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CSAA/IET International Conference on Aircraft utility systems 2020, AUS 2020

作者： Qilong, Tian Xiaobo, Zhang Zongta, Cui Rongxia, Hu Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing211106 China Nanjing Engineering Institute of Aircraft Systems AVIC Nanjing211106 China

ISBN: (纸本)9781839535635

The aero fuel pump is a significant accessory for aircraft fuel system. To enhance the anti-cavitation capability of the pump and reduce hydraulic loss, the paper try to combine the inducer and impeller. Three centrifugal pump combination impellers were designed with different wrap angle. The impact of the wrap angle on the pump hydraulic performance was numerically performed and analyzed by using a computational fluid dynamics code based on the Realizable k-Ε turbulence model, in which the influence of rotation and curvature are considered. The simulation results predicted indicate that the inducer and impeller combination can increase the hydraulic efficiency. In addition, this combination can reduce the inlet flow rate and increase the inlet pressure, enhance the anti-cavitation capability of the centrifugal pump. As the wrap angle increases, the pump pressurization values and efficiency increases first and then decreases. In addition, the maximum hydraulic efficiency point gradually shifts to a smaller flow rate. Therefore, it can be inferred that when the impeller parameters are basically determined, there must be an optimal blade wrap angle. Furthermore, current study new impeller form for further study of design of aero fuel centrifugal pumps. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Cavitation

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Application of machine learning in the design of aircraft fuel pump

Application of machine learning in the design of aircraft fu...

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CSAA/IET International Conference on Aircraft utility systems 2020, AUS 2020

作者： Cui, Zongtai Tian, Qilong Cao, BoJun Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing211106 China Nanjing Engineering Institute of Aircraft Systems AVIC Nanjing211106 China

ISBN: (纸本)9781839535635

The aircraft fuel pump is the core component of the aircraft fuel system In traditional design progress of the aircraft fuel pump, CAE, CFD and other FEA methods are often used to evaluate the quality of the design plan, but the FEA methods have some problems, such as time-consuming, cost of computational resources, etc. The design plan possesses the characteristics of more variables, more parameters coupled and complex formula form, and the solution efficiency directly affects the process of the product design. In order to accelerate design process, in this paper, a numerical regression model based on machine learning algorithms is presented for assessment of the design plan. This model takes the data obtained by traditional physical test for a certain aircraft fuel pump as samples. The test results show that machine learning algorithms can provide solutions of high precision with a significant improvement of computational efficiency when compared with the traditional FEA approach. Several kinds of machine learning algorithms were introduced to predict and analyze real physical model of the pump. Among these algorithms, the SVR-RBF has the best performance with respect to the accuracy and efficiency. Furthermore, current study provides a feasible and efficient technical approach for further study of design of aircraft fuel pumps. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Efficiency

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Temperature Analysis of Permanent Magnet Synchronous Motor Based on Iterative Calculation of Boundary Heat Transfer

Temperature Analysis of Permanent Magnet Synchronous Motor B...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Qianqian Liu Yaohua Hu Renhua Jiang Shushu Zhu Junyue Yu College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems Nanjing China AVIC Leihua Electronic Technology Research Institute Wuxi China

ISBN: (数字)9781665493024

ISBN: (纸本)9781665493031

Accurate calculation of heat dissipation coefficient is an important prerequisite to improve the accuracy of motor temperature. Due to the influence of motor structure and ambient temperature, the heat dissipation coefficient is difficult to calculate accurately. In this paper, a method by calculating the boundary heat transfer conditions iteratively is studied to get the heat dissipation coefficient of the motor surface. The influence of different ambient temperatures on the heat dissipation coefficient is analyzed. The influence of the heat dissipation coefficient solved by the iterative method and the traditional empirical formula on the accuracy of the finite element temperature calculation model are compared. The validity of iterative method is verified. Finally, the accuracy of the iterative method to calculate the heat dissipation coefficient is verified by experiments.

关键词： Rails Temperature distribution Solid modeling Atmospheric modeling Permanent magnet motors Synchronous motors Finite element analysis

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Sliding Mode Observation and Control for Overhead Cranes with Varying Rope Length

Sliding Mode Observation and Control for Overhead Cranes wit...

