斜齿轮对角修形设计研究

对角修形是一种采用在斜齿轮上三维修形技术,对角修形较常规修形相比,齿面没有修整的部分小很多,保留齿面更大的有效承载面积,可明显降低齿面接触应力,减小传动误差。本文针对斜齿轮对角修形的基本原理,首次提出了斜齿轮对角修形设计要点,并对船舶典型齿轮箱中的一对斜齿轮进行对角修形设计及计算分析,本研究对修形齿轮的设计具有一定的指导作用。     

对抑制混凝土碱-骨料反应试验因素的分析

在矿物掺合料及外加剂对抑制混凝土碱一骨料反应有效性试验中，各操作步骤对试验结果产生影响的因素较多。为此，针对具体操作中需要注意的事项进行分析、说明，以避免试验中因操作不当造成试验结果不准确。     

人字齿轮减振降噪的修形设计(英文)

To reduce vibration and noise and increase transmission efficiency, a three segment method for modifying the pinion profile was proposed. Cutter surface equations were deduced by changing the shape of the cutter-edge, substituting three segment parabolas for the line. The influence of longitudinal tooth modifications on tooth surface load distributions was discussed. Transmission error minimization and uniformity of tooth surface load distribution were chosen as optimization goals and the modified parameters were obtained by applying the complex method. Finally, an experiment comparing the loaded transmission error, vibration, and noise both before and after modifications was carried out. The results indicate that the modified design is reliable.     

对国家标准《水泥比表面积测定方法勃氏法》修订的分析

在修订GB/T8074-1987《水泥比表面积测定方法勃氏法》时,引用了JC/T956-2005《勃氏透气仪》,对空隙率的选用更加细化,并增加对自动勃氏透气仪的规定.从这3个方面分析GB/T8074-2008《水泥比表面积测定方法勃氏法》的主要修订内容,以使试验人员更好地理解、应用标准.