This paper is concerned with the
finite element analysis and modal testing of an industrial radial flow
impeller. The goal is to determine and verify the vibration and stress
characteristics of the impeller using analytical techniques. The static
structural of the impeller with tapered blades was built using Cero. The
convergence properties of the FE model was then verified by mesh refinement and
mass distribution methods. Next, a pre-test plan was performed before
conducting a modal test in order to select the material on the impeller.
Analysis testing using modal analysis techniques was used to measure the
vibration properties of the impeller, components. The natural frequencies graph
was then compared with the same results obtained from static structural and
showed good agreement. Finally, a parametric study was conducted on disc
thickness, blade thickness, leading edge profiles and blade mistuning. It was
found that the effect of varying disc thickness on the lower modes of the
impeller was not significant. However, significant natural frequency shifts
were observed for the higher modes. It was also concluded that varying the
blade leading edge position had a marked effect on the natural frequencies
while the lower modes were somehow insensitive to the variation of trailing
edge position. - See more at:
No comments:
Post a Comment