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CSAA/IET International Conference on Aircraft Utility Systems (AUS 2024)

作者： Qinyang Li Ning Guan Bo Ning Guangya Zhu Dalin Zhang Weijian Chen Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics and Astronautics Nanjing People's Republic of China College of Aeronautics Shandong Jiaotong University No.5001 Haitang Road Changqing University Science and Technology Park Jinan People's Republic of China Utility System Design and Research Department Jiangxi Hongdu Aviation Industry Group Company Ltd. Nanchang People's Republic of China

ISBN: (数字)9781837242108

The supercooled water droplets in the air will form a water film on the aircraft during flight, which will then form icing, which will have an impact on the aerodynamic performance of the aircraft and even endanger the flight safety. In this paper, based on the Eulerian Wall Films model, the partial wetting effect is introduced, and the water film flow on flat plates driven by airflow shear force is investigated. The flow behaviours of water film with different contact angles under different flow rates were explored through water film test. The effectiveness of the calculation method for water film flow characteristics in this paper was verified by comparison between numerical simulation and test records, which laid a foundation for the anti-icing calculation in subsequent studies.

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Research on measurement method of six degree of freedom for head based on safetr of aircraft pilot seat

Research on measurement method of six degree of freedom for ...

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CSAA/IET International Conference on Aircraft Utility Systems (AUS 2020)

作者： G. Luo Z. Jin W. Xie R. Wang Aviation Key Laboratory of Science and Technology on Life-support Technology Xiangyang Hubei China AVIC Aerospace Life-support Industries Ltd. China

In order to ensure the safety of the pilot's life, the six degree of freedom data of the ATD head need to be obtained through dynamic impact test to evaluate the possibility of head injury in the cockpit. A binocular photogrammetry method by the simplified solution of normal equation based on bundle adjustment was proposed. On the basis of satisfying the imaging requirements of high-speed cameras, the 3D position and posture data of the head were obtained by shooting and analyzing the images of the test process.

关键词： vehicle dynamics photogrammetry seats biomechanics impact testing injuries air safety stereo image processing pose estimation aircraft testing aerospace engineering dynamic testing

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Equivalent study on delethalization test for sled head injury criteria test of civil aircraft passenger seat

Equivalent study on delethalization test for sled head injur...

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CSAA/IET International Conference on Aircraft Utility Systems (AUS 2020)

作者： Z. Jin W. Shen G. Luo M. Li Z. Jia W. Zhou L. Jia L. Zhang Aviation Key Laboratory of Science and Technology on Life-support Technology Xiang yang China Test Department AVIC Aerospace Life-Support Industries LTD No.29 Xinhua road Xiang yang China

The equivalent study between delethalization test and sled HIC test is in order to improve the efficiency of Head Injury Criteria (HIC) test on civil aircraft passenger seats, as well as to reduce the test consumption and cost. The equivalent impact model was established based on the equal rotatory kinetic energy, then the test of equal energy impact was designed and the delethalization test was carried out. The results of delethalization test and sled HIC test show that all the deviation value of HIC, peak head center of gravity (CG) acceleration in X direction, peak head CG resultant acceleration and the deformation of the seat back (C/B) was within ± 20%. In conclusion, the equivalent impact model in this paper is suitable, and the delethalization test be used as an equivalent method for sled HIC test is feasible.

关键词： aircraft seats biomechanics vibrations vehicle dynamics impact (mechanical) safety devices injuries elasticity impact testing

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Simulation study on dynamic opening characteristics of airplane drag chute under the condition of stable crosswind

Simulation study on dynamic opening characteristics of airpl...

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CSAA/IET International Conference on Aircraft Utility Systems (AUS 2020)

作者： L. Jin P. Yang X. Hu H. Li L. Zhang D. Cui Aviation Key Laboratory of Science and Technology on Life-support Technology Xianyang China AVIC The First Aircraft Institute Institute of mechanical and electrical system Xi’an China

In this paper, the ALE fluid-solid coupling algorithm is used to realize the simulation of the dynamic opening process of a certain type of airplane drag parachute. Based on the drag parachute working principle and folding process, a finite element model of the main parachute in the installed state is established. In the LS-DYNA software, the parachute opening characteristics of the drag parachute were simulated and analyzed under no crosswind conditions and Stable crosswind conditions at speed 10m/s. The results show that, under the condition of no crosswind, the error of the important parameters such as parachute straightening force, parachute opening dynamic load, parachute deflection angle and test data is less than 15%, and the simulation accuracy meets the engineering development requirements. On this basis, the parameters such as the unfolding shape, deflection angle, and stress state of the parachute parachute under stable crosswind conditions, which are difficult to test and simulate, were studied. This will provide a theoretical basis and technical approach for drag chute design and other types of parachute product research.

