Vibe Input, Random or Sine?
Vibe Input, Random or Sine?
(OP)
The following vibration spec came across my desk almost on a cocktail napkin.
Vibration/ Shock Spec:
Frequency Range: 10Hz to 40Hz; amplitude = 0.1" p-p
40Hz to 2000Hz; acceleration = 4g RMS
Frequency Period: 30 minutes; 10Hz to 2000Hz and return
Test Time: 3 hours per axis
My job is to work with a test house to carryout this test. I'm assuming this is not a Random Vibe Test as the Amplitude is not specified in g^2/Hz, am I correct?
Thank you in advance for any advice.
-Tom
Failure is a prerequisite of successful design





RE: Vibe Input, Random or Sine?
TTFN
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RE: Vibe Input, Random or Sine?
sounds like poorly defined swept sine to me.
better go and ask them what they really want!
Cheers
Greg Locock
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RE: Vibe Input, Random or Sine?
Tobalcane
"If you avoid failure, you also avoid success."
"Luck is where preparation meets opportunity"
RE: Vibe Input, Random or Sine?
With the minimal experience/knowledge I have of vibration testing I would agree with GregLocock and figured that it was a Sine Sweep from this part of the spec:
"Frequency Period: 30 minutes; 10Hz to 2000Hz and return", Random vibe excites all frequencies at once, right?
"40Hz to 2000Hz; acceleration = 4g RMS"
Are the amplitudes of Sine Sweeps typically given in g RMS?
Failure is a prerequisite of successful design
RE: Vibe Input, Random or Sine?
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Vibe Input, Random or Sine?
Simples
M.
--
Dr Michael F Platten