检索结果-内蒙古大学图书馆

4th International Conference on Mechanical Design and Simulation, MDS 2024

作者： Zhang, Yao State Key Laboratory of Airliner Integration Technology and Flight Simulation Shanghai Aircraft Design and Research Institute No.5188 Jinke Road Pudong New Area Shanghai201210 China

ISBN: (纸本)9789819778867

Metal materials are widely used in aviation, aerospace, and other fields. At present, a large part of the materials for military and civilian equipment are metal materials. The mechanical properties of metal materials can be tested to understood as the characteristics of materials more comprehensively. One of the common forms of damage to metallic materials is impact damage from low-velocity impacts. Evaluation of the impact properties of materials using a drop hammer impact tester can objectively reflect the reliability of the permissible values of the impact properties of metallic materials, which is of great significance for the design of future aircraft structures. This paper takes the mechanical properties of aluminum–lithium alloy test piece impact test as an example, according to the source of uncertainty in the test results, analyses the reasons for the introduction of uncertainty components and mathematical model, through the calculation of the synthetic uncertainty of each component to finally obtain the extended uncertainty of the impact performance test of the material, which provides a basis for the study of the performance of the aircraft materials and structural design. © The Author(s) 2025.

关键词： Lithium alloys

来源：评论

学校读者我要写书评

暂无评论

Perforated plate ventilation system and dynamics of infectious respiratory particle transmission

引用

International Journal of Mechanical System Dynamics 2024年第4期4卷 497-514页

作者： Caiyue Song Mengmeng Cheng Benben Kong Zhuo Zeng Nenglin Yuan Hong Shi College of Energy&Power Engineering Jiangsu University of Science and TechnologyZhenjiangChina Key Laboratory of Aircraft Environment Control and Life Support MIITNanjing University of Aeronautics&AstronauticsNanjingChina

With the removal of indoor pollutants and the assurance of air quality emerging as critical research topics,the optimization of the internal environment in offices,where people stay for extended periods,is essential for controlling the spread of infectious respiratory *** movements of personnel and the operation of doors and windows within offices significantly impact the mechanisms of droplet transmission,warranting further *** study employs computational fluid dynamics simulations to explore the droplet dispersion characteristics and pollutant removal efficiency of the simplified model of perforated plate ventilation system(PPVS)(the diameter of the air supply openings has been reasonably simplified and uniformly set to 0.02 m)in office settings,as well as the impact of dynamic door operation scenarios on droplet spread and concentrations in breathing *** optimize the ventilation system's pollutant removal efficiency,airflow velocities(2.86,3.18,and 5.00m/s)are varied,with simulations conducted at the optimal velocity of 3.18 m/*** effects of continuous door operations,door-opening directions(towards the office and towards the isolation room),and opening speeds(π/4,π/6,π/8,andπ/10 rad/s)are also examined,revealing significant impacts on droplet *** indicate that PPVS effectively reduces indoor pollutant concentrations at all tested airflow velocities,with the optimal speed identified as 3.18 m/***,door-opening direction and speed can significantly influence droplet *** doors towards isolation rooms at smaller angles(less than 30°)effectively reduces droplet concentrations in personnel breathing zones,thereby mitigating the risk of droplet *** door-opening speeds also contribute to lower droplet concentrations in these *** innovative study explores the impacts of PPVS and dynamic door operation dynamics on droplet transmission during respiratory disease outbreaks,providing

关键词： dynamic simulation indoor pollutant infectious respiratory particles perforated plate ventilation system

来源：评论

学校读者我要写书评

暂无评论

Functional simulation of the cabin pressure control system based on stateflow 3

Functional simulation of the cabin pressure control system b...

引用

2024 3rd International Conference on Aerospace and control Engineering, ICoACE 2024

作者： Wang, Yehao Meng, Fanxin Yang, Yonghui Wang, Shun Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Jiangsu Nanjing211106 China AVIC Nanjing Engineering Institute of Aircraft Systems Jiangsu Nanjing211106 China

The cabin pressure control system(CPCS) is an important part of the aircraft environmental control system. In the actual flight process, it needs to achieve different functions according to the working scene. In this paper, the architecture and working principle of the CPCS system are summarized, and the functions of the system are analyzed;the control logic of each function is designed and simulated by the Stateflow platform. The results show that the control logic and its transition constraints designed in this paper can meet the functional requirements of the system, and the dynamic response is rapid, which can be used for the cabin pressure control system of civil aircraft system function design and verification to provide a reference. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： aircraft control

来源：评论

学校读者我要写书评

暂无评论

INVESTIGATION OF THE FLOW BOILING CHARACTERISTIC IN MINI CHANNEL WITH VARIOUS MICRO PIN FIN

INVESTIGATION OF THE FLOW BOILING CHARACTERISTIC IN MINI CHA...

