acoustic resistance
Học thuậtThân thiện
Definition
- Noun:
- Opposition to the flow of sound through a surface: Acoustic resistance is a specific property of a material or boundary that dissipates sound energy as it passes through or is reflected. It represents the real, in-phase component of the more complex measurement known as acoustic impedance.
Usage
- Acoustic resistance is a key parameter in acoustical engineering and architectural design for controlling sound transmission and absorption.
- It is used to quantify how effectively a material or structure resists the passage of sound energy, converting it into a small amount of heat.
- This term is primarily technical and is used in fields like audio engineering, noise control, and the design of acoustic materials (e.g., foams, panels).
Examples
- Noun:
- The acoustic resistance of the heavy curtain significantly reduced the noise from the street.
- Engineers measured the acoustic resistance of the new composite material to evaluate its suitability for the studio wall.
- A higher acoustic resistance generally means better sound insulation properties.
Advanced Usage
- Real Component of Acoustic Impedance: In technical contexts, acoustic resistance is explicitly defined as the real part (R) of the complex acoustic impedance (Z = R + iX), where the imaginary part (X) is the acoustic reactance. This opposition is responsible for the irreversible absorption of sound energy.
- Specific Acoustic Resistance: Sometimes referred to as the resistance per unit area, with units of Rayls (Pa·s/m).
Variants and Related Words
- Acoustic Impedance (n): The total opposition a medium presents to the acoustic flow, combining both resistance (real part) and reactance (imaginary part).
- Acoustic Reactance (n): The imaginary component of acoustic impedance, representing the opposition due to the inertia or elasticity of the medium, which stores and releases sound energy rather than dissipating it.
- Sound Absorption Coefficient (n): A related metric that describes the fraction of sound energy a surface absorbs, which is influenced by its acoustic resistance.
Synonyms
- Acoustic Resistivity (when considered as a material property per unit thickness).
- Sound Resistance (a less technical, more general term).
Related Phrases
- To offer acoustic resistance: To provide opposition to sound flow.
- The dense foam offers considerable acoustic resistance.
Noun
- opposition to the flow of sound through a surface; acoustic resistance is the real component of acoustic impedance and acoustic reactance is the imaginary component