International Journal of Engineering Science and Technology (IJEST), Vol. 3 No. 8 August 2011 pp 6335f
Ramana Podugu
Research scholar, Mechanical Engineering Department, JNTU, Hyderabad,Andhra Pradesh,India.
J.Suresh Kumar
Associate Professor, Mechanical Engineering Department, JNTU, Hyderabad,Andhra Pradesh,India.
B.V.Ramana murthy
Principal, Visakha Institute of Engineering & Technology
Visakhapatnam,Andhra pradesh.
N.Syam Kumar
Scholar,AU,Visakhapatnam,AP.
Abstract
The mathematical model and FEA model are built for the original centrifugal casing and simulation is made to find the pump natural frequencies. The first ten natural frequencies were compared to pump operating speed and their multiples up to pump vane passing frequency as per HIS (Hydraulic Institute Standards -9.6.4-2000) guidelines. As a result of modification in design, the first natural frequency was increased to 74.31Hz which is above 10% the pump operating speed i.e., 62.5 Hz. Hence, the results of the modified design are satisfied with HIS clause. The results also show that the higher the stiffness of the pump, higher the natural frequency is.
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