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Assessment of fatigue life of remanufactured impeller based on FEA

Lei XU,Huajun CAO,Hailong LIU,Yubo ZHANG

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 3, Pages 219-226 doi: 10.1007/s11465-016-0394-x

Abstract: Results showed that the load amplitude greatly affected fatigue life, the impeller was protected from

Keywords： remanufactured impeller fatigue life impeller failures finite element analysis (FEA)

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Mesoscale fabrication of a complex surface for integral impeller blades

Xibin WANG,Tianfeng ZHOU,Lijing XIE,Li JIAO,Zhibing LIU,Zhiqiang LIANG,Pei YAN

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 1, Pages 116-131 doi: 10.1007/s11465-017-0426-1

Abstract:

Integral impeller is the most important component of a mini-engine.However, the machining of a mesoscale impeller with a complex integral surface is difficult because ofFor the fabrication of a complex integral impeller, a micro-ball-end mill is designed in accordance withSubsequently, fractal theory is applied to characterize the surface quality of the integral impeller.The fractal theory-based characterization shows that the completed mesoscale integral impeller exhibits

Keywords： mesoscale fabrication micro-milling tool mesoscale milling impeller blade

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Damage mechanism and evaluation model of compressor impeller remanufacturing blanks: A review

Haiyang LU, Yanle LI, Fangyi LI, Xingyi ZHANG, Chuanwei ZHANG, Jiyu DU, Zhen LI, Xueju RAN, Jianfeng LI, Weiqiang WANG

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 4, Pages 402-411 doi: 10.1007/s11465-019-0548-8

Abstract: Large centrifugal compressor impeller blanks were used as the study object.For ultra-high cycle fatigue damage, the characteristics of ultra-high cycle fatigue of the impellerFor erosion wear, the flow field of gas-solid two-phase flow inside the impeller was simulated, and theFor corrosion damage, the electrochemical and stress corrosion behaviors of the impeller material and

Keywords： remanufacturing centrifugal compressor impeller remanufacturing blank damage mechanism evaluation model

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Interpreting the vulnerability of power systems in cascading failures using multi-graph convolutional Research Article

Supaporn LONAPALAWONG, Changsheng CHEN, Can WANG, Wei CHEN

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 12, Pages 1848-1861 doi: 10.1631/FITEE.2200035

Abstract: Analyzing the of in is generally regarded as a challenging problem. Although existing studies can extract some critical rules, they fail to capture the complex subtleties under different operational conditions. In recent years, several deep learning methods have been applied to address this issue. However, most of the existing deep learning methods consider only the grid topology of a power system in terms of topological connections, but do not encompass a power system's spatial information such as the electrical distance to increase the accuracy in the process of graph convolution. In this paper, we construct a novel power- that uses power system topology and spatial information to optimize the edge weight assignment of the line graph. Then we propose a multi-graph convolutional network (MGCN) based on a graph classification task, which preserves a power system's spatial correlations and captures the relationships among physical components. Our model can better handle the problem with that have parallel lines, where our method can maintain desirable accuracy in modeling systems with these extra topology features. To increase the interpretability of the model, we present the MGCN using layer-wise relevance propagation and quantify the contributing factors of model classification.

Keywords： Power systems Vulnerability Cascading failures Multi-graph convolutional networks Weighted line graph

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Dams and Floods

F. Lempérière

Engineering 2017, Volume 3, Issue 1, Pages 144-149 doi: 10.1016/J.ENG.2017.01.018

Abstract:

The possible mitigation of floods by dams and the risk to dams from floods are key problems. The People’s Republic of China is now leading world dam construction with great success and efficiency. This paper is devoted to relevant experiences from other countries, with a particular focus on lessons from accidents over the past two centuries and on new solutions. Accidents from floods are analyzed according to the dam’s height, storage, dam material, and spillway data. Most of the huge accidents that have been reported occurred for embankments storing over 10 hm³. New solutions appear promising for both dam safety and flood mitigation.

Keywords： Floods Flood mitigation Spillways Labyrinth spillways Dam failures

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Optimal ratio of bend channel in centrifugal compressor

WEN Suping, HU Xiaowen, LI Tingbin, ZHANG Yong, WANG Jun

Frontiers in Energy 2008, Volume 2, Issue 4, Pages 381-385 doi: 10.1007/s11708-008-0084-4

Abstract: A numerical investigation on the flow in a bend channel by coupling the impeller with the vaneless diffuserThe jet-wake effect of the impeller outlet is considered and flow pattern in the bend channel and the

Keywords： specific compressor different centrifugal compressor pressure impeller

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Fragility assessment of wood sheathing panels and roof-to-wall connections subjected to wind loading

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4, Pages 867-876 doi: 10.1007/s11709-021-0745-5

Abstract: The performance of the wood-frame buildings after tornadoes has shown that the majority of the wind damage resulted from building envelope failure most typically due to the loss of the roof. To assess the performance and the reliability of low-rise wood-frame residential buildings with a focus on the roofs, fragility analysis can be used to estimate the probability of failure of a roof when constructed with specified nails and sheathing sizes. Thus, this paper examines the fragility of specific types of nails, roof-to-wall (RW) connection details, and sheathing sizes based on the damaged roofs that were previously assessed in the Dunrobin area in Ottawa (Ontario) that was hit with an Enhanced Fujita (EF3) tornado on September 21, 2018. The presented fragility analysis considers four scenarios, including different sheathing and nail sizes. Dead loads, wind loads, and resistance on the sheathing panels were compiled and analyzed to determine the failure of the examined roofs. The eight fragility models suggest that the safest roof sheathing (RS) is the 1.22 m × 1.22 m sheathing panel with 8 d nails, and the safest RW connections is achieved by using H2.5 hurricane clips.

Keywords： tornadoes wind loads low-rise buildings fragility analysis risk assessment structural failures

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Five-axis rough machining for impellers

Ruolong QI, Weijun LIU, Hongyou BIAN, Lun LI

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 1, Pages 71-76 doi: 10.1007/s11465-009-0010-4

Abstract: An impeller is one of the most important components that is difficult to machine because of its twisted

Keywords： five-axis impeller tool-path planning flank milling ruled surface

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Noise reduction for centrifugal fan with non-isometric forward-swept blade impeller

MA Jianfeng, QI Datong, MAO Yijun

Frontiers in Energy 2008, Volume 2, Issue 4, Pages 433-437 doi: 10.1007/s11708-008-0082-6

Abstract: To reduce the noise of the T9-19No.4A centrifugal fan, whose impeller has equidistant forward-swept blades

Keywords： different reference aerodynamic performance centrifugal impeller

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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: Although both impellers had the same blade cross-section, one impeller had a two-dimensional blade, whileThe average cavitation performance of each impeller was satisfactorily predicted by the numerical simulationscavitation performances as an ordinary-size pump, with the cavitation performance of the semi-open impellerAlso, both the hydraulic and cavitation performance of the semi-open impeller were improved by the leanedThe results also show that uniform flow upstream of the impeller inlet will improve the cavitation performance

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