MACH ACOUSTICS
Contents – Acoustics 1 How our ears perceive sound Background Noise Sound Insulation Rooms Acoustics Reverberation Times
Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Sound Loudness (1-128)
Video Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Sound Loudness (100-101)
Video Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Sound Loudness (1-2)
Video Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Why is this Important? What these examples show is that to make a sensible change to a given sound level, the over all sound level must be halved or doubled to be noticeable, therefore: To noticeably improve the sound insulation of a wall, it’s mass must be doubled. Also, to noticeably change the level of a noise source, it’s power must be halved, i.e. to noticeably reduce traffic noise, the number of vehicles need to be halved.
Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Example of this Effect
Video Sound Demo of a 110mm Wall 220mm Wall 440mm Wall Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
Sound Demo of a 220mm Wall 220mm Wall + Render Finish
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Decibels
Video 1 dB increase equates to a 1 unit increase in sound not a doubling in perceived noise level Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Background Noise How our ears perceive sound Background Noise Sound insulation Rooms acoustics Reverberation times
Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Sound Insulation How our ears perceive sound Background Noise Sound Insulation Rooms Acoustics Reverberation times
Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Sound Moves Partitions
Video Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Monolithic Structure solid structures - block work / concrete / glass
Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Monolithic Structure - block work
Doubling of mass adds 6 dB to sound insulation of a wall Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Monolithic Structure - block work Light Weight Block Wall
Dense Block Wall
Video High Levels of Flexibility Poor Sound Insulation Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
Reduced Levels of Flexibility Better Sound Insulation
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Composite Structure – Stud work wall
Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Composite Structure – Stud work wall
Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Composite Structure – Stud work wall Single Stud Wall
Double Stud Wall
Video Low Levels of Flexibility Poor Sound Insulation Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
High Levels of Flexibility Better Sound Insulation
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Flanking Sound Illustration of sound path between two rooms Side Wall 1 Ceiling
Plan
F1
F3
D
D
F2
F4
Section
Floor Side Wall 2
D Direct Sound Path F1, F2, F3 and F4 Flanking Paths through walls, ceilings and floors
Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Flanking Sound
Video Sound Passage via the Wall
Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
Sound Passage via the Floors
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Flanking Sound
Video Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Introduction to Structure Borne Noise
Audio demo Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Sound Moves Through Buildings
Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Contents – BB93 ‘Acoustic Design for Schools’ How our ears perceive sound Background Noise Sound Insulation
Audio demo
Rooms Acoustics Reverberation times
Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Design Targets for Reverberation Time
Recomend RT times 3
2.5
Concert Hall for orchestral music
RT @ 500Hz
Church music 2
Concert hall for light music
Audio demo
Opera Theaters
1.5
Speech Auditoriums
1
0.5
0 0.1
1
10
Room Volume (in thousand cubic m)
Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
100
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Design Targets for Reverberation Time
Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
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Acoustic Absorption Absorbent materials Carpet ceiling tile
Foam Open Celled Foams
Fibrous Materials
Covers
Perforate Metal
Perforate Metal
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Wooden Slats
Cloth Covering
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Creative Forms of Acoustic Absorption
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Creative Forms of Acoustic Absorption
Protec tive metal sheet Perforated 20% open area Mineral wool Perforated wooden door 20% open area
50mm of Mineral Wool Perforated Metal Plate 20% Fee area
Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904
KS O gs BO Ba &
Absorbent Surfac e