Acoustic calculation

What is acoustic calculation?

We are talking about special design work that is carried out using computer technologies and modeling. Based on the results of the work, a list of requirements and recommendations for finishing a specific object with specialized building materials is formed. The parameters and technical characteristics of the premises are necessarily taken into account.

To be more specific, the recommendations contain detailed information regarding the type of building, its area, the number and presence of entrance groups and even curtains, as well as methods for installing building materials and decor that affect sound permeability.

Main tasks

When constructing residential, administrative or industrial buildings, noise is always one of the objects of attention, especially if a high-rise or shopping center will be erected in a metropolis with a metro and active traffic flow.

All noises are divided into acoustic (vibration of particles in different environments) and radio-electronic. To carry out the calculation, the main goals are formed:

1. Determine the degree of noise, if there is data on its source and main characteristics.

2. Select the optimal formula and tools to help reduce the noise level.

3. Select methods and materials that will help achieve the desired results in increasing sound permeability indicators.

Based on their goals, the main task can be set - to perform a calculation for a specific structure in such a way that the negative impact of noise effects inside the object is minimal.

Stages of the calculation

After receiving all the initial data regarding noise sources and their specificity, special measures or tools are developed to solve the problem of excessive noise and design a real estate object based on general requirements. To prepare the design, it is necessary to strictly adhere to the list of measures corresponding to the following stages:

data collection (detection of sound sources, their nature, specificity and characteristics);

analysis of key parameters of the building (its shape, echo level or probability of its occurrence, presence of errors in construction technology or weakened structures);

selection of interior items and furniture that perform a sound-absorbing function;

direct acoustic calculation (selection of calculation points based on the area of ​​the building, its purpose; summation of all sources by level and specificity of sound);

comparison of the obtained data with current sanitary standards;

creation of a project to improve noise insulation and its sound permeability.

Most of the stages take place in a computer program, but the final result and the effectiveness of all measures aimed at reducing sound vibrations and noise insulation depend on the initial stage (collection and analysis of initial data).

How is acoustic design implemented?
The project is based on the use of special tools to optimize reverberation, which affects the intelligibility of sounds, the appearance of hum, "bass" or its distortion in any way.


In 70% of cases, designers encounter a "fluttering echo", which is accompanied by unpleasant and sharp overtones. Designers encounter this situation both in shopping centers, large office areas and even premises allocated for artistic leisure. Optimization of all negative sound moments significantly improves the acoustics of almost any sound system, transforming its real potential and the quality of the output sound.


The rules and requirements are regulated by a set of technical standards - DBN B.1-31-35 with a note on industry standards and operational specifics. The design is implemented based on its main stages, and is carried out according to the following algorithm:


identification of noise sources and their characteristics with modern devices and technological programs;
measuring key physical and sound characteristics of the building;
calculating individual sources and noise levels, summing up the indicators to create a single noise interference system;
calculating the minimum, optimal and maximum permissible noise levels based on sanitary requirements and DBN standards;
creating a computer model of the object indicating multi-colored noise flows;
selecting universal tools for construction and design impact to normalize the noise level;
calculating the effectiveness of the proposed measures and determining the quality of the tools;
measuring the noise level after implementing all solutions for protection against sound permeability;
drawing up the corresponding passport of the object.
Not every construction company can carry out a correct acoustic calculation, since knowledge in the field of industrial and civil engineering alone is not enough for this. If the noise level causes discomfort and distorts sounds, then you cannot do without a special calculation performed by professionals.


Key indicators that must be present
When applying for documentation regarding the noise parameters of a particular room, the client must understand what exactly he will receive as a result. There are certain characteristics that must be calculated under any circumstances, namely:


soundproofing of the main elements of the structure (walls, partitions, ceilings, ventilation systems or air conditioning);


sound absorption intensity (furniture and its material, the presence of additional doors or windows, ventilation ducts, soft decor and textiles, curtains);


external and internal vibration insulation of the building, as well as technical equipment.


At the initial stage, all mandatory measurements are taken, because then it will no longer be possible to make any changes to the interior, to the layout of the object. According to the approved standards of DBN and GOST, a special passport is required for a number of buildings and structures. The list includes multi-storey buildings and residential complexes, sanatoriums and hotels, schools and universities, sports and assembly halls, offices and shopping centers, night clubs and theaters, as well as many other objects.


A specialist such as an acoustic engineer is responsible for the work. It performs all the necessary measurements, and then models the room on the computer, and generates a calculation.


Input parameters for calculation
For a comfortable stay in the building, it is necessary to achieve noise sound at the level of perception of octave frequency bands: 125 Hz, 500 Hz and 2000 Hz. The level of constant noise is calculated based on the SPL and SLM, which have threshold values: SPL - 2 10 N / m, SLM - 10 W, and the perimeter of oscillation of sound waves is also taken into account. SPL and SLM are determined by established formulas, using correction factors. The following points are taken into account as input parameters:


drawings and layout;
layout diagrams;
maximum sound level;
equivalent continuous sound level;
parameters of elbows, air ducts, control valves and other key points;
air circulation rate;
air circulation rate;
noise characteristics of installed machines or external noise sources;
thickness of the walls, their material, presence of additional soundproofing elements on windows, doors, external or internal insulation;
location of the object on the city map and its proximity to direct sources of noise.
Special soundproofing materials for interior and exterior finishing
Soundproofing is a serious problem and if it is necessary to achieve high quality acoustics, then the choice of facing material must be approached with special attention. In most cases, the need for increased soundproofing in residential buildings arises when the construction technology is violated or the walls are too thin. If we are talking about sports or dance halls, cinemas or shopping malls, then the reasons for the noise are completely different. The most popular and affordable facing materials are:

• foam rubber, which corrects high and medium frequencies, reduces reverberation;

  
  

  panels used to control sound vibrations and reverberation;

  
  

  macsound, which help absorb and reduce noise;

  
  

  ceilings, which remove excess noise coming from above the room or building.

  
  

  Upon completion of the work, the customer company receives an acoustic passport, which reflects the current data on the level of noise insulation, sound insulation and reverberation.

  
  

  Our offer

  For more than ten years, we have been offering acoustic design services for objects of varying complexity on the market. Our guarantees are vast experience in solving complex problems, a powerful technical and material base, excellent specialists.

  
  

  By ordering a service from us, you will receive not only a reliable calculation, but also all accompanying documents. The use of modern technologies and computer programs allows you to speed up the process of preparing the necessary recommendations.