This paper introduces the testing priciple of the drilling fluid lubrication tester,describes the priciple of direct current electromotor PWM modulatio,as well as ripple suppression theory and method in the switching process.
文章介绍了以PHILIPS P87LPC768单片机为核心的极压仪(钻井液润滑测试仪)测试的基本原理,并结合直流伺服电机的控制技术,阐述了直流电动机PWM调速原理,电枢电流斩波控制中为使电感电流连续导通斩波器开关频率的选取,以及在整流过程中产生的纹波抑制的理论和方法问题。
Furthermore,with increasing concentration of complex herba lysmachiae,the growth inhibition index of calcium oxala.
而且,随着复方金钱草浓度的增加,一水草酸钙晶体生长抑制指数增大。
Root inhibition index Ⅱ reached 29.
结果表明,铅对各指标的影响由大至小依次为根长、芽长、生物量、发芽指数、发芽率;根长抑制指数Ⅱ达29。
CopyRight © 2020-2024 优校网[www.youxiaow.com]版权所有 All Rights Reserved. ICP备案号:浙ICP备2024058711号