Vibration Testing

Mar 22, 2006 10 Replies
D

electronics equipment?

is a concern.

We have always made up our own vibration spec based on the application, both internal board level and mechanical packaging. Unless you are in a regulated industry that demands a certain spec, you'll be pretty safe just making up your own.

Doing a sine sweep over several hundred Hz to failure will reveal a lot. Doing a vibration test to an arbitrary spec and not breaking anything isn't actually proving much.

Then you might want some long term testing too, preferably swept at say half the short term breakage level.

Dave :)

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J

equipment?

is a concern.

Google "Australian environmental vibration standards"
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J

Ian, I can't help you with Australian standards. However, the standard in the USA for airborne equipment is RTCA DO-160E.

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M

electronics equipment?

is a concern.

Or you can just ask Phil Allison. Everyone knows that he's seen a lot of worn out vibrators in his discount toaster repair and used sex toy business.

Service to my country? Been there, Done that, and I\'ve got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida
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J

electronics equipment?

vibration is a concern.

Sno-o-o-o-ort!

Michael, You've been in fine form for several weeks now!

I hope that means that your health has improved!

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | It\'s what you learn, after you know it all, that counts.
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M

electronics equipment?

vibration is a concern.

Not really. I'm still kicking ass, but I stopped taking names. It saves a LOT of time! ;-)

Service to my country? Been there, Done that, and I\'ve got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida
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T

In the military aircraft environment, there are numerous aircraft-specific specs that have to be met, but I'm not aware of a generic spec that applies to domestic equipment.

However, if you wish to examine the durability of your equipment, with a view maybe to ruggedising the design, you could try Highly Accelerated Life Testing, (HALT), which is an extremely useful tool for assessing equipment and produces results much faster than the more traditional endurance testing.

A Google on 'HALT testing' should reveal any facilities in your region.

T If it\'s not broken, don\'t fix it.
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T

There may be some SAE guidelines that would help. Failing that, and if you could find them, military specifications for equipment to go onto trucks would probably be more appropriate, because it would (theoretically) more closely reflect what you'd see on a bus.

Tim Wescott Wescott Design Services http://www.wescottdesign.com Posting from Google? See http://cfaj.freeshell.org/google/
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K

I don't know about Australian busses but the busses here have a smoother ride than a truck does most[1] of the time. This should mean that if you test to the "transportation" levels for long term you will be safe. You may be best off asking the client what tests they want to see (above an beyond your standard stuff that is)

[1] The SanFransisco MUNI bus system is a bit unusual. With the number of wrecks they have, you'd also have to design for shock loads.
-- kensmith@rahul.net forging knowledge
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K

In article , David L. Jones wrote: [....]

I disagree with the above. Doubly so if you disassemble and look for signs of wear. Look at any faces that are bolted together.

-- kensmith@rahul.net forging knowledge
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I

Does anyone know what are the standards for environment testing for electronics equipment?



In particular we want to test a controller box for use in a bus, so vibration is a concern. Australian standards would be most preferred.


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