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Stability and dynamics of rotor system with 45° slant crack on shaft

Yanli LIN, Xiaohui SI, Fulei CHU

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 2,   Pages 203-213 doi: 10.1007/s11465-011-0131-4

Abstract:

Crack on a shaft is one of the common damages in a rotor system.Results show that the vibration amplitude of the rotor system with a 45° slant crack on the shaftStability and dynamic characteristics of the rotor system with a 45° slant crack on the shaft underIt is shown that the instability of the transverse vibration of the rotor system increases with increasingThe results are helpful for the understanding the dynamic behavior of a rotor system with a slant crack

Keywords： rotor dynamics     slant crack     stability     torsional excitation     open and close    

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New analysis model for rotor-bearing systems based on plate theory

Zhinan ZHANG, Mingdong ZHOU, Weimin DING, Huifang MA

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 4,   Pages 461-473 doi: 10.1007/s11465-019-0525-2

Abstract: The new analysis model is suitable for static and modal analyses of rotor-bearing systems.

Keywords： rotor-bearing system     rolling element bearing     plate theory     finite element analysis    

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Balancing method without trial weights for rotor systems based on similitude scale model

Ruiduo YE, Liping WANG, Xiaojie HOU, Zhong LUO, Qingkai HAN

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 4,   Pages 571-580 doi: 10.1007/s11465-018-0478-x

Abstract: dynamic similitude scale model was proposed as a solution to the balancing problem of a large-scale rotorsystem.First, with the rotor system as the research object, the analytical expression of the influence coefficientwas derived on the basis of rotor dynamics theory.system.

Keywords： rotor system     dynamic similitude     balancing     without trial weights     influence coefficient    

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Analysis of stability and nonlinear response of rotor system with elliptical sliding bearing supports

LU Yanjun, LIU Heng, YU Lie, LI Qi, JIANG Ming, ZHANG Zhiyu

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1,   Pages 37-45 doi: 10.1007/s11465-007-0006-x

Abstract: calculate equilibrium position and critical speed corresponding to Hopf bifurcation point of bearing-rotorsystem, as by-product dynamic coefficients of bearing are obtained.The timescale, i.e., the unknown whirling period of Hopf bifurcation solution of bearing-rotor systemThe nonlinear unbalanced periodic responses of the system are obtained by using PNF method and path-followingThe numerical results revealed the rich and complex nonlinear behavior of the system, such as periodic

Keywords： computational     corrector mechanism     predictor corrector     multisolution     quasiperiodic    

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Experimental and theoretical investigations of the lateral vibrations of an unbalanced Jeffcott rotor

Ali ALSALEH, Hamid M. SEDIGHI, Hassen M. OUAKAD

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 4,   Pages 1024-1032 doi: 10.1007/s11709-020-0647-y

Abstract: experimentally explores and then theoretically examines the lateral vibrations of an unbalanced Jeffcott rotor-systemTo this end, three conditions of eccentric masses are considered by using a Bently Nevada RK-4 rotorthe basis of rigid rotor assumptions to theoretically predict the lateral vibrations.The dynamic features of the rotor system such as the linearized bearing induced stiffness are exclusivelyillustrates the applicability of employing simple models to predict the dynamic response of a real rotor-system

Keywords： rotor-dynamics     Jeffcott rotor     lateral vibrations     Lagrange method     system-equivalent stiffness     sleeve bearings    

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Vibratory behaviors of Jeffcott system on cylindrical roller bearings

Hao WU, Jianwen WANG, Qi AN

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 3,   Pages 305-309 doi: 10.1007/s11465-009-0036-7

Abstract: A Jeffcott rotor system of cylindrical roller bearings is studied in detail.The influences of bearing parameters, such as the roller length, rotor mass, distance between the bearingsand the kinematics viscosity of oil on the system critical speed are numerically studied, and the influencesRegular curves of the relationship between the geometric parameters and the system critical speed areThis means that an oil film will decrease the critical rotational speed of the rotor system.

