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Related Concept Videos

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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Galvanometer01:24

Galvanometer

Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
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Dynamic Modulus of Elasticity of Concrete01:16

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Motional Emf01:22

Motional Emf

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Magnetic Force On Current-Carrying Wires: Example01:22

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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

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The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...

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Magnetic Adjustment of Afterload in Engineered Heart Tissues
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A Wireless, Passive Load Cell based on Magnetoelastic Resonance.

Brandon D Pereles1, Thomas Dienhart, Thadeus Sansom

  • 1Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931, USA.

Smart Materials & Structures
|July 14, 2012
PubMed
Summary

This study presents a novel wireless, battery-less load cell using a magnetoelastic strip. Its force sensitivity is controllable by adjusting the load applicator, offering a unique sensing solution.

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Traditional load cells often require wiring and power sources, limiting their application in certain environments.
  • Magnetoelastic materials offer unique properties for sensing applications due to their response to magnetic fields and mechanical stress.
  • Developing wireless and passive sensing devices is a key area of research for remote monitoring and harsh environments.

Purpose of the Study:

  • To design and fabricate a wireless, battery-less load cell.
  • To investigate the relationship between applied load and the resonant frequency shift of a magnetoelastic strip.
  • To explore methods for controlling the force sensitivity of the developed load cell.

Main Methods:

  • Fabrication of a load cell utilizing a magnetoelastic strip.
  • Excitation of the strip's vibration using an AC magnetic field.
  • Remote detection of the strip's resonance via a secondary magnetic field and a detection coil.
  • Application of mechanical load through a circular rod applicator.
  • Systematic variation of applicator size and position to study force sensitivity.

Main Results:

  • The wireless, battery-less load cell successfully operated based on resonant frequency shift.
  • Applied load caused a decrease in resonant frequency and amplitude due to vibration damping.
  • Force sensitivity was demonstrably controlled by altering applicator dimensions and placement.
  • Increased force sensitivity was observed with larger applicators positioned near the strip's edge.

Conclusions:

  • A novel wireless, passive load cell based on magnetoelastic resonance was successfully demonstrated.
  • The device's force sensitivity can be tuned by mechanical design, offering flexibility in application.
  • This technology presents a promising alternative for wireless force sensing in various fields.