Hello fellow stressers,

If I have calculated the natural frequency of a piping system using Modal analysis in Caesar II, is it possible to get the amplitude of vibration (peak-peak) or it's purely a measured value at field using dynamic instruments. What are the other ways to obtain this amplitude of vibration analytically rather than field measured?.


Cheers!!!!

Natural frequency only specifies at what frequencies input into the system will cause runaway results. I.E. the amplitude effectively becomes whatever the ultimate tensile strength of the material allows it to be, resulting in critical failure.

You need to determine the source and magnitude of your vibrations (be it from a pump, compressor, polar bears walking on your pipe, etc.) and input them to your piping system in order to calculate the response of your piping system to this input.

This value is typically much more reliable if measured.

Thanks Michael for the prompt response.