关键词： finite element analysis parachutes aerospace simulation aerospace testing drag design engineering

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Reliability Analysis of Certain Rocket Engine Based on Fault Tree 4

Reliability Analysis of Certain Rocket Engine Based on Fault...

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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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Reliability Analysis of Certain Rocket Engine Based on Fault Tree

Reliability Analysis of Certain Rocket Engine Based on Fault...

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

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Numerical investigation of influence of structure and operating parameters on performance of vortex oil filter

Numerical investigation of influence of structure and operat...

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CSAA/IET International Conference on Aircraft Utility Systems, AUS 2018

作者： Wang, Ning Chen, Weijian Ning, Guoli Hui, Ma Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics and Astronautics Nanjing China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

ISBN: (纸本)9781785617911

In this paper, the three-dimensional numerical simulation of solid-liquid two-phase flow in a vortex oil filter is performed by means of numerical simulation. The Reynolds stress turbulence model is used in the simulation flow field, and the DPM model is used for solid particle tracking. The influence of key structural parameters and operating parameters on the filtering effect was mainly studied, such as the inlet width, the size of the overflow pipe, the wall thickness and the insertion depth, the size of the cone angle and the length of the cone end. The results provide the basis for the rational design of the vortex oil filter. © 2018 IET Conference Publications. All rights reserved.

关键词： Vortex flow

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Preparation of biodegradable PLA/PCL composite filaments: effect of PLA content on strength

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IOP Conference Series: Materials Science and Engineering 2020年第1期770卷

作者： H M Qiu K W Hou J P Zhou W J Liu J B Wen Q F Gu School of Material Science and Engineering Nanchang Hangkong University Nanchang 330063 China Aviation Key Laboratory of Science and Technology on Life-Support Technology Xiangyang 441000 China

As one of the predominant 3D additive manufacturing technology, fused deposition modeling (FDM) suffers from the rich printable filaments. The goal of this paper is to produce a fully biodegradable polymeric composite filament by blending polylactic acid (PLA) with polycaprolactone (PCL). The effect of PCL content on the geometry, size, roughness and ultimate tensile stress of PLA/PCL composite filaments was investigated, and mechanical properties of the printed components were tested. The results indicate that, with the increase of PCL content, the diameter and ultimate tensile stress gradually decreased, while the surface roughness gradually increased. Due to the toughing effect, with an increase in PCL content, the tensile strength of parts decreased, while the elongation at break and the impact strength kept rising. It was found the parts printed with the addition of 20% of PCL composite filament exhibits the optimal comprehensive performance.

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Simultaneously static and dynamic layout designs of stiffening structures

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IOP Conference Series: Materials Science and Engineering 2020年第1期892卷

作者： Zhijie Feng Kai Wu Xuan Liang Jianbin Du AVIC Aerospace Life-Support Industries LTD Aviation Key Laboratory of Science and Technology on Life-Support Technology Xiangyang 441000 P.R. China School of Aerospace Engineering Tsinghua University Beijing 100084 P.R. China

In the present paper, the topological design problem of lightweight stiffening structures are studied. Multiple design criteria like static compliance, dynamic compliance, eigenfrequency/eigenfrequency gaps and weight are considered simultaneously as sub-objectives in the optimization model. A bound formulation is developed and implemented to deal with the problem concerned, by which the difficulties of non-continuity of the multiple objective functions can be got over. Comparing with the empirical adjustment design or more elaborated parametric design, the topological design may introduce more degrees of design freedom, and thus is possible to produce more innovative conceptual design. The method of sequential convex programming is employed to find the solution of the optimization problem. Numerical examples show that, using the presented approach, the optimized layout of the stiffening structures with enhanced static and dynamic mechanical properties can be obtained.

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Research on Reliability Assessment Method of Emergency Escape Parachute

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Journal of Physics: Conference Series 2020年第1期1544卷

作者： Fangyun Ma Huajin Lei Wensheng Wang Jing Liu Liying Jin Aviation Key Laboratory Science and Technology on Life-Support Technology Hubei Xiangyang 441003 China Aerospace Life-Support Industries Ltd. Hubei Xiangyang 441003 China School of Mechanical Engineering Hubei University of Arts and Science Xiangyang 441053 China

Aiming at the problem that emergency escape parachute cannot meet the requirements of the index using the binomial evaluation method, combined with the characteristics of emergency escape parachute products, comprehensively using emergency escape parachute components and system test data, the emergency escape parachute Bayesian reliability assessment method is proposed to solve the problem of reliability assessment in the case of small sample size of emergency escape parachute system test, which effectively reducing emergency escape parachute test expenses and development cycle.

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