ACCELERATION OF AN UNBALANCED ROTOR THROUGH ITS CRITICAL SPEEDS

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Authors
Gluse, Michael R.
Subjects
Advisors
Newton, Robert E.
Date of Issue
1962
Date
1962
Publisher
Monterey, California: U.S. Naval Postgraduate School
Language
en_US
Abstract
The motion of an unbalanced rotor during acceleration through its critical speed is studied by numerical solutions obtained with a digital computer. The rotor is laterally restrained in two orthogonal directions by linear springs and is accelerated by a constant applied torque. It is found that, for a fixed combination of rotor unbalance and lateral stiffnesses, the applied torque must exceed a limiting value in order to accelerate successfully through the critical speed region. With smaller applied torques, after initial acceleration from rest the speed oscillates ontinually about the critical speed and the lateral excursions grow steadily. The conditions necessary for a successful acceleration are established and the maximum lateral ex­cursions during successful accelerations are determined. The effects of small amounts of viscous damping in the lateral directions are also obtained. Finally, an example problem is solved to illustrate the extension of the solution to those problems where applied torque is a function of speed.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
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Distribution Statement
Approved for public release; distribution is unlimited.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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