I can't believe this is still going on. We've shot down angle mounted fixtures as multi-axis fixtures at least twice that I remember. All you are doing is exciting a different axis. Unless you know this the fragile axis, so what? I think you're misinterpreting Wayne. Why would a diffferent...
Look out for Mile's equation. Terry Scharton of JPL has written several papers on the subject in conjunction with force-limited testing. Mile's gives the correct ratio of response acceleration-to-base acceleration, but overlooks the fact that a valley in the base acceleration spectra will...
I don't think you need an alternative. The so-called Willoughby profile is considered a starting point and as Tom Irvine has already pointed out the final screnn is what works best for the product. That is a screen that weeds out defective units without damaging good ones.
According to Dave Smallwood removing spurious DC componenets via wavelet decomposition instead of high pass filtering is preferable. A wavelet analysis packet is available from Matlab. Dave is at Sandia in New Mexico and has published papers on the subject. My wavelet packet is on order, so I...
A word of caution - This is a good STARTING point, but screens are developmental. That is - if you get too many failures, or not enough, you need to lower, raise, or notch the spectrum. A bit of folklore - when this spec first came out in the 80's the profile was called...
The Institute of Environmental Sciences and Technology (IEST) is a great source of vibration info. Their annual Technical meeting is in Providence RI, 4/30 - 5/4 2000. They are having tutorials that cover exactly what you are interested in.<br>
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940 East Northwest Highway<br>
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The whole area of "modal analysis", analytical and experimental, involves standing waves. Musical instruments are a good example, especially strings, which are easy to picture. I.E. the string is always distorted in the same shape only varying plus and minus and how much. An ocean...
