基于UG与ANSYS Workbench的齿轮箱体热-结构耦合分析研究

结合虚拟样机技术、有限元分析技术和热应力学理论,使用UG NX8.0建立齿轮箱体的虚拟样机模型。通过UG与ANSYS Workbench14.5的无缝链接,建立了齿轮箱体三维有限元模型;基于有限元理论对有限元模型进行热-结构耦合分析,得到齿轮箱体的温度场分布和热变形,确定了热应力和变形的集中部位,给出了影响温度场分布和热变形的因素。通过对有限元仿真结果分析表明,该热-结构耦合分析所建模型,可为复杂重载传动的发热量大工况下的齿轮箱体的结构设计、集成设计及热量均一优化设计提供可靠分析依据

一种漂浮铰接式波能装置的水动力学研究

A kind of hinged wave energy device with a floating body and a submerged body was studied. In order to get the hydrodynamic coefficient and wave excitation force of the device with complicated shape, the software HydroStar based on 3-D surface element me

Sediment Grain Size Characteristics and Transport Patterns in the Northwestern Shenzhen Bay,China

在深圳湾西北部海域进行表层沉积物取样,通过粒度分析获取沉积物粒度参数。结果表明,该海域中北部沉积物以粉砂为主,分选较差;局部有较粗的砂、砾沉积物分布,分选性差。地质统计分析结果显示,粒度参数半方差—距离的相关性与沉积物粒度参数的空间分布有关,剔除空间“异常“值后,可在半方差图中获取粒度参数的变程值,并将其作为粒径趋势模型的特征距离。粒径趋势分析表明,海湾西部海域的沉积物向东北净输运,深圳河口海域的沉积物偏西向输运,从而在海湾北部近岸海域形成一个沉积物汇聚中心,这与水动力观测结果基本吻合。此外,210Pb测年结果也表明,这个沉积物汇聚中心的沉积速率也相应较高,显示出较强的淤积趋势。Surface sediment samples were collected in the northwestern Shenzhen Bay,China,and then analyzed using by Mastersize 2000 and sieving to obtain grain size data.The results indicate that the silt sediment covers the North Bay with little poorly sorting and poorly sorted coarse sand and gravel in some areas.In order to use the grain size trends analysis model,the geostatistic method is used for the determination of characteristic distance.The geostatistic results are associated with the some "normal" or "abnormal" grain-size parameters in the study area.A variation range is remarkably determined after eliminating some "abnormal" values,which could be considered as the characteristic distance.The grain size trends analysis shows that sediment transport northeastwards in the west bay,and westwards in the Shenzhen River estuary area.Thus,the near shore area adjoining the north coast becomes a net sediment transport converge area.This pattern is highly consistent with the local hydrodynamics.Furthermore,210Pb dating result suggests that the sedimentation rate in this area is much higher than other area in the bay,which is consistent with the results of grain size trends analysis.国家自然科学基金(批准号:40576023);国家908专项(编号:908-02-03-08);教育部“新世纪优秀人才支持计划”(批准号:NCET-06-0446)共同资

Mechanism of water and suspended sediment transport in the Xiyang Channel along the southwestern Yellow Sea coast

基于2008年3月份在南黄海辐射沙脊群西洋水道内5个站位大潮期间的观测数据(包括流速与悬沙质量浓度的垂向剖面),利用机制分解法计算了西洋水道内的水与悬沙通量。结果表明,水体在多数时段内均处于分层向混合过渡的状态,中下层水体的理查德森数(rI)与瞬时悬沙输运量中的平均流输沙项及流速的潮周期变化相关项之间存在显著的负相关关系,表明水体的层化效应和混合程度对悬沙输运有重要影响。西洋水道内悬沙净输运率为10-1~100 kg/(M.S)量级,并以欧拉余流向岸输运为主,该结果揭示了苏北近岸潮滩在陆源物质供应减少背景下向海快速淤长的重要物质基础和水动力作用机制。Based on the sediment dynamics measurement of water levels,current velocities,and suspended sedi-ment concentrations at five stations in the Xiyang Channel along the southwestern coast of the Yellow Sea in March 2008,the water and the suspended sediment transport fluxes were calculated by the flux decomposition method.The results show that the water is in the transition from stratification to mixing during tidal cycles according to the Richardson number Ri.Moreover,a significant negative correlation is present between Ri and advection term(and the current velocity variations during tidal cycles).In addition,net transport rate of the suspended sediment is in the magnitude of 10?1--100 kg/(m.s).The suspended sediment transport is dominated by the Eulerian effect,towards the western coast,which plays an important role on the progradation of the adjoining tidal flats.国家自然科学基金(40576040;40876043

