The velocity constraint subspace of each branch chain was obtained by means of solving the screw system of each branch chain of 3-PTT parallel mechanism.
通过求解3-PTT并联机构各支链的螺旋系得到各支链的速度约束子空间。
A new branch of database-constraint database is presented.
介绍了数据库研究的一个新领域——约束数据库。
A new branch of database-constraint database is presented.
介绍了数据库研究的一个新领域——约束数据库。
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