引用

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

作者： Liu, Shirui Ding, Xiaoya Jiang, Renjie Chen, Weijian Zhang, Dalin Zhu, Guangya Li, Yanjun Key Laboratory of Aircraft Environment Control and Life Support Ministry of Industry and Information Technology Nanjing University of Aeronautics and Astronautics Nanjing China

Flow boiling in mini-channel is a pivotal technique for airborne vapor compression cycles. This study conducts experimental tests to examine the flow boiling characteristics in mini-channel having four distinct pin fin configurations: diamond, square, circle, and sinusoidal. All channels maintain a uniform hydraulic diameter of 0.67 mm, with only a 2.3% variation in total heat transfer area. The experiments cover a range of operating conditions, including mass fluxes of 150 - 300 kg/(m2-s) and heat fluxes of 10 - 25 kW/m2. The results reveal that the pin fin shapes have a significant impact on the pressure drop during flow boiling in mini-channel. Notably, the diamond fins exhibit the least flow resistance. In conditions of identical operation, the pressure drop in channels with square, circular, and sinusoidal fins increases by 303.6%, 120.0%, and 71.6% in meanly, respectively, compared to that of the diamond fins. However, the impact of fins on heat transfer property is less pronounced. Upon analyzing both the pressure drop and heat transfer property, the diamond fins emerge as the superior choice in terms of overall property. The insights gained from this research can inform future optimization efforts for airborne evaporator design. © The Institution of Engineering & technology 2024.

关键词： Drops

来源：评论

学校读者我要写书评

暂无评论

Modeling and validation of key components of thermal management systems

Modeling and validation of key components of thermal managem...

引用

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

作者： Zekun, Mei Shuai, Xu Fanxin, Meng Guangya, Zhu Dalin, Zhang Weijian, Chen Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics and Astronautics Nanjing China 805th Research Institute of China Aerospace Science and Technology Corporation Shanghai China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration No.33 Shuige Road Nanjing China

ISBN: (数字)9781837242108

In this paper, two key components of thermal management system are modeled by the underlying logic operation of SIMULINK. Simulink-PS signal conversion module is used to connect the electric grid and the calculation part of the heat grid to build the fuel tank heat grid model. The temperature transient simulation model of phase-change heat exchanger was established by using the integral module in Simulink library. Experimental verification and literature data verification are provided for these two components. The results show that the error between simulation results and experimental data is between 0.1% and 3%, which proves the accuracy and feasibility of the system modeling in this paper. It lays a foundation for the simulation of the overall thermal management scheme. © The Institution of Engineering & technology 2024.

关键词： Fuel tanks

来源：评论

学校读者我要写书评

暂无评论

ARCHITECTURE DESIGN AND VERIFICATION OF INERT GAS DISTRIBUTION SYSTEM

ARCHITECTURE DESIGN AND VERIFICATION OF INERT GAS DISTRIBUTI...

引用

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

作者： Wang, Yangyang Wang, Chenchen 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

This study addresses the requirements for tank inerting and proposes application-oriented architectures for inert gas distribution system. Utilizing AMEsim, a multi-tank simulation model is constructed. The accuracy of the model was validated through experimental data,demonstrating its applicability for engineering calculations. Furthermore,the model was utilized to analyze both series and parallel schemes of the distribution system. Results suggest that the series scheme effectively reduces tank oxygen concentration, enhances system reliability and oxygen concentration uniformity, and achieves higher inert gas utilization rates with simplified pipeline arrangements. Consequently, we recommend adopting the series scheme for inert gas distribution system. These findings provide a basis for designing and optimizing inerting system. © The Institution of Engineering & technology 2024.

关键词： Tanks (containers)

来源：评论

学校读者我要写书评

暂无评论

INJECTION PERFORMANCE OF MICRO-INJECTOR HOT-AIR ANTI-ICING SYSTEM

INJECTION PERFORMANCE OF MICRO-INJECTOR HOT-AIR ANTI-ICING S...

引用

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

作者： Haifeng, Tang Jiayi, Li Dalin, Zhang Key Laboratory of Aircraft Environment Control and Life Support Ministry of Industry and Information Technology Nanjing University of Aeronautics & Astronautics Nanjing China

To optimize the micro-injector hot-air anti-icing system, this study designed a model of the micro-injector chamber with five configurations, varying key structural parameters. Numerical simulations using ANSYS Fluent assessed the influence of these parameters on system performance. The variables adjusted included: (1) the gap between the jet hole and the mixing chamber, set between 2mm to 4mm;(2) the height of the corrugated plate channel's outlet, ranging from 4mm to 6mm, with inlet heights between 6mm and 8mm;(3) the mixing chamber length, modified from 42mm to 48mm. Results indicate that increasing mixing chamber length and the jet hole-mixing chamber distance improved injector performance and heat flux density due to better fluid mixing. Smaller inlet height increased injection ratio, however, concurrent reduction in both inlet and outlet heights decreases the injection ratio. Experimental validation was performed using a novel wing anti-icing heat load simulation device on a model configured with an inlet height of 6mm, outlet height of 4mm, a 4mm gap from the jet hole to the mixing chamber, and a 42mm mixing chamber. The experimental outcomes closely aligned with the simulation data, validating the efficacy and accuracy of the simulations in designing micro-injector hot air anti-icing systems. © The Institution of Engineering & technology 2024.

