大型化肥压缩机工作状态智能监测与故障诊断的研究

本文利用人工神经网络理论,通过对设备振动信号采集、处理和提取特征参数的方法对大型化肥压缩机工作状态与故障进行智能监测与诊断。     

手套横机浮动推杆共轭凸轮机构的综合研究

以浮动推杆共轭凸轮机构为研究对象 ,导出了机构的综合方程和压力角表达式 ,进而对手套横机的七行程共轭凸轮机构进行了实例综合 ,验证了本方法的正确性     

炉前液压泥炮常见故障分析

液压泥炮是高炉重要的组成部分,是堵铁口的专用设备,因为泥炮故障造成的高炉慢风、休风现象较多,成为制约高炉生产的瓶颈。该文通过分析控制液压泥炮动作的工作原理及其故障,总结了炉前泥炮常见故障现象并提出了改进措施。正确分析排除液压泥炮的故障,是高炉稳定运行的重要条件。     

资源城市井露采动引起公路沉陷灾害机理研究

针对资源城市矿产开采规模的扩大和交通货物运输量的日益增长,使得井工、露天矿区基础运输设施建设以及与之紧邻的城市交通建设和开采引起的公路沉陷灾害的矛盾越来越突出。本文针对资源城市—山西溯州市平溯矿区井露联合开采新模式引起的矿区公路与地面建(构)筑物变形与破坏这一情况,利用模拟分析技术进行了开采对公路造成沉陷机理和演化规律的研究,并建议了相应的处治措施。     

TY220推土机工作无力的故障分析与排除

工作无力推土机常见的故障。本针对ＴＹ２２０推土机工作无力，进行了系统地分析，并采用简单的诊断方法，找出故障点，从而迅速地排除了故障。     

连续墙梁水平及竖直截面应力的分布规律

采用有限元计算程序分析了连续墙梁无洞口与有洞口水平及竖直截面的应力分布规律 ,并与试验结果进行了比较。最后还给出了墙高不同时连续墙梁界面应力分布的变化 ,供工程师分析连续墙梁时参考     

1076防老剂在顺丁橡胶中的应用

通过小试和工业试验，考察了1076防老剂对顺丁橡胶物理机械性能、门尼粘度、凝胶含量及抗老化性能的影响，查出了门尼升值高和凝胶含量增加的原因，提出了使用1076作为顺丁橡胶防老剂时干燥工艺条件的改进意见。     

微生物浸矿菌群的选育及培养

微生物浸矿技术是以湿法冶金和微生物学为基础的一门交叉学科,具有环境友好,反应温和,流程短,能耗低的优势。但是由于在使用微生物浸矿时菌群易受到特殊毒害因素或环境条件的影响,从而降低矿石的浸出率。因此在微生物浸矿技术中,针对性菌群的选育及培养技术占据了比较重要的地位。文章对浸矿菌群的选育及培养的方法进行了综合性地介绍和评述。     

城市污水管道电视检测分析

介绍了对东莞松山湖台湾高科技园区工业污水处理厂进站污水管道进行CCTV(Closed circuit television)内窥电视摄像检测分析的过程,其结果可为管道竣工验收、移交养护和维修提供依据。     

Postfire mechanical properties of Galfan-coated steel cables

Galfan-coated steel cables are widely used in prestressed structures due to their excellent mechanical properties and corrosion resistance. Their postfire mechanical properties are important to evaluate the residual load-bearing capability of the structures after fire. However, the research on the postfire mechanical properties of Galfan-coated steel cables is stillscarce, especially the cable in stress state. Hence, a research based on experimental study was carried out to investigate the deterioration of mechanical properties of Galfan-coated steel cables in stress state after experiencing elevated temperatures in this paper. Eighteen tensile tests were conducted on specimens exposed to elevated temperatures varying from 100°C to 500°C and then cooled down to ambient temperature in air. Both twisting characteristic and constant stress level of Galfan-coated steel cables were considered in this study. The residual nominal yield strength, ultimate strength, elastic modulus, fracture strain, and stress-strain curves of Galfan-coated steel cables after experiencing elevated temperatures were obtained and compared with the existing researches. The results show that the postfire mechanical properties are obviously decreased when the fire temperature exceeds 300°C. Equations for the residual nominal yield strength, elastic modulus, ultimate strength, and fracture strain of the Galfan-coated steel cables were proposed. Furthermore, a modified two-stage Ramberg-Osgood model for Galfan-coated steel cables after experiencing elevated temperatures was established, which can provide reference for the safety assessment and repairment of prestressed structures after fire.