同轴平行孔系的加工表面质量工艺改进

同轴平行孔系结构常用来作为主要的支承零件,平行孔系表面为与轴承外圈的装配面。本文通过分析其轴承档表面加工的现有制造工艺,提出采用修改切削参数的方式来改善现有的表面加工质量。在试验的基础上进行加工验证,论证了此方法的可行性,并对同类产品的加工表面质量提升有一定的借鉴意义。     

Exciting forces for a wave energy device consisting of a pair of coaxial cylinders in water of finite depth

Two coaxial vertical cylinders-one is a riding hollow cylinder and the other a solid cylinder of greater radius at some distance above an impermeable horizontal bottom,were considered.This problem of diffraction by these two cylinders,which were considered as idealization of a buoy and a circular plate,can be considered as a wave energy device.The wave energy that is created and transferred by this device can be appropriately used in many applications in lieu of conventional energy.Method of separation of variables was used to obtain the analytical expressions for the diffracted potentials in four clearly identified regions.By applying the appropriate matching conditions along the three virtual boundaries between the regions,a system of linear equations was obtained,which was solved for the unknown coefficients.The potentials allowed us to obtain the exciting forces acting on both cylinders.Sets of exciting forces were obtained for different radii of the cylinders and for different gaps between the cylinders.It was observed that changes in radius and the gap had significant effect on the forces.It was found that mostly the exciting forces were significant only at lower frequencies.The exciting forces almost vanished at higher frequencies.The problem was also investigated for the base case of no plate arrangement,i.e.,the case having only the floating cylinder tethered to the sea-bed.Comparison of forces for both arrangements was carried out.In order to take care of the radiation of the cylinders due to surge motion,the corresponding added mass and the damping coefficients for both cylinders were also computed.All the results were depicted graphically and compared with available results.     

对内燃机和自动变速器间联接圆盘设计参数的新认识

自动变速器的驱动盘在传动线路中,是一应力很高的传动部件。驱动盘的损坏可使车辆停止运行。另外,在驱动盘断裂时,还会引起发动机或自动变速器的损坏。在不同驱动盘同轴度的研究中,单一载荷不是主要的。引起同轴度误差的循环弯曲交变载荷,也会导致驱动盘的停机(断裂)。在实际动力传递中,绝不会出现单一载荷,而呈现出复合载荷状态。GIF研制的不同载荷组合的FE(有限元)模型和试验装备,可反映出动力传递的真实载荷情况,并模拟损伤状态。因此,在车辆中出现的损伤现象,在试验台上都能得到精确的再现。在研究时,GIF以变扭器膨胀与使用力矩的组合,作为变扭器的临界载荷。     

耦合微波介质同轴谐振器的带通滤波器设计

由1／4波长介质同轴谐振器作为分布参数元件，用集总参数的贴片电容耦合，构成带通滤波器。根据所设计的滤波器技术指标，确定滤波器的类型，级数，结构。然后将其中的并联谐振结构替换为采用高介电常数的介质同轴谐振器。通过仿真验证，最后制作出符合要求的带通滤波器。     

二维位敏传感器PSD在同轴度精密测量中的应用

介绍了新型光电位置敏感器件PSD的工作原理、适用范围及其信号检测与处理电路，提出了一种基于PSD检测系统及其在空间同轴度测量中的实现方法．实验结果表明：检测系统测量精度高、可靠，能满足工程轴系同轴度检测需要．     

混凝土搅拌运输车筒体制作工艺优化方案

混凝土搅拌运输车对筒体同轴度精度的要求较高,目前由于受简体中柱筒结构和老式工艺装备的局限而难以满足工艺要求,致使筒体的制作效率低、工时成本高、安全系数低。为此,对筒体的中柱筒结构进行了改进,同时改进了组对工艺装备,由此在保障同轴度精度的前提下,简化了工艺流程,降低了工时成本,提高了工作效率和操作的安全性。     

关于壳体零件同轴度标注方式与检测

本文作者以汽车主减速器壳轴承孔同轴度的检测为例,介绍了实际工作中因为不同的标注方式、以及使用不同的检测方法,所导致的同轴度测量误差,希望各位读者能有所收获,并能够用于指导生产。     

基于CMOS图像传感器的船舶轴系同轴度测量方法研究

对一种用于中型以上船舶轴系支承孔同轴度的CMOS图像传感器测量方法及测量精度进行了分析。安装测量基准线采用带单模尾纤的准直半导体激光,轴孔中心位置传感器由CMOS面阵与旋转电感量头组成。该方法不仅满足船舶轴系支承孔同轴度测量的精度要求,而且具有良好的经济性和灵活性,可以推广到相类似的大孔同轴度的装配定位与精度测量。