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Early fire detection technology based on improved transformers in aircraft cargo compartments

Journal of Safety Science and Resilience 2024年第2期5卷 194-203页

作者： Hongzhou Ai Dong Han Xinzhi Wang Quanyi Liu Yue Wang Mengyue Li Pei Zhu College of Civil aviation Safety Engineering Civil Aviation Flight University of ChinaGuanghan618307China CivilAircraf Fire Science and Safety Enginring key laboratory of Sichuan CivilAviation Flight University of ChinaGuanghan 618307China School of Computer Engineering and Science Shanghai UniversityShanghai 200444China key laboratory of Civil aviation Emergency Science&Technology Nanjing University of Aeronautics and AstronauticsNanjing 210000China

The implementation of early and accurate detection of aircraft cargo compartment fire is of great significance to ensure flight safety.The current airborne fire detection technology mostly relies on single-parameter smoke detection using infrared light.This often results in a high false alarm rate in complex air transportation envi-ronments.The traditional deep learning model struggles to effectively address the issue of long-term dependency in multivariate fire information.This paper proposes a multi-technology collaborative fire detection method based on an improved transformers model.Dual-wavelength optical sensors,flue gas analyzers,and other equipment are used to carry out multi-technology collaborative detection methods and characterize various feature dimensions of fire to improve detection accuracy.The improved Transformer model which integrates the self-attention mechanism and position encoding mechanism is applied to the problem of long-time series modeling of fire information from a global perspective,which effectively solves the problem of gradient disappearance and gradient explosion in traditional RNN(recurrent neural network)and CNN(convolutional neural network).Two different multi-head self-attention mechanisms are used to classify and model multivariate fire information,respectively,which solves the problem of confusing time series modeling and classification modeling in dealing with multivariate classification tasks by a single attention mechanism.Finally,the output results of the two models are fused through the gate mechanism.The research results show that,compared with the traditional single-feature detection technology,the multi-technology collaborative fire detection method can better capture fire information.Compared with the traditional deep learning model,the multivariate fire pre-diction model constructed by the improved Transformer can better detect fires,and the accuracy rate is 0.995.

关键词： Deep learning Aircraft cargo compartment Attentionmechanism Firedetection Multi-sourcedata fusion

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Recent advances in constructing new type of epoxy resin flame retardant system using ammonium polyphosphate

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Journal of Safety Science and Resilience 2024年第2期5卷 179-193页

作者： Penglun Zheng Haihan Zhao Junwei Li Quanyi Liu Hongzhou Ai Rui Yang Weiyi Xing College of Civil aviation Safety Enginering Civil aviation Flght University of China Guanghan 618307China Civil Aircraft Fire Science and Safety Engineering key laboratory of Sichuan Province Guanghan 618307China Department of Engineering Physics Tsinghua UniversityBejing 100084China State key laboratory of Fire Science University of Science and Technology of ChinaHefei 230026AnhuiChina

In recent years,research has focused heavily on the investigation of functionalized ammonium polyphosphate(APP)flame retardants to improve the fire safety of epoxy resins(EP).The reason for this is the dual nature of APP's performance in fire protection of EP.This article provides a comprehensive overview of the advances in the use of functionalized APP flame retardants to improve the fire resistance of EP materials.It then presents the improvement of the modification of the functionalized APP flame retardants in terms of the hydrophobicity,compatibility and catalytic ability of the flame retardants,as well as the effects on the fire resistance,heat resistance,smoke reduction and mechanical properties of the EP composites.After the summary and comparison of the relevant studies,it is clear that the functionalized APP flame retardants can effectively improve the fire safety of EP composites and offset the adverse effects of APP in EP flame retardant applications.In addition,APP flame retardants can obtain various excellent functions through the use of materials with different properties,and the interaction between APP and materials can also lead to more efficient fire protection.However,the current problem is to find ways to streamline the process and minimise the costs associated with functionalized APP flame retardants,as well as to use them effectively in industrial production.We hope that this review can provide valuable hints and insights for the practical application of functionalized APP in EP and perspectives for future research.

关键词： Flame retardancy Epoxy resin Ammonium polyphosphate Mechanical properties Hydrophobicity

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Aerial-ground collaborative routing with time constraints

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Chinese Journal of Aeronautics 2023年第2期36卷 270-283页

作者： Jiahao XING Lichen SU Wenjing HONG Lu TONG Renli LYU Wenbo DU School of Electronics and Information Engineering Beihang UniversityBeijing 100091China School of Future Aerospace Technology/Shen Yuan Honors College Beihang UniversityBejing 100091China School of Automation Science and Electrical Engineering Beihang UniversityBejing 100091China Guangdong Provincial key laboratory of Brain-Inspired Intelligent Computation Shenzhen 518055China Department of Computer Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Research Institute of Frontier Science Beihang UniversityBeijing 100083China caac key laboratory of general aviation operation Civil Aviation Management Institute of ChinaBeijing 100102China

