There are many types of couplings with "flexible" elements and vibration characteristics vary. A 3-jaw coupling will show high 3x if misaligned, but not if simply "worn" - if aligned well they last a very long time. But they are mostly not well aligned, and wear quickly. I often just see low-frequency broadband vibration that increases over time. I typically "diagnose" them with a strobe light, or when I can't see them, a digital camera (with flash) taking a blind photo from below.
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For others (Omega, Woods single or split element, etc) I usually just see high or increasing 1X as the elements start to deform and create imbalance.For others (Omega, Woods single or split element, etc) I usually just see high or increasing 1X as the elements start to deform and create imbalance.
My experience is that, with the exception of 3-jaw couplings, you can pretty much ignore what you've heard about diagnosing misalignment using vibration, unless the misalignment is severe.My experience is that, with the exception of 3-jaw couplings, you can pretty much ignore what you've heard about diagnosing misalignment using vibration, unless the misalignment is severe.
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Visual inspection of a flexible element is the best, and perhaps the only reliable way to diagnose a "bad" element.Visual inspection of a flexible element is the best, and perhaps the only reliable way to diagnose a "bad" element.
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