Skip to Main Content

Flow Induced Vibration of Power and Process Plant Components: A Practical Workbook

M. K. Au-Yang, Ph.D., P.E.
M. K. Au-Yang, Ph.D., P.E.
Search for other works by this author on:
No. of Pages:
ASME Press
Publication date:
In the special case when only one of the cylinders is flexible, the “in-water” natural frequencies of the shell can be obtained from the “in-air” frequencies by simple rationing:  
As shown in Chapter 4, one of the major tasks of calculating the hydrodynamic mass is the calculation of the hydrodynamic mass component h. In this chapter, simplified expressions for calculating h in special cases are given. Of these, the most commonly used in the industry is the “slender cylinder” approximation:  

However, for application to large-shell structures commonly encountered in the power and process industries, Equation (5.2) often overestimates the hydrodynamic masses by as much as a factor of two or more. In addition, these equations give the hydrodynamic mass components in the form of surface densities. The effective hydrodynamic mass still has to be computed based on Equation (4.50). Failure to observe this has lead to inconsistencies in the hydrodynamic mass formulation of coupled fluid-shell problems.

This content is only available via PDF.
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal