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Vibration Monitor (Hyde, Wanttaja?)
Necessity, as they say, is a mother.
I am in the process of reinventing a square wheel called a vibration monitor. The electronics is relatively trivial IF the input and output parameters are known. What we know is that the engine is going to have a fundamental frequency at cruise RPM. Let's take the math-simple engine RPM of 2400. This gives us a fundamental frequency of 2400/60 or 40 Hz. But wait, he said. There are going to be other (sub) harmonics of that frequency that will be of some interest. And, those harmonics will change as a function of the engine being a two or four stroke, four or six cylinder. So, oh wise and noble gurus of engine stuffings, what (sub) harmonics are going to be of most interest to us and what is their mathematical relationship to the fundamental? As an extra bonus question, my sensor is going to be an old phonograph cartridge. Should I use the lightest weight "needle" that I can find? How about a tiny little ball of lead at the tip of that needle? Would that help the sensor? Or hinder it? Lastly, once I get this sucker up and running with you all's good ideas, is anybody game to bolt it onto their flying machine and report results? I can do it for the 182, but I'd really like some other real-world reports. Jim |
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