桥壳结合面接触非线性有限元分析

本文采用接触非线性有限元技术,通过建立桥壳、主减速器壳、螺栓组有限元模型,在螺栓预紧力与结合面之间的相互关系影响下,分析在三种载荷工况下,桥壳与主减速器壳结合面之间的接触压力分布情况,并能得到应变最大的区域,找出易漏油区,对产品设计及以后的改善提供了可靠的依据。     

基于仿生的非光滑表面防污减阻技术发展现状分析

基于船舶防污减阻的必要性,从仿生角度出发,介绍了仿生表面防污减阻这种新型环境友好型防污方法。重点分析了鲨鱼、海豚、贝壳和甲鱼壳等仿生原型的表面微结构,探索了这些生物表面微结构的防污减阻机理。基于生物表面微结构的防污减阻效应,阐述了现有的水生生物非光滑表面防污减阻技术,最后对仿生表面防污减阻方法进行了展望。     

某重型载货车中冷器散热性能改进设计

本文针对某重型载货车中冷器散热能力不足的问题,提出了改进方案,改进散热片结构、改变紊流片尺寸及增加中冷器与水箱之间密封,并通过多种验证方式进行验证,从验证结果看,改进效果较明显,为以后中冷器散热能力的改进提出了参考。     

Effect of Fluid-Structure Interaction on Sealed Flow Field and Leakage Rate Based on Computational Fluid Dynamics

This paper addresses the issue of reciprocating compressors staggered labyrinth seal structure. The internal flow field of sealed structure, the displacement of cylinder and piston for different tooth profile angles are analyzed synchronously using FLUENT software, and the effects of fluid-structure interaction on the performance of the labyrinth seal are revealed. The results indicate that with the growth of tooth profile angle, the leakage rate of labyrinth seal tends to decrease first, and then increase. The results of fluid-structure interaction analysis are close to those of actual engineering. The effect of fluid-structure interaction makes tiny deformation in calculation mesh of piston and cylinder structure, and the coupling interaction affects the performance of the labyrinth seal.     

犁削技术与微结构加工

介绍犁削加工方法及刀具设备的研究进展情况,包括挤压-犁切、滚压-犁切、劈切-挤压。它们在微结构加工方面有独特优势。     

同步碎石封层组成设计方法研究

在对国内外同步碎石封层组成设计方法进行总结分析的基础上,提出了碎石用量和沥青用量设计方法,并结合实体工程应用验证了设计方法的可行性和合理性,可为同类工程提供参考。     

压力仪表在潜艇上的应用分析

从压力仪表在使用中出现的主要问题入手，结合其发展现状，分析了压力仪表在潜艇上的应用，仔细讨论了仪表供货过程中存在的一些问题，并提出了改进措施。同时，对铅封问题也做了一些说明。     

雾封层技术在低温施工沥青路面中的应用

针对低温施工沥青路面可能产生的水损坏状况,文章提出一种解决方案——雾封层技术。介绍了雾封层的定义及原理,并结合工程应用提出了雾封层施工中需要注意的问题。通过施工前后的对比分析,确定雾封层对沥青路面抗水性能的提高有显著效果。     

纤维稀桨封层技术在沥青路面层养护中的应用

该文分析了稀浆封层的材料要求、条件的选择与室内实验。通过稀浆封层在湖南省长沙市境内沥青路面的某三级公路养护中的运用,阐述了稀浆封层技术的工艺流程及施工注意事项,竣工观测情况,提出了稀浆封层适宜在道路养护中的应用。     

Measurement of ocean temperatures using instruments carried by Antarctic fur seals

The study aimed to test the utility of instruments deployed on marine mammals for measuring physical oceanographic variation and, using this method, to examine temperature variation in the coastal waters around South Georgia. There was a significant correlation between temperature measurements made using a towed undulating oceanographic recorder (UOR) and concurrent measurements from time-depth recorders (TDRs) fitted to lactating Antarctic fur seals foraging from the coast of South Georgia. Congruence was found at horizontal spatial scales from 0.01°×0.01° to 0.5°×0.5° (degrees of latitude and longitude), and at a vertical scale of 10 m. However, there was no significant correlation between temperature measured by TDRs in the top 5 m and sea surface temperature (SST) measured by satellite remote sensing. TDR data provided information about temperature variation vertically through the water column, and through time. The UOR data were used to recalibrate the TDR data in order to correct for the slow response time of the TDR thermistor relative to the speed of seal movements through the water column. Seasonal temperature variation was apparent, and temperatures also varied between regions, and with bathymetry. These results were consistent with the current interpretation of the coastal oceanography around South Georgia. In particular, the relationship between on- and off-shelf waters showed larger amounts of warmer surface water in a region in which more run-off was to be expected. The study also showed that Antarctic fur seals concentrate their activity in regions of colder, and presumably oceanic, water. Such instrumented animals could provide near real time data for assimilation into ocean models.