检索结果-内蒙古大学图书馆

16th IEEE PES Asia-Pacific Power and Energy Engineering Conference, APPEEC 2024

作者： Wang, Haoyu He, Hongwen Wang, Pei Geng, Yiteng Guo, Xuncheng National Engineering Laboratory for Electric Vehicles Beijing China National Key Laboratory of Advanced Vehicle Integration and Control Beijing Institute of Technology Beijing China

ISBN: (纸本)9798350386127

Lithium-ion batteries (LIBs) are important energy storage components for new energy vehicles. Accurately estimating the State of Health (SOH) of LIBs ensures the safe and reliable operation of the power battery. Addressing the challenges of poor data quality, intricate sampling information, and incomplete battery cycles in real-world vehicle data, this paper proposes a pioneering SOH estimation method based on Light Gradient Boost Machine (LGBM) ensemble learning during charging process. A data preprocessing and operating condition reconstruction method is designed to streamline battery operating conditions and enhance overall data quality. The charging segments are extracted, and an aging features extraction method suitable for real-world vehicle data is proposed as well as high-value health indicators are selected using correlation analysis. The Bayesian optimization algorithm is employed to efficiently search for the optimal hyperparameters of the model, and comparisons and validations with other modeling algorithms and optimization methods and the estimation results on different vehicles are also carried out. The results show that LGBM method with Bayesian optimization algorithm achieves an overall superior estimation performance with the mean absolute percentage error limited within 2.71 % and exceptional computational efficiency. © 2024 IEEE.

关键词： State of charge

来源：评论

学校读者我要写书评

暂无评论

Thermal dynamic simulation study of the aircraft ECS laboratory air source

Thermal dynamic simulation study of the aircraft ECS laborat...

引用

2024 International Symposium on Intelligent Manufacturing and Automation, ISIMA 2024

作者： Dai, Zheng Cui, Yi Shanghai Aircraft Design and Research Institute Commercial Aircraft Corporation of China Ltd. No. 5188 Jinke Road Shanghai China State Key Laboratory of Airliner Integration Technology and Flight Simulation China

The Environmental control System's working conditions are complex, and the regulation and control are challenging. Moreover, the bleed air system has characteristics such as large thermal inertia, high nonlinearity, and strong coupling between air supply systems, making it difficult to design and verify its dynamic characteristics. This study aims to evaluate the structure of the air source facility in the aircraft ECS laboratory to meet the dynamic performance requirements of engine bleed air. Through the coordinated operation of various components, the proposed air source configuration can adjust the output air temperature T1 and pressure P1 within a certain range. A dynamic Matlab-based model was established, and typical component parameters were assumed for preliminary studies. The results show that the proposed air source facility configuration performs well in controlling temperature T1 and pressure P1. The P1 control performance is close to ideal, and the T1 control is also close to ideal when the heater heats the air stream temperature T5 to 1, 500oF. Additionally, the control interactions between T1 and P1 are small, indicating good controllability. © Published under licence by IOP Publishing Ltd.

关键词： Research laboratories

来源：评论

学校读者我要写书评

暂无评论

RESEARCH ON AIRWORTHINESS VERIFICATION technology FOR CARGO COMPARTMENT FIRE EXTINGUISHING AGENT DISTRIBUTION SYSTEM UNDER SECURITY CLAUSES

RESEARCH ON AIRWORTHINESS VERIFICATION TECHNOLOGY FOR CARGO ...

引用

2024 CSAA/IET International Conference on aircraft Utility Systems, AUS 2024

作者： Li, Xiaoyue Gu, Junming Guo, Zhihui Shanghai Aircraft Design and Research Institute Shanghai201210 China State Key Laboratory of Airliner Integration Technology and Flight Simulation Shanghai200126 China

In response to the enhanced security design requirements proposed by the Federal Aviation Administration (FAA) in FAR 25-127 amendment, this paper explores the airworthiness compliance strategies for the fire protection system of large transport aircraft against clause 795(b)(3). The research focuses on the impact resistance performance of the cargo compartment fire extinguishing agent distribution subsystem. Through systems engineering and scenario analysis methods, an innovative verification strategy is proposed to ensure the effectiveness of the fire extinguishing system under extreme conditions such as explosions. Additionally, the paper discusses how to maximize safety while minimizing the impact on aircraft operational efficiency in the design process. Through this comprehensive study, the paper aims to provide practical guidance and recommendations for aircraft designers and airworthiness certification agencies, aiming to enhance aircraft safety performance and ensure the safety of passengers and crew. © The Institution of Engineering & technology 2024.

关键词： Fire extinguishers

来源：评论

学校读者我要写书评

暂无评论

Experimental research on blowing-rain intensity and uniformity of rain tunnel for aircraft rain removal testing 2

Experimental research on blowing-rain intensity and uniformi...

