Results 191 to 200 of about 1,764,784 (231)

Identification of Speed-Dependent Active Magnetic Bearing Parameters and Rotor Balancing in High-Speed Rotor Systems

Journal of Dynamic Systems, Measurement, and Control, 2019
Estimating residual unbalances of a flexible rotor that is fully levitated on active magnetic bearings (AMBs) are challenging tasks due to the modeling error of AMB rotordynamic parameters. In this work, an identification algorithm has been developed for the estimation of dynamic parameters of speed-dependent AMBs and residual unbalances in a high ...
Vikas Prasad, Rajiv Tiwari
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High Speed Rotor Balancing.

1978
Abstract : This report summarizes the accomplishments of a study exploring new methods for balancing, analyzing and designing flexible rotating shafts. It is assumed that the balancing problem is an identification/optimization problem. Emphasis is given to computational optimization formulations.
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Rotor Position and Speed Estimation

2018
Abstract The ultimate importance of rotor position and speed information in permanent magnet synchronous (PMS) machines control, and the industry interest to the rotor and speed sensorless systems as a cost-saving and practical alternative to the motor control with mechanical sensors are emphasized.
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The Calculation of the Rotor Critical Speed of Turbopump

Advanced Materials Research, 2012
With the rotor structure ofturbopump, using a one-dimensional finite element method, considering the mass of shaft, gyroscopic effect and influence of shearing deformation,establishedtheone-dimensional rotor dynamics finite element model, calculated its six rank of the critical speed, and compared the gyroscopic effect and mass of shaft to the ...
Jun Feng Wang, Kang Sun
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Speed-sensorless induction motor control system using a rotor speed compensation with the rotor flux error

2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551), 2004
This paper proposes a speed-sensorless induction motor control system using a rotor speed compensation with the rotor flux error. The rotor flux observer using the reduced-dimensional state estimator technique instead of directly measuring the rotor flux indirectly estimates the rotor flux.
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Non-linear effect in high speed rotor noise

Journal of Sound and Vibration, 1982
Abstract The noise radiated by a high speed rotor is strongly influenced by non-linear air flows near the tip. These non-linearities are made susceptible to analysis by first approximating the full equation by one in which the most significant non-linear term is retained.
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A prediction of high-speed rotor noise

12th Aeroacoustic Conference, 1989
A combined computational (CFD) and integral approach solves the acoustic pressure fields of two high-speed helicopter rotors. A CFD code supplies boundary data to a non-linear type of Kirchhoff integral formulation to find the far-field pressures. Direct calculations of pressures are given by the CFD code up to the sonic cylinder where the Kirchhoff ...
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Passage of a Rotor Through a Critical Speed

Journal of Mechanical Design, 1982
This paper deals with a nonstationary oscillation of a rotor passing through a critical speed. The analysis is based on the method of multiple scales and the method of matched asymptotic expansion. The peak amplitude of the response and the criteria for the onset of the stalling (inability to pass through the critical speed) are derived.
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Gyroscopic effect evaluation and resonance speed prediction of complex high-speed rotor system based on energy

Mechanical Systems and Signal Processing, 2023
Yanhong Ma, Yongfeng Wang, Chenglong Shi
exaly  

Variable rotor speed drivetrain investigation

2018
In dieser Dissertation wird die Entwicklung eines übersetzungsvariablen Getriebes zur Variation der Rotordrehzahl eines Drehflüglers beschrieben. Verschiedene Antriebsstrang- Technologien zur Variation der Rotordrehzahl wurden auf ihre Einsatzmöglichkeit untersucht.
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