全局力平衡PDC钻头布齿优化设计

针对聚晶金刚石复合片(PDC)钻头在钻井破岩过程中因受力不平衡，导致钻井倾斜、井径扩大、钻头产生横向振动和涡动，造成钻头早期失效的问题，基于已有PDC钻头切削力学知识，构建了PDC钻头弯曲力矩及全局力平衡布齿优化设计模型，并提出模型求解方法。布齿设计实例结果表明，采用全局力平衡布齿设计方法得到的布齿结构可使PDC钻头在不同进尺条件下均能保持全局力平衡状态，尤其低进尺（小于1 mm）时的力平衡状态得到极大改善，提高了PDC钻头的钻井稳定性，对于改善钻头受力、提升钻头使用寿命、提高钻井质量与效率具有重要意义。     

A CCD-ADI method for two-dimensional linear and nonlinear hyperbolic telegraph equations with variable coefficients

In this paper, a combined compact finite difference method (CCD) together with alternating direction implicit (ADI) scheme is developed for two-dimensional linear and nonlinear hyperbolic telegraph equations with variable coefficients. The proposed CCD-ADI method is second-order accurate in time variable and sixth-order accurate in space variable. For the linear hyperbolic equation, the CCD-ADI method is shown to be unconditionally stable by using the Von Neumann stability analysis. Numerical results for both linear and nonlinear hyperbolic equations are presented to illustrate the high accuracy of the proposed method.     

Numerical investigation of thermal and electrical management during hydrogen reversible solid-state storage using a novel heat exchanger based on thermoelectric modules

In order to reduce the costs generated by the hydrogen solid storage tank's accessories such as the heat exchanger, this work was carried out. It shows thermal and electrical investigations of transient hydrogen (H₂) solid storage in a tank filled with porous medium (LaNi₅) to activate a potential PEM automotive fuel cell. For this purpose, we use a novel heat exchanger with a heat sink combined with thermoelectric modules (TEMs). We realize a simulation that helps us verify if thermoelectric exchanger will be an alternative to the conventional ones. The main results are that a thermoelectric cooler and heater with 127 couples of semiconductors coupled with 19 fins heat sink could be used during the reversible hydrogen solid storage. Also, results show that we can avoid the water freezing at negative temperatures when using a conventional heat exchanger by using TEM during hydrogen absorption. Finally, during the endothermic desorption of the hydrogen, TEG use can avoid boiling water used in the heating system. Also, the hydrogen tank will be lighter and compact without fins and water tubes.     

炼铁-炼钢界面布局紧凑模式

论述了炼铁-炼钢界面的紧凑衔接技术,涉及多维物质流的衔接、传递、匹配及缓冲等过程。从各角度综合分析得出,该界面衔接布置紧凑,占地面积小,实施MES系统的“在线铁水罐跟踪系统”使炼铁-炼钢界面减少了铁水罐周转个数,相对传统方式的铁水包输运方式,保温剂使用量平均减少了0.483 kg/t(铁),铁水入炉温度提高约60 ℃。同时,确保了100%的“一罐到底”命中率,大幅节省了耐材费用,具有显著的经济效益和社会效益。     

电弧喷涂FeCrAlW涂层组织的致密化研究

采用激光辐照对电弧喷涂FeCrAlW涂层的组织进行致密化处理,借助扫描电镜和X衍射对涂层的组织和相结构进行了分析,测试了涂层的显微硬度。结果表明:涂层组织致密度提高,气孔明显降低。随着激扫描速度的增加,涂层的显微硬度降低,致密化层的最高硬度略低于喷涂层的硬度,为HV800~1 000。其主要原因是涂层受热不足相变不很充分,形成了高温回火所致。     

硬致密泥岩钻进的新型复合片钻头的研究与应用

介绍了一种新型齿形的复合片钻头，在硬致密泥岩中钻进，与常规复合片钻头相比，具有很高的钻进效率和高的钻头寿命，解决了泥岩钻进效率低的难题。     

THE PRINCIPLE OF DIAMOND DRILLING

ＴＨＥＰＲＩＮＣＩＰＬＥＯＦＤＩＡＭＯＮＤＤＲＩＬＬＩＮＧＬｉＳｈｉｚｈｏｎｇＣｈｉｎａＵｎｉｖｅｒｓｉｔｙｏｆＧｅｏｓｃｉｅｎｃｅｓ，Ｂｅｉｊｉｎｇ，１０００８３，ＣｈｉｎａＴＨＥＰＲＩＮＣＩＰＬＥＯＦＤＩＡＭＯＮＤＤＲＩＬＬＩＮＧＬｉＳｈｉｚｈｏ...     

尖山铁矿矿体地质特征新认识及找矿方向

尖山铁矿床产于下元古界尖山群袁家村组含铁岩系中，矿体受尖山向斜构造控制，同时断裂构造对矿亦有较大的影响，使主矿体向下延伸和错移。     

轨网功能性拓展引导空间紧凑型调整——上海新一轮综合交通体系规划主旋律

总结分析上海轨道交通网络拓展后产生的新问题和新要求,如出行时耗长、线路拥挤、单一用地功能带来的客流不均衡性问题,以及轨道交通对引导用地空间紧凑型的要求等。提出了轨道交通线网规划的"高强客流1小时法则",以及轨道交通与用地功能调整的"轨站四圈法";提出了"市郊快线、宽通道、换乘区"等概念与规划理念,以及基于轨道交通车站或枢纽的四种用地功能开发模式。最后对上海新一轮综合交通体系规划思路、国家相关技术规范改进与完善提出了建议,提出了加强轨道交通系统自身以及轨道交通系统与土地利用的关系的内在规律研究的建议。     

PDC刀具切削花岗岩过程的微裂纹扩展

采用偏光显微镜观察ＰＤＣ（聚晶金刚石复合片）刀具切削花岗岩的微观过程，研究切削过程微裂纹产生和扩展的规律。分析了矿物特性如矿物成份、晶粒大小及初始裂纹等对微观裂纹扩展路径的影响。研究结果表明：在切削深度较小时，矿物特性对花岗岩微裂纹的产生与扩展过程起主导作用。