Evaluation of Critical speed of Generator rotor with external load

Jagannath, K (2012) Evaluation of Critical speed of Generator rotor with external load. International Journal of Engineering Research and Development, 1 (11). pp. 11-16. ISSN 2278-067X

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Abstract

As a result of continuing demand for increased performance, modern generators are designed to operate near critical speed, which causes difficulty in maintaining the rotor balance required to ensure acceptable rotor vibration. Forced vibration due to the external load acting on the shaft line is not considered in evaluation of critical speeds of multi-section shafts. The importance of the current work carried out is to evaluate the critical speed through an automated process. By this process, any configuration of rotor can be used to evaluate the critical speed of multi-section rotor. Thus, for the evaluation of critical speed and to study the rotor behavior in dynamic condition, a script is generated in order to automate the process, thereby reducing the time consumed and increasing the accuracy. The uniqueness of this methodology adopted is that with the help of one script, the inputs like diameter, length of each step of rotor, load acting on the rotor is accessed as variable in to the script. The script is generated in ANSYS parameter design language (APDL). The generated script results are correlated with theoretical results and measured results which are well with in the acceptable limits. Important conclusion of the study is achieving complete automation for evaluating the critical speed by considering external load and for any configuration of combination of rotors.

Item Type: Article
Uncontrolled Keywords: Rotor Generator, Critical speed, ANSYS programming design language, Natural frequency
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 25 Jul 2014 07:16
Last Modified: 25 Jul 2014 07:16
URI: http://eprints.manipal.edu/id/eprint/140238

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