Abstract
The paper considers a three degrees of freedom mechanism, which output link is oscillating in vicinity of the singular positions. Various types of the mechanism motion are observed depending on initial conditions, mass of the output link and feedback coefficients of the drives. In particular, transition through a specific position (singularity) could take place. Translational drives of such a mechanism are positioned along the edges of a pyramid formed by the tripod kinematic chains. Axes of the drives converge at one point, i.e. at the output link center. The entire mass is concentrated in the output link (working body). In turn, entire elasticity of this mechanism is determined by the linear actuators. Dependence between the oscillation frequency and the initial conditions could be of interest. By setting the output link initial position closer or farther from the equilibrium point, different laws of the output link motion could be obtained. In particular, the specified link is able to pass through singularity. By changing the output link initial position height, different frequency of the oscillatory process could be received. Thus, there appears a dependence of the oscillation frequency on the amplitude.
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