双壁钢围堰在山区河流桥梁基础中的应用

结合资水大桥施工,介绍在山区河流桥梁基础中圆形双壁钢围堰的设计,双壁钢围堰岸上定点牵引入水、浮运和精确定位施工,钢围堰水下混凝土封底及基坑爆破开挖施工。     

Simulation of the Interaction between Vehicle Wheel and the Unevenness of Road Surface

A model of the relationship between a vehicle wheel and the unevenness of the road surface is defined. The wheel is considered to be of circular shape. For a given form of unevenness, the excitation functions are evaluated for the individual subsystems of the dynamic vehicle model having 5 degrees of freedom. The vehicle model traverses the uneven surface at a variable velocity. The model provides for the study of the complex dynamic phenomena which occur between the wheel and the unevenness. The response of the model also includes the dynamic stress on the drive when the wheel passes over the unevenness of the road surface.     

Predictive Model for Corrosion Rate of Oil Tubes in CO_2/H_2S Coexistent Environment Part Ⅰ: Building of Model

Introduction　　Sincethecorrosionofoiltubesinbrinesolutionscontainingcarbondioxide (CO2 )andhydrogensulfide(H2 S)gasesisasevereprobleminengineering ,itisveryurgenttobuildapredictivemodelofthecorrosionrate(rcorr)foroiltubesinCO2 /H2 Scoexistentenvironment …     

VFT PHASE VOLTAGE MEASUREMENT IN THREE-PHASE ENCLOSED GIS

Ｇａｓｉｎｓｕｌａｔｅｄｓｕｂｓｔａｔｉｏｎ (ＧＩＳ)ｈａｖｅｂｅｅｎｕｓｅｄｉｎａｗｉｄｅｒａｎｇｅｏｆｖｏｌｔａｇｅｌｅｖｅｌｆｒｏｍ 12 3ｋＶｔｏ765ｋＶｏｒａｂｏｖｅ .Ａｓｖｏｌｔａｇｅｌｅｖｅｌｓｅｘｃｅｅｄ 30 0ｋＶ ,ｆａｉｌｕｒｅｓｃａｕｓｅｄｂｙｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｔｒａｎｓｉｅｎｔｐｈｅｎｏｍ ｅｎａｂｅｇｉｎｔｏａｐｐｅａｒ .Ｔｈｅｓｅｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｔｒａｎ ｓｉｅｎｔｓａｒｅｃａｕｓｅｄｂｙｄｉｓｃｏｎｎｅｃｔｓｗｉｔｃｈｉｎｇｉｎｔｈｅＧＩＳ .Ｔｈｉｓ…     

Monitoring Crustal Deformations with Radar Interferometry： A Review

The crustal movements, probably motivating earthquakes, are considered as one of the main geodynamic sources. The quantitative measurements of ground surface deformations are vital for studying mechanisms of the buried faults or even estimating earthquake potential. A new space-geodetic technology, synthetic aperture radar interferometry (InSAR), can be applied to detect such large-area deformations, and has demonstrated some prominent advantages. This paper reviews the capacity and limitations of InSAR, and summarises the existing applications including some of our results in studying the earthquake-related crustal motions.Finally it gives the outlook for the future development of InSAR.     

结点水准网平差及精度评定的统计功能实现

指出结点水准网等权替代法进行平差计算的理论依据为序贯平差，在分析结点水准网序贯平差特点的基础上，给出了其逐次平差和精度评定的实现步骤。剖析了计算器中固化统计功能程序的实质，扩展了其应用范围，给出了在实数权情况下各统计功能的含义，结点水准网平差统计功能实现的方法，并通过算例进行了验证。     

拉萨柳梧大桥抗震性能研究

复式钢箱提篮拱是一种新型的桥梁结构形式，以拉萨柳梧大桥为例主要介绍了该桥型的受力特点、动力特性及其在地震作用下的反应特性。复式钢箱提篮拱桥面系在横桥向地震作用下横向位移量较大，不同方向地震作用下，主副拱内力响应不同，主桥拱肋有较好的整体性及抗震性能。     

A NEW GENERATING METHOD FOR THE MACHINING OF A CYLINDRICALGEAR WITH SYMMETRIC ARCUATE TOOTH TRACE

Objective To introduce a new generating method for the machining of a cylindrical gear with symmetric arcuate tooth trace. Methods Adopting this method, the key problems of mismatch control and manufacturing of symmetric arcuate tooth trace gears are solved by using suitable cutter tilt and a new generating method with double-edge gear-wheel cutter. The machining principle is analyzed and the mathematical model of generating motion is established. Then the tooth flank equation and differential geometrical parameters are discussed. Results The minim alteration of cutter tilt will make the contact flank area change so as to satisfy the special requirements. It is easy to realize the tip relief of gearing by altering coefficients of every moving axis. Because the tooth has the arc shape, the symmetrical arcuate cylindrical gears have higher overall strength and it is easy to perform the flank grinding for high precision. Conclusion This new generating method has higher productivity. It is easy to get a perfect contact zone and fully give play to the potential bearing capacity of the gears. The symmetrical arcuate cylindrical gears can be used in highly durable and heavy duty gearing applications.     

Cable Sliding at Supports in Cable Structures

To develop an effective numerical method for the cable sliding problem in cable structures，two-node catenary cable element was built to model the cables based on analytical solution of elastic catenary．Cooperated with Newton method，continuation method Was used to solve the nonlinear equations．This approach is more efficient than using Newton method only and has a wider range to select initial values for the process to converge．The relationship between the tension on a cable segment and its unstrained length was derived and used to calculate the unbalanced cable tensions at the supports．An example is presented to show the correctness and efficiency of the proposed method．     

多车场车辆优化调度模型及算法

针对多车场满载运输问题的特征，提出了多车场车辆优化调度的数学模型，设计了求解该问题的启发式算法，应用结果表明，该算法是可行的。