Acoustic material

description of acoustics materials and types of acoustic materials,.

1. ACOUSTIC MATERIALS ADVANCED BUILDING SERVICES

2. What is acoustics? “a science that deals with the production, control, transmission, reception, and effects of sound.” it is the science of controlling sound within buildings. The first application of architectural acoustics was in the design of opera houses and then concert halls. What is acoustic MATERIALS? An  acoustic  metamaterial is a  material  designed to control, direct, and manipulate sound waves as these might occur in gases, liquids, and solids. Among the materials used for these functions are polyurethane and melamine foams, fiberglass, wood, plastic and synthetic tiles

3. TYPES OF MATERIALS 1.SOUND ABSORBERS 2.SOUND DIFFUSERS 3.NOISE BARRIERS 4.SOUND REFLECTORS

4. 1.SOUND ABSORBERS These sound absorbing acoustical panels and soundproofing materials are used to eliminate sound reflections improve speech intelligibility, reduce standing waves and prevent comb filtering . Typical materials are open cell polyurethane foam, cellular melamine, fiberglass, fluffy fabrics and other porous materials . A wide variety of materials can be applied to walls and ceilings depending on your application and environment. These materials vary in thickness and in shape to achieve different absorption ratings depending on the specific sound requirements

5. ACOUSTICAL FOAM PANELS These acoustical foams are used in a wide variety of applications ranging from Recording and Broadcast Studios to Commercial and Industrial Facilities. Available in Polyurethane or in a Class 1 Fire Rated foam .  These products can be applied directly to walls, hung as baffles or used as freestanding absorbers. STACKABLE FOAM enables you to increase thickness quickly by nesting layers instead of buying incompatible products. TRADITIONAL FOAM PATTERNS Standard patterns include Wedge, Pyramid, Max Wedge for low frequency absorption, Ceiling Baffles, Bermuda Triangle Traps for corners, STACKABLE FOAM TRADITIONAL FOAM PATTERNS

6. CLASS 1 FIRE RATED ACOUSTICAL FOAM are lightweight open cell foams.  Standard patterns include Wedge, Pyramid, Max Wedge, Ceiling Baffles and more. These can easily mount to walls or ceilings. ANECHOIC WEDGES Designed for controlling low frequency sound, these custom manufactured, large foam wedges are used to create acoustic test chambers with no sound reflections CLASS 1 FIRE RATED ACOUSTICAL FOAM ANECHOIC WEDGES

7. 2.WHITE PAINTABLE ACOUSTICAL PANELS have a soft textured appearance. Their sizes are manageable and provide installers the flexibility to mount acoustical panels around existing objects. In addition to reducing echo and reverberation , these acoustical panels are used to create unique designs and patterns. For use in Recording studios, Home Theaters, Offices, Broadcast Facilities, Telemedicine, Conference Rooms, Restaurants, Salons, Coffee Shops, Computer Gaming Systems or anywhere absorption is desired.

8. previously referred to as Respond Panels, are used to reduce echo and reverberation . These panels are manufactured from a rigid high density glass fiber acoustical board and covered with an acoustically transparent fabric. The edges on these decorative wall panels are chemically hardened and offer several edge design choices. These absorbers are suitable for all applications including offices, recording, broadcast, worship facilities, schools, gymnasiums, museums, auditoriums, theaters or any application that requires an acoustical solution. 3. FABRIC WRAPPED PANELS CEILING CLOUDS reduce reflected sound in theaters, restaurants, arenas, shopping malls, convention centers, recording and broadcast rooms CEILING TILES are an excellent choice for a variety of ceiling grid applications requiring high absorption and are available in a variety of finishes. FABRIC WRAPPED CEILING BAFFLES are covered with an acoustically transparent fabric.  Suspend these from ceiling trusses or other supports to reduce reverberation overhead. BROADBAND ABSORBER are used for walls, as corner traps, bass traps and ceiling applications.  Available in half-rounds or quarter-rounds.

