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Recent content by vibrationnewbie

  1. vibrationnewbie

    Sine on Random - single profile is possible?

    Thanks so much for the reply, I sincerely appreciate your taking the time and effort! Actually I prefer Figure 514.6D-3 in MIL-STD-810G, p. 327. But hey, it's the same figure. Here's the problem, IMHO, with what the authors did (considering emailing them a question about it, since I'm sure...
  2. vibrationnewbie

    Sine on Random - single profile is possible?

    Yes, thanks, the simple conceptual approach is readily understood. In fact, it's more or less present in my original post. Note that I'm looking for actual numbers with units of measure like g^2/Hz...the kind of stuff you can make a graph with. ;-) If you're not sure how to solve the...
  3. vibrationnewbie

    Sine on Random - single profile is possible?

    Thanks IRstuff! I understand a single frequency doesn't have an equivalent PSD. But rotating or reciprocating parts of assorted vehicles (aircraft, automobiles, etc) DO add sinusoidal spikes, typically a few Hz wide, to the overall random vib PSD. That's why I added the comment "If it helps...
  4. vibrationnewbie

    Sine on Random - single profile is possible?

    Apologies in advance: This exact question has been asked in the last couple years, but I didn't quite follow the answer! Years ago I saw a random vibration profile for an aircraft, the profile had sinusoidal "spikes" representing the rotating propellers. This was for a turboprop, and the...

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