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Back in the day (early 1912), I was in touch with Mark Jennings (the industrial engineer specializing in vibration studies). In fact I introduced him to the BRBS folks because he was looking for a wider sample of cars so he could start building a data base that he might develop into a predictive method of detection. In between that time and BRBS, I think his local to him experiments led him to the conclusion that what worked in an industrial fixed site environment wasn't going to work for a car mounted engine and he abandoned the quest and that may well have been because of economic reasons. A manufacturing plant might spend $10k to do a replacement based on a 75% probability of the detection method just because the failure could have multi-million dollar impact on their production and they would do it during normal plant shutdown. But how many shop owners would install a costly tool that was only that accurate and who would advocate replacement on the maybe it is bad basis.
There was an article in one of his local INWR PCA newsletters.
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