Ta. Huang et al., Determination of closed form solution to the 2-D-orientation workspace of Gough-Stewart parallel manipulators, IEEE ROBOT, 15(6), 1999, pp. 1121-1125
A novel methodology to formulate the closed form solution to the orientatio
n workspace of Gough-Stewart parallel manipulators is presented by using a
fictitious four-bar spatial linkage model. The possible mechanical constrai
nts are considered which include the strut length and the passive joint lim
itations. Several examples are given to illustrate the effectiveness of thi
s approach.