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Dynamics analysis of a cracked dual-disk over-hung rotor-bearing system
CHEN Hong, LI He, WEN Bang-chun, ZHANG Xiao-wei
《机械工程前沿(英文)》 2006年 第1卷 第2期 页码 204-208 doi: 10.1007/s11465-006-0002-6
关键词: nonlinear oil-film diagnosis bifurcation dynamic numerical Runge-Kutta
HHT-based crack identification method for start-up rotor
Bing LI, Chunlin ZHANG, Zhengjia HE
《机械工程前沿(英文)》 2012年 第7卷 第3期 页码 300-304 doi: 10.1007/s11465-012-0328-1
This paper presents a crack identification method for start-up rotor based on the Hilbert-Huang transform (HHT). With this method, the instantaneous frequency (IF) of each intrinsic mode function is obtained through the Hilbert transform, and the spectrum of IF is calculated accordingly. The influence of acceleration and crack depth on the rotor is analyzed through experiments. HHT is employed to detect the shallower crack, and is then tested during the start-up process of the rotor. The results of the experiment show that HHT is a better tool for crack detection than fast Fourier transform.
null
《机械工程前沿(英文)》 2014年 第9卷 第2期 页码 191-202 doi: 10.1007/s11465-014-0293-y
In present study, free vibration of cracked beams resting on two-parameter elastic foundation with elastically restrained ends is considered. Euler-Bernoulli beam hypothesis has been applied and translational and rotational elastic springs in each end considered as support. The crack is modeled as a mass-less rotational spring which divides beam into two segments. After governing the equations of motion, the differential transform method (DTM) has been served to determine dimensionless frequencies and normalized mode shapes. DTM is a semi-analytical approach based on Taylor expansion series that converts differential equations to recursive algebraic equations. The DTM results for the natural frequencies in special cases are in very good agreement with results reported by well-known references. Also, the DTM procedure yields rapid convergence beside high accuracy without any frequency missing. Comprehensive studies to analyze the effects of crack location, crack severity, parameters of elastic foundation and boundary conditions on dimensionless frequencies as well as effects of elastic boundary conditions on cracked beams mode shapes are carried out and some problems handled for first time in this paper. Since this paper deals with general problem, the derived formulation has capability for analyzing free vibration of cracked beam with every boundary condition.
关键词: free vibration cracked beam elastic foundation restrained ends differential transform method
Free vibration analysis of cracked thin plates by quasi-convex coupled isogeometric-meshfree method
Hanjie ZHANG,Junzhao WU,Dongdong WANG
《结构与土木工程前沿(英文)》 2015年 第9卷 第4期 页码 405-419 doi: 10.1007/s11709-015-0310-1
关键词: meshfree method isogeometric analysis quasi-convex isogeometric-meshfree method free vibration cracked thin plate
Adaptive selective ES-FEM limit analysis of cracked plane-strain structures
H. NGUYEN-XUAN,T. RABCZUK
《结构与土木工程前沿(英文)》 2015年 第9卷 第4期 页码 478-490 doi: 10.1007/s11709-015-0317-7
关键词: cracked structure limit analysis von Mises criterion edge-based strain smoothing second-order cone programming adaptive
Venkadesan ARUNACHALAM,Himavathi SRINIVASAN,A. MUTHURAMALINGAM
《能源前沿(英文)》 2016年 第10卷 第4期 页码 382-392 doi: 10.1007/s11708-016-0421-y
Stability and dynamics of rotor system with 45° slant crack on shaft
Yanli LIN, Xiaohui SI, Fulei CHU
《机械工程前沿(英文)》 2011年 第6卷 第2期 页码 203-213 doi: 10.1007/s11465-011-0131-4
Crack on a shaft is one of the common damages in a rotor system. In this paper, transverse vibrations are calculated to compare the influences of transverse crack and slant crack on the rotor system. Results show that the vibration amplitude of the rotor system with a 45° slant crack on the shaft is larger than that with a transverse crack when the two types of crack have the same depth and the rotor system runs in the same condition. Stability and dynamic characteristics of the rotor system with a 45° slant crack on the shaft under torsional excitation are analyzed by considering opening and closing of the crack. It is shown that the instability of the transverse vibration of the rotor system increases with increasing difference between the bending stiffness in two main directions, and the vibration is stable when the two bending stiffness are identical. The spectrum analysis of the steady-state response reveals that the gravity and the eccentricity produce different frequency components, and when the two bending stiffness are identical, the multiple frequency components of the torsional excitation disappear. Further investigation shows that the vibration amplitudes in combined frequencies increase rapidly in transversal, torsional, and axial vibration with increasing slant crack depth. The results are helpful for the understanding the dynamic behavior of a rotor system with a slant crack on a shaft and can be used for the detection of the slant crack on a shaft.
