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μ-Synthesis control with reference model for aeropropulsion system test facility under dynamic coupling and uncertainty

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Chinese Journal of aeronautics 2023年第10期36卷 246-261页

作者： Jiashuai LIU Xi WANG Xi LIU Meiyin ZHU Xitong PEI Song ZHANG Zhihong DAN School of Energy and Power Engineering Beihang UniversityBeijing 100191China Zhongfa Aviation Institute Beihang UniversityHangzhou 311115China Research Institute of Aero-Engine Beihang UniversityBeijing 100191China Science and Technology on Altitude Simulation Laboratory AECC(Aero Engine Corporation of China)Sichuan Gas Turbine EstablishmentMianyang 621703China

Due to the dynamic coupling and multi-source uncertainties,it is difficult to accurately control the pressure and temperature of the aeropropulsion System Test Facility(ASTF)in the presence of rapid command and large *** paper presents the design ofμ-synthesis control to solve the *** incorporating the pressure ratio into the linear equation of the control valve,the modeling error of ASTF in the low frequency range is effectively ***,an uncertain model is established by considering various factors,including parameter variations,modeling error in the low frequency range,unmodeled dynamics,and changes in the working *** address the dynamic coupling,a diagonal reference model with desired performance is incorporated intoμ-***,all weighting functions are designed according to the performance ***,theμ-controller is obtained by using the standardμ-synthesis *** results indicate that theμ-controller decouples the pressure and temperature dynamics of *** with the multivariable PI controller,integral-μcontroller,and double integral-μcontroller,the proposedμ-controller can achieve higher transient accuracy and better disturbance ***,the robustness of theμ-controller is demonstrated by Monte Carlo simulations.

关键词： aeropropulsion System Test Facility(ASTF) Decoupling Robustness μ-Synthesis Uncertainty

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Lubrication condition monitoring of journal bearings in diesel engine based on thermoelectricity

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Friction 2024年第11期12卷 2532-2547页

作者： Yuhao LV Hao LIU Zhigang CHEN Weijie CHANG Hui ZHANG Hulin LI Shanghai Jiao Tong University Shanghai 200240China National Key Laboratory of Marine Engine Science and Technology Shanghai 201108China Shanghai Marine Diesel Engine Research Institute Shanghai 201108China Hunan Aviation Powerplant Research Institute Aero Engine Corporation of ChinaHunan 412002China

There is still a lack of effective lubrication condition monitoring methods in the field of diesel *** paper proposes a novel thermoelectric approach to divide the lubrication state of ***,the generation mechanism of thermoelectric potential on bearings is ***,both experimental and simulation studies are done,and a strong correlation between lubrication and thermoelectric potential is *** film thickness and temperature are further confirmed as significant factors influencing thermoelectric ***,the thermoelectric potential increases with ***,a small film thickness ratio(when the film thickness ratio is less than 4)will suppress the thermoelectric *** typical lubrication states of bearings are distinguished through thermoelectric potential and supported by the Stribeck curve ***,the significant influence of lubrication on the bearing is confirmed through the analysis of surface morphology and composition.

关键词： journal bearing lubrication state,thermoelectric potential condition monitoring

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A review of modeling,simulation,and control technologies of altitude ground test facilities for control application

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Chinese Journal of aeronautics 2023年第9期36卷 38-62页

作者： Xitong PEI Xi WANG Jiashuai LIU Meiyin ZHU Zhihong DAN Ai HE Keqiang MIAO Louyue ZHANG Zheng XU Research Institute of Aero-Engine Beihang UniversityBeijing 100191China Science and Technology on Altitude Simulation Laboratory AECC Sichuan Gas Turbine EstablishmentMianyang 621703China School of Energy and Power Engineering Beihang UniversityBeijing 100191China Beihang Hangzhou Innovation Institute Yuhang Hangzhou 310023China Institute for Aero Engine Tsinghua UniversityBeijing 100084China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China

As the pivotal test equipment of aero-engines design,finalization,improvement,modification,etc.,the altitude Ground Test Facilities(AGTF)plays an important role in the research and development of the *** the rapid development of advanced high-performance aeroengine,the increasing demand of high-altitude simulation test is driving AGTF to improve its test ability and level of automation and *** modeling method,simulation tool,and control technology are the key factors to support the improvement of the AGTF control *** main purpose of this paper is to provide an overview of modeling methods,simulation tools,and control technologies in AGTF control system for future ***,it reviews the evolution of AGTF in the world,from the early formative stage to integration ***,the mathematical modeling method of AGTF for control application is ***,the simulation tools used in the AGTF control system are overviewed from numerical simulation to hardware-in-loop simulation and further to semi-physical ***,the control technologies used in the AGTF control system are summarized from single-variable control to multivariable integrated control,and from classical control theory to modern control ***,recommendations for future research are ***,this review article provides extensive literature information for the modeling,simulation,and control design of AGTF for control application.

