Application of Ultrasonic Technology in Detecting of Sludge Level

The basic principle and the method of detecting the sludge level have been presented,and the merits and demerits of different methods have been compared. The method of detecting by ultrasonic has been put forward based on characteristic and the need of measuring of sludge level.     

Properties of Surface Cyclic Oligomers Present on Polyester Fiber

The effects of different treatments, such as dry heat,wet heat, solvent vapor and ultrasonic, on propertiesof the cyclic oligomers on the surface of polyester fiberare studied. The components of surface oligomers areanalyzed through Thin-Layer Chromatograph. Theresult shows that: all of the treatment, especially     

外伤性脾破裂超声诊断临床分析

目的：探讨B超检查对脾破裂的诊断率与临床应用价值．方法：对33例B超诊断脾破裂与术后发现进行对照分析，经手术证实与其完全相符．结果：B超检查准确率为95．2％．结论：B超对脾破裂能够做出明确诊断，并能发现损伤的轻重程度及其它合并伤，直观、简单、准确率高．     

Research on Ultrasonic NDT System for Complex Surface Parts

Aimed at inner quality controlling for complex surface parts, an ultrasonic testing system for complex surface parts has been developed using ultrasonic NDT(Non-destructive Testing)which has features of strong penetration, well direction, high sensitivity, low cost, and harmless to people and material. The technologies of the computer, NC (Numerical control), precision mechanism, signal analysis and processing were integrated in the testing system. The system includes a PC, system software, ultrasonic data ...     

Research on Influence of Cutting Conditions on Roundness of Ultra-thin Wall Parts in Ultrasonic Vibration Cutting

In the paper, the experimental researches were carr ie d out to discuss the roundness forming rule and the influence of cutting paramet ers on roundness by ultrasonic vibration cutting of the camera‘s guiding drawtu be with 47.75 mm diameter and 0.6～1.5 mm wall thickness. The research results s h ow that the roundness error of ultra-thin wall parts in ultrasonic vibration cu tting is only one third of that in common cutting. The relations between the rou ndness error and the cutting parameters behave as: (1...     

薄壁焊缝的超声板波检测方法研究

针对高压薄壁焊接钢筒工件的内部质量检测问题,通过对五种常规无损检测方法的比较,确定了采用超声波板波法的优点.本介绍了板波的原理、特点、速度与入射角的关系、模式的能流分部并绘制了能流分部图.以高压薄壁焊接钢筒检测为例进行了现场试验,并以X射线检测复测来确认板波检测的可靠性,对比试验结果证明,超声波板波法可有效的发现高压薄壁焊接钢筒焊缝内部缺陷,并可实现快速在线检测,具有广阔的应用前景.     

振动参数对筛分效率影响的实验研究

选用经过干燥的硅粉、钼粉和锌粉物料作为典型物料研究对象,通过实验研究振动参数对颗粒筛分效率的影响.首先,研究振动频率、偏心块夹角、料层厚度、不同物料性质对普通旋振筛筛分效率的影响,得出典型物料在普通旋振筛作用下的最佳振动参数;然后进行超声波振动实验,实验表明,超声波振动能够有效打散细粉物料颗粒团聚体,解决筛孔堵塞问题,显著提高了筛分效率.根据实验结果可以获得硅粉物料颗粒在普通振动和超声波振动综合作用下的最佳组合参数.     

超声微锻造辅助激光熔丝增材制造数值模拟研究

激光熔丝增材制造技术能大大提高制造效率,但制件存在复杂的残余应力,导致制件内部缺陷多.为了解决这些问题,将超声微锻造与滚压相结合对制件表面进行高频率击打,使金属表层产生塑性变形,将原有的拉应力转变成压应力.以TC4为研究对象,利用ANSYS对激光熔丝过程进行热-结构耦合数值模拟,并施加超声滚压微锻造,分析微锻造前后应力场的变化情况.研究结果表明:激光熔丝熔覆层应力分布更加均匀,拉应力减小,甚至转化为压应力,有效地抑制制件内部缺陷的形成.