异步电动机定子串不对称电抗起动的瞬态分析

对三相笼型异步电动机定子串不对称电抗的起动过程进行瞬态分析。为了得到起动特性,根据三相异步电动机在相坐标系下的瞬态数学模型,编写计算机仿真程序,通过实例对三相笼型异步电动机的定子电路一相串联电抗时的起动过程进行仿真计算;用对称分量法分析定子电路一相串联电抗时的不对称系统,确定起动电抗的数值。对仿真结果进行比较分析。

The Application of Levenberg-Marquartb Algorithm in EEG Inverse Problem

EEG inverse problem has great significance and importance for both cli nical and research applications. It discusses EEG dipole source localization pro blems solved by nonlinear local optimization methods, such as Levenberg-Marquar t b. This paper presents the relation between location errors and noise level on c ondition that the source number is known; if the source number is not known, the selected number in model may not equal to the actual one, and a computation is carried out and a corresponding discrimination criteria is proposed. Computer si mulation demonstrates that Levenberg-Marquardt algorithm is better than global methods if the source number is small.

BCH公司Tudorware型纸板计数器确保精确的纸板记数

随着瓦楞纸板的生产越来越富有竞争性，对所生产的纸板精确记数的需求也越来越高，由于纸板生产一直朝着自动化的方向前进，由位于英国BCH技术公司所生产的Tudorware型纸板计数器凭借其灵活性，也能满足瓦楞纸张纸板工业的未来需求。