高精度倾角数字化测量

本文设计采用电容式重力变换器和CDC史．路给合，通过传感器的电容量测量，标定倾角的大小弄口方向，采用合适的数据处理和温度补偿，能得到较高精度的测量结果。     

井斜实时测量方法研究

介绍了用重力加速度传感器进行井斜实时测量的方法，阐述了重力加速度传感器的工作原理及其测量井斜的算法，从理论角度分析了实钻中严重干扰井斜信号的因素——噪声、钻具的振动和随机转动，其中噪声和振动信号可采用低通滤波器滤除，而转动使加速度计因离心力产生的测量信号失真，则可通过诸如转速补偿之类的修正去除。经专门的实验装置验证此井斜测量方法和信号处理方法可进行较高精度的井斜实时测量，为高精度的井斜控制奠定了基础。     

The multiaxial weld root fatigue of butt welded joints subjected to uniaxial loading

In this study, the fatigue strength of inclined butt welds subjected to a proportional multiaxial stress state generated by uniaxial loading is studied in nominal and local stress concepts. The local methodologies studied included principal stress hypothesis, von Mises stress hypothesis and modified Wöhler curve method. Nominal methodologies included modified Gough–Pollard interaction equation, the design equation in Eurocode3 and the interaction equation in DNV standard. Results are evaluated along with data published in relevant literature. It is observed that both local and nominal stress assessment methods are able to estimate multiaxial fatigue strength. No obvious difference in fatigue strength is observed in the nominal stress concept, but the notch stress concept is able to capture a decrease in fatigue strength in shear‐dominated joints. It is concluded that modified Wöhler curve method is a suitable tool for the evaluation of fatigue strength in joints dominated by both normal and shear stresses.     

斜井反井钻导孔施工孔斜控制与纠偏技术

水利水电地下工程中的斜井开挖,施工难度大、安全隐患突出,采用阿里玛克爬罐与反井钻机对向施工结合的方式进行导井的开挖施工是一种高效的施工方法,反井钻导孔钻孔孔斜的施工精度,是这种方案成功与否的控制关健。文章介绍了反井钻施工斜井导孔时偏斜原因、偏斜控制与纠偏措施。     

定向纠斜技术

定向纠斜技术是定向钻井技术 在直井中的运用 和发展，是快速纠斜 和保证超标脱靶 直井安全钻达目标靶区的最简捷的技术方法。     

基于无传感器信息的数控机床导轨水平倾角测量方法研究

基于无传感器信息,结合先进的数据处理技术和特征提取方法对数控机床导轨水平倾角进行测量,实现导轨水平倾角的无传感器测量。与传统的测量装置相比,无传感器信号信噪比更高,不仅能在空载下测量,还可以在机床加工过程中测量。     

直接法——外语教学的演变与发展之二(英文)

本文是“外语教学的演变与发展”的第二部分,论述直接教学法。     

A THREE-SEGMENT HYDRAULIC MODEL FOR ANNULAR CUTTINGS TRANSPORT WITH FOAM IN HORIZONTAL DRILLING

Through mechanical analysis, an improved hydraulic model for annular cuttings transport with foam was established for horizontal drilling. Based on the two critical inclination angles, the entire well was divided into three segments. The Bagnold stress, generalized power law rheological model and modified hindered particle settling velocity in foam fluid were adopted in the model to improve the simulation accuracy. The proposed model allows more precise prediction of cuttings transport property in the whole range of well inclination angle. Model performance was examined via case study and experimental data. Simulation results given by the propulsion iteration and trial-and-error method agree well with in-situ horizontal well drilling practice for the case study, and the comparison between the model prediction and Capo’s experimental data shows satisfactory agreement.     

关口水电站地下厂房岩壁式吊车梁设计

岩壁式吊车梁是一种新型结构形式，目前尚无规范可循。关口水电站地下厂房岩壁式吊车梁的设计，采用平面力系平衡的方法来分析梁的稳定，其中壁座倾角、锚杆参数选取是岩壁式吊车梁设计的关键。对中小型水电站来讲，按照施工技术要求：把好施工质量关，是岩壁式吊车梁成败的关键。