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RISInternal Resonance Phenomena of the Jeffcott Rotor With Nonlinear Spring Characteristics
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The Jeffcott rotor is a two-degree-of-freedom linear model with a disk at the midspan of a massless elastic shaft. This model, executing lateral whirling motions, has been widely used in the ...
Vibration Suppression of Rotating Machinery Utilizing an Automatic Ball Balancer and Discontinuous Spring Characteristics
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Automatic ball balancer is a balancing device where two balls inside a hollow rotor move to optimal rest positions automatically to eliminate unbalance. As a result, vibrations are suppressed ...
Vibration Suppression of Rotating Machinery Utilizing Discontinuous Spring Characteristics (Stationary and Nonstationary Vibrations)
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In rotating machinery, resonance phenomena occur with large amplitude in the vicinities of the major critical speeds. In this paper, a new vibration suppression method utilizing a discontinuous ...
Elimination of Unstable Ranges of Rotors Utilizing Discontinuous Spring Characteristics: An Asymmetrical Shaft System, an Asymmetrical Rotor System, and a Rotor System With Liquid
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Unstable vibration occurs in the vicinities of the major critical speeds of asymmetrical shaft and rotor systems. It occurs also in a wide rotational speed range higher than the major critical ...
Detection of a Rotor Crack Using a Harmonic Excitation and Nonlinear Vibration Analysis
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Detection of a rotor crack based on the nonlinear vibration diagnosis using harmonic excitation force is investigated. The open-close mechanism of crack is firstly modeled by a piecewise linear ...
Chaotic Vibration and Internal Resonance Phenomena in Rotor Systems
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Rotating machinery has effects of gyroscopic moments, but most of them are small. Then, many kinds of rotor systems satisfy the relation of 1 to (−1) type internal resonance approximately. In ...
Vibration of the Rigid Rotor Supported by a Repulsive Magnetic Bearing (Influences of Magnetic Anisotropies of Magnets)
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This study focuses on the vibration of the rotor supported by a repulsive-type passive magnetic bearing. It evaluates the restoring force of a repulsive magnetic bearing numerically by considering ...
Forced Vibrations of a Very Slender Continuous Rotor With Geometrical Nonlinearity (Harmonic and Subharmonic Resonances)
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: When both ends of an elastic continuous rotor are supported simply by double-row self-aligning ball bearings, the geometrical nonlinearity appears due to the stiffening effect in the elongation ...
Forced Oscillations of a Continuous Asymmetrical Rotor With Geometric Nonlinearity (Major Critical Speed and Secondary Critical Speed)
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Forced oscillations in the vicinities of both the major and the secondary critical speeds of a continuous asymmetrical rotor with the geometric nonlinearity are discussed. When the self-aligning ...
Vibration Suppression Using Electromagnetic Resonant Shunt Damper
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: An electromagnetic actuator has the property to convert mechanical energy to electrical energy and vice versa. In this study, an electromagnetic resonant shunt damper, consisting of a voice coil ...