Investigation on Real Environment Simulation Method and Ground Test Technology of Lunar Landing and Ascending

2021 ◽  
pp. 452-458
Author(s):  
Zhang Zhang ◽  
Mingzhang Tang ◽  
Zhihui Lv ◽  
Miao Zhao ◽  
Yu Liu
Keyword(s):  
Simulation Method ◽  
Lunar Landing ◽  
Real Environment ◽  
Test Technology ◽  
Environment Simulation ◽  
Ground Test

Ground Simulation Method for Envelope Performance of Airship in near Space

2014 ◽  
Vol 989-994 ◽  
pp. 3473-3476
Author(s):  
Long Bin Liu ◽  
Pan Pan Mi ◽  
Shuai Cao ◽  
Ming Yun Lv
Keyword(s):  
Mechanical Test ◽  
High Strength ◽  
Simulation Method ◽  
Test Methods ◽  
Simulation Test ◽  
Near Space ◽  
Envelope Material ◽  
Environmental Test ◽  
Ground Test ◽  
Weather Resistance

Performing characteristics on envelope composite of near space airship (NSA) are quite different from that of the low altitude airship essentially. The NSA envelope material should meet excellent applicative characteristics including light weight, high strength, anti-aging, anti-ultraviolet radiation, gas-tightness, weather resistance. Ground simulation test is critical for the envelope design and development process of NSA, and the environmental features of near space is analyzed for NSA, then corresponding ground simulation test methods are proposed to involve mechanical strength of the ground test methods among the changing weather temperature and over pressure changes, materials weather resistance and air tightness test. Finally the coupling relationship between various mechanical test and environmental test methods is also investigated.

Ground test technology of rendezvous and docking

2014 ◽  
Vol 44 (1) ◽  
pp. 27-33 ◽  
Author(s):  
XiaoGang MOU ◽  
Lei SHI ◽  
YueXin GUAN ◽  
JingHai WANG ◽  
Ning TANG
Keyword(s):  
Test Technology ◽  
Ground Test ◽  
Rendezvous And Docking

scholarly journals Research on Sand-dust Separation Technology Based on Gas-solid Two-phase Numerical Simulation

2020 ◽  
Vol 145 ◽  
pp. 02068
Author(s):  
Lei Zhang ◽  
Junwei Wang ◽  
Guohua Li
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Separation Efficiency ◽  
Simulation Method ◽  
Test System ◽  
Two Phase ◽  
Separation Technology ◽  
Electromechanical Products ◽  
Environment Simulation ◽  
Sand Dust

The separation technology in the large-scale sand-dust environment ground simulation test system applicable to the environmental adaptability and reliability verification of aerospace electromechanical products is studied. The gas-solid two-phase numerical simulation method is adopted, and the possible cyclone separation, inertial separation methods are used to study the separation efficiency and regularity technology, which provides a basis for the separation design and test of the sand-dust environment simulation of large electromechanical products.

Modeling and Simulation of Aircraft Nose Landing Gear Emergency Lowering Using Co-Simulation Method

2012 ◽  
Vol 215-216 ◽  
pp. 1213-1218 ◽  
Author(s):  
Xiao Hui Wei ◽  
Yin Yin ◽  
Heng Chen ◽  
Hong Nie
Keyword(s):  
Hydraulic System ◽  
Simulation Analysis ◽  
Impact Load ◽  
Simulation Method ◽  
Critical Value ◽  
Landing Gear ◽  
Peak Oil ◽  
Dynamical Models ◽  
Damping Force ◽  
Ground Test

This paper builds dynamical models and hydraulic system models of retraction/lowering of some regional aircraft nose landing gear respectively based on the software LMS VL motion and AMESim. The simulation analysis result was proved to be credible by checking with that of ground test. The peak oil return pressure with the critical damping force can be obtained by analyzing the hydraulic damping characteristic of actuator cylinder during landing gear emergency lowering based on methods of estimation and co-simulation. The results indicate that the damping characteristic of actuator cylinder plays an important role in emergency lowering. Only when the damping force breaks through the critical value, can the landing gear succeed in emergency lowering and being locked. However, the little damping force will result in great impact load while lowering. Thus, damping force should be changed only when emergency lowering.

scholarly journals Study on the Simulation Method of the Ground Test in the Arc-Heated Wind Tunnel

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Wanqing Luo ◽  
Yuanjian Yang ◽  
Jianhan Liang ◽  
Songhe Zhang ◽  
Yilei Shi
Keyword(s):  
Heat Flux ◽  
Wind Tunnel ◽  
Oxygen Atom ◽  
Stagnation Point ◽  
Mass Fraction ◽  
Simulation Method ◽  
Test Conditions ◽  
Ground Test ◽  
The Difference ◽  
Stagnation Point Heat Flux

To analyze the effectiveness of the thermal assessment test, the simulation method of the ground test in the arc-heated wind tunnel is studied. Based on the solution of the thermochemical nonequilibrium Navier-Stokes equations, the flowfield around the spherical cylinder is simulated in the flight and ground test conditions, and the difference in the high enthalpy flowfield between the flight and ground test conditions is investigated. The flight parameters and ground test conditions are selected according to the criterion that the total enthalpy and the stagnation point heat flux of the fully catalytic cold wall (calibrated heat flux) are similar. The flowfield for different temperature boundaries and different catalytic walls is solved under the same free stream conditions, and the stagnation point heat flux and oxygen atom mass fraction are compared and analyzed. It is found that the heat flux on the fully catalytic wall for the radiation balance temperature boundary in the ground test is lower than that in the corresponding flight condition, but the difference is not obvious on the noncatalytic wall. In addition, the oxygen atom mass fraction after the shock wave in the ground test is higher than that in the corresponding flight condition. To make the stagnation point heat flux and oxygen atom mass fraction after the shock wave similar to those of the flight, the simulation method of the arc-heated wind tunnel test needs to be adjusted.

scholarly journals Study on Ground-Test Simulation Method of the Ram Air for Commercial Airliners’ Environmental Control System

2015 ◽  
Vol 121 ◽  
pp. 325-332 ◽  
Author(s):  
Zhe Ma ◽  
Xingjuan Zhang ◽  
Chao Wang ◽  
Han Yang ◽  
Chunxin Yang
Keyword(s):  
Control System ◽  
Environmental Control ◽  
Simulation Method ◽  
Ground Test
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