关键词: rotor dynamics slant crack stability torsional excitation open and close
Study on wave rotor refrigerators
Yuqiang DAI, Dapeng HU, Meixia DING
《化学科学与工程前沿(英文)》 2009年 第3卷 第1期 页码 83-87 doi: 10.1007/s11705-009-0075-y
关键词: wave rotor refrigeration unsteady flow theory wave diagram
Optimization model for rotor blades of horizontal axis wind turbines
LIU Xiong, CHEN Yan, YE Zhiquan
《机械工程前沿(英文)》 2007年 第2卷 第4期 页码 483-488 doi: 10.1007/s11465-007-0084-9
关键词: population extended algorithm developed optimization accurate
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
《农业科学与工程前沿(英文)》 2018年 第5卷 第2期 页码 159-167 doi: 10.15302/J-FASE-2018216
关键词: CFD simulation downwash flow field numerical analysis plant protection six-rotor UAV
Xiaobo REN, Odd M. AKSELSEN, B?rd NYHUS, Zhiliang ZHANG
《结构与土木工程前沿(英文)》 2012年 第6卷 第3期 页码 217-223 doi: 10.1007/s11709-012-0169-3
关键词: residual stress ductile crack growth resistance complete Gurson model eigenstrain method
Jinyuan SHI,Zhicheng DENG,Yong WANG,Yu YANG
《能源前沿(英文)》 2016年 第10卷 第1期 页码 88-104 doi: 10.1007/s11708-015-0387-1
关键词: 700°C ultra-super-critical unit steam turbine very high pressure rotor structure strength design strength design criteria finite element analysis
Induction motors variable speed drives diagnosis through rotor resistance monitoring
K. YAHIA, S. ZOUZOU, F. BENCHABANE
《能源前沿(英文)》 2012年 第6卷 第4期 页码 420-426 doi: 10.1007/s11708-012-0192-z
关键词: induction motor vector control broken rotor bars (BRBs) diagnostic extended Kalman filter (EKF)
Impact analysis of compressor rotor blades of an aircraft engine
Y B SUDHIR SASTRY, B G KIROS, F HAILU, P R BUDARAPU
《结构与土木工程前沿(英文)》 2019年 第13卷 第3期 页码 505-514 doi: 10.1007/s11709-018-0493-3
关键词: axial flow compressor rotor and stator blades aircraft engine stress and impact analysis aluminum alloys
Influence of the Mechanical Seals on the Dynamic Performance of Rotor–Bearing Systems
XU Hua, ZHU Jun
《机械工程前沿(英文)》 2006年 第1卷 第1期 页码 96-100 doi: 10.1007/s11465-005-0008-5
In this paper, to consider the effects of mechanical seals, a lumped-mass model and the transfer matrix method are used to establish the equations for the dynamics performance of rotor bearing system. The general inverted iteration method is also used to solve the eigenvalue problem of these equations. To check the response of the rotor bearing system under unbalance motivation, the Gauss method is used to calculate the dynamic response of the constrained vibration. The results, based on the dynamic properties calculation of a typical mechanical spiral seal, such as stiffness coefficients and damping coefficients, exert the influence of the mechanical seal on the rotor bearing system of the high-speed machinery. Meanwhile, some structure parameters that may affect the dynamic performance and forced vibration under unbalance motivation of the rotor bearing system considering mechanical seals are analyzed in the paper. The analysis results show that the mechanical seal more or less has effects on the rotor bearing system. The mechanical seal has much more effects on the flexible rotor bearing system than on the rigid one. For instance, in a certain case, if the effects of the mechanical seal were taken into account, the system s critical speed may increase by 70 80%.
标题 作者 时间 类型 操作
Dynamics analysis of a cracked dual-disk over-hung rotor-bearing system
CHEN Hong, LI He, WEN Bang-chun, ZHANG Xiao-wei
期刊论文
Semi-analytical approach for free vibration analysis of cracked beams resting on two-parameter elastic
null
期刊论文
Free vibration analysis of cracked thin plates by quasi-convex coupled isogeometric-meshfree method
Hanjie ZHANG,Junzhao WU,Dongdong WANG
期刊论文
Adaptive selective ES-FEM limit analysis of cracked plane-strain structures
H. NGUYEN-XUAN,T. RABCZUK
期刊论文
A novel NN based rotor flux MRAS to overcome low speed problems for rotor resistance estimation in vector
Venkadesan ARUNACHALAM,Himavathi SRINIVASAN,A. MUTHURAMALINGAM
期刊论文
Stability and dynamics of rotor system with 45° slant crack on shaft
Yanli LIN, Xiaohui SI, Fulei CHU
期刊论文
Optimization model for rotor blades of horizontal axis wind turbines
LIU Xiong, CHEN Yan, YE Zhiquan
期刊论文
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
期刊论文
Influence of welding residual stresses on the ductile crack growth resistance of circumferentially cracked
Xiaobo REN, Odd M. AKSELSEN, B?rd NYHUS, Zhiliang ZHANG
期刊论文
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
期刊论文
Induction motors variable speed drives diagnosis through rotor resistance monitoring
K. YAHIA, S. ZOUZOU, F. BENCHABANE
期刊论文
Impact analysis of compressor rotor blades of an aircraft engine
Y B SUDHIR SASTRY, B G KIROS, F HAILU, P R BUDARAPU
期刊论文