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The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
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Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale
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Parallel Mechanisms for Multiscale Motion Using Twisted Wire Actuation: Designing for Microworkspace and Dexterity.

Elan Z Ahronovich1, Joshua H Turner1, Nabil Simaan1

  • 1Department of Mechanical Engineering, Vanderbilt University, Nashville, TN 37235.

Journal of Mechanisms and Robotics
|October 20, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces parallel robots with multiscale motion using redundant kinematics and low-cost twisted wire actuators (TWAs). These robots achieve micro/macro movements, enabling resolutions of a few micrometers for advanced applications.

Keywords:
and control of mechanical systemsdynamicsflexurekinematicsmechanisms and robotsmicromotionparallelparallel robotstwisted wire actuator

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Area of Science:

  • Robotics
  • Mechanical Engineering
  • Mechatronics

Background:

  • Parallel robots offer high precision but often lack multiscale motion capabilities.
  • Achieving both macro and micro-scale movements in a single robotic system presents significant design challenges.
  • Existing solutions for multiscale motion can be complex and expensive.

Purpose of the Study:

  • To explore a novel family of parallel mechanisms capable of integrated micro/macro motion.
  • To investigate the use of twisted wire actuators (TWAs) as a cost-effective solution for micromotion.
  • To develop a task-based design framework for these multiscale robots, considering workspace, dexterity, and resolution.

Main Methods:

  • A kinematically redundant 3RRPR planar parallel robot was used as a case study.
  • Task-based design considerations were applied, focusing on macro/micromotion workspace and end-effector error.
  • The influence of TWAs on micromotion kinematics was analyzed through modeling and experimental studies.
  • Redundancy resolution strategies were explored for smooth transitions between macro and micromotion.

Main Results:

  • The study demonstrated the feasibility of achieving motion resolutions on the order of a few micrometers using low-cost TWAs.
  • Experimental results confirmed that TWAs significantly alter the robot's kinematic characteristics at the microscale.
  • The proposed modeling framework effectively guides design considerations for multiscale parallel robots.
  • The research provides insights into actuator selection and optimal switching thresholds between macro and micromotion.

Conclusions:

  • Composite serial-in-parallel mechanisms with redundant actuation enable effective multiscale motion.
  • Low-cost TWAs are a viable option for achieving high-resolution micromotion in parallel robots.
  • The developed design framework and modeling approach are valuable for engineers designing advanced robotic systems with multiscale capabilities.