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A post-treatment to reduce stress concentration sensitivity under intermediate-temperature fatigue in GH4169: High-energy impact composite modification

Transactions of Materials Research

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Transactions of Materials Research 2025年第3期1卷

作者： Guoxin Lu Qiang Wang Bonnie Attard Arif Rochman Guofang Zhang Luqing Cui Zhong Ji Glenn Cassar MOE Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Shandong University Jinan 250061 China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material AECC Beijing Institute of Aeronautical Materials Beijing 100095 China Department of Metallurgy and Materials Engineering University of Malta MSD 2080 Malta Institute of Engineering and Transport The Malta College of Arts Science & Technology PLA 9032 Malta National Key Lab of Aerospace Power System and Plasma Technology Xi’an Jiaotong University Xi’an 710049 China

The study focuses on a novel post-treatment method, high-energy impact composite modification, combining mechanical shot peening and laser shock processing to improve the fatigue performance of the nickel-based superalloy GH4169 at intermediate temperatures. The synergistic interaction between mechanical impact (SP-induced plastic deformation) and laser-induced shock waves enabled a 2.5-fold increase in effective treatment depth (up to 1500 μm) compared to SP alone (400 μm), while achieving a surface hardness of 520 HV and compressive residual stress of −1465 MPa, exceeding single-process results by 4.5% and 54.2%, respectively. The dual-impact approach significantly enhanced surface hardness and compressive residual stress, addressing the high sensitivity to stress concentration. Experimental results demonstrate that HEICM eliminated stress concentration sensitivity at 650 °C, elevating the fatigue limit of notched specimens (Kt = 3) to 638 MPa – equivalent to the fatigue strength of smooth specimens (Kt = 1) in conventional grinding states (636 MPa). This represents a 116% improvement over untreated notched specimens (295 MPa) and surpasses SP-treated counterparts (446 MPa) by 43%, thereby extending the fatigue life of GH4169 alloys in aerospace applications.

关键词： Composite modification Shot peening Surface strengthening Superalloy High-cycle fatigue

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Capability Analysis of Linear Extended State Observer Under Model Mismatch for LADRC control

Capability Analysis of Linear Extended State Observer Under ...

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第40届中国控制会议

作者： Yuan-Tai Chen Xian Du Si-Xin Wen Xi-Ming Sun Yan-Yan Liu School of Control Science and Engineering Dalian University of Technology Key Laboratory of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education Dalian University of Technology Key Laboratory of Ocean Energy Utilization and Energy Conservation (Dalian University of Technology) Ministry of Education Jiangsu Province Key Laboratory of Aerospace Power System AECC Shenyang Engine Research Institute

The Linear Extended State Observer(LESO) with model mismatch for Linear Active Disturbance Rejection Control(LADRC) is investigated in this paper,which is different from the existed results that only consider the unknown *** only the uncertain disturbances in system are considered,but the model mismatch between the observer and the actual system is also *** Bounded-Input Bounded-Output stability scheme,the observer is analyzed in the time domain,and the observer error under a certain degree model mismatch is *** is proved that for LESO,the observer error caused by the model mismatch is bounded and related to the bandwidth(ω),and the error caused by model mismatch can be decreased by increasing bandwidth of the observer.

关键词： Extended State Observer model mismatch Bounded-Input Bounded-Output asymptotic stability

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Temperature prediction of generator carbon brush based on LSTM neural network

Temperature prediction of generator carbon brush based on LS...

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2021 China Automation Congress, CAC 2021

作者： Zhang, Qing Jiao, Tingyang Ma, Yinxing Zhang, Youmin Wu, Xiaohui Wu, Pengyue Shaanxi Key Laboratory of Complex System Control and Intelligent Information Processing Xi'an University of Technology Xi'an710048 China The Faculty of Computing Science The University of Alberta EdmontonABT6G 2R3 Canada Shaanxi Key Laboratory of Complex System Control and Intelligent Information Processing Xi 'an University of Technology Xi'an710048 China Department of Mechanical Industrial and Aerospace Engineering Concordia University MontrealQCH3G 1M8 Canada Huaneng Weihai Power Generation Co. Ltd Weihai264200 China Xi 'an Thermal Power Research Institute Co. Ltd Xi'an710048 China

ISBN: (纸本)9781665426473

In order to improve the prediction accuracy of the carbon brush temperature trend of the generator, analyzing the operating state of the generator more accurately, and reduce other accidents like the unplanned outage caused by carbon brush failure of the generator in the power plant. A multi-step temperature prediction model based on the LSTM (Long Short-Term Memory) neural network is proposed. The data comes from real operating carbon brush temperature of Weihai power Plant in ten days. Then the temperature prediction model is established to achieve an accurate prediction of the carbon brush temperature in the future day. The prediction error is stable within 0.4 °C. By comparing the predicted results of the BP model and Elman model, the error between the predicted results of each model and the actual temperature data is analyzed. By comparing the indicators and analyzing the actual curves, the results show that LSTM neural network has higher accuracy in predicting the temperature of generator carbon brush. This method is of reference significance for the accurate analysis of the operation state of the generator and the load analysis of the excitation system. © 2021 IEEE

