检索结果-内蒙古大学图书馆

Automation, Control and Robotics Engineering (CACRE), International Conference on

作者： Linhai Zhang Yeming Yao Lilin Xu Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems

ISBN: (数字)9781728198880

ISBN: (纸本)9781728198897

During take-off and landing of airplanes, landing gear control system features have huge influence on airplane safety. In this paper, Labview software, a virtual instrument from National Instruments Corporation is used as a development platform to apply its powerful G language programming ablity and friendly program design interface to develop system application in order to enable control of landing gear extension and retraction and perform landing gear-related ground tests under laboratory conditions.

关键词： Extension and Retraction of Landing Gear Virtual Instrument Labview

来源：评论

学校读者我要写书评

暂无评论

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

SSRN

引用

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

来源：评论

学校读者我要写书评

暂无评论

Research on 18-pulse autotransformer rectifier device for aviation

Research on 18-pulse autotransformer rectifier device for av...

引用

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

作者： W. Chen J. Liu L. Yu AVIC Nanjing Engineering Institute of Aircraft System/Aviation Key Laboratory of Science and Technology on Aero Electromechanical system integration Nanjing China

In this paper, the scheme of DP type asymmetric 18 pulse boost voltage rectifier autotransformer is adopted to replace the uncontrolled rectifier of the original scheme, reducing the harmonic content of the system and improving the power factor of the system. At the same time, the hardware design and Saber simulation analysis of the whole system are carried out to verify the correctness of theoretical analysis and hardware parameter design. Based on the theory and simulation analysis, a prototype of 3.5kW is developed, and the experimental results are analyzed.

关键词： power factor autotransformers transformer windings aircraft power systems rectifying circuits rectifiers

来源：评论

学校读者我要写书评

暂无评论

Electromagnetic performance analysis of external rotor IPM machine for aircraft applications

Electromagnetic performance analysis of external rotor IPM m...

引用

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

作者： Huang, Xiangpeng Hu, Yaohua Zhang, Pengfei Zhang, Yundong Fourth Representative Office of the Navy Navy Military Representative Office in Nanjing No 33 Shuige Raod Nanjing China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems No 33 Shuige Raod Nanjing China

ISBN: (纸本)9781839535635

This paper has proposed an external rotor fractional slot concentrated winding (FSCW) interior permanent magnet (IPM) machine for aircraft traction applications. The electromagnet performance at no-load condition such as air-gap flux density, flux linkage distribution, electromotive force (EMF), and cogging torque are studied. The electromagnet performance at rated-load condition such as average torque, torque ripple, and iron losses are investigated. It can be found that, the advantages of the external rotor IPM machine are high torque density, high power density, and simple structure. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Permanent magnets

来源：评论

学校读者我要写书评

暂无评论

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

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

引用

Chinese Automation Congress (CAC)

作者： Xuwei Huan Dan Niu Qi Li Jun Yang Guoyao Liu Xisong Chen Xi Xiao Key Laboratory of Measurement and Control of CSE Ministry of Education Southeast University Nanjing China Loughborough University Loughborough UK 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)9781665426480

This paper proposes a state observer and controller based on the second-order sliding mode scheme for under-actuated overhead cranes with load hoisting and lowering. The designed state observer can effectively estimate the uncertainty 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.

关键词： Cranes Uncertainty Force Dynamics Observers Robustness Stability analysis

来源：评论

学校读者我要写书评

暂无评论

Fatigue strength analysis of spring tube of deflector jet servo-valve in random vibration environment

Fatigue strength analysis of spring tube of deflector jet se...

引用

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

作者： Z. Zhang J. Yuan S. Ge Nanjing Mechatronic and Hydraulic Engineering Research Centre Aviation Key Laboratory of science and Technology on Aero Electromechanical System Integration Nanjing 210061 China

By introducing the impulsive inertia force, the mathematical model of deflector jet servo-valve affected by acceleration is established in this paper. Based on the mathematical model, through a time domain transformation of the random vibration’s PSD (power spectral density) and the dynamic model of servo-valve, we analyze the stress of the spring tube in frequency domain, thus proposing a method for analyzing the spring tube’s fatigue strength in random vibration environment. By above methods, a certain type of deflector jet servo-valve is studied by calculating the cyclic stress of stress concentration part of the spring tube in 20g rms random vibration with hydraulic pressure, and the failure cycle is more than 10 8 . Experiment under such condition is also carried out, and no abnormal performances of the servo-valve or fracture of spring tubes does occur, which is consistent with the theoretical result.

关键词： servomechanisms jets valves vibrations fatigue mechanical strength acceleration springs (mechanical) pipes stress effects time-frequency analysis

来源：评论

学校读者我要写书评

暂无评论

Investigation the thermodynamic performance of closed Brayton cycle with CO 2 -based binary mixtures for hypersonic vehicle power generation systems under finite cold source

引用

Thermal science and Engineering Progress 2025年 63卷

作者： Lei Lang Yao Fu Fangyan Jiang Kunlin Cheng Cong Wang Chaolei Dang Shanlin Tian Daopeng Fu Zhijie Liu Song Wang Jiang Qin Hongyan Huang Xin Zhang School of Energy Science and Engineering Harbin Institute of Technology Harbin 150001 PR China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing 210000 PR China AECC Sichuan Gas Turbine Establishment Chengdu 610000 PR China Harbin Normal University Harbin 150001 PR China