Keywords： roller bearing     bearing-rotor system     design value     critical rotational speed    

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A novel NN based rotor flux MRAS to overcome low speed problems for rotor resistance estimation in vector

Venkadesan ARUNACHALAM,Himavathi SRINIVASAN,A. MUTHURAMALINGAM

Frontiers in Energy 2016, Volume 10, Issue 4,   Pages 382-392 doi: 10.1007/s11708-016-0421-y

Abstract: This paper presents a new neural network based model reference adaptive system (MRAS) to solve low speedproblems for estimating rotor resistance in vector control of induction motor (IM).The MRAS using rotor flux as the state variable with a two layer online trained neural network rotorflux estimator as the adaptive model (FLUX-MRAS) for rotor resistance estimation is popularly used inThese lead to a significant error in the estimation of rotor resistance at low speed.
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Study on wave rotor refrigerators

Yuqiang DAI, Dapeng HU, Meixia DING

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 1,   Pages 83-87 doi: 10.1007/s11705-009-0075-y

Abstract: As a novel generation of a rotational gas wave machine, the wave rotor refrigerator (WRR) is an unsteady

Keywords： wave rotor     refrigeration     unsteady flow theory     wave diagram    

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Optimization model for rotor blades of horizontal axis wind turbines

LIU Xiong, CHEN Yan, YE Zhiquan

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 4,   Pages 483-488 doi: 10.1007/s11465-007-0084-9

Abstract: This paper presents an optimization model for rotor blades of horizontal axis wind turbines.

Keywords： population     extended     algorithm     developed optimization     accurate    

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The computational fluid dynamic modeling of downwash flow field for a six-rotor UAV

Yongjun ZHENG, Shenghui YANG, Xingxing LIU, Jie WANG, Tomas NORTON, Jian CHEN, Yu TAN

Frontiers of Agricultural Science and Engineering 2018, Volume 5, Issue 2,   Pages 159-167 doi: 10.15302/J-FASE-2018216

Abstract: The downwash flow field of the multi-rotor unmanned aerial vehicle (UAV), formed by propellers duringcharacteristics of the distribution of the downwash airflow and simulate the static wind field of multi-rotorUAVs in hovering state, a 3D full-size physical model of JF01-10 six-rotor plant protection UAV wasThese results can be applied to six-rotor plant protection UAVs employed in pesticide spraying and spray

Keywords： CFD simulation     downwash flow field     numerical analysis     plant protection     six-rotor UAV    

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Structure improvement and strength finite element analysis of VHP welded rotor of 700°C USC steam turbine

Jinyuan SHI,Zhicheng DENG,Yong WANG,Yu YANG

Frontiers in Energy 2016, Volume 10, Issue 1,   Pages 88-104 doi: 10.1007/s11708-015-0387-1

Abstract: shutdown, to obtain the temperature and stress distribution as well as the stress ratio of the welded rotorThe strength design criteria and strength analysis results of the welded rotor are given.The results show that the strength design of improved structure of the VHP welded rotor of the 700°C

Keywords： 700°C ultra-super-critical unit     steam turbine     very high pressure rotor     structure strength design     strength    

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Induction motors variable speed drives diagnosis through rotor resistance monitoring

K. YAHIA, S. ZOUZOU, F. BENCHABANE

Frontiers in Energy 2012, Volume 6, Issue 4,   Pages 420-426 doi: 10.1007/s11708-012-0192-z

Abstract: Rotor asymmetries lead to perturbations of air gap flux patterns in induction machines.It then studies the broken rotor bars (BRBs) fault by the monitoring the rotor resistance.increase when a rotor bar breaks.The rotor resistance is estimated and compared with its nominal value to detect BRBs fault.The EKF estimates the rotor flux, speed and rotor resistance on line by using only measurements of the

Keywords： induction motor     vector control     broken rotor bars (BRBs) diagnostic     extended Kalman filter (EKF)    

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Impact analysis of compressor rotor blades of an aircraft engine

Y B SUDHIR SASTRY, B G KIROS, F HAILU, P R BUDARAPU

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 3,   Pages 505-514 doi: 10.1007/s11709-018-0493-3

