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Related Concept Videos

Magnetic Damping01:17

Magnetic Damping

578
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...
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Vibrating Concrete01:19

Vibrating Concrete

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Mechanical vibrators are instrumental in compacting newly poured concrete within formwork and around reinforcements. This process is essential to eliminate trapped air pockets and establish a dense concrete mass. One widely used method is vibrating by internal vibrators, often referred to as a poker vibrator or immersion vibrator. It is rapidly inserted through the full depth of the freshly laid concrete and slightly extends into the layer below it (which remains in a plastic state). Consistent...
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Updated: Sep 21, 2025

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A Resonant Graphene NEMS Vibrometer.

Daniel Moreno-Garcia1, Xuge Fan2,3, Anderson D Smith4

  • 1Advanced NEMS Group, École Polytechnique Féderale de Lausanne (EPFL), Lausanne, 1015, Switzerland.

Small (Weinheim an Der Bergstrasse, Germany)
|May 31, 2022
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Summary

New graphene-based resonant vibration sensors offer enhanced performance for predictive maintenance. These compact sensors improve structural safety and machine stability, aligning with industrial sustainability goals.

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graphenelaser doppler vibrometrynano-electromechanical (NEMS)resonatorsvibration

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Sensor Technology

Background:

  • Vibration measurement is critical for structural integrity and machine stability.
  • Predictive maintenance, a key Internet of Things (IoT) application, demands efficient and cost-effective sensors.
  • Existing vibration sensors face limitations in footprint and cost, necessitating novel concepts.

Purpose of the Study:

  • To develop novel resonant vibration sensors with reduced footprint and cost.
  • To demonstrate the efficacy of double-layer graphene membranes with suspended silicon proofs for vibration sensing.
  • To explore new sensing effects for nano and micro mechanical resonators.

Main Methods:

  • Fabrication of double-layer graphene membranes integrated with suspended silicon proofs.
  • Utilizing resonant transduction as the primary sensing mechanism.
  • Experimental excitation of nano and micro mechanical resonators using an external shaker.

Main Results:

  • Demonstrated successful operation of graphene-silicon resonant vibration sensors.
  • Achieved outstanding performance metrics relative to sensor footprint and proof mass.
  • Unveiled a novel sensing effect based on resonant transduction.

Conclusions:

  • Double-layer graphene membranes with suspended silicon proofs represent a promising platform for advanced vibration sensors.
  • The developed sensors offer significant advantages for predictive maintenance and structural health monitoring.
  • The findings have implications for research on nano and micro mechanical resonators.