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Building accoustics Outside

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... on the usage of the room different maximum indoor noise levels are ... Living room. Living room - facades. 2nd floor. Sleeping parent asigning new levels ... – PowerPoint PPT presentation

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Title: Building accoustics Outside


1
Building accoustics Outside
  • Passive noise protection
  • 24. BImSchV
  • (24 federal act for immission control)

Jochen Schaal
2
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)

3
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)

4
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

5
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) )

6
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)

7
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

8
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.

9
Calculated Results
10
Calculated Results
11
Buildings, exeeding the limits
12
Import of the buildings, exeeding the limits
13
Import of the buildings, exeeding the limits
14
Banatstraße 9
15
Aditional Information
16
The building
17
First flat (eastside)
18
1st floor
19
Living room
20
Living room - facades
21
2nd floor
22
Sleeping parent asigning new levels
23
Children 1
The indoor noise level exceeds the limit!
24
Children 1
The problem is the window and the new ventilator.
We have to increase the transmission loss.
25
Children 1
With the new transmission loss of 47 and 40 dB
the indoor noise level can be reduced to 27 dB.
26
Painting tools
With the painting tools, lines areas and text can
be added.
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