http://www.machacoustics.com/PDFs/CPDs/P10-Acoustics

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)

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Sound Loudness (100-101)

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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

Presented by Ze Nunes of MACH Acoustics 25 Bishop Road, Bishopston, Bristol, BS7 8LS ze@machacoustics.com mobile 07730590904

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