关键词： Long short-term memory

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Maximum Torque per Ampere Control with Inductance and Field Current Estimation for Wound-Rotor Synchronous Starter/Generator

Maximum Torque per Ampere Control with Inductance and Field ...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Yuduo Zhang Weiguo Liu Qian jia Ningfei Jiao Ji Pang Northwestern Polytechnical University Xi'an China Aviation Key Laboratory of Science and Technology on Aerospace Power Systems Xi'an China

ISBN: (数字)9784886864192

ISBN: (纸本)9781728189307

The machine's parameter changes due to the working condition. While inaccurate parameters can lead to abnormal control performance of the electrical machine. This paper proposes an online inductance and field current estimation method combining the Maximum Torque per Ampere (MTPA) Control Strategy for the three-stage wound-rotor synchronous rotor/generator (WRSSG). By using the extended Kalman filter (EKF), the instantaneous inductance and field current are estimated, and then used in the MTPA calculation. The mathematical equations are established for analyzing the dynamic response of these parameters. The simulation results verify the effectiveness of this method.

关键词： Torque Mathematical model Stators Inductance Estimation Aircraft Aircraft propulsion

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Rotating Rectifier Failure Detection for Brushless Synchronous Starter/Generator in the Generator Mode

Rotating Rectifier Failure Detection for Brushless Synchrono...

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Annual Conference of Industrial Electronics Society

作者： Chenghao Sun Weiguo Liu Xiaoli Duan Xu Han Rui Wang Ningfei Jiao Northwestern Polytechnical University Xi’an China Aviation Key Laboratory of Science and Technology on Aerospace Power Systems Xi’an China

ISBN: (数字)9781728154145

ISBN: (纸本)9781728154152

A novel failure detection method for rotating rectifier of the brushless synchronous starter/generator in the generator mode has been proposed. In this method, the terminal voltage of the idle field winding of the main exciter is used. Firstly, the first maximum voltage and corresponding position in the voltage sample sequence are obtained. On this basis, the voltage sample sequence is reconstructed into two sequences to acquire the second maximum voltage. Then the voltage ratio is calculated for failure detection. Experimental results verify the feasibility and effectiveness of the proposed method.

关键词： Rectifiers Windings Generators Fault detection Circuit faults Rotors Stator windings

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Online MTPA Control of Wound Rotor Start-Generator Drives Considering Cross-Coupling Effect

Online MTPA Control of Wound Rotor Start-Generator Drives Co...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Ji Pang Ningfei Jiao Xiaoli Duan Yuduo Zhang Weiguo Liu Chenghao Sun Northwestern Polytechnical University Xi'an China Aviation Key Laboratory of Science and Technology on Aerospace Power Systems Xi'an China

ISBN: (数字)9784886864192

ISBN: (纸本)9781728189307

The cross-coupling effect is the most common phenomenon in the electric machinery operation, it has the influence on the machine efficiency and control scheme. However, the cross-coupling effect is ignored by the existing Virtual Signal Injection (VSI) Maximum Torque Per Ampere (MTPA) control. In this paper the online MTPA control based on the VSI scheme for Integrated Starter/Generator (ISG) system considering the cross-coupling effect is proposed. The simulations are carried out to verify the effectiveness of the proposed control scheme.

关键词： Torque Mathematical model Inductance Rotors Electrical engineering Conferences Aircraft

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Design method with controllable velocity direction at throat for inward-turning inlets

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Chinese Journal of Aeronautics 2019年第6期32卷 1403-1415页

作者： Wenyou QIAO Anyuan YU Wei GAO Weixing WANG Research Center of Combustion Aerodynamics Southwest University of Science and TechnologyMianyang 621010China Jiangsu Province Key Laboratory of Aerospace Power System Nanjing 210016China Science and Technology on Scramjet Laboratory of Hypervelocity Aerodynamics Institute China Aerodynamics Research and Development CenterMianyang 621000China College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

In the design of a hypersonic inward-turning inlet by applying the traditional basic flowfield, a reflected shock-wave is formed in the isolator due to the continuous reflection of the cowlreflected shock wave in the basic flow-field, which interacts with the boundary layer to produce a considerable influence on the performance of the inlet. Here, a basic flow-field design method that can control the velocity direction at the throat section is developed, and numerical simulations are conducted to demonstrate the effectiveness of this method. The method presented in this paper can achieve the absorption of the reflected waves at the shoulder of the basic flow-field by adjusting the variation law of the center radius in the basic flow-field, and a smooth transition between the compression surface and the isolator can also be produced. The Mach number and total pressure recovery coefficient of the inlet designed according to this method are 3.00 and 0.657, respectively, at design point(the incoming flow Mach number Ma1= 6.0). The results show that with this method, the inlet can efficiently weaken both the reflection of the shock wave and the interaction between the boundary layer and the reflected shock waves, which improves the aerodynamic performance of the inlet.