Closed Brayton cycle (CBC) is a potential airborne power generation (APG) technology for hypersonic vehicles, but finite cold source limits its power output. To achieve power enhancement and weaken the constraint of the critical properties of the working medium on the minimum cycle conditions, this study assessed and compared the thermodynamic performance for nine types of CO 2 -based binary mixture simple recuperated CBC. Results indicate that for enhanced power output, the average specific heat of the binary mixtures should be greater than CO 2 , while their maximum enthalpy should be lower than CO 2 . Moreover, their critical temperature should be above CO 2 and critical pressure should be below CO 2 . There is optimal fuel temperature difference in precooler for electric power of CO 2 -based binary mixture CBCs. The electric power under per unit mass flowrate of fuel for CO 2 -SO 2 is higher than CO 2 at the maximum circulating pressure ( P 2max ) of 15 MPa (159 kJ/kg vs. 130 kJ/kg). Furthermore, the CO 2 -SO 2 exhibits a lower optimal compressor inlet temperature (327 K vs. 352 K), which can simplify compressor manufacture and design. The thermodynamic performance of CO 2 -SO 2 CBC is better with the higher P 2max . In summary, given system performance, component design, and operating conditions, CO 2 -SO 2 appears more suitable for APG systems under finite cold source. This research can provide a new way to improve the power level of hypersonic vehicle APG systems.

关键词： Airborne power generation Closed-Brayton-cycle CO2-based binary mixture Hypersonic vehicle Limited cold source Thermodynamic performance

来源：评论

学校读者我要写书评

暂无评论

Numerical investigation in characteristics of multi-layer thrust gas foil bearing based on fluid-structure coupling field

引用

Chinese Journal of aeronautics 2025年

作者： Hongwei WANG Yuanwei LYU Jingyang ZHANG Qijun ZHAO Chengfeng NA Lijun CHEN College of Astronautics Nanjing University of Aeronautics and Astronautics Nanjing 210016 China College of Aeronautics Nanjing University of Aeronautics and Astronautics Nanjing 210016 China College of Mechatronics Engineering Nanjing Forestry University Nanjing 210037 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Beijing 120016 China

Rotating machinery in the aviation industry is increasingly embracing high speeds and miniaturization, and foil dynamic pressure gas bearing has great application value due to its self-lubrication and self-adaptive deformation characteristics. This study explores the interaction mechanism between micro-scale variable-sectional shearing flow with hyper-rotation speeds and a three-layer elastic foil assembly through bidirectional aero-elastic coupling in a multi-layer thrust gas foil bearing (MTGFB). The bearing capacity of the MTGFB varies non-linearly with the decrease of air film clearance, while the collaborative deformation of the three-layer elastic foil assembly can deal with different load conditions. As the load capacity increases, the enhanced dynamic pressure effect causes the top foil to evolve from a single arch to multiple arches. The hydrodynamic effects in the gas film evolve to form multiple segmented wedges with different pitch ratios, while the peak pressure of the gas film always occurs near the vaults of the top foil. As the rotational speed frequency approaches the natural frequency, the resonance of the gas film and elastic foil assembly system occurs, and a phase delay occurs between the pressure pulsation and the vibration of foils. The load capacity of the MTGFB also depends on the elastic moduli of the elastic foil assembly. Increasing the elastic modulus decreases the deformation amplitude of the top foil, whereas it increases those of the backboard and middle foil, increasing the load capacity.

关键词： thrust gas foil bearing multi-foil superposition two-way fluid-structure coupling adaptive deformation bearing capacity elastic modulus

来源：评论

学校读者我要写书评

暂无评论

Dynamic Transient Power Sharing in Grid-Connected DC Microgrid

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

引用

2020 IEEE Sustainable Power and Energy Conference, iSPEC 2020

作者： Pokharel, Kabindra Sapkota, Sonee Wang, Yufeng Kang, Zhen Huang, Ming Li, Weilin Wu, Donghua Yan, Ming Fan, Kai Wang, Yi 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: (纸本)9781728191645

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. © 2020 IEEE.

关键词： Electric power utilization

来源：评论

学校读者我要写书评

暂无评论

FPGA-Based Double Vectors Model Predictive Torque Control for PMSM Drives Using Maximized Parallel Implement Architecture

FPGA-Based Double Vectors Model Predictive Torque Control fo...

引用

Workshop on Predictive Control of Electrical Drives and Power Electronics (PRECEDE)

作者： Taoming Wang Guangzhao Luo Donghua Wu Yi Wang Chunqiang Liu Zhe Chen School of Automation Northwestern Polytechnical University Xi’an China Key Laboratory of Aviation Science and Technology on Aerospace Power System Shaanxi Aero Electric Co.Ltd Xi’an China

ISBN: (纸本)9781665425582

To reduce the computation time of double vectors model predictive torque control (DV-MPTC), the maximized parallel architecture implemented in field programmable gate array (FPGA) for the surface-mounted permanent magnet synchronous motor (SPMSM) is proposed. Double vectors, which include an active vector and a zero vector, are used during one control period to reduce steady-state current ripples. In conventional implement architecture, predictive controller and speed controller are a cascaded form. By adjusting the execution sequence of one-step compensation module and candidate vector module in the cascaded predictive controller, the maximized parallel architecture is designed. Furthermore, the parallel architecture may have the problem of disordered parameter update sequence due to the different execution steps. To ensure the orderly execution of the maximized parallel architecture, a logic trigger mechanism is designed and applied in the parallel architecture. Experimental results illustrate the effectiveness of the proposed parallel implement architecture.

关键词： Computational modeling Torque control Programmable logic arrays Predictive models Logic gates Power electronics Parallel architectures

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：