的问题也作了具体说明。经动态标定的稳定土厂拌设备有利于操作员直观、方便地了解机器的运行情况以及成品料质量的好坏。     

舰船燃气和蒸汽动力装置的发展与展望

通过二个典型机型及其有关资料的介绍,论述了舰船燃气及蒸汽动力装置的现状与发展趋势。     

间歇式沥青混合料搅拌设备振动筛筛网配置研究

应用物料筛分概率理论,研究了间歇式沥青混合料搅拌设备中振动筛筛网配置对筛分效率的影响,提出了筛分效率和筛孔尺寸的关系模型,根据模型建立了配筛优化函数并给出了求解流程.通过在实际施工中的应用表明,该方法对沥青搅拌设备配筛十分有效.     

沥青混合料搅拌设备风压系统计算

风压系统压力、风量的研究对提高搅拌设备工作可靠性及降低运行成本至关重要.针对沥青混合料搅拌设备风压系统进行了分析,并给出了风量、风压的计算过程及公式,为风机的选择提供了依据.