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Mechanical Engineering UNIVERSITY OF WASHINGTON COLLEGE of ENGINEERING A Community of Innovators Prof. Peter Dahl Acoustics Research in Mechanical Engineering and at the Applied Physics Laboratory Research Areas: Underwater acoustics

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Page 1: Mechanical Engineering UNIVERSITY OF WASHINGTON COLLEGE of ENGINEERING A Community of Innovators Prof. Peter Dahl Acoustics Research in Mechanical Engineering

Mechanical Engineering

UNIVERSITY OF WASHINGTON

COLLEGE of ENGINEERING A Community of Innovators

Prof. Peter Dahl

Acoustics Research in Mechanical Engineering and at the Applied Physics

LaboratoryResearch Areas: Underwater acoustics

Page 2: Mechanical Engineering UNIVERSITY OF WASHINGTON COLLEGE of ENGINEERING A Community of Innovators Prof. Peter Dahl Acoustics Research in Mechanical Engineering

originating from the sedimentoriginating from the water

Underwater Noise from Marine Pile Driving(Co-PIs: Reinhall and Dahl)

Reinhall, P.G., and P. H. Dahl, Underwater Mach wave radiation from impact pile driving: Theory and observation, J. Acoust. Soc. Am., 130(3) 1209-1216, Sep. 2011

Finite element modeling shows wheresound originates: first in the water, then (~ +10 ms) from the sediment

Field measurements (right) from Vashonisland confirm the modeling

Underwater noise frompile driving can harmmarine life

Reducing this noisefirst requires that we understand it

Page 3: Mechanical Engineering UNIVERSITY OF WASHINGTON COLLEGE of ENGINEERING A Community of Innovators Prof. Peter Dahl Acoustics Research in Mechanical Engineering

Transmission Loss Studies in Puget Sound

(PI: Dahl)

Transmission Loss (TL) is a measure of how sound intensity is reduced with increasing distance from its source

TL is used to predict environmentalimpacts of underwater sound fromnoise sources such as pile driving

Whidbey Island

Sound Source

CamanoIsland

TL is displayed (right) using Geographical Information System (GIS) or (below) showing more detail

Page 4: Mechanical Engineering UNIVERSITY OF WASHINGTON COLLEGE of ENGINEERING A Community of Innovators Prof. Peter Dahl Acoustics Research in Mechanical Engineering

Vector Acoustics(PI: Dahl)

Vector acoustics provides a means to exploreunderwater sound in new ways by exploitingacoustic particle velocity

Dall’Osto D.R., P. H. Dahl, and J. W. Choi, Properties of the acoustic intensity vector field in a shallow water waveguide, J. Acoust. Soc. Am., 131 (3) 2023-2035 Mar. 2012

Simulated acoustic field versus depth and range at snapshots in time. Sound source (80 m) is deployed from ship shown at left. Acoustic particle motion and vector intensity can be measured with accelerometers combined with ordinary pressure sensors (a combined sensor)

Particle motion can show the direction of sound--but interferencewhen two acoustic paths intersect causes elliptical motion (time ~117 ms)

time from start of pulse (some segments slowed down) 1480 1510 1540

sound speed (m/s)

seabed

Acoustic particle motion(amplified for display)from sensors atdepths 20 and 50 m


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