Designed Damping

Damping design Many people confuse damping with amplitude reduction. To clarify and define, damping is a process in which vibration energy is converted into heat. This conversion process is nearly perfectly irreversible. In other words, we rid ourselves of vibration energy that is converted into heat.     The vibration made when a pipe steel structure is impacted by a hammer blow, as sensed by a triaxial accelerometer, can be heard here:   The vibration of the same steel structure with damping added can be heard here:   The difference in damping between the two cases is that the latter has...

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Small Bore – a Low Cost Element that can become very costly

Piping vibration can be troublesome in itself. Small Bore Fittings (a.k.a. Appurtenences) can be worse and usually are the things that first fatigue and break on a piping system and thereby add system risk. There exists vibration fatigue risk criteria for piping vibration failure. These usually are expressed as vibration velocity for the simple reason that it is vibration velocity that is proportional to mechanical stress at resonance, i.e. at the a frequency where we expect vibration/stress to be the highest. Here is a small derivation as to why vibration velocity is proportional to...

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