GEM Series G3 - Vibration Analysis
New Capabilities for the Next Generation G3 GEM
If you take a step back from the EGT/CHT idea to explore engine monitoring in general, you discover that at least half the engine monitoring solution is missing. EGT analysis reveals combustion phenomenon but simply ignores mechanical problems.
By the time a mechanical problem shows up in EGT, if it ever does, the damage is done and it is far too late to do anything about it.
Vibration analysis is the key to preemptive detection of mechanical problems.
Helicopter mechanics have for years used vibration analysis like a secret weapon to solve their toughest problems.
We can detect vibration by feel but seat-of-the-pants vibration analysis is it is neither sensitive nor discriminating. Fortunately Math & Science comes to our rescue. Combine sensitive vibration sensors with discriminating mathematics in the new GEM and you have a system thousands of times better at vibration sensing than our poorly evolved human skills.
The math that does the magic is called the Fast Fourier Transform. It organizes the vibration data as a spectrum in the frequency domain. Spectral analysis splits a vibration signature into frequency components like a prism splits the colors in white light.
A powerful feature of spectral analysis is to discriminate and categorize the sources of vibration.
Continuing the prism analogy, a crankshaft problem shows up as one color, a camshaft problem in a different color, and an alternator problem in yet another color. Once transformed a strong vibration component can’t overwhelm or even affect a nearby one of much smaller size.
Amazing subtleties are easily revealed.
By Rick Lindstrom
G3 Graphic Engine Monitor - TC EGT, CHT and TIT PRIMARY STC
Single Engine - Normally Aspirated or Turbo-Charged with SD Data Card for 4, 6 or 9 Cylinder.
G3 size and depth for panel planning see drawing  - Click Here
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STC'd FOR PRIMARY CHT, EGT AND TIT