文中从双环网络的图论模型出发，证明了双环网络中一个被广泛关注的问题，即双环网络直径的对称性，并给出了一些应用。
This paper starts off with the FIG model, proves one important matter about double loop networks, namely, the symmetry about double loop networks, and enumerates some applications.
本文介绍了电动环链葫芦用三相双速异步电动机的主要性能指标以及在试制过程中遇到的问题。
The paper introduces the main performance indexes of double speed three phase asynchronous motor used in electric chain hoist and the problems which occor in the test and manufacture process.
针对这一问题，提出了采用速率环和稳定环的双环控制方法，并结合非线性加速度补偿技术，只采用一级稳定即实现了较高的稳定精度。
To solve this problem, a method using double speed loops, combined with technique of nonlinear acceleration compensation is brought forward and applied in the servo system.
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