PLC在NF-6风洞风机控制系统中的应用

介绍了PLC在西北工业大学NF-6风洞风机自动控制系统中应用，阐述了系统的构成及相应的功能，并着重介绍了防喘振和流量控制2个重要控制回路。     

驻极体麦克质量检测中图像信号背景去噪研究

小波图像去噪已经成为目前图像去噪的主要方法之一,介绍了基于小波变换系数门限值的去噪方法,并给出了4种不同的门限值确定规则,针对含有白噪声的驻极体麦克图像信号,通过选择合适的小波基和阈值进行去噪,取得了相对中值滤波和均值滤波更好的效果.     

GC/MS分析中药蚂蟥脂肪酸的组成

采用GC/MS法分析了中药蚂蟥脂肪酸的组成，鉴定了19个组分，其中不饱和脂肪酸占71．84％，饱和脂肪酸占20．71％。     

Fatigue properties of fine grained magnesium alloys after severe plastic deformation

Fine grained AZ31 and AZ61 magnesium alloys produced by equal channel angular pressing (ECAP) were tested for investigating tensile and fatigue properties, including microstructure, monotonic tensile flow, fatigue life and crack growth rate. For the two alloys, the yield stress of the ECAPed sample was lower than that of the unECAPed (=as received) sample, because of the fact that the softening effect due to texture anisotropy overwhelmed the strengthening effect due to grain refinement. Grain refinement of the AZ31 and AZ61 alloys through ECAP was found not to be significantly effective in increasing fatigue strength.     

GICL型鼓形齿联轴器的研制

分析了国内外鼓形齿式联轴器技术的发展和特点,介绍了GICL型鼓形齿式联轴器的研制过程.     

Observability analysis of alignment errors in GPS/INS

Misalignment can be an important problem in the integration of GPS/INS. Observability analysis of the alignment errors in the integration of low-grade inertial sensors and multiantenna GPS is presented in this paper. A control-theoretic approach is adopted to study the observability of time-varying error dynamics models. The relationship between vehicle motions and the observability of the errors in the lever arm and relative attitude between GPS antenna array and IMU is given. It is shown that alignment errors can be made observable through maneuvering. The change of acceleration makes the components of the relative attitude error that are orthogonal to the direction of the acceleration change observable. The change of angular velocity makes the components of the lever arm error that are orthogonal to the direction of the angular velocity observable. The motion of constant angular velocity has no influence on the estimation of the lever arm.     

LNG汽车加气站的消防设计方案

阐述LNG汽车加气站的一般规模及构成,分析LNG汽车加气站与LPG汽车加气站、LNG气化站在气源的特性、厂站的建设规模等方面的差异,根据相关现行的国内、外设计规范,探讨LNG汽车加气站消防设计方案。     

武汉火车站三跨连续刚构拱桥模板体系设计

武汉火车站是国内第一个采用桥建合一的高速铁路客运专线火车站.站房由10座高架桥平行布置组成.其中三跨连续刚构拱桥为单箱五室箱形截面,桥面呈槽形,底部为鱼腹式.混凝土外观质量要求为清水饰面混凝土.结合桥梁施工方案进行模板及其支撑体系的研究,提出安全、可靠、高效的模板体系设计方案.     

上海虹桥综合交通枢纽西航站楼三角形屋架预应力施工技术

上海虹桥国际机场是我国三大枢纽机场之一,该扩建工程西航站楼部分屋面采用预应力张弦结构。结合工程实际,着重论述了部分结构的预应力施工,并结合施工仿真和现场实测,提出了此类结构的预应力施工技术的关键。     

基于和分解有限变形力学理论的深部软岩巷道开挖大变形数值模拟分析

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HE M C,GONG W L,LI D J,et al.Physical modeling of failure process of the excavation in horizontal strata based on IR thermography[J].Mining Science and Technology,2009,19(6):689-698.

WANG J X,LIN M Y,TIAN D X,et al.Deformation characteristics of surrounding rock of broken and soft rock roadway[J].Mining Science and Technology,2009,19(2):205-209.

GAO M S,DOU L M,XIE Y S,et al.Latest progress on study of stability control of roadway surrounding rocks subjected to rock burst[C]// Proceedings of the 6th International Conference on Mining Science and Technology.Leiden:Procedia Earth and Planetary Science,2009:409-413.

CHEN Z H,WANG W Q,ZHANG L W.FEM analyses of stress and deformation of a flexible inner pressure bolt[J].Journal of China University of Mining and Technology,2008,18(4):584-587.

WANG L G,MIAO X X.Numerical simulation of coal floor fault activation influenced by mining[J].Journal of China University of Mining and Technology,2006,16(4):385-388.

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陈新,郭宏云,何满潮,等.深部高应力巷道的非对称大变形[J].黑龙江科技学院学报,2007,17(6):415-419.(CHEN Xin,GUO Hongyun,HE Manchao,et al.Asymmetric large deformation of deep roadway with high in-situ stress[J].Journal of Heilongjiang Institute of Science and Technology,2007,17(6):415-419.(in Chinese))

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