关键词： Hypersonic Inverse design Inward-turning inlet Method of characteristic Shock wave

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Modeling Soybean Cultivation Suitability in China and its Future Trends in Climate Change Scenarios

SSRN

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SSRN 2023年

作者： Zhu, Qinyan Wang, Fumin Yi, Qiuxiang Zhang, Xiaoyang Chen, Siting Zheng, Jueyi Li, Jiale Xu, Tianyue Peng, Dailiang Institute of Applied Remote Sensing & Information Technology Zhejiang University Hangzhou310058 China Key Laboratory of Agricultural Remote Sensing and Information System Zhejiang University Hangzhou310058 China School of Geomatics and Municipal Engineering Zhejiang University of Water Resources and Electric Power Hangzhou311228 China Geospatial Sciences Center of Excellence Department of Geography & Geospatial Sciences South Dakota State University BrookingsSD57007 United States Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health Zhejiang University Hangzhou310058 China Key Laboratory of Digital Earth Science Aerospace Information Research Institute Chinese Academy of Sciences Beijing100094 China

Soybean is an important source of oil and vegetable protein and plays a key role in agricultural production and economy. A suitability evaluation of soybean cultivation is important for identifying potential soybean planting areas. Based on the raster data of soybean harvest ratio (FSHA) and climate-soil-topographic environmental factors, we used MaxEnt to simulate the soybean planting suitability and potential distribution in China and the future trends of soybean cultivation under climate change. The result shows that the suitability of soybean cultivation was primarily influenced by elevation, precipitation of warmest quarter, capacity of the clay fraction, slope, mean diurnal temperature range, accumulated temperature ≥10℃, solar radiation and topsoil gravel content. High-suitability and moderate-suitability area are respectively 44.61 Mha and 71.12 Mha in China. High-suitability areas for soybean are mainly concentrated in the Northeast Plain, the North China Plain and the northern parts of the middle and lower Yangtze River plain. There were many provinces with high soybean planting potential but low development degrees, including Hebei, Henan, Shandong, Tianjin, Jilin, Liaoning, Jiangsu, Hubei and Shaanxi. Under future climate scenarios (SSP126, SSP245 and SSP585) of multiple global circulation models in CMIP6, the area highly or moderately suitable for soybean cultivation is generally stable, while low suitability area shows growth evidently. The total increase of three suitability area is the most obvious under SSP245 during 2021-2040, accounting for more than 5% in the base of historical data. In the future, most parts of Northeast China (eastern Inner Mongolia, Heilongjiang and eastern and northern Jilin), parts of north-central China (northern Hebei, northern Shanxi and Shaanxi) and parts of southwest China (eastern Sichuan, Chongqing, northern Guizhou and Yunnan) may be more suitable for soybean cultivation. This study provides a practical reference for

关键词： Climate change

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Dynamic Transient power Allocation Strategy in On/Off-Grid DC Microgrid

Dynamic Transient Power Allocation Strategy in On/Off-Grid D...

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IEEE Student Conference on Electric Machines and systems

作者： Kabindra Pokharel Sonee Sapkota Weilin Li Donghua Wu Ming Yan Yi Wang School of Automation Northwestern Polytechnical University Xi’an China Aviation Key Laboratory of Science and Technology on Aerospace Power System Shaanxi Aero Electric Co. Ltd. Xi’an China

ISBN: (数字)9781728156224

ISBN: (纸本)9781728156231

For on/off-grid DC microgrid, this paper proposes an improved droop control strategy combined with DC bus signaling to split transient and average load power between supercapacitor (SC), battery, and grid. SC converter with virtual impedance droop is responsible for supplying transient load power, whereas battery converter and grid rectifier, both with virtual resistor droop, are responsible for additional average load power in off-grid and on-grid modes, respectively. DC bus signaling is implemented for the smooth transition of DC microgrid from off-grid to on-grid state. The working methods for the proposed control strategy and the design of the system are explained, and theoretical analyses are verified by simulations.

关键词： Rectifiers Microgrids Supercapacitors Dynamic scheduling Batteries Resource management Transient analysis

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Dynamic Transient power Sharing in Grid-Connected DC Microgrid

Dynamic Transient Power Sharing in Grid-Connected DC Microgr...

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Sustainable power and Energy Conference (iSPEC)

作者： Kabindra Pokharel Sonee Sapkota Yufeng Wang Zhen Kang Ming Huang Weilin Li Donghua Wu Ming Yan Kai Fan Yi Wang School of Automation Northwestern Polytechnical University Xi'an China Aviation Key Laboratory of Science and Technology on Aerospace Power System Shaanxi Aero Electric Co. Ltd. Xi'an China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

This paper proposes an extended droop control strategy for dynamic transient power-sharing between supercapacitor (SC) and AC grid to manage the power demand in the DC microgrid. The proposed control strategy utilizes a virtual impedance droop structure with the SC converter and a virtual resistor droop structure with the grid rectifier, which are responsible for splitting the load power into transient and average load power, respectively. Load transient caused by a sudden change in the load is buffered by supercapacitor and additional average load power demand is supplied by the grid. The working methods of the proposed control strategy and the design of the system are explained, and theoretical analyses are verified by simulations.

关键词： power demand Rectifiers Microgrids Supercapacitors Dynamic scheduling Resource management Transient analysis

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