Research of EDM Spark Locations in Die-sinking

Detection of 2-dimention spark locations by electromagnetic detection method in electrical discharge machining (EDM) is studied. The method, which is applied and investigated, is based on the fact that the release of energy from a spark is transformed into electromagnetic wave around the workpiece. A new sensor system composed of high precision linear Hall components and cubic ferrite is used to detect the intensity of magnetic field. Relation equation between the output of the sensor system and 2-dimention spark locations experiment under a spiculate electrode is introduced, and its diagram of curve is drawn. As a result, the information that can be achieved by detecting spark‘s location gives new possibilities for an extended analysis of the EDM-process.     

高纯三氯化锑的制备

研究了SbCl     

提高FFT运算速度的几项措施

根据DEF运算的线性特性、数字计算机的结构、汇编语言的特点,提出了几项能进一步提高FFT运算速度的措施,可以以定点运算的速度达到了浮点运算的精度.该几项措施已经运用在ZZ-1旋转机械故障分析仪的功率谱运算之中.实践证明,提高FFT运算速度的效果是十分明显的.     

一种卷绕传输系统的建模、辨识与混合灵敏度H∞鲁棒控制

介绍了一个由开卷轴、拖动轴、收卷轴和两个张力感应器组成的织物卷绕传输系统的建模及模型的参数辨识，并采用混合灵敏度多变量H∞鲁棒控制来改善系统的控制性能，减少织物张力与速度之问的耦和。     

Stability and Robustness Analysis of an Adaptive Algorithm for Quasi-periodic Disturbances Rejection

IntroductionThere exist several approaches to tackle periodicdisturbance rejection problems. One approach is based onrepetitive or learning control principles[1], it has gainedsome popularity in various applications where periodicdisturbances rejection or repetitive tracking is required.These applications include the control of disk drives[2],rejection of load disturbances in steel casting process[3],eccentricity compensation in rolling[4] and so on. This typeof …