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2021 China Automation Congress, CAC 2021

作者： Huan, Xuwei Niu, Dan Li, Qi Yang, Jun Liu, Guoyao Chen, Xisong Xiao, Xi Key Laboratory of Measurement and Control of CSE Ministry of Education Southeast University Nanjing China Department of Aeronautical and Automotive Engineering Loughborough University LoughboroughLE11 3TU United Kingdom Nanjing Sciyon Automation Group Co. Ltd Nanjing China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

ISBN: (纸本)9781665426473

This paper proposes a state observer and controller based on the second-order sliding mode scheme for underactuated overhead cranes with load hoisting and lowering. The designed state observer can effectively estimate the uncertainly and unmodeled dynamics of crane systems, and provide appropriate driving force compensations for the sliding mode controller designed by coupling the load swing angle. This guarantees an accurate load positioning and residual swing elimination. Based on the Lyapunov stability criterion, the asymptotic stability of the control system is proved Several simulations are implemented to verify the effectiveness and robustness of the proposed controller for anti-sway and positioning controls. © 2021 IEEE

关键词： Asymptotic stability

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Research on nitrogen enriched air flow of on-board inert gas generating system

Research on nitrogen enriched air flow of on-board inert gas...

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CSAA/IET International Conference on Aircraft utility systems 2020, AUS 2020

作者： Yangyang, Wang Yu, Zhou Fuel System Department Nanjing Engineering Institute of Aircraft Systems AVIC Nanjing China The Aviation Electromechanical System Integration of Aviation Science and Technology Key Laboratory Nanjing China

ISBN: (纸本)9781839535635

In the design of OBIGGS, the determination of the specific concentration of Nitrogen Enriched Air flow is very important. In this paper, the mathematical model of fuel tank inerting is established, and its correctness is verified by the test data. Then, the NEA flow is calculated under a specific flight envelope, and the influence of flight altitude and inerting time on NEA flow is analyzed. The results show that the inerting time should be greater than 10min in the design of OBIGGS. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Flight envelopes

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Research on stator structure optimization design of the RVDT

Research on stator structure optimization design of the RVDT

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CSAA/IET International Conference on Aircraft utility systems (AUS 2020)

作者： H. Xu Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

Featuring high sensitivity, good linearity and compact structure, rotary variable differential transformer (RVDT) is widely used in automatic control systems in aerospace such as the aircraft nose-wheel steering system, the rudder control system and the inlet control system. In the RVDT design process, both the uniformity of the internal magnetic field and the rationality of structural process shall be addressed to optimize the structural parameters on the precondition of meeting performance requirements. This paper selects a typical RVDT structure as the research subject, and identifies that the selection of the slot width of the stator core is key to improve process rationality and manufacturing efficiency. A structure optimization scheme is put forward by simulation based on different structural parameters and verified by tests. This optimized structure greatly improves the manufacturing efficiency, and the research findings can be applied to the development of redundant RVDT, which provides strong support for accelerating R&D of such products

关键词： stators design engineering differential transformers aerospace control power system control aerospace industry

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Study on Rotor Eddy Current Losses in High-speed Permanent Magnet Motor for Aircraft Applications

Study on Rotor Eddy Current Losses in High-speed Permanent M...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Yaohua Hu Shushu Zhu Yibo Ge Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems Nanjing China Center for More-electric-aircraft Power System Nanjing University of Aeronautics and Astronautics Nanjing China

The rotor eddy current loss of 30 kW/60000 r/min high speed permanent magnet motor for aviation applications is studied in this paper. According to the basic electromagnetic characteristics of the motor, the no-load air gap flux density and flux distribution, the output torque under rated load, the eddy current of the rotor with different stator slot openings and different permanent magnet sheath materials under rated load are studied. The results show that the smaller the stator slot opening is, the smaller the eddy current loss is, but the larger the stator core loss is. The smaller the permeability of the permanent magnet sheath material is, the smaller the eddy current loss of the rotor is. Carbon fiber or titanium alloy is recommended for high speed permanent magnet motors.

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Study on rotor eddy current loss of double-winding permanent magnet fault-tolerant motor for electro-hydrostatic actuator applications

Study on rotor eddy current loss of double-winding permanent...

