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July 2000

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Subject:
From:
"Stephen R. Gregory" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 18 Jul 2000 19:36:50 EDT
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In a message dated 7/18/00 1:13:02 PM EST, [log in to unmask] writes:

<< Hello all,

 Could anyone tell me about the advantages and disadvantages between
 electrodynamic (ED)and repetitive shock (RS) vibration table? What's the
 guideline for choosing between them?

 Thanks in advance!

 Ruby >>

Hi Ruby!

Go to:

http://www.udco.com/reliab.htm

There's a really good article that describes the differences between
Repetitive Shock and  Electrodynamic Shock machines...this article comes from
Unholtz Dickie Corporation (a maker of vibration testing equipment).

From the article, Repetitive Shock is a very uncontrolled as far as peak G
level and spectrum content is concerned. While Electrodynamic Shock contains
peak G amplitudes that vary within a moderate, programmable range, and
distribution of vibration energy over the test spectrum is uniform.

From going to their home page (http://www.udco.com), there's a bunch of links
that are very informative concerning vibration. The biggest thing that
impressed me with their web site is that they emphasize that one needs to
understand what exactly it is that one is trying to accomplish by doing
vibration...that means one needs to understand the environment that the
product being tested is going to be subjected to, and to what end is the
vibration testing being done.

A VERY good page if you ask me on the subject of HALT/HASS testing. I'm sure
they can help you out with many of your questions.

-Steve Gregory-

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