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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.
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...
Wood Panel Products01:18

Wood Panel Products

Wood panel products are essential materials used in construction for applications such as flooring, siding, and roofing, typically available in standard dimensions of 4 feet by 8 feet, with thicknesses varying from one-quarter of an inch to one and one-eighth inches. Among the most common types of wood panels is plywood, which is produced by gluing multiple layers of thin wood veneers under pressure. The grain of the outer veneers runs lengthwise, while the grains of the interior layers run...
Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
Types of Damping01:20

Types of Damping

If the amount of damping in a system is gradually increased, the period and frequency start to become affected because damping opposes, and hence slows, the back and forth motion (the net force is smaller in both directions). If there is a very large amount of damping, the system does not even oscillate; instead, it slowly moves toward equilibrium. In brief, an overdamped system moves slowly towards equilibrium, whereas an underdamped system moves quickly to equilibrium but will oscillate about...
RLC Circuit as a Damped Oscillator01:30

RLC Circuit as a Damped Oscillator

An RLC circuit combines a resistor, inductor, and capacitor, connected in a series or parallel combination.
Consider a series RLC circuit. Here, the presence of resistance in the circuit leads to energy loss due to joule heating in the resistance. Therefore, the total electromagnetic energy in the circuit is no longer constant and decreases with time. Since the magnitude of charge, current, and potential difference continuously decreases, their oscillations are said to be damped. This is...
Concept of Resonance and its Characteristics01:19

Concept of Resonance and its Characteristics

If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not immune...

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An electromechanical low frequency panel sound absorber.

Daoqing Chang1, Bilong Liu, Xiaodong Li

  • 1Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China. changdq@mail.ioa.ac.cn

The Journal of the Acoustical Society of America
|August 17, 2010
PubMed
Summary

This study investigates sound absorption using micro-perforated plates (MPP) with piezoelectric materials and shunt damping. Tuning electrical circuits significantly enhances the sound absorption capabilities of these novel acoustic materials.

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Area of Science:

  • Acoustics
  • Materials Science
  • Electrical Engineering

Background:

  • Micro-perforated plates (MPP) are effective sound absorbers.
  • Piezoelectric materials offer tunable damping properties.
  • Integrating these technologies presents opportunities for advanced acoustic solutions.

Purpose of the Study:

  • To investigate the sound absorbing properties of a thin micro-perforated plate (MPP) coated with piezoelectric material.
  • To develop and validate a theoretical model for predicting sound absorption coefficients.
  • To explore the impact of shunt damping technology on acoustic performance.

Main Methods:

  • Development of a theoretical model for sound absorption prediction.
  • Extension of the model to include micro-perforations and piezoelectric materials.
  • Experimental validation using an impedance tube for acoustic measurements.

Main Results:

  • The theoretical model accurately predicts sound absorption coefficients.
  • Measurements show good agreement with the theoretical predictions.
  • Significant improvements in sound absorption were achieved by tuning electrical circuits.

Conclusions:

  • The combination of MPPs and piezoelectric materials with shunt damping is a viable strategy for enhanced sound absorption.
  • The developed theoretical model provides a reliable tool for designing such acoustic systems.
  • Tunable electrical circuits are crucial for optimizing the acoustic performance of these devices.