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Related Concept Videos

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...
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
Circular Shaft - Stresses in Linear Range01:13

Circular Shaft - Stresses in Linear Range

Consider a scenario where a circular shaft is subject to torque that remains within the boundaries of Hooke's Law, avoiding any permanent deformation. So, the formula for shearing strain is revisited. This formula is multiplied by the modulus of rigidity, and then Hooke's Law for the shearing stress and strain is applied. As a result, the equation for shearing stress in a shaft can be derived.
Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the shaft's...
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.
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Stresses in a Shaft01:18

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The shaft PQ is subjected to a twisting force when equal and opposite torques are applied on either side. A section that cuts perpendicular to the shaft's axis at any arbitrary point R is examined to understand this. When the free-body diagram of the QR segment is analyzed, it reveals the shearing forces exerted by the PR portion onto the QR segment as the shaft experiences twisting.
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Updated: Jul 3, 2026

A Vibrotactile Feedback Device for Seated Balance Assessment and Training
09:13

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Published on: January 20, 2019

Constant radius blade spring suspended bench for vibration isolation.

Koh A Baker1, John Winterflood1, Carl Blair1

  • 1Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav), University of Western Australia, Perth, Western Australia, Australia.

The Review of Scientific Instruments
|July 2, 2026
PubMed
Summary
This summary is machine-generated.

We developed a novel spring-suspended optics bench to isolate sensitive instruments from seismic noise. This passive system significantly reduces vertical motion and horizontal-vertical cross-coupling for high-precision measurements.

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Area of Science:

  • Physics
  • Mechanical Engineering
  • Optics

Background:

  • High-precision scientific measurements require isolation from ambient vibrations, particularly seismic noise.
  • Traditional methods often involve complex active isolation systems or bulky passive setups.

Purpose of the Study:

  • To introduce a passive, spring-suspended optics bench for seismic noise isolation within a tabletop vacuum tank.
  • To design and optimize a novel constant radius of curvature blade spring for enhanced vertical motion attenuation and minimized cross-coupling.

Main Methods:

  • Utilized finite element modeling (FEM) to optimize the geometry of constant radius blade springs for maximum vertical isolation.
  • Experimentally validated the FEM results using a shaker table setup with geophone sensors.
  • Investigated the horizontal-vertical cross-coupling characteristics of the suspension system.

Main Results:

  • The developed suspension bench demonstrated a vertical attenuation bandwidth from 3-90 Hz.
  • Achieved horizontal-vertical cross-coupling below -50 dB within the 7-90 Hz frequency range.
  • FEM analysis indicated that pre-bent blade springs may offer superior cross-coupling performance at higher frequencies.

Conclusions:

  • The passive, spring-suspended optics bench effectively isolates sensitive equipment from seismic noise.
  • The constant radius of curvature blade spring design offers significant advantages in vertical isolation and reduced cross-coupling.
  • Further research into pre-bent blade springs could yield improved performance for specific high-frequency applications.