Engineering Noise Control

Fundamentals and Basic Terminology
Introduction
Noise-Control Strategies
Acoustic Field Variables
Wave Equations
Mean Square Quantities
Energy Density
Sound Density
Sound Power
Units
Spectra
Combining Sound Pressures
Impedance
Flow Resistance

The Human Ear
Brief Description of the Ear
Mechanical Properties of the Central Partition
Noise Induced Hearing Loss
Subjective Response to Sound Pressure Level

Instrumentation for Noise Measurement and Analysis
Microphones
Weighting Networks
Sound Level Meters
Classes of Sound Level Meter
Sound Level Meter Calibration
Noise Measurements Using Sound Level Meters
Time-Varying Sound
Noise Level Measurement
Data Loggers
Personal Sound Exposure Meter
Recording of Noise
Spectrum Analysers
Intensity Meter
Energy Density Sensors
Sound Source Localization

Criteria
Introduction
Hearing Loss
Hearing Damage Risk
Hearing Damage Risk Criteria
Implementing a Hearing Conservation Program
Speech Interference Criteria
Psychological Effects of Noise
Ambient Noise Level Specification
Environmental Noise Level Criteria
Environmental Noise Level Surveys

Sound Sources and Outdoor Sound Propagation
Introduction
Simple Source
Dipole Source
Quadruple Source (Far-Field Approximation)
Line Source
Piston in an Infinite Baffle
Incoherent Plane Radiator
Directivity
Reflection Effects
Reflection and Transmission at a Plane/Two Media Interface
Sound Propagation Outdoors, General Concepts

Sound Power, its Use and Measurement
Introduction
Radiation Impedance
Relation between Sound Power and Sound Pressure
Radiation Field of a Sound Source
Determination of Sound Power Using Intensity Measurements
Determination of Sound Power Using Surface Vibration Measurements
Some Uses of Sound Power Information

Sound in Enclosed Spaces
Introduction
Low Frequencies
Bound between Low-Frequency and High-Frequency Behavior
High Frequencies, Statistical Analysis
Transit Response
Porous Sound Absorbers
Panel Sound Absorbers
Flat and Long Rooms
Applications of Sound Absorption
Auditorium Design

Partitions, Enclosures and Barriers
Introduction
Sound Transmission through Partitions
Noise Reduction vs Transmission Loss
Enclosures
Barriers
Pipe Lagging

Muffling Devices
Introduction
Measures of Performance
Diffusers as Muffling Devices
Classification of Muffling Devices
Acoustic Impedance
Lumped Element Devices
Reactive Devices
Lined Ducts
Duct Bends or Elbows
Unlined Ducts
Effect of Duct End Reflections
Duct Break-Out Noise
Line Plenum Attenuator
Water Injection
Directivity of Exhaust Duct

Vibration Control
Introduction
Vibration Isolation
Types of Isolators
Vibration Absorbers
Vibration Neutralizers
Vibration Measurement
Damping of Vibrating Surfaces
Measurement of Damping

Sound Power and Sound Pressure Level Estimation Procedures
Introduction
Fan Noise
Air Compressors
Compressors for Chillers and Refrigeration Units
Cooling Towers
Pumps
Jets
Control Valves
Pipe Flow
Boilers
Turbines
Diesel and Gas-Driven Engines
Furnace Noise
Electric Motors
Generators
Transformers
Gears
Transportation Noise

Practical Numerical Acoustics
Introduction
Low-Frequency Region
High-Frequency Region: Statistical Energy ANalysis