Transcript Såhär räknar man med BASTIAN

Calculate sound insulation according to national
codes and guidelines (e.g. BBR)
and EN 12354 (ISO 15712)
using BASTIAN® and the built-in databases
Examples given on how to verify
• airborne and impact sound insulation of walls and floors
• traffic noise insulation of facades, windows and air inlets
2007-08-20
(copyright) Simmons akustik & utveckling ab 2007
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Presentations
1.
BASTIAN examples
•
horisontal insulation from impact and airborne sound
•
vertical insulation from impact and airborne sound
•
facade insulation from traffic noise
2.
Input data, how are the databases constructed ?
3.
Can one rely on calculation results ?
4.
Background to BASTIAN, the standard EN 12354
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Screen in BASTIAN at startup:
1.
Calculate horisontal,
vertical or facade
insulation? Choose!
2. Room dimensions,
click & type !
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First, choose how walls and floors are
attached to each other (types of junction):
3. Double click and
choose junction !
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Choose walls and floors
from the database:
5. Receiving room data are copied from the
source room, may be changed
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Simmons
akustik
& utveckling
ab 2007
4. D-click
and choose
building
element
!
5
Choose floorings, linings
or suspended ceilings:
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6. D-click and choose !
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Ready – read of the weighted results:
• R’w (weighted sound reduction index)
• L’n,w or L’nT,w (impact sound)
• Look at frequency curves of direct
sound path and flanking paths, with %contribution per path
• Look at all kinds of weighted values,
with spectrum adaption terms listed
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7. Read of results !
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Vertical sound insulation
• Calculate large rooms – often leading for airborne sound.
Add small rooms with several heavy walls, often leading
for impact sound
• Scrutinize designed junctions, choose appropriate
models
• Combine different slabs, cast screeds and floorings that
comply with the requirements
– It may be more efficient to change the screed or slab profile or
number of heavy walls than to add a floating floor, or the
opposite…! Keep trying, in a few minutes you have tested a
variety of constructions that comply with the requirements.
• Keep an eye on the main transmission paths, improve on
the main sound leakages before changing the other
constructions.
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Calculate sound indoors from traffic etc
Choose outer wall,
window, door and air
inlet
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Look at partial transmission (%) for each
window, air inlet and wall, as well as outdoor
and indoor sound levels. Calculations are
made in third octave bands, giving an optimal
choice of product. Forget about the C-terms,
this handles it all and gives you the A-levels!
Choose among a variety
of airborne sound
sources. Type spectrum
for vehicles given
according to SS25267
annex D and the Nordic
traffic noise calc. model
NORD2005
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Listen to the traffic sounds as
being indoors yourself
• Choose type of sound source
• Choose relevant Worksheet (wall, window etc)
• Choose type of listening room indoors
• Use A/B-test of 2 worksheets, e.g. to compare
subjective effects of changing windows
The computer attenuates the ”original sound”
outdoors according to the calculated sound
reductions, in each third octave band, and
adds room reverberation. To achieve a correct
listening impression, auralization must be
made at a realistic level just above the
background noise of the room where the
demonstration is made.
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How the BASTIANdatabases are constructed
Manufacturers may now easily advertise their products in
our databases, on the basis of well documented tests or
theoretical investigations.
Sound insulation for a large number of old, generic
constructions have been added with support from the
Swedish research fund SBUF (project 11254)
The databases are distributed quarterly to users in Sweden, Norway,
Denmark, Finland and Island, with updates and new products
In cooperation with DB Akustik and SINTEF Byggforsk
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Step 1 – Advertisement & product data
•
•
•
The manufacturer:
1. Choose products to advertise in the databases, optionally with
support from an acoustic consultant or a laboratory
2. Determine product name designations (names, numbers etc.)
3. Send data for each product, as test protocols or theoretical
investigations, showing airborne and/or impact sound insulation
(-or improvements). We apply some miniumum requirements
on the documentation of the sound properties of the products,
cf. www.bastian.nu, /advertise.
