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Related Concept Videos

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Stability of structures

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In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
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Extracting the Young's Modulus of Native Murine Pulmonary Basement Membranes from Atomic Force Microscopy Derived Force Maps
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Dynamically variable negative stiffness structures.

Christopher B Churchill1, David W Shahan1, Sloan P Smith1

  • 1HRL Laboratories LLC, Malibu, CA 90265, USA.

Science Advances
|March 19, 2016
PubMed
Summary

Engineered structures now feature dynamically tunable stiffness using negative stiffness principles. This novel approach enables efficient load-bearing and vibration isolation for robotics and adaptive systems.

Keywords:
Vibration isolationimpedance controlnegative stiffnessnonlinear structures

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Area of Science:

  • Robotics and Mechanical Engineering
  • Materials Science

Background:

  • Mammalian musculoskeletal systems exhibit variable stiffness for efficient function, a trait rare in engineered systems due to complexity and cost.
  • Conventional tunable stiffness structures face limitations like small stiffness change, high friction, and high power requirements.

Purpose of the Study:

  • To introduce a novel negative stiffness-based structure with dynamically tunable stiffness.
  • To demonstrate a system capable of fast and significant dynamic stiffness control using simple hardware and low power.

Main Methods:

  • Configuring a negative stiffness structure with an active component for dynamic stiffness changes.
  • Utilizing low-power, low-frequency actuation for stiffness control.
  • Experimental demonstration of actively tunable vibration isolation and load-independent stiffness tuning.

Main Results:

  • Achieved fast (<10 ms) and substantial (>100×) dynamic stiffness control.
  • Mitigated limitations of conventional tunable stiffness systems.
  • Demonstrated tunable vibration isolation and stiffness tuning independent of supported loads.

Conclusions:

  • The developed negative stiffness-based structure offers a viable solution for creating adaptable and efficient load-bearing systems.
  • This technology enhances applications like humanoid robotic limbs and lightweight adaptive vibration isolators.