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Mechanical resonance is the tendency of a mechanical system to absorb more energy when the frequency of its oscillations matches the system's natural frequency of vibration (its resonance frequency or resonant frequency) than it does at other frequencies. It may cause violent swaying motions and even catastrophic failure in improperly constructed structures including bridges, buildings and airplanes—a phenomenon known as resonance disaster.
banks engineering
All flames make noise and larger ones make more. You can’t hear the noise from a pocket lighter, but you know when your gas water heater or gas fired central heat burner starts. And any industrial size furnace makes enough noise that you can tell if it is on without looking. Usually combustion noise can be ignored – it seldom causes problems. In rare cases it’s loud enough to draw complaints from the neighbors and even vibrate equipment to destruction. Here we will consider cases like that. A Little Theory: Any noise has a frequency and an amplitude. You can hear noise over a frequency range of about 20 to 20,000 Hz or cycles per second. Noise at a frequency less than 20 Hz might be felt but not heard – you might notice the floor or windows rattling even though you can’t hear the sound.
Conclusion The negative effects of combustion pulsation include; Rhythmic flame body displacement (flame detection device may lose sight of the flame), Brief loss of combustion air flow as furnace pressure peaks, briefly reducing air flow (low flow switch may trip), "Breathing" of the furnace shell and expansion joints leading to material failure through fatigue. Structural damage to the furnace if the amplitude is high enough. Extremely irritated operators and neighbors.
Originally posted by bwcawaterbear
Good job, recently a two different groups of scientists went around the world to all the locations of the sky noises and else where and with their instrumentation found out that the earth was releasing tremendous amount of energy, way more than usual. In fact it was off the charts. The core of the Earth is in great flux. When this energy is released into the atmosphere it causes harmonic resonance and you hear sounds. The problem of course is that we are in post glacial rebound and it will last another 10,000 years. We may see some crustal displacement because of it. But good job on the post.
Originally posted by DIRTYDONKEY
reply to post by cavalryscout
is a little unnerving to think the earth may be suffering this effect,
Originally posted by bwcawaterbear
Good job, recently a two different groups of scientists went around the world to all the locations of the sky noises and else where and with their instrumentation found out that the earth was releasing tremendous amount of energy, way more than usual. In fact it was off the charts. The core of the Earth is in great flux. When this energy is released into the atmosphere it causes harmonic resonance and you hear sounds. The problem of course is that we are in post glacial rebound and it will last another 10,000 years. We may see some crustal displacement because of it. But good job on the post.
Originally posted by ChristianJihad
reply to post by DIRTYDONKEY
Well I'm not one for flights of fancy but I listned to that noise and now I really feel unwell, I got to the third video and had to stop because my head feels hung over and I want to vomit.