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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. 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.

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

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Rotation errors in numerical manifold method and a correction based on large deformation theory

Ning ZHANG, Xu LI, Qinghui JIANG, Xingchao LIN

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 5, Pages 1036-1053 doi: 10.1007/s11709-019-0535-5

Abstract: method, the governing equation is derived using Green strain, the large deformation iteration and the open-close

Keywords： numerical manifold method rotation large deformation Green strain open-close iteration

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Characterising populations living close to intensive farming and composting facilities in England

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 3, doi: 10.1007/s11783-020-1332-z

Abstract:

• Bioaerosol emitted from farming and composting facilities may pose health risks.

Keywords： Composting Intensive farming Bioaerosol Population characteristics Public health

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Atomic and close-to-atomic scale manufacturing—A trend in manufacturing development

Fengzhou FANG

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 4, Pages 325-327 doi: 10.1007/s11465-016-0402-1

Abstract: scope of conventional theory; rather, it is based on new principles and theories at the atomic and/or close-to-atomic

Keywords： atomic manufacturing Manufacturing 3.0 Manufacturing 2025 Industry 4.0

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Design and analyses of open-ended pipe piles in cohesionless soils

Yuan GUO,Xiong (Bill) YU

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 1, Pages 22-29 doi: 10.1007/s11709-016-0314-5

Abstract: Large open-ended pipe pile has been found to be advantageous for use in transportation projects.To close this practice gap, this paper first summarized different design methods for open-ended pipeTo close the knowledge gap, discrete element method (DEM) was used to simulate the soil plugging process

Keywords： open-ended pipe pile soil plug DEM base capacity

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Thermal response of steel framing members in open car park fires

Xia YAN; Marion CHARLIER; Thomas GERNAY

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 9, Pages 1071-1088 doi: 10.1007/s11709-022-0879-0

Abstract: For open car park structures, adopting a performance-based structural fire design is often justifiedThis paper describes a numerical study on the thermal exposure on steel framing members in open car park

Keywords： open car park localized fire steel frame numerical modeling computational fluid dynamics

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NC flame pipe cutting machine tool based on open architecture CNC system

Xiaogen NIE, Yanbing LIU

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 2, Pages 147-152 doi: 10.1007/s11465-009-0025-x

Abstract: The paper deals with the design and implementation of an open architecture CNC system for the NFPCM,Further, the paper develops the program and sets up the open and module NC system.

Keywords： flame pipe cutting flame incision tracks CNC open architecture CNC system

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Cavitation in semi-open centrifugal impellers for a miniature pump

LUO Xianwu, LIU Shuhong, ZHANG Yao, XU Hongyuan

Frontiers in Energy 2008, Volume 2, Issue 1, Pages 31-35 doi: 10.1007/s11708-008-0011-8

Abstract: Cavitation in miniature pumps was investigated experimentally for two semi-open centrifugal impellerssimilar cavitation performances as an ordinary-size pump, with the cavitation performance of the semi-openAlso, both the hydraulic and cavitation performance of the semi-open impeller were improved by the leaned

Keywords： cavitation performance semi-open impeller increased two-dimensional efficiency

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Evaluation of the harmonic scalpel in open surgery for abdominal aortic aneurysm

Zeyu Wu, Zhe Chen, Lin Peng

Frontiers of Medicine 2012, Volume 6, Issue 1, Pages 85-88 doi: 10.1007/s11684-012-0174-x

Abstract: During the last few years, many surgeons have begun to use the harmonic scalpel in open surgery.The aim of the present study is to determine the value of the harmonic scalpel in open operation forA total of 153 patients who underwent open surgery for AAA at the Department of Vascular Surgery of GuangdongOpen surgery performed with the harmonic scalpel on 105 patients was compared with open operation usingThe harmonic scalpel is a safe and minimally invasive tool in open surgery for AAA and is associated

Keywords： abdominal aortic aneurysm harmonic scalpel minimally invasive

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Experimental study on flow behavior at open channel confluences

WANG Xiekang, WANG Xianye, LU Weizhen, LIU Tonghuan

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 2, Pages 211-216 doi: 10.1007/s11709-007-0025-z

Abstract: Channel confluences are common in natural rivers and hydraulic engineering, and the flow behavior at confluences becomes very complex because of the interaction between the tributary and the main river. In this study, the experiments were performed in a combined flume with a 30º angle between the main and tributary flume located at Sichuan University. The velocity was measured by using a three-component acoustic Doppler velocimeter (ADV) over a grid defined throughout the junction region. Based on the analysis of the velocity at the confluence, the distinctive characteristics of a channel confluence flow may be divided into several zones including a zone of separation immediately downstream of the junction branch channel, the maximum and minimum velocity regions at the upstream and downstream in the confluent channel, and a shear plane developed between the two combining flows downstream of the confluent channel. In addition, secondary circulations in different directions at the higher and lower velocity zones are observed as well.

Keywords： ADV different interaction separation downstream

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Effects of inner sleeves on the inner frictional resistance of open-ended piles driven into sand

Janaka J. KUMARA,Yoshiaki KIKUCHI,Takashi KURASHINA,Takahiro YAJIMA

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 4, Pages 499-505 doi: 10.1007/s11709-016-0335-0

Abstract: In open-ended piles, inner friction is developed between inner pile shaft and the inner soil.

Keywords： bearing capacity inner frictional resistance inner sleeve open-ended piles soil plugging

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Analysis of stress and failure in rock specimens with closed and open flaws on the surface

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 5, Pages 1222-1237 doi: 10.1007/s11709-021-0773-1

Abstract: The influence of closed and open surface flaws on the stress distribution and failure in rock specimensThe simulated specimens include those with closed flaws and those with open flaws on the surface.results show significant differences in the stress, displacement, and failure behavior of the closed and openAccording to the results, when compression is the dominant mode of stress applied to the flaw surface, an openarticle suggest that failure at the rock surface may be managed in a favorable manner by fabricating open

Keywords： surface flaw heterogeneity circular hole numerical modeling relative displacement

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Enhancement of open circuit voltage in organic solar cells by doping a fluorescent red dye

Qing LI, Junsheng YU, Yue ZANG, Nana WANG, Yadong JIANG

Frontiers in Energy 2012, Volume 6, Issue 2, Pages 179-183 doi: 10.1007/s11708-012-0177-y

Abstract: The open circuit voltage ( ) of small-molecule organic solar cells (OSCs) could be improved by doping

Keywords： organic solar cells (OSCs) open circuit voltage fluorescent dye doping 4-(dicyanomethylene)-2-t-butyl

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Frost heave and freezing processes of saturated rock with an open crack under different freezing conditions

Zhitao LV, Caichu XIA, Yuesong WANG, Ziliang LIN

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 4, Pages 947-960 doi: 10.1007/s11709-020-0638-z

Abstract: Frost heave experiments on saturated sandstone and tuff with an open crack are conducted under uniformreasons for this phenomenon, a numerical model on the freezing processes of saturated rock with an open

Keywords： frost heave rock with crack freezing process freezing condition frost heave mode

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An integrated optimization and simulation approach for air pollution control under uncertainty in open-pit

Zunaira Asif, Zhi Chen

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 5, doi: 10.1007/s11783-019-1156-x

Abstract: Air Pollution Control model is developed for open-pit metal mines.Open-pit metal mines contribute toward air pollution and without effective control techniques manifestsThe applicability of the optimized model is explored through an open-pit metal mine case study, in North

Keywords： Air pollution Decision analysis Linear programming Mining Optimization Fuzzy Monte Carlo