Circuit board vibration analysis 1

[ddddarkbull]

Any experienced vibration analyst can provide me with the analysis procedure to determine if a complex circuit board assembly (i.e. has different mix of component types) will survive a given level of vibration level for aircraft application?
Please assume the circuit board spec (e.g. component, board layer, chassis mounting) as well as the input vibration level (including frequency range) are given.
I expect many people will refer to Steinberg's publication, I would like to hear someone using different methodology.
I heard the rumor that NASA has specification for acceptable natural frequency for circuit board, is that true?

 

[IRstuff]

> solicitation for services is not allowed in the forums; there is a job posting area for that

> Whatever NASA might or might not have is irrelevant to you, unless you're planning on using it on a Shuttle or rocket that no longer exists.

> You seem to asking basically the same question that you asked in your other thread. The answer remains the same. Your board must meet your requirements, and no one else's. Asking whether your board will "survive a given level of vibration level for aircraft application" is not a relevant question. The question is HOW LONG can it survive, and for which aircraft. IF you have consulted MIL-STD-810, you'll see that there are a variety of environments for a variety of aircraft. Each aircraft and aircraft class has different behaviors. So, while you think you have gotten sufficient information to begin the task, you haven't. You need to determine which aircraft this board is going on, and you need to determine how long you want this board to survive. Only then can you even begin to determine whether the board needs to be further ruggedized.

TTFN
faq731-376

 

[ddddarkbull]

IRSTUFF,

I am not sure where you got the solicitation from my posting. It is a TECHNICAL DISCUSSION to find someone to share their experience in this forum. For sure there is no money involved.

NASA have large collection of technical data, many of them are generic and can be reference if deem appropriate. I myself has successfully applied some material spec from NASA previously for aircraft project. There is no limitation the spec can only be used in Shuttle and rocket application.

Oops, I missed the Duration from my original posting...as I thought it is common sense for given vibration requirement to include duration as part of qual program. I think your response is going off tangent. The issue I am interested in is the procedure/process and your more positive input is welcome.

 

[IRstuff]

No, duration I'm referring to is USEFUL LIFE. Having a board just barely surviving qual is not necessarily a sufficient condition, since survival tests are often specified for a fraction of useful life.

TTFN
faq731-376