In recent years, variable speed hydraulic couplings have been wildly used in many areas, such as Electric Industry, Iron & Steel Industry, Petrochemical Industry, Transportation, Municipal Engineering, Military Equipments, and so on. However, most of the hydraulic couplings are of open-loop control mode at present, the dynamic property and transmission quality is not satisfying. With the development of science and technology, especially computer technology, closed-loop control of hydraulic couplings has been attracting more and more attention. So it is much meaningful to do some research on servo mechanism, control component, control theory and other related aspects.There are many difficult problems to be solved in hydraulic couplings,...
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