Design and dynamic modelling of a coaxial-rotor system

2016 ◽  
Author(s):  
Na Zhao ◽  
Hongbin Deng ◽  
Chao Wang ◽  
Kewei Li ◽  
Shikui Jia
Keyword(s):  
Dynamic Modelling ◽  
Rotor System ◽  
Coaxial Rotor

scholarly journals Dynamic Modelling and Response Characteristics of a Magnetic Bearing Rotor System With Auxiliary Bearings

1995 ◽  
Author(s):  
April M. Free ◽  
George T. Flowers ◽  
Victor S. Trent
Keyword(s):  
Dynamic Modelling ◽  
Magnetic Bearing ◽  
Rotor System ◽  
Rolling Element Bearing ◽  
Test Facility ◽  
Iron Core ◽  
Critical Feature ◽  
Response Characteristics ◽  
Rolling Element ◽  
Auxiliary Bearing

Abstract Auxiliary bearings are a critical feature of any magnetic bearing system. They protect the soft iron core of the magnetic bearing during an overload or failure. An auxiliary bearing typically consists of a rolling element bearing or bushing with a clearance gap between the rotor and the inner race of the support. The dynamics of such systems can be quite complex. It is desired to develop a rotordynamic model which describes the dynamic behavior of a flexible rotor system with magnetic bearings including auxiliary bearings. The model is based upon an experimental test facility. Some simulation studies are presented to illustrate the behavior of the model. In particular, the effects of introducing sideloading from the magnetic bearing when one coil fails is studied. These results are presented and discussed.

Blade Passage Loads and Deformation of a Coaxial Rotor System in Hover

2019 ◽  
Vol 56 (6) ◽  
pp. 2144-2157 ◽  
Author(s):  
Daiju Uehara ◽  
Jayant Sirohi ◽  
Roland Feil ◽  
Jürgen Rauleder
Keyword(s):  
Rotor System ◽  
Blade Passage ◽  
Coaxial Rotor

scholarly journals Spectrum Analysis of a Coaxial Dual-Rotor System with Coupling Misalignment

2020 ◽  
Vol 2020 ◽  
pp. 1-19
Author(s):  
Hongxian Zhang ◽  
Liangpei Huang ◽  
Xuejun Li ◽  
Lingli Jiang ◽  
Dalian Yang ◽  
...  
Keyword(s):  
Spectral Characteristics ◽  
Element Model ◽  
Rotor System ◽  
Harmonic Frequencies ◽  
Coaxial Rotor ◽  
Outer Rotor ◽  
Frequency Components ◽  
Harmonic Resonance ◽  
The Finite Element Model ◽  
Engine Rotor

The finite element model of a dual-rotor system was established by Timoshenko beam element. The dual-rotor system is a coaxial rotor whose supporting structure is similar to that of an aero-engine rotor system. The inner rotor is supported by three bearings, which makes it a redundantly supported rotor. The outer rotor connects the inner rotor by an intershaft bearing. The spectrum characteristics of the dual-rotor system under unbalanced excitation and misalignment excitation were analysed in order to study the influence of coupling misalignment of the inner rotor on the spectral characteristics of the rotor system. The results indicate that the vibration caused by the misaligned coupling of the inner rotor will be transmitted to the outer rotor through the intershaft bearing. Multiple harmonic frequency components, mainly 1x and 2x, will be excited by the coupling misalignment. The amplitudes of all harmonic frequencies increase with the misalignment in both the inner and outer rotors. The vibration level of the outer rotor affected by the misalignment is lower than that of the inner rotor because it is far from the misaligned coupling. Harmonic resonance occurs when any harmonic frequencies of the misalignment response coincide with a natural frequency of the system. In order to verify the theoretical model, experiments are performed on a test rig. Both the experimental and simulation results are in good accordance with each other.

Sensitivity Analysis and Uncertainty Quantification of a Coaxial Rotor System

2019 ◽  
Author(s):  
Phuriwat Anusonti-Inthra ◽  
Ethan Corle ◽  
Brendan Smith ◽  
Zackery Nieto
Keyword(s):  
Sensitivity Analysis ◽  
Uncertainty Quantification ◽  
Rotor System ◽  
Coaxial Rotor

Aeromechanics Analysis of a High-Advance-Ratio Lift-Offset Coaxial Rotor System

2019 ◽  
Vol 56 (1) ◽  
pp. 166-178 ◽  
Author(s):  
Roland Feil ◽  
Jürgen Rauleder ◽  
Christopher G. Cameron ◽  
Jayant Sirohi
Keyword(s):  
Rotor System ◽  
Coaxial Rotor ◽  
Advance Ratio
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