Acoustic Treatment Solution of the Technical Room …
135
some of the surfaces with acoustic absorption material, or increase the sound
insulation of the facade wall.
2. Undertake the technical measures at the noise propagation path, to increase noise
attenuation. In the absence of physical space for planting a dense forest trees or
building a mounds, acoustical barrier presents the only option.
3. Undertake the noise reduction measures at the receiver position applying the
acoustic treatment on the receiver facade increasing the sound insulation.
The choice for determining the best strategy from environmental noise reduction
generated by pumping station No. 25 “Mokroluško brdo” in Belgrade has been
influenced by following factors:
• Terrain configuration and the spatial placement of the buildings (noise sources
and receiver);
• Shape, dimensions, and orientation of the technical room in relation to the
nearby residential objects;
• Available financial funds at the investor disposal.
Taking into concern the results that has been gathered by noise-level measurements, to solve a given problem, method of acoustic treatment by applying surface
absorbers of the water pumping station technical room has been chosen. Additional
reason for this decision is the fact that technical room is equipped with a lifting bridge
crane, and due to the lack of the available space, using volume type of absorbers was
not possible.
Task is defined in such a way that by using the available resources, acoustic
treatment of the technical room will be done to reduce the noise levels, in the condition
when all of the water pumps are under the working load. In addition, it was important
to present the results of the acoustic treatment and corresponding noise reduction
using different types of acoustic absorption materials available on the market, and
the economic justification versus results of the selected materials.
3.2 Realization of the Task
To realize the given task, following steps has been made [5]:
• By increasing the absorption coefficient value of the sound energy, absorption
surface of the partition is being increased:
A = S · α
(1)
where A (m
2 ) is partition surface absorption, S (m
2 ) is partition surface, while α
is the frequency defendant absorption coefficient of the material.
• By increasing the absorption coefficient at certain frequency bands, absorption
surface at those bands is also increased, which results in the noise reduction at
the same frequency bands according to equation:
135
some of the surfaces with acoustic absorption material, or increase the sound
insulation of the facade wall.
2. Undertake the technical measures at the noise propagation path, to increase noise
attenuation. In the absence of physical space for planting a dense forest trees or
building a mounds, acoustical barrier presents the only option.
3. Undertake the noise reduction measures at the receiver position applying the
acoustic treatment on the receiver facade increasing the sound insulation.
The choice for determining the best strategy from environmental noise reduction
generated by pumping station No. 25 “Mokroluško brdo” in Belgrade has been
influenced by following factors:
• Terrain configuration and the spatial placement of the buildings (noise sources
and receiver);
• Shape, dimensions, and orientation of the technical room in relation to the
nearby residential objects;
• Available financial funds at the investor disposal.
Taking into concern the results that has been gathered by noise-level measurements, to solve a given problem, method of acoustic treatment by applying surface
absorbers of the water pumping station technical room has been chosen. Additional
reason for this decision is the fact that technical room is equipped with a lifting bridge
crane, and due to the lack of the available space, using volume type of absorbers was
not possible.
Task is defined in such a way that by using the available resources, acoustic
treatment of the technical room will be done to reduce the noise levels, in the condition
when all of the water pumps are under the working load. In addition, it was important
to present the results of the acoustic treatment and corresponding noise reduction
using different types of acoustic absorption materials available on the market, and
the economic justification versus results of the selected materials.
3.2 Realization of the Task
To realize the given task, following steps has been made [5]:
• By increasing the absorption coefficient value of the sound energy, absorption
surface of the partition is being increased:
A = S · α
(1)
where A (m
2 ) is partition surface absorption, S (m
2 ) is partition surface, while α
is the frequency defendant absorption coefficient of the material.
• By increasing the absorption coefficient at certain frequency bands, absorption
surface at those bands is also increased, which results in the noise reduction at
the same frequency bands according to equation: