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4th International Conference on Manufacturing, Material and Metallurgical Engineering, ICMMME 2019

作者： Wang, Wensheng Jin, Liying Sun, Xi Liu, Jing Aviation Key Laboratory Science and Technology on Life-Support Technology Xiangyang Hubei441003 China School of Mechanical Engineering Xi'an Jiaotong University Shaanxi Xi'an714200 China Aerospace Life-Support Industries Ltd. Xiangyang Hubei441003 China

In this paper, a fault tree model of certain rocket engine is established according to its structure and working principle. Through qualitative analysis and quantitative calculation, the factors affecting the reliability of a certain type of rocket engine are obtained, and the corresponding improvement measures are put forward to improve the reliability and safety of a certain type of rocket engine. © Published under licence by IOP Publishing Ltd.

关键词： Reliability analysis

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Research on the Pressure Comfort of Pilot Helmets 32

Research on the Pressure Comfort of Pilot Helmets

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32nd Congress of the International Council of the Aeronautical sciences, ICAS 2021

作者： Wang, Xiujuan Xu, Jing Wang, Juhao Mi, Jiachen Jiang, Yaming Aerospace Life-support Industries LTD Xiangyang441003 China Aviation Key Laboratory of Science and Technology on Life-support Technology Xiangyang441003 China Tiangong University School of Textile Science and Engineering Tianjin 300387 China Intel Engineering Simulation Technology Co. Ltd. Dalian116023 China

ISBN: (纸本)9783932182914

With the advancement of technology, the functions of pilot helmets are constantly being upgraded. The highly integrated helmets with display, positioning, sensing, night vision and camera are the future development trends. Although the multifunctional and highly integrated design enhances the combat maneuverability, the add-on components will result in local tenderness as the weight gain and center of gravity change, which seriously affects the pilot's wearing comfort, especially in high-speed overload conditions. These factors have become potential factors affecting flight safety. At present, experience-based methods are no longer suitable for new product development. Therefore, it is urgent to establish a simulation model on the pressure comfort of "helmet-head", the finite element method is used for simulation calculation. This paper studies different conditions of the center of gravity, and using the standard head shape, ball shape and real head shape as a control, to analyze the center of gravity, the difference of the head shape, and the influence of overload loading on the pressure distribution. By comparing with the actual flight situation, the simulation results are consistent with the actual situation, which proves that the simulation model has good credibility. © 2021 32nd Congress of the International Council of the Aeronautical sciences, ICAS 2021. All rights reserved.

关键词： Flight simulators

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RESEARCH ON OPTIMIZATION technology FOR CONTROL PARAMETERS OF EJECTION SEAT BASED ON PSO ALGORITHM 32

RESEARCH ON OPTIMIZATION TECHNOLOGY FOR CONTROL PARAMETERS O...

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32nd Congress of the International Council of the Aeronautical sciences, ICAS 2021

作者： Jin, Lou Wu, Ming Yang, Hui Wu, Liang Cui, Dongyue Overall Technology R and D Department AVIC Aerospace Life-support Industries Ltd. Xianyang441000 China Aviation Key Laboratory of Science and Technology on Life-support Technology Xianyang441000 China Institute of Mechanical and Electrical System AVIC The First Aircraft Institute Xi'an710000 China

ISBN: (纸本)9783932182914

This article studies the optimization simulation method of the multi-modal control parameters of a certain type of ejection seat. According to the working mechanism and optimization goals of the seat, based on the particle swarm optimization algorithm, an optimized simulation program is designed. Using an optimization simulation program written by the Matlab/Simulink platform, the preliminary determination, screening and iterative optimization of control parameters were completed. The optimization results show that by optimizing the multi-modal control parameters, the life-saving performance of the seat is increased by 12.5%, which verifies the effectiveness and feasibility of the optimization algorithm, and provides a theoretical basis for future seat development and modification.. © 2021 32nd Congress of the International Council of the Aeronautical sciences, ICAS 2021. All rights reserved.

关键词： Ejection seats

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Simulation Study on the Influence of Rocket Tail Flame of Ejection Seat on the Thermal Flow Field in Engine Room 5th

Simulation Study on the Influence of Rocket Tail Flame of Ej...

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5th China aviation science and technology Conference, 2021

作者： Jin, Lou Wu, Yibin Wu, Liang Cui, Dongyue Yang, Pin Overall Technology R&D Department AVIC Aerospace Life-Support Industries Ltd Xianyang441000 China Aviation Key Laboratory of Science and Technology On Life-Support Technology Xianyang441000 China Institute of Mechanical and Electrical System AVIC The First Aircraft Institute Xi’an710000 China

ISBN: (纸本)9789811674228

This paper proposes a simulation method and technology for the effect of the ejection seat rocket pack tail flame on the heat flow field of the engine room under the multi-seat ejection condition, combines the six-degree-of-freedom motion model of the ejection seat with the CFD numerical simulation method to realize the simulation process of the thermal flow field in the engine room according to the working mechanism of the seat. The motion trajectory and attitude change law of the first ejected seat under different ejection conditions is calculated by a program written in C#, the movement of the human-seat system and the rocket at the boundary in FLUENT is specified with UDF, then the temperature and pressure change law of the second ejected seat, occupant and the surface of the cockpit during a side ejection at different ejection speeds are simulated. The simulation results show that the temperature of different characteristic points in the engine room rises first and then decreases after the rocket package is working, reaching a peak at about 60ms. The temperature at the back of the seat is the highest, and the temperature in the engine room drops faster while the pressure peak is lower when the seat is ejected at a certain speed. The analysis results can provide a theoretical basis for the design and verification of occupant thermal protection equipment. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Computational fluid dynamics

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Simulation Study on the Influence of Engine Room Wake Field on the Perceived Total Pressure of Ejection Seat Pitot 6th

Simulation Study on the Influence of Engine Room Wake Field ...

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6th China Aeronautical science and technology Conference, CASTC 2023

作者： Jin, Lou Cui, Dongyue Wang, Xun Wu, Yibin Overall Technology R&D Department AVIC Aerospace Life-Support Industries Ltd. Xianyang441000 China Aviation Key Laboratory of Science and Technology On Life-Support Technology Xianyang441000 China Institute of Mechanical and Electrical System AVIC The First Aircraft Institute Xi’an710000 China

ISBN: (纸本)9789819988662

An approach to simulate the total pressure of the pitot during ejection is proposed by combining the numerical simulation of seat motion trajectory and dynamic CFD technology in this paper. By establishing the simulation model of cabin, human-seat system and pitot, the seat motion parameters obtained from the simulation of the motion trajectory are used as input to write the UDF, the motion boundary of the human-seat system is specified, and the grid update during the movement of the seat is realized by dynamic grid method, and the influence of the wake field of the cabin on the total pressure of the pitot under different ejection states is analyzed. The simulation results show that due to the influence of the wake field of the cabin, the perceived total pressure of the pitot first increases and then decreases, peaks at about 0.08s after ejection starts, and is greater than the test total pressure in the subsequent 0.01s time range, and the maximum deviation reaches 14.65%. This peak can be reduced by filtering, reducing the deviation to less than 5%. The simulation model and algorithm are calibrated, and the deviation is less than 2%, which meets the engineering requirements, and the simulation results can provide a basis for the optimization of seat aerodynamic layout and program controller data processing strategy. © 2024, Chinese Society of Aeronautics and Astronautics.

关键词： cabin wake field dynamic CFD ejection seat pitot

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Embedding narrative medicine in primary healthcare:Exploration and practice from a medical humanities perspective

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World Journal of Clinical Cases 2025年第22期13卷 6-24页

作者： Ning-Jia Lei Deep K Vaishnani Mohmmad Shaheen Haniah Pisheh Jing Zeng Fu-Rong Ying Qiu-Qin Yang Cong-Ying Wang Jun Ma Jing-Ye Pan Ning-Jian Hou College of Pharmacy Wenzhou Medical UniversityWenzhou 325000Zhejiang ProvinceChina School of International Studies Wenzhou Medical UniversityWenzhou 325035Zhejiang ProvinceChina Department of Medicine Misr University for Science and TechnologyCairo 3237101Al QahirahEgypt School of Clinical Medicine Wenzhou Medical UniversityWenzhou 325035Zhejiang ProvinceChina Department of Clinical Laboratory First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000Zhejiang ProvinceChina School of Medical Technology and Pharmacy Renji College of Wenzhou Medical UniversityWenzhou 325000Zhejiang ProvinceChina Department of Pathology First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000Zhejiang ProvinceChina Key Laboratory of Intelligent Treatment and Life Support for Critical Diseases of Zhejiang Province Wenzhou Key Laboratory of Critical Care and Artificial IntelligenceZhejiang Engineering Research Center for Hospital Emergency and Process DigitizationThe First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000Zhejiang ProvinceChina Department of International Cooperation and Exchange Wencheng Branch of the First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000Zhejiang ProvinceChina

This study examines the integration of narrative medicine(NM)into primary healthcare(PHC)settings,evaluating its role in enhancing medical humanities education within grassroots healthcare *** a comprehensive literature review and case analysis,the research investigates the current state,challenges,and practical barriers to embedding NM into PHC systems,while proposing targeted strategies for *** findings suggest that NM fosters stronger doctor-patient trust,enhances healthcare quality,and promotes humanistic ***,primary hospitals face numerous challenges in advancing medical humanities,including a lack of trust between doctors and patients,tensions arising from the commercialization of healthcare,institutional limitations,unequal distribution of resources,and issues related to physicians'professional competencies and stress *** interrelated obstacles detract from the quality of PHC services and the overall patient *** on successful case studies from primary hospitals,the paper outlines effective strategies for overcoming these *** study provides both theoretical and practical insights for advancing medical humanities in PHC,contributing to improvements in healthcare service quality and supporting the development of high standards in the healthcare ***,the findings aim to promote the broader adoption and ongoing refinement of NM within PHC institutions.

关键词： Narrative medicine Primary healthcare Medical humanities Doctor-patient relationship Healthcare quality

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SIMULATION RESEARCH ON THE PERFORMANCE OF EJECTING INFLATION SYSTEM OF EMERGENCY EVACUATION SLIDE

SIMULATION RESEARCH ON THE PERFORMANCE OF EJECTING INFLATION...

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

作者： Jin, Lou Liu, Qilong Wu, Liang Overall Technology R&D Department AVIC Aerospace Life-support Industries Ltd. Xianyang441000 China Emergencv Rescue Technology R&D Department AVIC Aerospace Life-support Industries Ltd. Xianyang441000 China Aviation Key Laboratory ofScience and Technology on Life-support Technology Xianyang441000 China

In this article, the CFD method is used to analyse the performance of the ejecting inflation system of the emergency evacuation slide. The simulation model is established according to the operating principle of the ejecting inflation system. Quantitative analysis of the applicability and accuracy of simulation models in the performance simulation of the ejecting inflation system is carried out, and the effects of different ejection pressures and ejection working fluid components on the system performance are simulated. The research results show that the Realizable k-e model has the smallest simulation deviation, and the ejection flow rate and ejection ratio are within 5% of the experimental value, which meets the requirements of engineering development;increasing ejection pressure is beneficial to increase the ejection flow rate and speed up the inflation of the slide, but the ejection ratio will decrease when the ejection pressure pass 3.75MPa, which is not conducive to reducing the weight of the system;increasing the N2 content in the ejection gas source is beneficial to increase the ejection ratio and reduce the weight of the system while ensuring the inflation performance. The research results of this article can provide a theoretical basis for the determination of the design index of the ejecting inflation system of the emergency evacuation slide. © The Institution of Engineering & technology 2024.

关键词： Ejectors (pumps)

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Test and simulation of emergency flotation system buoy anti-overturning method 2

Test and simulation of emergency flotation system buoy anti-...

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

作者： Yang, Li Huang, Yanping Sun, Libing He, Fan Zhu, Yuanchun Emergency Rescue Technology R&D Department Hangyu Life-saving Equipment Co. Ltd. Xiangyang441100 China Key Laboratory of Aviation Science and Technology for Aviation Protection and Life-saving Technology Xiangyang441100 China

The helicopter emergency flotation system can provide flotation capability after the helicopter accidentally falls into the water. During a test of a helicopter float in a submerged state, it was found that the vertical distance between the highest point of the contact point of the float and the aircraft and the lowest point of the cabin door was 0.59 m, which seriously hindered the entry and exit of the crew from the cabin door. To reduce the adverse effects of the pontoon flipping up on the occupants entering and exiting the hatch, it is envisaged to use restraint belts, add anti-rollover airbags, and design the anti-rollover airbags into triangles and saddle shapes respectively. Through theoretical analysis, the simulation method eliminated the triangle method for the connecting belt and the anti-rollover airbag and selected the saddle-shaped anti-rollover airbag for floating and immersion tests. The test results met expectations. The highest point of the contact point between the float and the aircraft was the lowest point of the cabin door. The points did not interfere in the vertical direction, and this method was finally chosen to be applied to the buoy to suppress the upturn of the buoy. © Published under licence by IOP Publishing Ltd.

关键词： Flotation

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THE DISPERSION CHARACTERISTICS OF INFECTIOUS DROPLETS IN A CIVIL AIRCRAFT CABIN WITH DIFFERENT AIR SUPPLY RATES

THE DISPERSION CHARACTERISTICS OF INFECTIOUS DROPLETS IN A C...

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

作者： Li, Pei Sun, Jianhong Zheng, Daren Xu, Changyue Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics and Astronautics Nanjing210016 China Key Laboratory of Civil Aviation Emergency Science and Technology CAAC Nanjing University of Aeronautics and Astronautics Nanjing211106 China

This work presents a simulation of infectious droplet dispersion in a civil aircraft cabin with the Euler-Lagrangian method. The influence of different rates of air supply on the airflow field, droplet dispersion, and concentration distribution of infectious droplets are analysed. The results show the rates of air supply have a significant impact on airflow filed. The area of vortex circulation region in the cabin is reduced. Total mass of infectious droplets in the cabin basically reaches stability after the infector exhales the infectious droplets for 120 seconds. The total mass in the civil cabin is 3.56×10-12 kg with the 6.9 L per second per person and respectively decreased by 4.21% and 22.75% with increasing the air supply rate to 10 L per second per person and 16 L per second per person. The concentration of infectious droplets in each passenger's respiratory zone is examined. The infector located at the middle of the cabin or sitting near the aisle could affect more passengers and thus, the infector is recommended to sit by the window during the epidemic. © The Institution of Engineering & technology 2024.

关键词： Vortex flow

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Multi-target Emergency Rescue Path Planning in Marine Wind and Wave Environments 3

Multi-target Emergency Rescue Path Planning in Marine Wind a...

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2022 3rd International Conference on Mechanical Engineering and Materials, ICMEM 2022

作者： Sun, Zhi Yu, Yuanyuan Mei, Yiying Xiao, Xunqiao Shi, Zicang Key Laboratory of Civil Aviation Emergency Science and Technology CAAC Nanjing University of Aeronautics and Astronautics Nanjing211106 China Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics and Astronautics Nanjing210016 China

With the development of marine-related industries, the number of tasks at sea has increased, and accidents there happen more frequently as well. Search and rescue are very challenging because of the extreme wind and wave environment at sea. Therefore, the state has been paying more attention to maritime emergency rescue. One part is emergency rescue path planning, which is crucial for helicopter emergency rescue at sea. In this paper, a series of multi-target rescue path solutions are created in order to solve the challenge of multi-target rescue path planning while taking into account sea wind and waves. The rescued targets' floating trajectory model is first established. Then, a recursive algorithm based on a permutation tree is given in response to the unsteady change of the targets' position at sea. The rescue path is planned with the goal of cutting down on the helicopter's search time. Finally, using the multi-target rescue in China's Taiwan Strait as an example, it is discovered that the overall time needed for the multi-target rescue is decreased by 7.03 minutes, and the efficiency of the rescue is improved by 13.3% in the wind and wave environment at sea. According to the research, the optimal rescue path shortens the time required for multi-target rescue at sea while increasing the effectiveness of helicopter rescue operations. © Published under licence by IOP Publishing Ltd.

关键词： Motion planning

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