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RISModal Testing and Suboptimal Vibration Control of Flexible Rotor Bearing System by Using a Magnetic Bearing
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A suboptimal output feedback controller is designed based on a reduced order model and applied to a flexible rotor bearing system in order to control the unstable or lightly damped vibrations ...
Does Curve Veering Occur in the Eigenvalue Problem of Rotors?
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Recently, Crandall and Yeh (1989) reported an interesting phenomenon in the Campbell diagram of a single spool machine. In their words, “It is interesting that . . . the two modes form a ...
Isotropic Optimal Control of Active Magnetic Bearing System
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: As a new rotor control scheme, isotropic control of weakly anisotropic rotor bearing system in complex state space is proposed, which utilizes the concepts on the eigenstructure of the isotropic ...
H∞ Robust Control of Flexible Beam Vibration by Using a Hybrid Damper
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A new hybrid damper is proposed to suppress the vibration of a flexible cantilever beam at its free end. It consists of an active piezoelectric-type servo-damper and a passive dampled vibration ...
Enhanced Campbell Diagram With the Concept of H∞ in Rotating Machinery: Lee Diagram
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The Campbell diagram, a frequency-speed diagram, has been widely used for prediction of possible occurrence of resonances in the phase of design and operation of rotating machinery since its ...
Vibration Analysis of a Rotor With Multiple Flexible Disks Using Assumed Modes Method
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: An assumed modes method is developed to investigate the effect of multiple flexible disks on the vibrational modes of a flexible rotor system. The analysis rotor model consists of multiple ...
Use of dFRFs for Identification of Travelling Wave Modes in Rotating Disks
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Use of the wave directional frequency response function (dFRF), which is composed of conventional frequency response functions, is proposed for identification of the forward and backward travelling ...
Use of dFRFs for Diagnosis of Asymmetric/Anisotropic Properties in Rotor-Bearing System
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The diagnostic method, which utilizes the dFRFs defined in the stationary and rotating coordinate systems, is tested with a laboratory flexible rotor-bearing system, in order to verify its ...
Weighted Minimum Variance Control of Servo-Damper System With Input Energy Constraint
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The weighted minimum variance control is extended to include the rational transfer function as well as the polynomial as the weighting on system input energy so as to guarantee the closed-loop ...
Complex Time Series Modeling and Analysis for Rotor Dynamics Identification
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A new time series method, directional ARMAX (dARMAX) model-based approach, is proposed for rotor dynamics identification. The dARMAX processes complex-valued signals, utilizing the complex modal ...