双尺度低氮燃烧技术在国产330MW机组的应用

为了达到宁夏地区要求现役330MW级别火电机组NOx排放值100mg／Nm^3以下和改善环境的目的,青铜峡铝业发电有限责任公司对1号锅炉的燃烧器进行技术改造。结果表明：改造后锅炉在330MW负荷下NOx排放平均值为240mg／Nm^3,比改造前降4R,45％;锅炉效率达到93．39％（高于设计值0．01％）、飞灰含碳量2．98％（低于设计值0．02％）、过热器减温水量和再热器减温水量均小于设计值;有效解决了锅炉改造前的结焦和超温现象。     

端羟基液体丁腈橡胶对聚氨酯泡沫塑料性能的影响

采用一步法制备聚氨酯硬质泡沫塑料(RPUF)。考察了端羟基液体丁腈橡胶(HTBN)对聚氨酯硬质泡沫塑料表观密度、吸水性能、力学性能等的影响。结果表明:随着HTBN含量的增加,硬泡PU制品的密度逐渐降低,压缩强度、弯曲强度呈降低趋势,吸水率增加。     

镍基氧化铝纳米微粒复合电镀的研究现状

以Al2O3纳米微粒为复合材料的复合电镀是一种取代镀硬铬的极有价值的复合表面技术。Al2O3微粒与镍金属共沉积可明显提高镀层的硬度、耐磨性与耐蚀性。主要阐述了Al2O3纳米微粒与金属镍共沉积的工艺条件对沉积速率和镀层性能的影响。并且指出Al2O3纳米微粒复合镀镍中关键问题是如何提高复合镀层中纳米微粒的含量及镀层形貌对镀层性能的影响,以寻找控制镀层表面形貌的条件。     

固化参数对铝合金复合材料修补性能的影响

用复合材料补片粘接修理铝合金损伤结构,研究了固化参数对强度恢复效果的影响。利用有限元软件分析粘接结构,证实了应力集中区域与试验中的损伤部位及路径基本吻合。分析了固化参数中的升温速率和抽真空加压时机对粘接效果影响,升温速率不能过大,抽真空加压不能过晚,否则会造成胶层固化后其中的挥发分和空气来不及排除而产生胶层空隙缺陷。     

面向驱动桥壳再制造的塑性损伤研究

为研究废旧驱动桥壳局部区域的塑性损伤,定量评估驱动桥壳的塑性变形率,以驱动桥壳本体材料510L钢板制备拉伸试样,分别将试样拉伸到不同的塑性变形率,用X射线衍射技术、金属智能磁记忆分析技术、扫描式电子显微镜综合评价了材料的塑性变形率与X射线信号和磁信号的关系,观测不同塑性变形率下的晶体结构变化特征。结果显示：在强化阶段,X射线衍射峰宽可定量计算材料的塑性变形率,磁场法向分量Hp(y)较小。      

铂电阻传感器自动检定系统设计与实现

文章对制冷恒温槽的温控器、数显式温度标准器、扫描采集器等检定设备的串口通信协议进行了研究,利用VB 6.0和SQL2000设计了铂电阻传感器自动检定系统,测试结果表明：该系统无需硬件投入,性能可靠,操作方便,可满足铂电阻传感器检定需要,对提高检定效率、保证检定数据的可靠性具有重要的意义.     

基于虚拟仪器的某型无人机电气参数检测系统

针对某型无人机电气参数快速检测的需求,设计了一种基于虚拟仪器的无人机电气参数检测系统。该检测系统的软件设计采用LabVIEW软件开发平台,主要由数据采集模块、数据管理模块和数据分析与处理模块等组成。实际应用表明,该系统测试结果准确,具有运行稳定可靠、操作方便、维护简单的特点,达到了设计要求。     

Optimal design of a main driving mechanism for servo punch press based on performance atlases

The servomotor drive turret punch press is attracting more attentions and being developed more intensively due to the advantages of high speed,high accuracy,high flexibility,high productivity,low noise,cleaning and energy saving.To effectively improve the performance and lower the cost,it is necessary to develop new mechanisms and establish corresponding optimal design method with uniform performance indices.A new patented main driving mechanism and a new optimal design method are proposed.In the optimal design,the performance indices,i.e.,the local motion/force transmission indices ITI,OTI,good transmission workspace good transmission workspace(GTW) and the global transmission indices GTIs are defined.The non-dimensional normalization method is used to get all feasible solutions in dimensional synthesis.Thereafter,the performance atlases,which can present all possible design solutions,are depicted.As a result,the feasible solution of the mechanism with good motion/force transmission performance is obtained.And the solution can be flexibly adjusted by designer according to the practical design requirements.The proposed mechanism is original,and the presented design method provides a feasible solution to the optimal design of the main driving mechanism for servo punch press.     

基于SINUMERIK 840D系统HS6000加工中心刀库管理应用研究

阐述了西门子840D系统刀库管理在HS6000加工中心改造的应用,给出西门子840D系统刀库管理中对链式刀库进行配置和参数设置的方法,有利于数控机床的改造。     

A new type of amperometric oxygen sensor based on a mixed-conducting composite membrane

A new type of amperometric oxygen sensor has been developed in which a dense Pt-YSZ composite layer, a mixed ionic–electronic conductor (MIEC) membrane, is used as the diffusion barrier. Accelerated materials stability tests in the exhaust of a gas-fired engine indicate that yttria-stabilized zirconia (YSZ) with fluorite structure has excellent stability while the stability of La₀.₉Sr₀.₁Ga₀.₂Mg₀.₈O₃ (LSGM) is questionable. A dense Pt-YSZ composite layer has been prepared on a YSZ electrolyte using nanoparticles of platinum, derived from a sol–gel process. The fabricated sensors based on a bi-layer structure, Pt-YSZ/YSZ, exhibit well-defined diffusion-limited currents for oxygen concentrations up to 6% and the current responses depend linearly on oxygen concentration. The developed sensor is anticipated to have excellent chemical, microstructural, and thermal stability because of the remarkable stability of a dense composite layer consisting of YSZ and Pt.