Acoustic Design - University of Idaho · 3 Room acoustic goals Silence—a monarchy of sound...
Transcript of Acoustic Design - University of Idaho · 3 Room acoustic goals Silence—a monarchy of sound...
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Acoustic Design:
Rooms and Walls
#1 Siting a building in a
favorable acoustic
environment
Sound transmission in a
free field
#2 Designing indoor
spaces for the proper
acoustic environment
Sound absorption and
reflection
#3 Designing adjacent
spaces for acoustic
independence
Characteristics of sound
transmission in materials
Design Activity Acoustic Issue
Rooms & Reverberant Fields
May have 3 fields
…or fewer…
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Live Spaces• reverberant fields dominate
Dead Spaces• Free field dominates
Dead Spaces Neutral Live Spaces
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Room acoustic goals
Silence—a monarchy
of sound
Lecture halls, auditoria,
churches, theatres
Quiet—a democracy
of sound
Libraries, offices,
restaurants, design
studios, lobbies
None—an anarchy of
sound
Factories, grocery
stores, fast food outlets,
indoor swimming pools
Shape Silence Goal Room to match sound projection
Use reflected sound
to enhance
communication…
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Sound Wave Reflecting Angles• Draw a line perpendicular to reflecting surface
• Incoming angle = reflected angle
Billiards—Acoustics analogy
Orientation and shape affect reflection…
Voxman Hall, UIowa, LMN Architects
Sloped Ceilings can add additional reflected sound for those sitting in the back rows—or not.
Kiel Moe
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Echo Prevention• Sound absorption at back wall and back ceiling• Angle ceiling and walls
This room’s beam enables odd
acoustics by amplifying a phone
conversation 30 feet away while
nearby conversations are
drowned-out by white noise.
SURPRISES
Avoid Focusing Sound
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SURPRISE
Focusing
Dome over elevator lobby at UTexas
produces surprising sound levels.
The Sage
–Foster
Marin County Courthouse, Wright
Isolation--tricky
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Petale, an integrated
sound and light control fixture, designed by
Odile Decq in 2015.
Armstrong Ad a few
months later!
Blue Moon Brewing Co., Denver by Roth Shepard
8’ Diameter Culverts
Surprise Creep
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Japanese American Memorial
Washington, DC
Quiz: creep?
Resonance Chambers• Absorption (Hemholtz)
• Projection (Bandshells)
after Vitruvius
Noise Attenuation Strategies(for sites and rooms)➢ Distance➢ Zoning➢ Absorption & Diffusion➢ Isolation➢ Masking➢ Barriers (math lecture)
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Zoning
Zoning:• Strategic openings
Zoning:• Buffering
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Zoning:
Distance—Barriers
Absorption and Diffusion
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Bateson Building
1970s
products
Custom Shapes
Modern
products
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Before sound
absorption and after(Bonus: light diffusion!)
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Other absorbent
materials…
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Pendleton West
rehearsal hall
Absorbs sound!
Café @ the Building Centre, London
Two absorption strategies!
Diffusion
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Prime Root Diffuser
Design of room absorbers and diffusers can be complex…
Admin Aud photo!
Thamesmead Library Project—Arch 454 Spring 2018
Adam Harfman, Adilyne Nolan, & Deona Swager
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Isolation
Isolation--straightforward
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Masking
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Surprise and Synesthesia• Hearing sound as color
Next time…the math…
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