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Kocyigit Construction Electric Co.,Ltd.
General ManagerCONSTRUCTION, ELECTRICAL, ACOUSTIC AND AUTOMATION WORKS :
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PROJECT: FACTOR EFFECT OF FREQUENCY BAND FOR NOISE CONTROL; CASE STUDY FROM KIZILAY STATION :
Recently, it has been understood that to maintain noise control using one-value dB is handicapped and the studies has been started to use noise control curves aiming to take precautions for the problems due to frequencies. As to the architecture, the studies are not sufficient on this subject. Especially for the special buildings, which have tight relations between disciplines, it is necessary to analyse frequency bands in order to control noise due to frequency.
Special systems, which are established by bringing different disciplines together, called special buildings. In these buildings that have special identities, sound is also part of the system and needs acoustic appropriate with the identities. Today, the grouped of building according to noise sensitivity is getting importance. Frequency band analysis of buildings is important, for the grouping into the groups. Here we will deal with only the importance of frequency band analysis in special building.
In this study, Kizilay station was taken as an example of special buildings and frequency analysis were done and noise criteria for interior are proposed. When the test result compared against the criteria, serious problems were found at 500 1000 Hz. frequencies on Saturday and Mondays.
Every sound can be noise with respect to time, usage or personality. Nowadays, limits of noise studies are improving and acceptable noise limits are adapted to the people life style and comfort and special building automation. Here, noise control will be deal with the frequency band analysis into two way. First way is, grouping rooms according to usage and sensitivity. Second way is the controlling acceptable noise limits according to frequency band analysis with the help of NC and NR curves.
1.) Especially in the special buildings, noise control studies are depended on intensity and frequency. Special buildings are divided into 4 groups (Kocyigit, F. B. Doctorate Thesis 2003, Ankara, Turkey). AG1(Acoustical Group) is the group of Special Buildings, which main function is directly related with sound. At AG2; main function of the building is used as warning and orientation. For AG3; sound is considered as an ambient noise. AG4 are high sensitive area for sound. Need special techniques for control. Here frequency bands analysis for noise control is very important.
Initially, special buildings can be divided into two groups according to acceptable noise limits. First group is Sound Acceptable Area (SAA). includes AG1 and AG2. Concert Halls, show rooms, religious buildings are in the SAA-AG1. Second group is Sound Unacceptable Area (SUA), includes AG3 and AG4. Socially sensitive areas such as hospitals, schools etc. are in the SUA-AG3. Sensitive areas in terms of sound control are telecommunication studios, Audiology rooms, and high technology areas, clever buildings are special buildings which in the group of SUA-AG4. So architectural and interior design are directly effected by the sound source and frequency bands analysis for sound control.
2.) Many special buildings have big and acoustically conflict area. They have several corridors, entrance to open different characteristic area and so on which create difficulties to the principle of room acoustics. Additionally there are to many sound sources. If special buildings are also public areas, there are to many different types of frequencies. These can be from machines, direct communication with people or communication from announcements.
One of the another acoustical problems is the acoustical image, which have reflected characters on the walls, ceiling and floor. The reasons for these problems are; a) serve to the mass of people in the city, materials subjects to frequent use must be hard and durable, b) several different geometry like corridors, open spaces c) different frequency sound which coming with fluctuating effect from other end of corridors. All these problems effect the control of sound in the special buildings.
Filiz Bal KOÇYİĞİT