Fatigue (FEA) and Modal Analysis of a Centrifugal Fan

Manish Dadhich1, Sheetal Kumar Jain2 , Vikas Sharma1 , Sanjay Kumar Sharma1 , Dhirendra Agarwal3 

1Grob Design Pvt. Ltd., Jaipur, Rajasthan, India 

2Apex Institute Of Engineering and Technology, Jaipur, Rajasthan, India 

3 FET Agra College, Agra ,Uttar Pradesh,India

Abstract:

Centrifugal fans are high speed rotating turbo machines vulnerable to vibrations resulting in the failure of the system eventually. During every start-up and shutdown of centrifugal fan, the fan blades are subjected to centrifugal, bending and vibratory loads. This repeated start-up and shutdown can reduce the life of fan blades. A fatigue and modal analysis of the fan is, therefore, very important in the design and development of fans, to prevent premature failure. In this paper the finite element analysis of a centrifugal fan impeller, for a high tuned design is carried out using ANSYS. The Finite Element Analysis is to be done on the following platform, “Fatigue and modal analysis at 705 rpm at 110°F” to determine the various performance parameters. Analysis is linear static structural and the model used is Gerber stress theory. From fatigue analysis we can determine whether the fan is safe to run in the operating conditions and further the design can be improved. Modal analysis of the fan is very important in the design and development of fan, to prevent premature failure. In modal analysis the first ten natural frequencies were compared to the frequency generated from fan operating speed. This is done to avoid resonance phenomenon which causes the vibration failure. So that fan can run safely in the operating conditions.

Keywords:

ANSYS, Centrifugal fan, Fatigue analysis, Finite element analysis, Gerber stress theory, Modal analysis and Resonance.

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