4. Attach a picture file of the product (550x550 pxl, 256 colours)
5. Add a short information (1-2 rows) on the product, web-link to
product sheets or similar for extended information to users
Send all data for audit and input to the database files
New database files are distributed quarterly to >100 users across
all Nordic countries. We, DB Akustik and SINTEF Byggforsk
coordinates the distribution of database files – one input is enough.
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Step 2 – input to the databases
•
•
•
•
These data are entered:
– Category/Product type
– Product designation
– Picture file name (.JPG)
– Sound reduction data, dB
– Norm. impact levels, dB
– Surface weight, kg/m2
– Coincidence freq. fc, Hz
– Thickness, m
Manufacturers are responsible
for their data (we review them)
In case errors are discovered,
updates are distributed without
additional costs
All database versions are stored
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Step 3 – appearance in database chooser
• This is how the
product may
appear when the
users opens the
chooser tool:
• The databases
have products from
many countries. A
filter facilitates use.
• Generic
constructions
added to facilitate
calculations of old
houses, from SAU
(us), Nordtest,
SBUF, NBI or other
open publications.
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Step 4 – how calculations are made
• The users double click on the tables or the
picture. Selectable constructions are then
presented to the user
• BASTIAN then calculates sound insulation
and sound levels with respect to spectrum of
the sound source and level, construction
areas, flanking transmission and the interaction between the constructions
• The manufacturers do not any longer have to
present expected (”realistic”) sound class in
the building using their products, since this is
always related to the inter-action with the
surrounding constructions. Now, the software
takes these precautions.
• All calculations made according to SS-EN
12354, SS 25267/-68 and the building codes
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Are the calculated results reliable?
• Comparisons with >100 field measurements  advice:
- keep at least 1 dB margin to req. in SS 25267/-68
- keep at least 3 dB marginal to older req, and 4-5 dB for
light floors (depends on type of supporting structures)
• Use only products with well documented input data
• Quality of products and construction are critical – errors
and defects are not accounted for in these margins
• Read more at www.byggamedprefab.se,
section Akustikhandboken and Akustikguiden
• Look at our FAQ, common questions and answers at
www.bastian.nu
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BASTIAN version 2.2-2.3 –
more functions, easier to use
Bastian®:
• implements the EN 12354 standards (parts 1-3), which have
revolutionized the building acoustic planning work for consultants
• new models for heavy double walls, e.g. sandwich or brick walls
• complies with building regulations (e.g. BBR)
• databases contain qualified products that fulfils requirements in the
building, which facilitates changes to ”technically equal alternatives”.
This encourages competition among builders, products and systems
• enables estimates of direct sound and flanking transmission, taking
all building parts into account
• Weighted numbers do not tell all the truth…Use auralization – listen
how it sounds in real life, inside the house!
• Now with network access and databases from several countries
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EN-standarder in the BBR regulations
• Building acoustics - Estimation of acoustic performance of buildings
from the performance of elements
– Part 1: Airborne sound insulation between rooms
– Part 2: Impact sound insulation between rooms
– Part 3: Airborne sound insulation against outdoor sound
• Input data are laboratory values or field data of building elements,
determined according to ISO standardised methods, or by
theoretical investigations. We examine all input data prior to
publishing.
• The calculation model utilizes well known statistical models, similar
to ”heat conduction” models. These models are uncertain in the
individual case, particularly at low frequency. The precision is still
acceptable, which is continously investigated by comparison to field
measurements.
• Calculation results are the same weighted numbers as stated in the
Swedish requirements BBR / SS 25267 /-68 (R´w, L´n,w, Cx-terms)
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More information
• About BASTIAN and the databases
– www.bastian.nu
• Download software demo:
– www.datakustik.de
• Read papers (some in Swedish, some in English):
– www.simmons.se, link to ”Böcker&Artiklar”
• Contact:
– mailto:[email protected]
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