Design of Hazardous Mechanical Structures, Systems and Components for Extreme Loads
9 Vibration Response of Fluid Distribution Systems
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The analysis of fluid distribution systems normally does not consider vibration as a design-basis requirement. However, once the system is put into service vibrations may be observed due to active equipment (pumps or valves) operation or fluid flow, and analysis may be required to determine whether the observed vibration may cause fatigue types of failure of the system involved . Each type of response may correspond to different failure modes; hence, they should be addressed in a specific way corresponding to the type of vibration being observed or considered.
The most typical case is represented by the beam-type response as a result of the excitation of the structural mode shapes. Piping system structural vibrations typically correspond to the low-frequency range (less than 20Hz), while ductwork or other thin-walled distribution systems may respond with higher-frequency plate or shell modes of vibration.