Abstract: based alloys: 6061-T6, 7075-T6, and 2024-T4, has been performed, apart from the impact analysis of the rotor

Keywords： axial flow compressor     rotor and stator blades     aircraft engine     stress and impact analysis     aluminum alloys    

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Influence of the Mechanical Seals on the Dynamic Performance of Rotor–Bearing Systems

XU Hua, ZHU Jun

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 1,   Pages 96-100 doi: 10.1007/s11465-005-0008-5

Abstract: bearing system.To check the response of the rotor bearing system under unbalance motivation, the Gauss method is usedbearing system of the high-speed machinery.The analysis results show that the mechanical seal more or less has effects on the rotor bearing systemThe mechanical seal has much more effects on the flexible rotor bearing system than on the rigid one.
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Effect of heat transfer coefficient of steam turbine rotor on thermal stress field under off-design condition

Jie GUO,Danmei XIE,Hengliang ZHANG,Wei JIANG,Yan ZHOU

Frontiers in Energy 2016, Volume 10, Issue 1,   Pages 57-64 doi: 10.1007/s11708-015-0385-3

Abstract: The precise calculation of temperature and thermal stress field of steam turbine rotor under off-designFirst, a finite element analysis of rotor model, applied with ordinary rotor materials, has been conductedaccuracy of coefficient calculation when steam parameters are low has a greater influence on that of rotor

Keywords： steam turbine     rotor     thermal stress     heat transfer coefficient     empirical formula    

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Title Author Date Type Operation

Stability and dynamics of rotor system with 45° slant crack on shaft

Yanli LIN, Xiaohui SI, Fulei CHU

Journal Article

New analysis model for rotor-bearing systems based on plate theory

Zhinan ZHANG, Mingdong ZHOU, Weimin DING, Huifang MA

Journal Article

Balancing method without trial weights for rotor systems based on similitude scale model

Ruiduo YE, Liping WANG, Xiaojie HOU, Zhong LUO, Qingkai HAN

Journal Article

Analysis of stability and nonlinear response of rotor system with elliptical sliding bearing supports

LU Yanjun, LIU Heng, YU Lie, LI Qi, JIANG Ming, ZHANG Zhiyu

Journal Article

Experimental and theoretical investigations of the lateral vibrations of an unbalanced Jeffcott rotor

Ali ALSALEH, Hamid M. SEDIGHI, Hassen M. OUAKAD

Journal Article

Vibratory behaviors of Jeffcott system on cylindrical roller bearings

Hao WU, Jianwen WANG, Qi AN

Journal Article

A novel NN based rotor flux MRAS to overcome low speed problems for rotor resistance estimation in vector

Venkadesan ARUNACHALAM,Himavathi SRINIVASAN,A. MUTHURAMALINGAM

Journal Article

Study on wave rotor refrigerators

Yuqiang DAI, Dapeng HU, Meixia DING

Journal Article

Optimization model for rotor blades of horizontal axis wind turbines

LIU Xiong, CHEN Yan, YE Zhiquan

Journal Article

The computational fluid dynamic modeling of downwash flow field for a six-rotor UAV

Yongjun ZHENG, Shenghui YANG, Xingxing LIU, Jie WANG, Tomas NORTON, Jian CHEN, Yu TAN

Journal Article

Structure improvement and strength finite element analysis of VHP welded rotor of 700°C USC steam turbine

Jinyuan SHI,Zhicheng DENG,Yong WANG,Yu YANG

Journal Article

Induction motors variable speed drives diagnosis through rotor resistance monitoring

K. YAHIA, S. ZOUZOU, F. BENCHABANE

Journal Article

Impact analysis of compressor rotor blades of an aircraft engine

Y B SUDHIR SASTRY, B G KIROS, F HAILU, P R BUDARAPU

Journal Article

Influence of the Mechanical Seals on the Dynamic Performance of Rotor–Bearing Systems

XU Hua, ZHU Jun

Journal Article

Effect of heat transfer coefficient of steam turbine rotor on thermal stress field under off-design condition

Jie GUO,Danmei XIE,Hengliang ZHANG,Wei JIANG,Yan ZHOU

Journal Article