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Related Concept Videos

Stability of structures01:14

Stability of structures

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,...
Mechanical Systems01:22

Mechanical Systems

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 described...
Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
Bending and Torsional Moments01:20

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Bending and torsional moments are two fundamental concepts in structural engineering. They play an important role in understanding the behavior of materials and structures under different loading conditions.
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Torsional Pendulum01:09

Torsional Pendulum

A torsional pendulum involves the oscillation of a rigid body in which the restoring force is provided by the torsion in the string from which the rigid body is suspended. Ideally, the string should be massless; practically, its mass is much smaller than the rigid body's mass and is neglected.
As long as the rigid body's angular displacement is small, its oscillation can be modeled as a linear angular oscillation. The amplitude of the oscillation is an angle. The role of mass is played by the...
Plastic Deformation in Circular Shafts01:20

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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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Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
12:33

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Published on: February 4, 2013

Rod Origami (RodOri) Spring Metamaterials for Tunable Vibration Control via Tailored Structural Instabilities.

Jeseung Lee1, Sophie Leanza1, Ruike Renee Zhao1

  • 1Department of Mechanical Engineering, Stanford University, Stanford, California, USA.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 15, 2026
PubMed
Summary
This summary is machine-generated.

Engineers can now create adaptive structures using reconfigurable springs based on rod origami (RodOri). These programmable springs enable on-demand control of vibration, isolation, and impact mitigation in metamaterials.

Keywords:
mechanical metamaterialsreconfigurable structuresrod origamistructural instabilityvibration control

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Metamaterials

Background:

  • Traditional springs have fixed stiffness, limiting adaptability in vibration control systems.
  • Modern engineering requires adaptable structural components for dynamic environments.

Purpose of the Study:

  • Introduce reconfigurable springs using rod origami (RodOri) for adaptive structural dynamics.
  • Develop a system-level design for multistable metamaterials with programmable dynamic responses.

Main Methods:

  • Constructed RodOri springs from pre-stressed, naturally curved elastic rods.
  • Tailored natural curvature and aspect ratio to program buckling and post-buckling behavior.
  • Assembled multiple RodOri springs into a multistable metamaterial for hierarchical tunability.

Main Results:

  • Demonstrated stepwise structural reconfiguration via sequential snap-through transitions.
  • Achieved on-demand modulation of vibration amplification, isolation, and impact mitigation.
  • Established precise control over resonance frequencies and dynamic responses across stable states.

Conclusions:

  • RodOri springs offer reconfigurable and programmable building blocks for adaptive structural and wave dynamics.
  • This approach enables the design of metamaterials with tunable mechanical responses.
  • Validated through numerical simulations and experimental studies.