张力环 meaning in Chinese

strained ring
tension link

A double closed loop ( let - off loop and velocity loop ) control methods for the let - off controller are discussed , the parameter for applying pid in let - off system is also given . the settle of this problem will give much reference to the later loom development
本文讨论了双闭环控制(张力环和速度环)设计方案，给出pid控制的控制参数，为后面的改进工作提供了参考依据。