TagSteve Alverson(2)

• Welcome/Review of the Syllabus 9:00 – 9:10 am • Module 1: Principles of Aviation Noise 9:10 – 9:45 am • Module 2: Quantifying Aircraft Noise 9:45 – 10:30 am • 10-minute Break • Module 3: Aircraft Noise Regulations and Guidance 10:40 – 11:10 am • Module 4: Principles of Aircraft Noise Control 11:10 – 11:45 am • Wrap-up and Final Questions 11:45 – 12:00 pm Noise 101 Symposium City of SeaTac Port of Seattle Noise 101 Symposium Principles of Aviation Noise Presented by: Steve Alverson, ESA January 12, 2019 Principles of Aviation Noise Copyright 2019 Environmental Science Associates Principles of Aviation Noise • Acoustic principles • Propagation of sound • Noise metrics • Rules of thumb Principles of Aviation Noise Copyright 2019 Environmental Science Associates Acoustic Principles • Sound can be described in terms of its amplitude (pressure) and frequency (pitch) – Amplitude is a direct measure of the magnitude of sound without consideration for other factors that may influence the perception of it – Frequency is expressed as Hertz (Hz) or cycles per second Principles of Aviation Noise Copyright 2019 Environmental Science Associates Acoustic Principles • Amplitude – Sound pressure ranges are very large, therefore expressed on a logarithmic scale – The logarithmic scale compresses the wide range in sound pressures to a more mathematically useable range – Standard unit of measurement is the decibel (dB) Principles of Aviation Noise Copyright 2019 Environmental Science Associates The Decibel Scale Source: U.S. EPA Principles of Aviation Noise Copyright 2019 Environmental…

An introduction to airport noise, DNL65 and Part 150 by Mr. Steve Alverson of ESA – the firm used by the Port of Seattle for the current Part 150 Study and SAMP