first-order loop 一阶环路

second order loop 二阶环路

high-order loop 高阶环路

first-order phase-locked loop 一阶锁相环

high order loop 高阶环

second-order loop 二阶环路

third order loop 三阶回路

Work Order Closed Loop 工单闭环

first order inertial loop 一阶惯性环节

closed-loop third-order s-domain 闭环三阶s域