关键词： altitude ground test facilities Control system Modeling and simulation Robust control Temperature and pressure control

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The Fusion Model of Catalytic Combustion and Thermal Conductivity

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Computers, Materials & Continua 2023年第1期74卷 1509-1521页

作者： Bin Lin Zhengyu Li Dong Wen Jianchao Liu Shan Yang Yong Zhou Chao Lu Qian Qiu Sichuan Normal University Chengdu610066China School of Computer Science Southwest Petroleum UniversityChengdu610500China Jackson State University Jackson39217MSUSA Key Laboratory on Aero-Engine Altitude Simulation Technology Sichuan Gas Turbine EstablishmentAECCMianyang621000China School of Power and Energy Northwestern Polytechnical UniversityXi’an710072China

The further development of catalytic elements has been plagued by activation and binary *** automatic shift model that has emerged in recent years helps components achieve full ***,the detection data still remains unstable in the shift area(7%∼13%).This paper proposes a Catalytic Combustion and Thermal Conductivity(CCTC)model for the specified range,which can be explained fromtwo aspects based on the existing *** the one hand,it uses iterative location search to process heterogeneous data,judges the prediction position of data points,and then givesweight *** the other hand,it corrects the abnormal points,determines the abnormal points in the horizontal direction,and gives the replacement value through the data of adjacent *** experimental results show that the CCTC model reduces the sum of variance from 17 of the automatic shift model to 13,and the comparison of experimental variance is reduced by 23%.In the full-scale real-time data,the experimental variance of CCTC model and automatic shift model is reduced by 18%.In conclusion,CCTC is a cross section stability framework for full-scale methane measurement,in which the specified heterogeneous combination and anomaly point correction methods improve the stability.

关键词： Catalytic combustion thermal conductivity activation problem binary problem data fusion

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Optimization of oil-cooled blade structures based on data-driven approaches

Optimization of oil-cooled blade structures based on data-dr...

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2024 International Conference on aerospace, Mechanical and Materials engineering, AMME 2024

作者： Cao, Bo Yu, Yi Sun, Jingchuan Zhang, Lina Hangzhou International Innovation Institute Beihang University Hangzhou311115 China Tianmushan Laboratory Hangzhou310023 China Research Institute of Aero-engine Beihang University Beijing China AECC Hunan Aviation Powerplant Research Institute Hunan412002 China National Key Laboratory of Science and Technology on Aero-engine Aero-thermodynamics Beihang University Beijing China

The continuous escalation of turbine inlet temperatures in aero-engine applications has rendered traditional air-cooling techniques insufficient to undertake the efficient cooling of turbine guide vanes solely. In this context, oil-cooling technology has emerged as a potent complement to air-cooling methods. The stable operating temperature limit of fuel, when used as a coolant, is merely 523 K. In contrast, turbine guide vanes operate at temperatures as high as 1, 900 K, with material allowable temperatures strictly constrained within 1, 373 K. Designing efficient and safe oil-cooled blade structures becomes paramount to the successful application of oil-cooling technology. This paper presents a layered oil-cooled turbine blade structural design scheme, which ingeniously integrates insulation and heat conduction mechanisms, effectively enhancing the oil-cooling system's adaptability to complex thermal flow environments and notably optimizing the uniformity of temperature distribution on the blade surface. Leveraging commercial simulation software, reduced order models and high-fidelity response surface models of the oil-cooled blades were constructed to conduct a parametric analysis of the layered oil-cooling structure. Under the conditions of ensuring cooling effectiveness and preventing fuel overheating, optimal design parameters for the internal structure of the layered oil-cooled turbine blades were identified, thereby establishing a comprehensive data-driven optimization methodology framework that supports thermal protection design in aero-engine. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Heat conduction

