Minimizing the Average Axis Drift of Double Cross-Axis Flexural Pivots
Keywords:
Cross-axis flexural pivot, double cross-axis flexural pivot, chained beam constraint model, axis driftAbstract
A compliant revolute joint achieves its rotational DOF through the deflections of its flexible members, thus completely eliminates clearance and friction between connected parts. Various compliant revolute joints have been created using notch and leaf spring primitives, including but not limited to cross-axis flexural pivots, cartwheel flexures, and trapezoidal flexures. Although compliant joints offer superior operating characteristics, most of them undergo imprecise motion referred to as axis drift. By using the analog of the design of double parallel-guided mechanism for translation shift elimination, this work proposes a double cross-axis flexural pivot that connects two cross-axis flexural pivots to eliminate the axis drifts by each other. A kinetostatic model is developed, based on which a double cross-axis flexural pivot is modeled. Axis drift of the double cross-axis flexural pivot with different connection angles are discussed. The optimal connection angles for different rotation ranges are obtained. The design results are verified by those of a nonlinear finite element model.
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