关键词： Hot air heating

来源：评论

学校读者我要写书评

暂无评论

aircraft Heat Exchanger Fault Detection Model Based on Extended Kalman Filter 4

Aircraft Heat Exchanger Fault Detection Model Based on Exten...

引用

4th International Conference on Electrical Engineering and control Science, IC2ECS 2024

作者： Liu, Xinxin Chen, Bing Zhang, Yifeng Cui, Xizhen Comac Shanghai Aircraft Design & Research Institute State Key Laboratory of Airliner Integration Technology and Flight Simulation Shanghai China Nanjing University of Aeronautics and Astronautics Nanjing China

ISBN: (纸本)9798331510107

Heat exchangers are crucial components of aircraft air management systems, primarily responsible for cooling high-temperature engine bleed air and providing air at the appropriate temperature for downstream gas systems. Failures in heat exchangers can reduce heat transfer efficiency, affect the performance of air management systems, and in severe cases, even lead to catastrophic accidents for aircraft. This paper proposes a nonlinear dynamic thermodynamic physical model of the heat exchanger, which, based on the Extended Kalman Filter (EKF), can estimate model parameters when the inlet and outlet temperatures and mass flow rates of the heat exchanger are known. Additionally, bench tests of a clean heat exchanger were conducted in the laboratory, and the test data were used to optimize the Extended Kalman Filter. The results show that the optimized model has high sensitivity and robustness, making it suitable for fault detection in aircraft heat exchangers. © 2024 IEEE.

关键词： Extended Kalman filters

来源：评论

学校读者我要写书评

暂无评论

Trade-Off of the Clearance at the control Plunger Section of a Solenoid Valve 6th

Trade-Off of the Clearance at the Control Plunger Section of...

引用

6th China Aeronautical Science and technology Conference, CASTC 2023

作者： Li, Changming Cui, Pengbo Xu, Xiangrong AVIC Jincheng Nanjing Engineering Institute of Aircraft System Nanjing211106 China Aviation Key Laboratory of Science and Technology On Aero Electromechanical System Integration Nanjing211106 China

ISBN: (纸本)9789819988662

Aiming at block failure of a type of solenoid valve, the clearance at the control plunger section was trade-off, and the purpose is to solve the block while not causing over leakage of the whole valve. According to the analysis of the internal leakage channel of the solenoid valve, it is known that there is no leakage in the clearance at the control plunger section under the power-off condition, and the leakage through the clearance is far less than the allowable value when the power is turned on, that is, the clearance can be increased to eliminate the jam. Within the allowable range of leakage, calculated according to the annular gap flow formula, when the eccentricity of the control plunger in the sleeve takes the extreme values 0 and 1, the unilateral maximum allowable values of the clearance are 6.3 μm and 4.6 μm respectively. According to the estimation of the leakage test results, the eccentricity of the control plunger in the sleeve is 0.42, and the unilateral maximum allowable value of the clearance is 5.8 μm. By increasing the clearance of the control plunger section, the block failure of the solenoid valve is eliminated, and no over-leakage occurs. © 2024, Chinese Society of Aeronautics and Astronautics.

关键词： Blockage Clearance Leakage Solenoid valve Trade-off

来源：评论

学校读者我要写书评

暂无评论

NUMERICAL STUDY ON FLAME SPREAD IN CABIN ATMOSPHERE UNDER VARIOUS OVERLOADS

NUMERICAL STUDY ON FLAME SPREAD IN CABIN ATMOSPHERE UNDER VA...

引用

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

作者： Liu, Zhen Li, Yanjun Wang, Siying Li, Haowen Key Laboratory of Aircraft Environment Control and Life Support Ministry of Industry and Information Technology Nanjing University of Aeronautics & Astronautics Nanjing China

The aircraft cabin is special confined space with various overloads during motion, whose effect on fires is not clear yet. To understand the fire behaviours at different overloads in cabin atmosphere, numerical simulation was performed on upward flame spread over thin solids by solving the governing equations of both gas and solid phase. The main parameter is the overloads and Og to 2g was considered. At most overloads, the flame accelerates and grows continuously before extinction while at Og, flame propagates only with imposed flow. The transient flame positions and spread rates was compared against the overloads and mathematical correlations were proposed. To further understand the effect of overloads on fire behaviours, the local flow speed, solid temperature and heat flux were studied in detail. With the increase of the overloads, the induced flow due to buoyancy increased significantly, which enhanced the oxygen transfer to the flame and heat transfer to the solids. As a consequence, both the gaseous reaction and solid pyrolysis was stimulated, which resulted in longer flame and faster spread rate. The results in this paper revealed that fire safety concern is more serious at high overloads and can contribute to the fire protection design in aircrafts. © 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

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：