Long-Travel 3-PRR Parallel Platform Based on Biomimetic Variable-Diameter Helical Flexible Hinges.

Area of Science:

• Mechanical Engineering
• Robotics
• Materials Science

Background:

• Growing demand for compact, high-precision micro-nano positioning platforms across various industries.
• Need for enhanced motion range and accuracy in reduced footprints.

Purpose of the Study:

• To propose and validate a novel three-degree-of-freedom (3-DOF) micro-nano positioning platform.
• To achieve high-precision planar motion (X, Y) and Z-axis rotation using a compact parallel mechanism.

Main Methods:

• Design of a three-prismatic-revolute-revolute (3-PRR) parallel mechanism incorporating biomimetic variable-diameter helical flexible hinges.
• Development and validation of kinematic models (forward and inverse solutions) using finite element analysis.
• Fabrication of a prototype and experimental verification of kinematic performance.

Main Results:

• The 3-PRR platform achieved centimeter-level translation along X/Y axes and 35° rotation around the Z-axis.
• Finite element analysis confirmed the accuracy of kinematic solutions.
• Experimental validation showed a maximum displacement error of 9.5% and a superior workspace-to-footprint ratio.

Conclusions:

• The proposed 3-PRR parallel mechanism offers a highly compact and accurate solution for micro-nano positioning.
• The biomimetic helical hinges and direct-drive design contribute to enhanced performance and reduced system size.
• The developed platform demonstrates significant advantages over existing technologies in terms of compactness and motion capabilities.