The effect of pipe length on modal analysis frequencies
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For pipes of different sizes, when the length of each element takes different values, it has an impact on the modal analysis frequencies. So how can a reasonable element length be determined?
If natural frequencies are calculated using a concentrated load, the pipe length has an impact. Generally, no more than 10D is sufficient. If a uniformly distributed load is used, there will be no such problem. Any length of tube is acceptable.
Generally, external loads have little effect on the natural frequency of pipes, unless the load significantly affects the stiffness of the pipe; in such cases, the length of the element only affects the calculation accuracy.
Reply to 3# power: After my calculations, I found that when the length of the element is reduced, the natural frequencies obtained from the pipeline modal analysis increase. How can this be explained?