引用

2023 2nd International Conference on Aerospace and control Engineering, ICoACE 2023

作者： Liu, Qianqian Zhao, Yi Liu, Caixia Shanghai Aircraft Design & Research Institute Shanghai201210 China State Key Laboratory of Airliner Integration Technology and Flight Simulation Shanghai201210 China

The objective of the present study is to characterize a rain tunnel that is used for performance testing of aircraft windshield rain removal systems. The rain tunnel in the present study is an open jet wind tunnel with six full cone pressure swirl nozzles arranged at its outlet. Experiments are conducted with water at room temperature as the working medium. The influence of total water supply flow rate and air velocity on the blowing-rain intensity and uniformity is studied. The total water supply flow rate varies from 0.57 m3/h to 1.03 m3/h, while the pressure at the inlet of the nozzle ranges from 1.44 bar to 6.52 bar. The air velocity of 30 m/s, 40 m/s, and 50 m/s is studied. A special test setup has been designed for measurements of the blowing-rain intensity and uniformity. Experimental results indicate that the blowing-rain intensity and uniformity both increase with the increasing total water supply flow rate and decrease with the increasing air velocity. © Published under licence by IOP Publishing Ltd.

关键词： Water supply

来源：评论

学校读者我要写书评

暂无评论

Research on Component Level PHM technology for Electromechanical Systems Based on Machine Learning 5

Research on Component Level PHM Technology for Electromechan...

引用

5th IEEE International Conference on Civil Aviation Safety and Information technology, ICCASIT 2023

作者： Zhai, Junyi Li, Zhengqiang Chen, Bin Shanghai Aircraft Design and Research Institute State Key Laboratory of Airline Integration Technology and Flight-Simulation Shanghai China

ISBN: (纸本)9798350310603

Prognostics and Health Management (PHM) technology is a maintenance support method that utilizes condition-based maintenance. It encompasses fault diagnosis, fault prediction, and health management, ultimately leading to reduced equipment support costs. Currently, data-driven PHM technology is a popular research area, with a focus on the application of machine learning methods. This article utilizes machine learning techniques to study fault diagnosis and residual service life prediction. Specifically, it investigates machine learning-based fault diagnosis methods by analyzing and implementing a BP neural network model for fault diagnosis of hydraulic actuators. Additionally, it compares the differences between standard Gradient descent and Adaptive learning rate Gradient descent. The article also explores the SVM method and its parameter optimization, proposing a fault diagnosis method based on the GA-SVM algorithm and demonstrating its effectiveness. The primary focus is on developing a similarity-based framework for residual service life prediction. This involves elaborating on three similarity measure functions and proposing a health factor construction method based on PCA and BP neural network for multi-source statistical data. © 2023 IEEE.

关键词： Failure analysis

来源：评论

学校读者我要写书评

暂无评论

Research on airworthiness verification technology of minimum weight MOC8 test of civil aircraft

Research on airworthiness verification technology of minimum...

引用

2024 CSAA/IET International Conference on aircraft Utility Systems, AUS 2024

作者： Wu, Shengliang Shanghai Aircraft Design and Research Institute Shanghai201210 China State Key Laboratory' of Airliner Integration Technology and Flight Simulation Shanghai201210 China

The inclusion of modification items and test equipment on the test aircraft renders it unattainable to achieve the minimum weight as defined by design during the flight test. Consequently, it is imperative to conduct minimum weight MOC8 test on the engineering simulator. This paper presents a comprehensive analysis of the airworthiness clause pertaining to minimum weight, devises a scenario for verifying MOC8 compliance with minimum weight requirements, and proposes a methodology for conducting MOC8 conformity verification based on minimum weight. The research findings have been successfully applied in practical engineering. © The Institution of Engineering & technology 2024.

关键词： Flight testing

来源：评论

学校读者我要写书评

暂无评论

NUMERICAL SIMULATION AND EXPERIMENTAL RESEARCH ON TAYLOR COUETTE FLOW CHARACTERISTICS IN AIR GAP OF AVIATION MOTOR

NUMERICAL SIMULATION AND EXPERIMENTAL RESEARCH ON TAYLOR COU...

引用

2024 CSAA/IET International Conference on aircraft Utility Systems, AUS 2024

作者： Ma, Hui Liang, Shuyue Zhan, Hongbo Qi, Lin Chen, Weijian Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration No.33 Shuige Road Nanjing China Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Areonautics and Astronautics No.29 Yudao Street Nanjing China

A test bench with PIV technology was built and visualization research on Taylor vortex between concentric rotating cylinders was carried out to explore the flow morphology within the annular gap by changing the rotational speed of the inner cylinder. The numerical method and accuracy were verified by experiments. The selected turbulence model was then applied for numerical simulation of the Taylor Couette flow in a simplified air gap model of an aviation motor with smooth inner and outer walls. The Taylor Couette flow characteristics in the air gap under varying rotational speed were studied, and simulation results were given for flow with axial flow and without axial flow. © The Institution of Engineering & technology 2024.

关键词： Axial flow

来源：评论

学校读者我要写书评

暂无评论

A Multi-UCAV cooperative occupation method based on weapon engagement zones for beyond-visual-range air combat

引用

Defence technology（防务技术） 2022年第6期18卷 1006-1022页

作者： Wei-hua Li Jing-ping Shi Yun-yan Wu Yue-ping Wang Yong-xi Lyu School of Automation Northwestern Polytechnical UniversityXi'an710129China Shaanxi Province Key Laboratory of Flight Control and Simulation Technology Xi'an710129China Science and Technology on Aircraft Control Laboratory FACRIXi'an710065China

Recent advances in on-board radar and missile capabilities,combined with individual payload limitations,have led to increased interest in the use of unmanned combat aerial vehicles(UCAVs)for cooperative occupation during beyond-visual-range(BVR)air ***,prior research on occupational decision-making in BVR air combat has mostly been limited to one-on-one *** such,this study presents a practical cooperative occupation decision-making methodology for use with multiple *** weapon engagement zone(WEZ)and combat geometry were first used to develop an advantage function for situational assessment of one-on-one *** encircling advantage function was then designed to represent the cooperation of UCAVs,thereby establishing a cooperative occupation *** corresponding objective function was derived from the one-on-one engagement advantage function and the encircling advantage *** resulting model exhibited similarities to a mixed-integer nonlinear programming(MINLP)*** such,an improved discrete particle swarm optimization(DPSO)algorithm was used to identify a *** occupation process was then converted into a formation switching task as part of the cooperative occupation model.A series of simulations were conducted to verify occupational solutions in varying situations,including two-on-two *** results showed these solutions varied with initial conditions and weighting *** occupation process,based on formation switching,effectively demonstrates the viability of the proposed *** cooperative occupation results could provide a theoretical framework for subsequent research in cooperative BVR air combat.

关键词： Unmanned combat aerial vehicle Cooperative occupation Beyond-visual-range air combat Weapon engagement zone Discrete particle swarm optimization Formation switching

来源：评论

学校读者我要写书评

暂无评论

GROUND SMOKING TEST STUDY ON ENGINE INTAKE PERFORMANCE EFFECTED BY FUSELAGE UNDER CROSS WIND CONDITION

GROUND SMOKING TEST STUDY ON ENGINE INTAKE PERFORMANCE EFFEC...

引用

2024 CSAA/IET International Conference on aircraft Utility Systems, AUS 2024

作者： Zhu, Jianjun Jin, Jiangchen He, Bihai Yan, Yan Zhong, Weixing Liu, Hao Jiang, Jintao Yang, Fei Zhao, Qiang COMAC Shanghai Aircraft Design and Research Institute Shanghai201210 China State Key Laboratory of Airliner Integration Technology and Flight Simulation Shanghai200126 China

Under crosswind conditions, the left and right engines exhaust gas temperatures (EGT) may be inconsistent under MTO thrust level of a certain type of civil aircraft. A ground test utilize flow field visualization technique is taken to study the flow field near the engine inlet under crosswind conditions to study the reason of such phenomenon. By analyzing the test results, it is found that air flow pass around the fuselage could lead to the airflow separation at some position of the engine inlet as well as the pre-swirl flow upstream the engine inlet, which could lead to the change of working environment for the engine inlet, and may cause the EGT inconsistent. © The Institution of Engineering & technology 2024.

关键词： Exhaust systems (engine)

来源：评论

学校读者我要写书评

暂无评论

MODELING METHOD FOR SIMULATING ELECTRICAL LOAD SYSTEM OF CIVIL aircraft BASED ON CPU-FPGA

MODELING METHOD FOR SIMULATING ELECTRICAL LOAD SYSTEM OF CIV...

引用

2024 CSAA/IET International Conference on aircraft Utility Systems, AUS 2024

作者： Yang, Yan Wang, Hongxin COMAC Shanghai Aircraft Design & Research Institute Shanghai200126 China State Key Laboratory of Airliner Integration Technology and Flight Simulation Shanghai200126 China

Considering the severe environment and load conditions that the aircraft may be in different flight phases, for different power supply modes of the aircraft, it is necessary to conduct electrical load and power capacity analysis on full-aircraft to confirm that the power supply capacity of power system meets the power demand of utility system and can support the design work of power supply system. Due to the difficulty in achieving smaller step simulation calculations based on CPU real-time simulators for power system and electrical load system simulation modeling, it is necessary to use hybrid step simulation based on FPGA (Field Programmable Gate Array) and CPU(Central Processing Unit). The full-aircraft contains various power sources as well as a large amount of loads, and the resource consumption of FPGA has become a limiting factor for simulation scale. A modeling method suitable for CPU-FPGA joint simulation is proposed to address this problem, and a joint simulation platform for electric load systems is built. The load system is divided into CPU part and FPGA part, and the optimized load classification modeling is used in FPGA part to reduce the occupancy of hardware resources. Finally, the simulation results based on Matlab/ Simulink proves that the method can guarantee the simulation accuracy. © The Institution of Engineering & technology 2024.

关键词： aircraft power systems

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：