GENERAL PRINCIPLES IN ACOUSTICS FOR ARCHITECTURAL DESIGN

Presented By :

Amit K. Sharma (11110212)

Tanmay Sen (111110222)

ABSTRACT

The Current presentation aims at marking the principles and factors affecting the acoustical comfort for a building. Certain architectural measures are to be determined which will provide possible solutions to the acoustical problems in design.

The Two Factors

REVERBERATION

SOUND REFLECTION

Reverberation

Reverbaration refers to the decay of sound over timeCould be utilized by creating buffer zones between residences and noise creating areas.

Measures in site planning

Several measures can be implemented in site planning to ensure acoustical comfort. Both the factors are simultaneously considered in site planning to provide proper acoustical comfort.

Measures in site planning

Trees can be used as effective sound absorbes as well.Providing trees around a complex serves as a good acoustical comforting technique, generally used in public building as hospitals and schools.

Measures in site planning

Buildings are designed as L shaped structures, having shorter sides on the noise zone, minimum openings are provided to screen off the additional penitration of noise.Distances are increased between noise creating areas and residences to screen of the noises by using buffers.

Examples of buffers

Buffer zones can be created in a number of ways, some of them mentioned as follows. . .Parkings.Gardens.Pathways.Artificial water bodies.Dead zones ( store rooms, toilets, etc)

Sound Reflection

Sound travels as material waves, So when it strikes a material surface it either gets reflected, transmitted or absorbed.If a considerable amount of vibrations are reflected off the surfaces or absorbed, then the surfaces create good sound proofing agents.

Materials

Hard materials reflect a considerable amount of vibrations but also transmits some vibrations through them.Soft and porous materials absorb sound vibrations and act as great barriers, still sound waves penetrate through such materials if applied in thin layers.

Sound proofing of walls

To make a wall sound proof two walls are generally used having voids in between.To add to the effect the voids are filled with foam or other such sound absorbing material to add additional protections from sound.Glass acts as good sound proofing agent and is used at openings like doors and windows to completely screen off the vibrations.

Construction measures

Rat trap bonded walls contains voids in between and air acts as great sound insulator, hence are good sound proofing agents.Heavy concreat blocks effectively reflect sound vibrations and hence can be utilized to create acoustically perfect complexes.

Rat trap Bonded wall

Conclusion

In the given presentation the two basic principles related to acoustical designing were discussed namely 1. Reverberation 2. Sound reflection.Various method were plotted using the given principle to create a acoustically sound design.Several materials were said about which are used for creating quality walls with respect to acoustical characters.