The environmental stability and the hazardous geology in seabed erosion and deposition of Jiaozhou bay

通过对胶州湾1936--2002年4期海图的地形对比和1986年、2007年2期lAndSAT-5TM影像的对比,分析了近70多年来胶州湾的冲淤灾害地质形势。根据胶州湾近百年来的沉积速率特征将其冲淤灾害形势划分为9类,结果表明:胶州湾在1936--1963年间总体呈现轻微淤积态势,但显浪—红岛连线以东区域(含沧口水道)以轻微侵蚀为主。与前期相比,胶州湾在1963--1982年间的淤积强度明显减弱,基本由轻微淤积转为冲淤平衡状态。该时期内沧口水道转为以较强淤积为主,大沽河水道和岛耳河水道处于大面积轻微侵蚀状态。胶州湾在1986--2007年间多数岸段向海显著淤长,岸线的平均淤进速率为101--102M/A;海床总体上呈轻微侵蚀状态。此外,根据对均衡态下潮汐汊道P-A关系的分析,胶州湾近70年来口门的潮流振幅和相应的等效摩阻系数都呈减小趋势,这表明胶州湾口门的不稳定性逐渐增加。Based upon the comparisons between underwater bathymetries digitized from nautical charts(1936—2002) and between coastlines derived from two landsat-5 TM images(1986—2007),the hazardous geology associated with erosion and deposition was analyzed for the past 70 years.During the last century,the sedimentary pattern was divided into nine types according to the depositional rates.The results show that the slight sedimentation happened as a whole in Jiaozhou bay from 1936 to 1963,while the slight erosion appeared in the eastern embayment(including Cangkou channel).Unlike before,the deposition obviously decreased from 1963 to 1982 and then the sedimentary environment transferred into the equilibrium.Besides,the strong sedimentation was dominant in Cangkou channel during this period.However,the Daguhe and Daoerhe channels were slightly eroded.Subsequently,most of coasts extended obviously towards the sea between 1986 and 2007;the average coastline extending rate was 101--102 m yr-1 and the slight erosion was observed on the seabed.Moreover,the analysis of tidal prism and cross-sectional area of tidal inlets shows that the current velocity amplitude and the corresponding equ-coefficient of friction had decreased over the past 70 years in Jiaozhou bay.This indicates that the entrance of Jiaozhou bay tended to be relatively instable.国家“九2八”(908-02-03-08);浙江省自然科学基金重点项目(ZS080241);国家自然科学基金项目(40776049

鳜鱼病毒病原及细胞感染特性的研究

在患暴发流行性发病鳜鱼的脾、肾、肝、鳃组织细胞的超薄切片中观察到直径为 12 0 150nm的二十面体病毒粒子 ,其截面呈六角形 ,有囊膜。将病鱼内脏与 10倍体积的PBS缓冲液制成组织匀浆液 ,过滤除菌后感染对数生长期的草鱼肾细胞。结果表明 ,该感染液在 2 8℃条件下 ,培养 36 4 8h ,生长旺盛的草鱼肾细胞开始出现CPE ,5 7d感染的单层细胞逐渐脱落死亡。该细胞病毒悬液具有感染性 ,可持续稳定地进行传代培养。感染细胞的病毒培养液 ,经差异离心纯化 ,负染制片 ,电镜下观察到大量的病毒粒