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

作者： Wu, Liang Jin, Lou Xu, Hang 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 Ejection Lifesaving Technology R&D Department AVIC Aerospace Life-support Industries Ltd. Xianyang441000 China

Aircraft windshield fragmentation during seat ejection can adversely affect crew ejection from the aircraft safety. In this paper, the shock wave loads caused by the firing of an ejection seat rocket motor were simulated numerically, and the numerical simulation flow was designed with the dynamic grid technique. The results show that the pressure peak of the inner surface monitoring point at the front end of the windshield is 9.4% lower compared with the test value at the same location when the rocket engine is firing at 0 km/h velocity ejection, which proves the numerical simulation method feasible. The effects of rocket pack ignition shock waves on the aircraft windshield can be divided into shock wave loading phase and quasistatic pressure loading phase. The former has a large peak load and a short duration, while the latter has a small peak load and a long *** corners within the cockpit, converging phenomena occur during shock wave propagation, and the area near the cabin inner wall at the front and sides of the aircraft's windshield is more heavily loaded and has a higher risk of damage than other areas. The moment of maximum windshield loading for each calculated state is the moment of the first load peak. Due to the high velocity airflow blowing effect, the maximum windshield loading at 1100 km/h ejects is close to the zero velocity ejection value, acting in the opposite direction. The zero velocity ejection and impact loads at 1100 km/h eject should be emphasized in the windshield strength analysis. © The Institution of Engineering & technology 2024.

关键词： Ejection seats

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Measuring Center of Gravity of Pilot Helmet Based on Binocular Vision 4

Measuring Center of Gravity of Pilot Helmet Based on Binocul...

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4th International Conference on Advances in Computer technology, Information science and Communications, CTISC 2022

作者： Jun, Li Xie, Wujun Wan, Chuanqi Jia, Zixiao Yang, Junwei Avic Aerospace Life-Support Industries LTD. Aviation Key Laboratory of Science and Technology on Life-Support Technology Xiangyang China

ISBN: (数字)9781665458726

ISBN: (纸本)9781665458726

A variety of functions are integrated into the pilot helmet, making it an intelligent weapon platform for pilots to improve situational awareness and target attacks capabilities. However, the mass distribution of the helmet has also been changed, which has a negative impact on the pilot's health and safety. Accurate measurement of the Center of Gravity (CG) of pilot helmet is of great significance for the ergonomic design. Benefiting from the rapid development of 3D computer vision technology, a 3D coordinate of CG measurement scheme for pilot helmet based on binocular vision is proposed by adopting suspension method. The measuring equipment and program are introduced in detail, and the calculation model for the center of gravity is also established. The calibration results show that the proposed measurement scheme based on binocular vision is effective. © 2022 IEEE.

关键词： Binocular vision

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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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Study on Simulation Method to Determine the Inflation Threshold of Head Protective Airbag for High-speed Helicopter Pilot 2

Study on Simulation Method to Determine the Inflation Thresh...

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2022 2nd International Conference on Mechanical, Aerospace, and Automotive Engineering, CMAAE 2022

作者： Feng, Zhijie Fan, Chengcheng Ke, Chuanyi Zhang, Haibo Liu, Tao AVIC Aerospace Life-Support Industries LTD. Xiangyang441000 China Aviation Key Laboratory of Science and Technology on Life-Support Technology Xiangyang441000 China School of Aerospace Engineering Tsinghua University Beijing100084 China

Compared with ordinary helicopters, the flying speed of high-speed helicopters is increased from 350km / h to 450km / h, and the crash speed is bound to exceed 12.8m / s, which greatly increases the probability of collision injury of the pilots' head. The equipment, such as the traditional safety belts and crashworthy seats, cannot play an effective role in protection. In order to effectively improve the crashworthy survival rate of high-speed helicopter pilots, the main method in European and American countries is to design additional head protective airbags. The paper carried out the study on the simulation method for determining the high-speed helicopter head protection airbag inflation threshold value. Based on LS-DYNA, it has established the impact simulation model of the high-speed helicopter cockpit - seat - safety belt - pilot system. At the same time, the HIC value of the dummy head (no more than 1000N) and the pull force of the shoulder strap (no more than 8890N) are taken as the objective function to simulate the collision process of the man/seat system in multiple states of the high-speed helicopter. Finally, the inflation threshold of the head protective airbag is determined, which provides a critical support for the development of the head protective airbag. © Published under licence by IOP Publishing Ltd.

关键词： Helicopters

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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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Research on High Precision Measurement of Head Position and Posture

Research on High Precision Measurement of Head Position and ...

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2022 CSAA/IET International Conference on Aircraft Utility Systems, AUS 2022

作者： Luo, Guoxiong Liu, Xiang Gao, Hongyi Jin, Zhisheng Xie, Wujun Cui, Wenming Aviation Key Laboratory of Science and Technology on Life-support Technology Hubei Xiangyang China AVIC Aerospace Life-support Industries Ltd. Hubei Xiangyang China

ISBN: (数字)9781839537769

ISBN: (纸本)9781839537769

For the safety of pilots, it is necessary to explore the change process of ATD head spatial position and posture in the dynamic impact test of driver's seat. Therefore, a comprehensive position and posture solution method was proposed, which mainly including bundle adjustment method, forward intersection method and feature line projection method. This method achieves the high precision of the ATD head position and posture measurement requirements, and its measurement accuracy reaches the level of mm and degree respectively. © 2022 IET Conference Proceedings. All rights reserved.

关键词： attitude measurement biomechanics CCD image sensors computer vision impact testing position control position measurement vehicle dynamics

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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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Perforated plate ventilation system and dynamics of infectious respiratory particle transmission

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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

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A hybrid piecewise FDD strategy for refrigeration charge fault of airborne vapor-compression cycle system

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INTERNATIONAL JOURNAL OF REFRIGERATION 2022年 135卷 164-173页

作者： Sun, Chengbin Wang, Hexu Jiang, Yanlong Gao, Zanjun Wang, Ju [a]Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics and Astronautics 29 Yudao St. Nanjing 210016 China [b]Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing 211106 China

Many researchers have carried out study on refrigerant charge fault for variable refrigerant flow (VRF) airconditioning system, while few pay attention to refrigerant charge fault for vapor-compression refrigerant cycle system (VCS) of enhanced vapor injection (EVI) with a flash tank onboard. To develop a strategy for refrigerant charge fault of the above system, the optimization methods have been implemented to predict the refrigerant charge level (RCL) based on virtual refrigerant charge (VRC) models. Firstly, Pearson correlation coefficient analysis is employed to obtain the characteristic parameters. Secondly, a piecewise modified VRC model with the different characteristic parameters from VRC models is obtained for two cases of RCL < 75% and RCL > 75%. Meanwhile, combined with the principal component analysis (PCA) and the support vector machine (SVM) algorithm, a PCA-SVM model is developed to improve the prediction accuracy, and the average root mean squared error (RMSE) is only 7.8 compared to 14.9 of the modified VRC model when RCL > 75%, meanwhile, the correctly detected ratio is improved from 62.8% to 84.5%. Then, for solving the difficulty of fault detection and diagnosis (FDD) when RCL > 160%, the moving time window average (MA) algorithm is introduced and an online PCA-MA-SVM model is developed. Finally, a hybrid piecewise FDD strategy combined with three models for refrigeration charge fault in airborne VCS of EVI with a flash tank is obtained.

关键词： Vapor-compression refrigeration cycle system Enhanced vapor injection Refrigerant charge fault support vector machine Moving time window average

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