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140 engine hood vibration 140-160

posted by  142 guy on  Fri Jun 30 12:28 CST 2017
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last visit: Wed Oct 22 20:18 CST 2014
[RELATED]

No Dynamat damper pads on the hood. I did run a bead of clear seam sealant down both sides of the center rib. This has eliminated the original first mode vibration with a maxima in the center of the hood. I now have second harmonic oscillations with the maxima midway between the center rib and the outside edge; but, the magnitude of the displacement is much, much smaller. I may try an acoustic blanket under the hood just because its a B20E and sounds like a bag of hammers and nails. But, I expect that the resonant frequency of the hood skin is quite a bit lower than the acoustic noise generated by the engine so I don't expect that an acoustic blanket would make a huge difference.






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