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Intention Estimation of Adversarial Spatial Target Based on Fuzzy Inference

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Intelligent Automation & Soft Computing 2023年第3期35卷 3627-3639页

作者： Wenjia Xiang Xiaoyu Li Zirui He Chenjing Su Wangchi Cheng Chao Lu Shan Yang School of Information and Software Engineering University of Electronic Science and Technology of ChinaChengdu610054China Institute of Logistics Science and Technology Beijing100166China Science and Technology on Altitude Simulation Laboratory Sichuan Gas Turbine Establishment Aero Engine Corporation of ChinaMianyang621000China Department of Chemistry Physics and Atmospheric SciencesJackson State UniversityJacksonMS 39217USA

Estimating the intention of space objects plays an important role in air-craft design,aviation safety,military and otherﬁelds,and is an important refer-ence basis for air situation analysis and command *** paper studies an intention estimation method based on fuzzy theory,combining prob-ability to calculate the intention between two *** method takes a space object as the origin of coordinates,observes the target’s distance,speed,relative heading angle,altitude difference,steering trend and etc.,then introduces the spe-ciﬁc calculation methods of these *** calculation,values are input into the fuzzy inference model,andﬁnally the action intention of the target is obtained through the fuzzy rule table and historical weighted ***-iﬁed by simulation experiment,the target intention inferred by this method is roughly the same as the actual behavior of the target,which proves that the meth-od for identifying the target intention is effective.

关键词： Intension estimation motion parameters calculation fuzzy inference fuzzy rule table historical weighted probability

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Arrangement of signal measuring points of planetary gear transmission based on dynamics simulation 15

Arrangement of signal measuring points of planetary gear tra...

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15th IEEE Global Reliability and Prognostics and Health Management Conference, PHM-Beijing 2024

作者： Yang, Weixin Liu, Feichun Xin, Tang Zhu, Rupeng AECC Hunan Aviation Powerplant Research Institute Zhuzhou China Aero-engine vibration technology in Aeronautical Science Key Laboratory Zhuzhou China Nanjing University of Aeronautics and Astronautics Nanjing China

ISBN: (纸本)9798350354010

Planetary gear box has complex structure and high failure rate. How to effectively reveal the fault characteristics of the key components in the planetary gear box and find and solve the fault in time is the focus and difficulty of current research. This paper takes the planetary gear meshing system as the research object, combines multi-body dynamics and finite element analysis, considers the transmission path of vibration signals, establishes a rigid-flexible coupling model, analyzes the characteristics and causes of the vibration signals obtained by simulation, seeks the best measuring point position of the vibration acceleration sensor, and verifies the effectiveness of the simulation model through the measured signals. © 2024 IEEE.

关键词： Gear transmissions

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Neural Machine Translation by Fusing key Information of Text

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Computers, Materials & Continua 2023年第2期74卷 2803-2815页

作者： Shijie Hu Xiaoyu Li Jiayu Bai Hang Lei Weizhong Qian Sunqiang Hu Cong Zhang Akpatsa Samuel Kofi Qian Qiu Yong Zhou Shan Yang School of Information and Software Engineering University of Electronic Science and Technology of ChinaChengdu610054China Science and Technology on Altitude Simulation Laboratory Sichuan Gas Turbine Establishment Aero Engine Corporation of ChinaMianyang621000China School of Power and Energy Northwestern Polytechnical UniversityXi’an710072China School of Computer Science Southwest Petroleum UniversityChengdu610500China Department of Chemistry Physics and Atmospheric SciencesJackson State UniversityJacksonMS 39217USA

When the Transformer proposed by Google in 2017,it was first used for machine translation tasks and achieved the state of the art at that *** the current neural machine translation model can generate high quality translation results,there are still mistranslations and omissions in the translation of key information of long *** the other hand,the most important part in traditional translation tasks is the translation of key *** the translation results,as long as the key information is translated accurately and completely,even if other parts of the results are translated incorrect,the final translation results’quality can still be *** order to solve the problem of mistranslation and missed translation effectively,and improve the accuracy and completeness of long sentence translation in machine translation,this paper proposes a key information fused neural machine translation model based on *** model proposed in this paper extracts the keywords of the source language text separately as the input of the *** the same encoding as the source language text,it is fused with the output of the source language text encoded by the encoder,then the key information is processed and input into the *** incorporating keyword information from the source language sentence,the model’s performance in the task of translating long sentences is very *** order to verify the effectiveness of the method of fusion of key information proposed in this paper,a series of experiments were carried out on the verification *** experimental results show that the Bilingual Evaluation Understudy(BLEU)score of the model proposed in this paper on theWorkshop on Machine Translation(WMT)2017 test dataset is higher than the BLEU score of Transformer proposed by Google on the WMT2017 test *** experimental results show the advantages of the model proposed in this paper.

