2nd Annual Meeks Memorial Acoustics Workshop
Rose-Hulman Institute of
Technology
Monday June 16, 2008 through
Thursday June 19, 2008
This
workshop is dedicated to the memory of Wilkison W.
Meeks, Professor of Physics at Rose Polytechnic Institute and
Rose-Hulman
Institute of Technology. Dr.
Meeks was a teacher of acoustics, an acoustics researcher, and the
author of an acoustics textbook. The
workshop will be conducted by Michael J. Moloney, longtime colleague
and friend
of Dr. Meeks. Partial support for this workshop comes from funds
provided by
Dr. Meeks' widow and daughters for the encouragement of study and
achievement
in acoustics.
The
main workshop emphasis is on acoustics experiments
which are fairly simple to carry out, and fairly easy to interpret. Each experiment will be
demonstrated, and some theoretical
support will be given for each.
The
workshop
requires that participants bring their own laptop computers. Data will be taken with the
aid of Vernier LabPro interfaces available at Rose-Hulman, interfaced
to
Vernier Logger Pro software. (Vernier Software has kindly agreed to
permit the
use of Logger Pro for the duration of the workshop, if a participant
does not
own it. Such Logger Pro software must be removed at the end of the
workshop.)
Participants
are not obligated to carry out all
experiments. Four days have been allocated, which should allow for
thorough
exploration of all experiments. (Three days may be sufficient for some
participants, depending on their interests.)
The
following experiments will be set up and available
throughout the workshop:
Measure the Q values of a set of
pvc pipes of varying diameter but all having the same resonant
frequency.
Narrow tubes have a low Q due to viscous losses at the wall, radiating
little
from their ends. As tube diameter increases, Q increases to a maximum
and
decreases. This is due to competition between wall losses and radiated
sound
out the ends.
The resonant frequencies of
freely-suspended rods will be measured, both for lateral and
longitudinal
vibrations. Participants are
encouraged to use inexpensive electrical
conduit to build a set of wind chimes if they desire.
There are a number of
simple
and interesting ultrasonic experiments:
·
Lloyd's
mirror, in which a sound source is suspended over a flat surface,
giving the effect of a double source
·
Fresnel
zone plate. This plate is shown to have a gain of about 3.
Participants may wish to cut their own out of cardboard or other stiff
substance.
·
Wavelength
and phase velocity measured using lissajous figures
·
Ultrasonic
double source experiment, where a detector is moved parallel
to the line of two sources.
Helmholtz resonators will be
studied by changing the volume or the neck length. Data can be fitted
and
checked against the theory.
·
pipes
open and/or closed at each end
·
pipes
with holes which can be opened or closed
·
pipes
with one or more side branches
·
Helmholtz
resonators in their higher modes
·
(Relatively
accurate modeling of all these can be done using RK2
numerical integration in a spreadsheet or program, following the ideas
of Ian
D. Johnston)
The
approximate schedule is as follows:
Sunday June 15, 2008 - arrive at Rose-Hulman between 4 and 8 PM, unless staying off campus.
Monday
Morning June 16, 2008 (9AM)
Demonstration
and discussion of Q values of pvc pipes.
Demonstration
and discussion of lateral vibrations of freely suspended bars
Monday
Afternoon June 16, 2008 (1 PM)
Demonstration
and discussion of dispersive waves travelling along a music wire or
slinky
Demonstration
and discussion of the set of short ultrasonic experiments
Tuesday
Morning, June 17, 2008 (9AM)
Demonstration
and discussion of Helmholtz resonators
Demonstration
and discussion of pipes with a sharp change in area
Tuesday
Afternoon, June 17, 2008 (1 PM)
Demonstration
and discussion of Ian Johnston's 1-D model of resonators
(this
handles holes in resonators, side branches, changes of area, etc.)
Demonstration/discussion of RK2
integration used in Excel for
Demonstration
and discussion of using scroll bars (sliders) in Excel to do
'animations'
Wednesday
June18, 2008 and Thursday June 19, 2008
Repeat
any of the earlier demonstrations/discussions as needed
(Any participant who brings a
woodwind instrument is free to numerically model it and compare
to the actual notes of the
instrument.)
____ I
cannot attend a June 2008 workshop but would be
interested in one offered in the future.
There
is a
workshop registration fee of $125.
This is
payable to Rose-Hulman
Institute of Technology (check or credit card)
three weeks prior to the
workshop.
Room
(single or double occupancy in Rose-Hulman dorms)
and board will be provided.
(Some
limited funds are available to help defray travel
and other costs.)
If the
workshop is oversubscribed, strong consideration
will be given to earlier applications with paid registration.
Meeks Memorial Workshop Application
form (June 16-19, 2008)
Email to :
moloney@rose-hulman.edu
Or mail to Dr.
Michael Moloney
Rose-Hulman
Institute of Technology
Participant's
Name
_______________________________________________________
Home
Address
___________________________________________________________
Institution
______________________________________________________________
Email
address (important)_____________________________
Telephone
number _______________________
____ My laptop is
a Mac and I will need a Mac version Logger Pro software for this
workshop.
Please
explain how you expect to benefit, and how your
students will benefit from your taking this workshop.
Payment is
by
_______
Personal check
______ Credit
card
Type of card _____Visa ____
Mastercard ____
Other ________
Name as it appears
on the card
Card
Number
Expiration
date
For
additional information or questions,
Email moloney@rose-hulman.edu
Phone (moloney) 812 877 8302,
(PHOE office) 812 877 8309
FAX (Physics & Optical Eng )
812 877 8023
Additional
comments: