3Merlet J P. Parallel robots[M]. Dordrecht: Kluwer Academic Publishers, 2000.
4Wang J, Gosselin C M. Singularity loci of a special class of spherical 3-DOF parallel mechanisms with prismatic actuators[J]. ASME J of Mechanical Design, 2004, 126 (2) : 319-326.
5ANDRZEJ S, GRZEGORZ T. Grader blade stabilization system[J]. Automation in Construction, 1998, 7(5). 385-389.
6ANDRZEJ S, GRZEGORZ T. Grader blade stabilization system [J]. Automation in Construction, 1998, 7 ( 5 ) : 385 - 389.
7JOHN C,RAYMOND A. Slope controls: US, 3561538 [P]. 1971-02-09.
8WILLIAN R, TILLMAN. Blade control apparatus of a motor grader including wand vibration damping element: US,4009758 [P]. 1977-05-01.
9YANG G L, HO EHL, LIN W, et al. A differential geometry approach for the workspace analysis of spherical parallel manipulators [C] // 11th World Congress in Mechanism and Machine Science. Tianjin: China Machinery Press,2004, (04) : 2060 - 2065.
