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Related Concept Videos

Active Filters01:25

Active Filters

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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Passive Filters01:27

Passive Filters

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
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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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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

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In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Rolling contact bistable passive and active metamaterials.

Mohammad Naghavi Zadeh1, Fabrizio Scarpa2, Jonathan Rossiter1

  • 1School of Engineering Mathematics and Technology (SEMT), University of Bristol, Bristol BS8 1TW, UK. jonathan.rossiter@bristol.ac.uk.

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Summary

This study introduces a novel metamaterial with rolling beams, offering enhanced force density and durability for actuators and shock absorbers. These materials demonstrate stable switching and large strain capacity, overcoming limitations of previous designs.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Metamaterials

Background:

  • Negative stiffness and bistability are crucial for advanced actuators and energy dissipation.
  • Existing mechanisms struggle to balance large strain capacity, high force density, and fatigue life due to plastic strain accumulation.

Purpose of the Study:

  • To develop a new class of metamaterials with rolling flexible beam deformation for improved mechanical properties.
  • To enable control over strain responses in architected materials, offering high force density and stable switching.

Main Methods:

  • Tensile tests and finite element analysis were employed to examine the elastic properties of the metamaterials.
  • Electroactive rolling versions were evaluated using dielectrophoretic liquid zipping actuation.

Main Results:

  • Metamaterials with rolling beams demonstrated negligible changes in force-displacement response after over 10,000 cycles.
  • The rolling mechanism facilitated both linear and rotational motions, showcasing power amplification through snapping.

Conclusions:

  • The proposed rolling contact metamaterial mechanism overcomes limitations of traditional designs, offering superior performance.
  • This innovation has wide potential applications, including drone perching mechanisms and rapid-response grippers.