In view of the problems encountered in previous hydraulic 6-DOF parallel mechanism projects, flexible modes appear that actual natural frequencies x and y degrees freedom are lower than those obtained through calculation. The phenomenon above not only decreases dynamic response characteristics mechanism, but also leads to doubts about performance mechanism. real reason for is solved this paper....

This paper first designs a new 5-DOF parallel mechanism with 5PUS-UPU, and then analyses its DOF by traditional Grubler–Kutzbach motion spiral theory. It theoretically shows that the meets requirement of five dimensions freedoms including three-dimensional movement two-dimensional rotation. Based on this, real is built, but unfortunately it found unstable in some positions. Grassmann line geome...