The advancement of autonomous technology makes electric-powered drones an excellent choice for flexible logistics services at the last mile delivery stage.To reach a balance between green transportation and competitive edge,the collaborative routing of drones in the air and trucks on the ground is increasingly invested in the next generation of delivery,where it is particularly reasonable to consider customer time windows and time-dependent travel times as two typical time-related factors in daily services.In this paper,we propose the Vehicle Routing Problem with Drones under Time constraints(VRPD-T)and focus on the time constraints involved in realistic scenarios during the delivery.A mixed-integer linear programming model has been developed to minimize the total delivery completion time.Furthermore,to overcome the limitations of standard solvers in handling large-scale complex issues,a space-time hybrid heuristic-based algorithm has been developed to effectively identify a high-quality solution.The numerical results produced from randomly generated instances demonstrate the effectiveness of the proposed algorithm.

关键词： Aerial-ground collaborative delivery Mixed-integer programming Space-time hybrid heuristic algorithm Vehicle routing problem with drones Time-dependent travel times

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IEEE standard pioneered an IT-led interdisciplinary approach to structure low-altitude airspace for UAV operations

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Science China(Information Sciences) 2022年第10期65卷 295-296页

作者： Chenchen XU Xiaohan LIAO Fei YANG State key laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences The Research Center for UAV Applications and Regulation Chinese Academy of Sciences Office of Air Traffic Regulation Civil Aviation Administration of China (CAAC)

Unmanned aerial vehicles(UAVs) equiped with state-of-theart information and automation technologies are developing rapidly, especially in low-altitude airspace within 1000 m above ground. Many commercialized UAV flights may soon jam this slice of airspace. Thus, the IEEE Communications Society has established a working group to develop a standard for structuring a low-altitude airspace framework for UAV operation.

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A survey of safety separation management and collision avoidance approaches of civil UAS operating in integration national airspace system

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Chinese Journal of Aeronautics 2020年第11期33卷 2851-2863页

作者： Xiangmin GUAN Renli LYU Hongxia SHI Jun CHEN Department of general aviation Civil Aviation Management Institute of ChinaBeijing 100102China general aviation Institute of Zhejiang JianDe Hangzhou 311600China School of Engineering and Materials Science Queen Mary University of LondonLondon E14NSUnited Kingdom

Recent years have witnessed a booming of the industry of civil Unmanned Aircraft System(UAS).As an emerging industry,the UAS industry has been attracting great attention from governments of all countries and the aviation industry.UAS are highly digitalized,informationized,and intelligent;therefore,their integration into the national airspace system has become an important trend in the development of civil aviation.However,the complexity of UAS operation poses great challenges to the traditional aviation regulatory system and technical means.How to prevent collisions between UASs and between UAS and manned aircraft to achieve safe and efficient operation in the integrated operating airspace has become a common challenge for industry and academia around the world.In recent years,the international community has carried out a great amount of work and experiments in the air traffic management of UAS and some of the key technologies.This paper attempts to make a review of the UAS separation management and key technologies in collision avoidance in the integrated airspace,mainly focusing on the current situation of UAS Traffic Management(UTM),safety separation standards,detection system,collision risk prediction,collision avoidance,safety risk assessment,etc.,as well as an analysis of the bottlenecks that the current researches encountered and their development trends,so as to provide some insights and references for further research in this regard.Finally,this paper makes a further summary of some of the research highlights and challenges.

关键词： Air transportation Collision avoidance Safety Separation control Unmanned aircraft system

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Design and Experimental Evaluation of PID Controller for Digital Electro-Pneumatic Cabin Pressure Control System

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Transactions of Nanjing University of Aeronautics and Astronautics 2016年第5期33卷 576-583页

作者： Nie Jinfang Pan Quan Shen Hao Song Zhitao Zhang Dalin College of Automation Northwestern Polytechnical University Xi'an 710072 P.R. China Shanghai Aircraft Airworthiness Certification Center of caac Shanghai 200335 P.R. China aviation key laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing University of Aeronautics and Astronautics Nanjing 210016 P.R. China

The performance of the designed digital electro-pneumatic cabin pressure control system for the cabin pressure schedule of transport aircraft is investigated.For the purpose of this study,an experimental setup consisting of a simulated hermetic cabin and altitude simulation chamber is configured for cabin pressure control system operation.A series of experimental tests are executed to evaluate the performance of the cabin pressure control system.The parameters of the PID controller are optimized.In the optimization process,the variation regularity of the rate of cabin pressure change under various conditions is considered.An approach to prioritize the control of the rate of change of cabin pressure based on the flight status model is proposed and verified experimentally.The experimental results indicate that the proposed approach can be adopted for the designed digital electro-pneumatic cabin pressure control system to obtain a better cabin pressure schedule and rate of cabin pressure change.