9. is a dimensional fabric that offers excellent acoustical properties, unmatched fade resistance , and a fire/smoke retardant Class A rating.   They are resistant to moisture, mildew, rot, bacteria, and is non-allergenic. Lightweight Acoustic Fabric Easy to install Class A Passes Corner Burn Test Available in Many Colors Durable / Abuse Resistant Improves Speech Intelligibility 4. ACOUSTICAL WALL COVERING 5. FIBREGLASS BLANKETS AND ROLLS Quilted Fiberglass Blankets, Rolls & Panel Curtains combine absorption and barrier material for use in areas that require tough, flexible materials and provide a surface that can be wiped clean. These can be great for machine and industrial enclosures and can be hung as temporary acoustical panels. The Quilted Fiberglass Materials are available in panels or in rolls for easy to hang absorption or a do-it-yourself approach.

10. 2. SOUND DIFFUSERS These devices reduce the intensity of sound by scattering it over an expanded area, rather than eliminating the sound reflections as an absorber would. Traditional spatial diffusers, such as the polycylindrical (barrel) shapes also double as low frequency traps. Temporal diffusers, such as binary arrays and quadratics, scatter sound in a manner similar to diffraction of light, where the timing of reflections from an uneven surface of varying depths causes interference which spreads the sound.

11. QUADRA PYRAMID DIFFUSER This diffuser generates a uniform polar response over a broad frequency range using a pre-rotated pyramidal pattern to create sixteen angles of reflection. 2. PYRAMIDAL DIFFUSER This traditional industry workhorse disperses sound uniformly over a broad frequency range. A quick solution to reduce flutter echo.

12. 3. DOUBLE DUTY DIFFUSER These Polycylindrical Diffusers do twice the work. They scatter sound and function as a bass trap. 4. QUADRATIC DIFFUSER A true quadratic residue diffuser designed for uniform broadband scattering and reducing High-Q reflections.

13. 3.Noise barrier Noise barriers are solid obstructions built between roadways and residential areas. These barriers do not block all noise, they only reduce the overall noise level. Effect ive noise barriers typically reduce noise levels by 5 to 10 decibels (dBA). A 10 dBA increase in sound doubles the perceived or apparent loudness of a sound. How Does a Noise Barrier Work? A noise barrier must be tall enough and long enough to block the view of a highway from the area that is to be protected, the "receiver."

14. What Type of Material Is Best for a Noise Barrier? mas o nry wood Mate r ial conc r ete met a l foams

15. 4.SOUND REFLECTORS In order to hear a loud, clear echo, the hearer must also be far enough away from the surface the sound wave is bouncing off of so the sound wave has space to reverberate. Hard Materials A hard, relatively nonporous material, such as concrete, is as dissimilar as possible to the medium the sound waves move through – the air. That dissimilarity keeps the sound wave – which is traveling on or through the air – from seeping through the material’s surface. Since the sound wave can’t seep through the surface, it doesn’t get absorbed within it -- it bounces off, and is reflected back as an echo.

16. HARD MATERIALS NATURAL: ROCKS MAN MADE: CONCRETE AND ASPHALT

17. SMOOTH MATERIALS When a sound wave, which is made up of kinetic energy, collides with a surface, it will release its kinetic energy as heat at the site of that collision. Smooth materials allow relatively few opportunities for small, individual collisions between the surface’s molecules and the sound wave – and therefore less of the sound wave’s energy is converted to heat, and more of it bounces back off of the surface as an echo For eg : glass and metals

18. Acoustics then and now? 1.Materials Used THEN NOW

19. Acoustics then and now? 2. Design and Materials Application Techniques THEN NOW

20. Acoustics then and now? 3.Quality and Durability of Materials Used THEN NOW

21. Acoustics then and now?  4.Materials Functionality in terms of Sound control and Amplification THEN NOW

22. Acoustics then and now?  5.Aesthetics of Materials Used THEN NOW

23. THANK YOU SARTHAK NAIKYA LAKSHYA PATHAK PRADHI SHARMA SHEETAL GUPTA SUWARNA NEPAL ANUSHKA KUSHWAH UROOJ IQBAL