关键词： key information transformer fusion neural machine translation

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Quantitative study of high-frequency fatigue hole-edge stresses in nickel-based single-crystal superalloy 2

Quantitative study of high-frequency fatigue hole-edge stres...

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2nd International Conference on Frontier Materials, ICFM 2023

作者： Li, Leyu Li, Zheng Liu, Jiabin Zhang, Jingang Deng, Zhiwei Li, Quanwei Liu, Xinling AECC Beijing Institute of Aeronautical Materials China AVIC Failure Analysis Center China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation China Key Laboratory of Aeronautical Materials Testing and Evaluation Aero Engine Corporation of China China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation China

In this paper, the influence of air film holes on the stress distribution of nickel-based single-crystal superalloy blades is investigated, a simulated test piece is designed for the analysis and test of the stress distribution of air film holes, and a method of quantitative inverse inference of the stress at the edge of the air film holes is proposed. Finite element simulation of high circumferential vibration fatigue of the simulated test piece was carried out by ANSYS to obtain the gradient of stress distribution at the hole edge. The EBSD technique was used to measure the dimensions of the plastic zone in the region near the fracture, and the quantitative fatigue stresses were extrapolated using a crack tip plastic zone model with Tresca yield criterion. The compressive stress exerted by the femtosecond laser perforation method on the air film aperture wall was detected by the nanoindentation technique, and the residual stress was analysed using the S. Suresh computational model. The results of this study show that based solely on finite element simulation, it is not possible to completely simulate the effect of residual stresses caused by machining on fatigue fracture, which in turn leads to a lack of conformity between the results of finite element simulation and the results of the inverse plastic zone size extrapolation;however, the stress magnitude at the edge of the hole can be well computed by combining the stress concentration coefficients from finite element simulation with the stresses from the inverse plastic zone size extrapolation after taking into account the residual stresses from machining. The quantitative analysis results of this method have an error within 1.3 times the dispersion band compared to the test data. © 2023 Published under licence by IOP Publishing Ltd.

关键词： Nickel

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Research on the Loosening Mechanism of the Rotor with Curvic Couplings in Aircraft engines 7th

Research on the Loosening Mechanism of the Rotor with Curvic...

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7th China aeronautical science and technology Conference, CASTC 2024

作者： Jing, Xiaoming Zha, Hong Liu, Zhenchen Mei, Shun Wang, Fang China AECC Hunan Aviation Powerplant Research Institute Zhuzhou412002 China Hunan Key Laboratory of Turbo Machinery on Small and Medium Aero-Engine Zhuzhou412002 China National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology Nanchang Hangkong University Nanchang330063 China

ISBN: (纸本)9789819797738

Understanding the mechanism of rotor looseness in aircraft engines and the characterization of the corresponding rotating mechanical parameters play an important role in quickly diagnosing technical problems about rotor looseness and improving the stability design of the rotor. Taking a certain rotor with curvic couplings as the research object, this paper analyzed the mechanism of the influence of preload and loosening changes on the stability of the rotor structure by applying the validation methods of numerical simulation and modal test. The results showed that the changing trends in simulation calculation and modal test were the same. When the preload of the rotor decreased, the stiffness of curvic couplings sharply decreased, and the critical bending speed of the rotor decreased significantly. Therefore, when the rotor with curvic couplings became loose, its operating characteristics indicated a typical resonance instability phenomenon. In rotor dynamic property design, the stiffness of the rotor with curvic couplings should be designed according to the minimum preload during the operating process. Before installation tests, modal tests should be conducted on rotors with different preload states to obtain the minimum allowable preload value during operation and verify whether the design meets the application requirement. © Chinese Society of aeronautics and Astronautics 2025.

关键词： Modal analysis

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