BISOPE series 88 Natural frequency of solids in fluid flow

BISOPE series 88- Natural frequency of solids in fluid flow ((Method of calculating natural frequency of horizontally crossing tubes or pipes in wind, water, or steam)---------------------------------------------------------------------------------------

There is self-excited vibration caused by friction between solids and fluids.

It refers to vibration that is self-excited, but its true meaning is caused by the fluid force of the fluid (flow induced).

This self-excited vibration is a type of nonlinear vibration that is difficult to predict and has various causes and results.

The fundamental cause is that dynamic loads (mass and velocity) exist in fluids.

 

For example, a placard or electric wire (galloping) shaking in the wind, an airplane wing (flutter), a propeller or oar shaking in water, a tube or valve that vibrates strongly when it reaches a singular velocity in heat exchanger steam are all included.

 

If you look closely, you can see that it is related to a certain unique frequency.

 

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Key! Natural frequency, fluid vibration, Karman vortex, pipe vibration

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