|The purpose of this site is to encourage a few people of any educable age to consider studying acoustic and vibration technologies academically. "Good Vibrations" is used to draw attention to the site in the hope that the purpose can be conveyed.|
|If possible, view
this page with|
Internet Explorer or MSN Browser on a machine
with a sound card.
|This page was written by Glenn and reviewed by Nancy Bowie, Red
Preparing acoustic and vibration examples is a particularly enjoyable activity. With today's communication tools, it is possible for me to tutor a student or class at the University from my home laboratory. For example, a simple cantilever beam is mounted horizontally. An electromagnet senses fields generated by means of a pair of magnets that are mounted near the beam tip.
The sound card in a personal computer is a key tool. It is used to record the free vibration signal generated when the beam tip is deflected, then released. The next step is to use the free vibration signal to drive the electromagnet and thus the beam.
Move your mouse pointer from one of the following two small images to the next. Experiment. Get a feeling for the next step: tutorials to be accomplished by means of video phone techniques.
|Use Electromagnetic Driver|
Ten cycles of the free vibration take place in 0.62 second. Find the beam resonant frequency.
|I, Glenn Bowie, studied physical and earth
sciences. Acoustic and vibration technologies are hobbies now. Click the
ring at left and it rings.
More generally, rings are associations of people. In Germany a ring is a Bund, in China a Tong.
|Nancy Bowie wrote fiction and
nonfiction. For example, in 1982 she published an article called "Scotland's Nordic
Isles." She described a ring of standing stones called the Ring of
Brodgar as follows:
"Originally, it is estimated, about sixty monoliths were erected. Now twenty-seven stand upright with stumps of nine others while four stones are horizontal. Around the Ring is a moat about ten yards wide and six feet deep. Age is difficult to estimate however since the similarity to Avebury in England it is possible that they too are of the early Bronze age. It is doubtful that an accurate estimate will uncover the mystery theories suggest that it was of religious significance with some form of sun worship."
|Home Page of Nancy Bowie: http://www.nancywrites.net Nancy died on Nov. 10, 2009.|
|Copyright Glenn E.
Red Wing, MN 1998. All rights reserved. When last edited: January 15, 2010, 11:20 PM -0500 hours west of Zulu, or Central Standard Time