Dissertation > Industrial Technology > General industrial technology > Acoustic engineering > Vibration, noise and its control > Vibration and noise control and its use

Structure Vibration Analysis and Experimental Research of Compact Centrifugal Fan

Author HuBiao
Tutor ShuChaoZuo
School Huazhong University of Science and Technology
Course Refrigeration and Cryogenic Engineering
Keywords Small Centrifugal fan Impeller Structural Optimization Volute structure Analysis Vibration Response Of The Elastic Support
Type Master's thesis
Year 2011
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Vibration is an important indication of system performance in centrifugal fan. Vibration of the centrifugal fan and its dynamic behavior has become a key technology of some corporations, which concerns the safe and normal operating of the machine. The impelle and volute are principal parts of the fan, their performance have an outsized effect on the efficiency of the fan; As the main source of vibration and noise in fan operation, the research on their Vibration Characters are very necessary.Centrifugal fan impeller is the core component of fan for energy conversion; it directly affects the coefficient of safety of the fan. This paper use the ANSYS software to do the finite element analysis for strength Calculating and the modal of the Centrifugal fan impeller, optimum design of the impeller are proposed in combination with the experimental data and several practical circuits. The optimized impeller holds the advantage over right now no matter for its process features or mechanical properties.The volute is one of the main areas which produce vibratory motions. The paper simulated the natural frequency of the volute, and discussed the influence of its natural frequency when changing the thickness at different parts of the volute. At last, a optimum design is proposed, its natural frequency are far away from the basic frequency and double frequency of the fan.The centrifugal force caused by the unbalance value of the impeller is one of the important reasons which cause the fan vibration. This paper did the finite element analysis for the modal of the fan test-bed to obtain its natural frequency. Basing on the modal analysis, harmonic response analysis of the test-bed was done to obtain the graph between the values of response (displacement) and frequencies. The dynamic response variations of the test-bed were explored when changing the rigidity of the absorbers and the distances between each absorber. At last, the most suitable rigidity of the absorber was obtained while using current test-bed, the most suitable distances between each absorber was also obtained while using current absorber, which have some guideline to the optimizing design of the test-bed.

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