Building accoustics Outside

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Building accoustics Outside

• Passive noise protection
• 24. BImSchV
• (24 federal act for immission control)

Jochen Schaal
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Overview

• Indoor sound to the outside
• VDI 2571 for single values Li - R - 3 or Li - R
  - 6 for caluculations with octaves
• EN 12354-42000 (transmission of indoor sound to
  the outside) The transmission is based on
  different room properties (varies between 0 and 6
  dB), how to treat openings in the surface.
• Outdoor sound to the inside
• 24. BImSchV (Akustik 23) Based on facade values
  and corrections for the noise type the indoor
  values are calculated. Works with single values
• EN 12354-32000 (airborne sound insulation
  against outdoor sound)

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Overview

• Indoor noise calculation, room acoustics
• VDI 3760 adapted and improved to be used also in
  rooms with not rectangular shape. Known
  restrictions, such as room to room and screening
  objects.
• Ramsete capable to solve the sound propagation
  problems in large enclosures, calculates
  different noise levels and also impulse responses
  values.
• Inside (room to room)
• EN 12354-12000 (airborne sound insulation
  between rooms)
• EN 12354-22000 (impact sound insulation between
  rooms)

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24. BImSchV how dos it work?!

• Used in the process of road and railroad planning
  and the noise reorganization
• Based on single values, calculated or measured in
  front of the open window
• Depending on the noise source, different
  correction factors are used to take the reduced
  spectral transmission loss into account (similar
  to the C and Ctr of the EN 12354)
• Depending on the usage of the room different
  maximum indoor noise levels are allowed
• At each facade we can have a different outdoor
  noise level
• The goal is the definition of the transmission
  loss of the windows to fulfill the maximum
  allowed indoor noise level

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What is calculated?

• According to the original act the necessary
  transmission loss RW,res.
• RW,res Lr 10 lg Sg/A E - D (1)
• RW,res resulting transmission loss
• Lr assessment level
• Sg surface of wall seen from inside
• A equivalent absorption area (A 0.8 x base
  area)
• E Correction term for sound source (tram 3
  dB, city streets 6 dB )
• D Correction term for use of room (sleeping
  27 dB(A), office 47 dB(A) )

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What is the meaning?

• D lt S(Lr,i Ei RW,i,j 10 lg Sj) -10 lg
  A (2)
• D allowed interior level (sleeping 27
  dB(A), office 47 dB(A) )
• Lr,i assessment level for facade i
• Ei Correction term for sound source (tram
  3 dB, city streets 6 dB )
• RW,i,j transmission loss for component j on
  facade i
• A equivalent absorption area (A 0.8 x
  base area right now fixed)

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For what another module?

• Only simple situations are able to handle within
  the Expert Table.
• Documentation is not very well possible with the
  Expert Table.
• You can do it with Excel, but

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but

• you have to respect sometimes more than one
  exterior level.
• you prefer a visual interface to select your
  levels.
• you like a clear view over your project.
• you want a library for standard elements.
• you need to document your results as printout.

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Calculated Results
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Calculated Results
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Buildings, exeeding the limits
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Import of the buildings, exeeding the limits
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Import of the buildings, exeeding the limits
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Banatstraße 9
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Aditional Information
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The building
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First flat (eastside)
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1st floor
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Living room
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Living room - facades
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2nd floor
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Sleeping parent asigning new levels
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Children 1
The indoor noise level exceeds the limit!
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Children 1
The problem is the window and the new ventilator.
We have to increase the transmission loss.
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Children 1
With the new transmission loss of 47 and 40 dB
the indoor noise level can be reduced to 27 dB.
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Painting tools
With the painting tools, lines areas and text can
be added.