关键词： cabin pressure control digital electro-pneumatic PID controller

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Verification Platform for Formation Method Based on Quad-rotor UAV

Verification Platform for Formation Method Based on Quad-rot...

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第32届中国控制与决策会议

作者： Xiangmin GUAN Renli LV Ruiyou Li Miao Wang Huaxian Liu caac key laboratory of general aviation operation Department of General AviationCivil Aviation Management Institute of China general aviation Institute of Zhejiang JianDe

Cooperative work based on multi-UAV is the development trend in the UAV field.The work efficiency and the completion rate of tasks can be greatly improved through collaborative work of multiple UAVs.In this paper,a verification platform for UAV formation method is established,which consists of three quad-rotor UAVs and a ground control system working as a monitoring and command center.An open source UAV flight control system named Pixhawk is adopted by the quad-rotor UAVs,and the minicomputer named Raspberry Pi 3 is used to simulate the On-board computer running the formation algorithm and executing the tasks.This paper verified the feasibility and effectiveness of the UAV formation algorithm based on artificial potential field method through the verification platform established by itself.

关键词： UAV formation verification platform artificial potential field method

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Research on conflict resolution method for multi aircrafts based on mixed integer programming

Research on conflict resolution method for multi aircrafts b...

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第32届中国控制与决策会议

作者： Xiangmin GUAN Renli LV Ruiyou Li Qing Zhang caac key laboratory of general aviation operation Department of General AviationCivil Aviation Management Institute of China general aviation Institute of Zhejiang JianDe

In order to ensure flight safety,aviation industry has put forward various methods.Reasonable flight conflict resolution method is the key technology to ensure the safe flight of aircrafts.However,the traditional conflict resolution method based on linear programming only allows the aircraft to change speed or angle,which reduces the flexibility of aircraft and is difficult to meet the need of eliminating conflicts to the greatest extent.Firstly,aiming at minimizing the cost of conflict resolution,this paper constructs a mathematical model based on integer programming,which can optimize the speed,heading angle and altitude of an aircraft at the same time,and uses CPLEX software to solve the problem.Experiments in classical scenarios show that the proposed method can effectively solve the conflict resolution problem among a larger scale of aircrafts.

关键词： linear programming conflict resolution large scale optimize at the same time

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Conflict resolution problems solved with linear programming in air traffic management systems

Conflict resolution problems solved with linear programming ...

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第32届中国控制与决策会议

作者： Xiangmin GUAN Renli LV Huaxian Liu caac key laboratory of general aviation operation Department of General AviationCivil Aviation Management Institute of China general aviation Institute of Zhejiang JianDe School of Electronic and Information Engineering Beihang University

In the framework of free flight,there can be no intersection between the protected areas of two planes.The traditional conflict resolution methods allow generally the aircraft to change the speed alone or to change angle alone.Starting from the method of linear programming and based on solving some special problems,this article presents a method that can change the speed and angle of aircraft in the same time.Finally,some tests verify the feasibility of the method.

关键词： linear programming air traffic conflict resolution free flight

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Evaluation of the WDM6 scheme in the simulation of number concentrations and drop size distributions of warm-rain hydrometeors: comparisons with the observations and other schemes

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Atmospheric and Oceanic Science Letters 2019年第6期12卷 458-466页

作者： GUO Jiaxu LEI Hengchi CHEN Di YANG Jiefan key laboratory of Cloud-Physics and Severe Storms Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijingChina Collaborative Innovation Center on the Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and TechnologyNanjingChina aviation Meteorological Center Air Traffic Management BureauCAACBeijingChina

暖云粒子数浓度及粒子谱对微物理过程的模拟有着重要影响,不同于许多微物理方案,WDM6方案显示预报云滴数浓度。为评估其模拟效果,本文对比了WDM6方案与Thompson方案、Morrison方案在一次飞机观测试验中的模拟结果。结果表明:相比于观测... 详细信息

暖云粒子数浓度及粒子谱对微物理过程的模拟有着重要影响,不同于许多微物理方案,WDM6方案显示预报云滴数浓度。为评估其模拟效果,本文对比了WDM6方案与Thompson方案、Morrison方案在一次飞机观测试验中的模拟结果。结果表明:相比于观测结果,WDM6方案模拟云(雨)滴数浓度偏小(大),云滴谱较宽,特别是对于层状云中上部的模拟偏差较大。尽管Thompson方案和Morrison方案将云滴数浓度设置为常数,但这两种方案的云滴数浓度及云滴谱却更接近于观测。对于WDM6方案初始云凝结核数目(CCN0)的敏感性试验表明,改变CCN0能够改进WDM6方案对于对流云的模拟,但对于层状云的模拟结果影响较小。

关键词： WDM6 scheme暖云粒子数浓度粒子谱飞机观测 WDM6方案

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