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    Noise Control of Buildings

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    saswat ranjan pattnaik

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    © All Rights Reserved
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    Noise Control of Buildings

    Uploaded by

    saswat ranjan pattnaik
    8 views20 pages

    Original Title

    NOISE CONTROL OF BUILDINGS

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    © © All Rights Reserved

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    Copyright:

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    Download as pptx, pdf, or txt
    8 views20 pages

    Noise Control of Buildings

    Uploaded by

    saswat ranjan pattnaik

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 20

    SEMINAR ON NOISE CONTROL

    OF BUILDINGS

    presented by- Saswat Rajan Pattnaik


    B-Tech in
    Department of Civil Engineering
    CONTENTS

    ⚫ Introduction
    ⚫ Noise and Health
    ⚫ Ways to Control
    ⚫ Methods to control
    ⚫ Room Acoustic
    ⚫ Wall Construction
    ⚫ Floor construction
    ⚫ Space Planning
    ⚫ HVAC and Elevator soundproofing
    ⚫ Residential Sound Control Practices
    ⚫ Conclusion
    ⚫ References
    INTRODUCTION

    ⚫ Century of development and immense noise.


    ⚫ 24/7 surrounded by noise and sound.
    ⚫ Principle: conversion of disturbances into electrical
    potentials which brain can sense.
    ⚫ Noise from outdoor as well as within the house.
    NOISE : UNWANTED SOUND
    ⚫ Noise can impede speech communication.
    ⚫ Solution can be noise control.
    NOISE AND HEALTH
    Regular exposure to noise
    may include various physical
    and psychological heath
    consequences including:
    ▪ Hearing Impairment
    ▪ Tinnitus
    ▪ Hypertension
    ▪ Ischemic heart disease
    ▪ Annoyance
    ▪ Sleep disturbances
    ▪ Harm to Immune System
    ▪ Birth defects
    ▪ Icreased incidence of diabetes
    BASICS

    ⚫ Principle of hearing: conversion of physical disturbances in to


    electrical potentials which brain can sense
    ⚫ Listerner’s ear recieve sound directly and indirectly( i.e
    reflection from several surfaces).
    PARAMETERS

    Building materials are generally Sound Transmission Class (or


    rated by their noise reduction STC) is an integer rating of how
    well a building partition attenuates
    coefficient (NRC).
    airborne sound.
    WAYS TO CONTROL

    ● Three BASIC ways to control noise


    1. Replace the sound source with a quieter one.
    2.Block the sound with a solid, heavy material that resists
    the transmission of sound waves.
    3.Absorb the sound with a light, porous material that soaks
    up sound waves.

    Acoustical design issues for buildings include site


    noise considerations, control of noise transfer,
    establishing noise standards, room acoustics
    considerations, sound isolation, vibration control
    and audio/visual considerations
    METHODS

    SOUND ABSORPTION SOUND INSULATION

    ⚫ It is the capability of ⚫ Through sound barrier


    surface to absorb sound transmission , sound
    is reduced.
    instead of reflecting it.
    ⚫ By increasing wall
    ⚫ Good sound absorbing thickness and isolating
    materials are carpet, one side of construction
    foam, padding and from other.
    ⚫ Methods: Wall
    fiberglass insulation.
    construction,Floor
    ⚫ Method : Room planning,Space Planning.
    acoustics
    ROOM ACOUSTICS
    ROOM ACOUSTICS
    □ We receive direct and
    reflected sound in a room.
    □ Unwanted background
    noise is due to high level of
    reflected sound in poor
    acoustical rooms.
    □ To achieve acceptable
    acoustic characteristics
    various points are taken into
    considerations like:
    1.location and extent of sound
    absorbing materials
    2. reduction of
    reverberation and speech
    interference
    3. Shape of room(for
    libraries)
    Best sound absorption materials
    SOUND ABSORPTION AT WORKPLACE

    Lay in acoustical ceiling Suspended acoustical baffle


    CONT.

    Open cell acoustical foam Quilted sound screen


    WALL CONSTRUCTION

    Standard partition is a
    single stud wall and one
    layer of gypsum bard
    on each side,the
    acoustic performance
    can be improved by
    using light gauge
    metals instead of wood
    studs.
    STC (Sound transmission
    class) is standard J
    parameter to compare
    performance of differenent STC
    construction materials
    SPACE PLANNING

    Space planning deals with


    organizing spaces to
    avoid adverse
    adjacencies of noisy
    equipment like
    mechanical equipments
    and electrical transformer
    with quiet spaces .
    It can be the most
    cost-effective noise
    control technique.
    F
    L
    O
    A
    FLOOR CONSTRUCTION

    Floor and ceiling provide two


    acoustical function:
    1.provide separation
    between adjacent spaces i.e,
    airborne sound
    insulation
    2.reduce sound of footfalls
    and other impact sounds i.e,
    impact insulation.
    Using a carpet and a pad
    WOOD FRAMED FLOOR
    or a resilient floor
    underlayment improves
    impact insulation.
    HVAC NOISE CONTROL

    PROBLEMS SOLUTIONS

    1. Fiberglass duct liner, designed for


    not acoustically treated, noise from
    installation inside sheet metal ductwork
    heating, ventilating, and
    to attenuate air rush and central
    air-conditioning equipment can travel
    equipment noise as well as to control
    from room to room in the home or in
    heat loss or gain through duct walls.
    the office.
    2. Fiberglass duct board, combining
    acoustical/thermalinsulation with a
    Noise produced by fansand motors of reinforced foil-kraft air barrier/vapor
    central air equipment can be retarder, from which complete air duct
    transmitted systems may be fabricated.
    throughout the duct system. High air
    velocities in the duct system can
    cause noise-producing
    turbulence.
    Protecting Yourself from Elevator Noise

    Reason Soundproofing

    ⚫ the sound coming ⚫ by simply applying a layer of


    mass loaded vinyl to the
    from cable walls.
    system attached ⚫ A separate wall around the
    to the elevator perimeter of elevator.
    itself.
    ⚫ Increasing air space in a wall
    ⚫ sound coming from
    assembly will also improve
    the elevator shaft –
    isolation
    sound caused by the
    motor and cables.
    Residential sound control PRACTICES

    FIVE NOISE CONTROL MISTAKES TO AVOID

    1. Thinking you don’t have a noise problem.


    2. Not considering noise control before a project is started.
    3. Not conducting a detailed study of noisy equipment.
    4. Not using a systematic approach to noise control.
    5. Not sealing air leaks.
    CONCLUSION

    • Noise is becoming a very big problem day to day it is


    degrading our health and ecological balance as well. And
    one cannot remain untouched with this aspect of day to
    day issue.
    • By introducing noise control in buildings we can create a
    less noisy residential and other constructions. As sound
    travels directly and throughs reflections, so to improve
    sound quality reflections should be minimized.
    REFERENCES

    ● Google.com
    ● Studymafia.org
    ● Wikipedia.org

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