从提高驱动效率、改善输出性能的角度出发，研制了一台新结构形式的圆柱形多自由度超声电机，对电机定子的工作模态和电机的输出性能进行了测试。
A new cylinder type ultrasonic motor with multi-degree of freedom was developed based on increasing its driving efficiency and improving its output characteristics.
自90年代并联机床问世以来，研究者提出了多种并联机构的结构形式，并且在多自由度并联机构方面作了许多有益的工作。
Since parallel machine tool come out in the 1990s, the researchers have proposed diversiform parallel architectures and done a lot of useful work of multi-degree-of-freedom parallel architecture.
自由式磨料磨损现象在农业机械、工程机械、煤炭机械、建筑机械等工程领域中广泛存在，是导致这些机械与自由式磨料接触的工作部件的主要失效形式之一。
The phenomena of free abrasive wear widely occur in the working components of agricultural machines, earthmoving machines, coal-mining machines, construction machines and others.
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