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Related Concept Videos

Mechanical Systems01:22

Mechanical Systems

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Mechanical systems are analogous to to electrical networks where springs and masses play similar roles to inductors and capacitors, respectively. A viscous damper in mechanical systems functions similarly to a resistor in electrical networks, dissipating energy. The forces acting on a mass in such systems include an applied force in the direction of motion, counteracted by forces from the spring, a viscous damper, and the mass's acceleration. This interplay of forces is mathematically...
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Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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Electro-mechanical Systems01:19

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Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
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Deformation in a Circular Shaft01:10

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One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
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Updated: Sep 13, 2025

Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects
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A Piezoelectric-Actuated Variable Stiffness Miniature Rotary Joint.

Yifan Lu1, Yifei Yang1, Xiangyu Ma1

  • 1State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China.

Materials (Basel, Switzerland)
|July 30, 2025
PubMed
Summary

This study introduces a miniature rotary joint with adjustable stiffness using piezoelectric actuation. The novel design offers a compact, lightweight, and fast-responding solution for deformable mechanisms in industrial applications.

Keywords:
actuationminiaturepiezoelectricrotary jointvariable stiffness

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Area of Science:

  • Mechanical Engineering
  • Robotics
  • Materials Science

Background:

  • Deformable mechanisms are increasingly vital in industrial applications, requiring adaptable components.
  • Joint stiffness critically impacts the performance and reliability of these mechanisms.
  • Existing variable stiffness joints lack miniaturization, lightweight design, and rapid response capabilities.

Purpose of the Study:

  • To propose a novel piezoelectric-actuated variable stiffness miniature rotary joint.
  • To address limitations of current designs in terms of size, weight, and response speed.
  • To enable enhanced environmental adaptability and system safety in deformable mechanisms.

Main Methods:

  • A piezoelectric stack drives stiffness adjustment by altering pressure and friction between components.
  • A flexible hinge mechanism amplifies displacement for effective stiffness control.
  • A strain-based torque sensor is integrated for real-time load monitoring.

Main Results:

  • A static model validated the stiffness adjustment scheme through simulations.
  • Analysis confirmed the influence of piezoelectric actuation and external load on stiffness.
  • Experimental results demonstrated successful stiffness adjustability and sensor calibration.

Conclusions:

  • The developed joint meets requirements for miniaturization, lightweight construction, and fast response.
  • The integrated sensor provides real-time monitoring of the joint's loading state.
  • This innovation enhances the safety, reliability, and adaptability of deformable mechanisms.