自由变形圆环法作为盾构隧道管片衬砌设计的传统方法，其计算结果虽安全但偏于保守。
As a traditional method of shield tunnel segment designing, the free displacement ring method is safe but conservative.
该方法用存贮图象的几何中心位置和相应的圆环参数值代替了传统的图象匹配法中需要存贮图象全部信息的方式，克服了数据压缩所带来的诸多麻烦。
In the method, we store the geometric centers and the values of the ring-data other than storing all information used in traditional method. Many difficulties to press data have been overcome.
传统的圆环型行波超声电机定转子之间的接触状态为动态的点面接触，造成其输出力矩低。
The contract states between the stator and the rotator of traditional ring type traveling wave USM is dynamic point-area contract, which lead to low output torque.
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