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CSAA/IET International Conference on Aircraft utility systems 2020, AUS 2020

作者： Zhao, Qing Hu, Yaohua Zhang, Pengfei Yang, Le AVIC Aerospace System CO. LTD No.5 Yard Shuguang Xili Beijing China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems No 33 Shuige Road Nanjing China

ISBN: (纸本)9781839535635

Rotor eddy current losses of a double-winding high-speed permanent magnet fault-tolerant motor for electro-hydrostatic actuator (EHA) applications are studied in this paper. Firstly, the rotor eddy current losses of dual-winding high-speed permanent magnet fault-tolerant motors with different winding modes are studied. Then, the rotor eddy current losses of different magnetic retaining sleeve materials such as stainless steel, titanium alloy and carbon fiber are calculated accurately. The problem of slot opening and slot segmentation in high speed permanent magnet motor with concentrated winding is analysed. Finally, a double-winding high-speed permanent magnet fault-tolerant motor prototype was fabricated to verify the analysis results. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Permanent magnets

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Clocking Effect of Relative Position Matching on the Hydrodynamic and Flow-Induced Noise Characteristics in a Centrifugal Pump

SSRN

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SSRN 2024年

作者： Wei, Zhicong Zhu, Zuchao Li, Xiaojun Tao, Ran Xiao, Ruofu Hu, Honglin Key Laboratory of Fluid Transmission Technology of Zhejiang Province Zhejiang Sci-Tech University 928 4th St Zhejiang Hangzhou310018 China College of Water Resources and Civil Engineering China Agricultural University 17 Tsinghua East Road Beijing100083 China Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System 17 Tsinghua East Road Beijing100083 China Nanjing Engineering Institute of Aircraft Systems Jincheng 33 Shui Ge Road Jiangsu Nanjing211106 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration 33 Shui Ge Road Jiangsu Nanjing211106 China

This paper investigates the influence of clocking effect caused by the relative position matching(RPM) between the rotating and stationary blades in a single-stage centrifugal pump. The hydrodynamic performance and flowinduced noise characteristics under different PRM between the rotating and stationary blades are numerically studied and validated by experiments. The results indicates that the clocking effect caused by RPM can improve pump hydrodynamic performance and noise characteristics. A non-dimensional parameter describing the clocking effect caused by RPM is proposed, which absolute value shows a significant negative correlation with the pump head and sound pressure. The variation of hydrodynamic performance and noise characteristics among the different Ce are compared, suggesting that the Ce is not the only factor and is also affected by the blade tilt angle. The analysis of the flow field indicates that the clocking effect primarily enhances noise reduction by improving the transmission characteristics of pressure fluctuation, and then improves the unsteady surface pressure distribution on the wall of the volute. The above results demonstrate that it is able to achieve the effect of increasing the head and reducing the noise by adjusting the RPM. © 2024, The Authors. All rights reserved.

关键词： Noise abatement

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Design and performance analysis of an airborne miniature vapor compression refrigerator for extreme temperature environments

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Applied Thermal Engineering 2025年 274卷

作者： Mou, Xinzhu Li, Yexiang Zhong, Hao Xu, Sheng Zhang, Jingyang College of Astronautics Nanjing University of Aeronautics and Astronautics Nanjing210016 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing211102 China Beijing Aerospace Technology Research Institute Beijing100074 China

High-performance aircraft encounter dynamic temperature fluctuations during missions, necessitating reliable thermal management systems. This study presents a miniature vapor compression refrigeration (MVCR) system designed for high-performance aircraft, which are subjected to extreme temperature variations during missions. The MVCR system is crucial for maintaining the reliability of onboard precision components, such as infrared detectors and high-power electronics, under harsh conditions. Addressing the limitations of existing systems, such as large size and low performance, this paper introduces a compact, lightweight MVCR system with dimensions of 350 mm × 200 mm × 100 mm and a weight of 2 kg. It delivers a cooling capacity of over 150 W and a coefficient of performance (COP) of 1.76, ensuring effective temperature control in extreme environments (-20 to 70 °C). The study investigates the effects of compressor speed, thermal load, and ambient temperature on the system's performance, analysing both steady and transient cooling processes. The reliability and temperature control capabilities of MVCR system are evaluated across a wide temperature range, with a focus on elevated and extreme conditions. Control strategies are developed to optimize temperature regulation under varying environmental temperatures, and their effectiveness is validated through experiments. The results confirm the system's ability to maintain equipment temperatures within operational limits under diverse thermal loads and ambient conditions. This study offers pivotal insights into ensuring the reliable operation of temperature-sensitive equipment within complex thermal environments, specifically catering to the needs of aerospace and refrigeration industries. © 2025

关键词： Vapor compression refrigeration

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