Results 11 to 20 of about 14,198 (266)

STUDY ON DYNAMIC BALANCE OF AEROENGINE FLEXIBLE ROTOR BASED ON TRANSFER FUNCTION

Jixie qiangdu, 2021
The influence coefficient method and transfer function method are applied to the dynamic balance of aero-engine flexible rotor. The static transfer function of the flexible rotor is obtained by hammering on the experimental bench of the aero-engine ...
ZHANG Ying, WANG KunPeng, MA Liang
doaj  

Oil Whirl of Flexible Rotors [PDF]

Proceedings of the Institution of Mechanical Engineers, 1962
The equations for a flexible rotor in journal bearings are set up and solved, extending the method previously used by Hummel and Cameron. It is shown that if w is the natural elastic frequency of the rotor, A the resonant oil frequency for an infinitely stiff but otherwise identical rotor, then the combined frequency s is given by l/ s2 = 1/Λ2 + 1/ w2.
Z. Parszewski, A. Cameron
openaire   +2 more sources

Active vibration control of the flexible high-speed rotor with magnetic bearings via phase compensation to pass critical speed

Journal of Low Frequency Noise, Vibration and Active Control, 2019
In modern industries, high-speed motors and generators have received great attention, and they are widely used in micro turbine, centrifugal compressor, blower, etc.
Shaolin Ran, Yefa Hu, Huachun Wu, Xin Cheng   +3 more
doaj   +1 more source

On a programme for the balancing calculation of flexible rotors with the influence coefficient method

Vietnam Journal of Mechanics, 2000
This paper presents the influence coefficient method of determining the locations of unbalances on a flexible rotor system and the correction weights. A computer software for calculating the at-the-site balancing of a flexible rotor system was created ...
Nguyen Van Khang, Tran Van Luong
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Balancing of Flexible Rotors

Transactions of the Japan Society of Mechanical Engineers, 1972
A study of balancing of flexible rotors with uniform cross sections supported by two bearings at both ends is performed by calculation, putting m as the number of critical speeds which are in the operating speed range. Using m+2 balancing planes, we can eliminate the static and dynamic unbalances at low speeds and the vibration components of the normal
OMORl, Toshiji, IIDA, Seiichi, IWATSUBO, Takuzo   +2 more
openaire   +3 more sources

Experimental and Numerical Investigations of a Flexible Rotor on Flexible Bearing Supports

International Journal of Rotating Machinery, 2005
The main goal of this paper is to study, numerically and experimentally, the effects of the bearing support flexibility on the rotor dynamic and the first forward and backward critical speeds.
J.-J. Sinou, C. Villa, F. Thouverez
doaj   +1 more source

Smart machines with flexible rotors

Mechanical Systems and Signal Processing, 2009
Abstract The concept of smart machinery is of current interest. Several technologies are relevant in this quest including magnetic bearings, shape memory alloys (SMA) and piezo-electric activation. Recently, a smart bearing pedestal was proposed based on SMAs and elastomeric O-rings.
openaire   +3 more sources

Balancing of Flexible Rotors by using Flexible Bearing Pedestals

Transactions of the Japan Society of Mechanical Engineers, 1970
In this paper, the balancing of flexible rotors by using flexible bearing pedestals is discussed. The rotor systems having flexible bearing pedestals are analyzed and the relations between the natural frequency of a pedestal system and that of the whole system are shown in a nondimensional form.
KAWAI, Ryoji, IWATSUBO, Takuzo
openaire   +2 more sources

Design, modeling, and robust control of the flexible rotor to pass the first bending critical speed with active magnetic bearing

Advances in Mechanical Engineering, 2018
Recently, magnetic bearings have been applied to many rotating machines such as turbo-molecular pumps, cooling gas compressor, flywheel energy storage systems.
Shaolin Ran, Yefa Hu, Huachun Wu
doaj   +1 more source

Influence of Bearing Wear on the Stability and Modal Characteristics of a Flexible Rotor Supported on Powder-Lubricated Journal Bearings

Lubricants, 2023
This study has investigated the influence of journal bearing wear on the dynamic behaviour of a flexible rotor with a central disc. Rotors supported on journal bearings are susceptible to self-excited whirling, leading to unstable conditions.
Faisal Rahmani, Emad Makki, Jayant Giri
doaj   +1 more source