Abstract
An analytic expression for the singularities of six-degree of freedom
Stewart-platform type parallel manipulator (six-DOF SPM) is obtained
using the concept of local structurization method (LSM) with extra
sensors. The resulting equation, however, does not include sensor
values. It is only a function of design variables. The equation is
basically a third-degree polynomial and it exactly provides singularity
information of general SPM's, Several symbolic examples are shown
to verify the exactness of the singularity equation by comparing
it with previously reported singularities. Some other numerical examples
are also shown using the proposed singularity equation.
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