Table of Content

26 June 2020, Volume 38 Issue 3

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Civil Aviation

RF terminal design and implementation for self-adaptive ADS-B anti-interference receiver

HU Tieqiao, LIU Liang

2020, 38(3):  1-7. 

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Aiming at the special requirements of self-adaptive ADS-B anti-interference receiver, RF terminal with good channel consistency is designed involving design scheme, key component design and performance testing. Test results show that the current RF terminal has higher gain, lower noise ratio and better channel consistency,meeting the special requirements of self-adaptive ADS-B anti-interference receiver, and supplying reference for the independent research and development of which.

Multi-runway airport hot spot recognition method based on Monte Carlo simulation

MENG Linghang, TIAN Chuan

2020, 38(3):  8-11. 

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The runway and taxiway systems of large airports are becoming more and more complex. For the newly built airport, it is difficult to find the hot spots due to the lack of historical operational data. Aiming at the identification of taxiing hot spots in multi-runway airports, a fast identification method based on Monte Carlo simulation is proposed. Firstly, the ground network model of airport flight area is modeled using Dijskra algorithm to determine the set of Q shortest paths between any current node in the airport ground network and the runway entrance or parking area. Then, the traffic flow and aerodrome control rules are modeled, identifying the hot spots of multirunway airport via Monte Carlo simulation. Taking the double runway “West Takeoff and East Landing”,operation of Changsha Huanghua Airport as an example, the simulation result and published taxiing hotspots in AIP CAAC are compared, verifying the validity of the proposed approach.

Nonlinear steady state control of small turbofan engine based on LMI

CAO Huiling, ZHENG Lijiu

2020, 38(3):  12-17. 

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Aiming at the strong nonlinear characteristics of aero-engine, a general nonlinear term is introduced based on its linear state space model to broaden the working range of it. Based on the nonlinear model, a generalized Gronwall-Bellman lemma is applied to design a steady state controller. Then the performance of the controller is verified by applying the Lyapunov stability theorem. DGEN380 engine is taken as simulation object, and the above controller is simulated. Simulation results verify the effectiveness of the current method.

Rutting profile characteristics and evaluation indices under aircraft wheel load

LI Yue, ZHAO Fupeng, CAI Jing

2020, 38(3):  18-12. 

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Rutting profile characteristic obtained from ordinary rutting test can be quite different from the actual situation,which makes the rut depth indices insufficiently representative. Based on the CC5 test carried out by NAPTF, a 3D rutting analysis model of flexible pavement structure is established by using ABAQUS. A load curve of halfsine wave is adopted to simulate the cyclic load process of the moving aircraft gears. The feasibility and accuracy of the model are then verified and evaluation indices are proposed considering the complexity of rutting profile characteristics. The load position lateral shift of aircraft gears is well reproduced in the simulation, therefore a series of turning points appeared in the rutting curves. The rutting depth of such points were then extracted, and the average rut depth and standard deviation were obtained after processing. Analyzingresults indicate that the average rutting depth and standard deviation can be used to describe the full-section feature of rutting profile.The environment temperature has notable impact on the distribution and development of rutting deformation. The simulated average rutting depth under the condition of 50益can be higher than that of the CC5 the results by 40%, and the standard deviation was increases by 70%.

Thin layer repair material for airport pavement

CHENG Guoyong, YANG Yiheng

2020, 38(3):  23-27. 

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It is difficult to repair or achieve a satisfactory repair effect because of the non-stop flight regulation and cement concrete deformation characteristics under load. Epoxy resin (epoxy value is 0.44) and polyamide resin are used as curing agent. Glass layer, mica powder, alumina, titanium oxide are used as fillers of pavement surface thin layer repair materials. Performance indices of the four proportioning schemes are tested including BPN, impact resistance, wear resistance (TD value) and durability. Testing result shows that the BPN of the thin layer repair material under the designed proportioning is increased by 14%~27%, the impact resistance is increased by 140%~320%, TD values of all the four proportion schemes are more than 0.7, and all the loss rates of high temperature and freeze-thaw tests are less than 2%, the second proportioning scheme has the best comprehensive properties.The test result can provide technical reference for the proportion of airport pavement thin layer repair material.

Flight support Petri net construction based on Bayesian network structure learning

XING Zhiwei, CHEN Zhe, XIA Huan, LUO Qian, CONG Wan, CHEN Fenghua

2020, 38(3):  28-33. 

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Due to the limitation of airport resource and time window during peak hours, the actual process of flight support will be biased compared to the planned process. K2 algorithm of Bayesian network structure learning is employed into flight support working scenarios, proposing the Bayesian network structure learning model of flight support.Bayesian network and Petri net are combined to build a Bayesian acyclic Petri net in order to accurately describe the status alternation of aircraft during flight support procedures. Finally, the actual data of one domestic hub airport are used to construct flight support network structure. Experimental analyses show that the flight support network obtained from historical data can better fit the actual working flow.

International route network optimization for airline alliance under uncertain demand

YANG Wendong, SHAO Jiajia, ZHENG Wenjuan

2020, 38(3):  34-39. 

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Taking the collaboration network of alliance airlines as the research object, based on the three-subscript model of hub-and-spoke network, and in response to the uncertainty of passenger demand, a stochastic programming model for the international route network optimization for airline alliance is constructed. The relatively better consistent international gateways, as well as the transportation paths and flows that vary with different scenarios can be obtained. Two indicators are proposed to evaluate the improving extent of the solution obtained from stochastic program than the deterministic approaches. The superiority of the stochastic programming model is verified by example analysis, providing useful decision-making reference for the construction and optimization of international route network for airline alliance.

Design of price-based airfare search method

ZHANG Honghai, PENG Mingtian, LIU Kaisheng

2020, 38(3):  40-44. 

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Aiming at the complex airfare combination and huge search space in the current civil shipping price search method, a Price-based airfare heuristic search method is proposed. Heuristic search algorithm is used to estimate the price and comfort of potential trips through travel experience data, eliminate unreasonable combinations, and screen out the final results that meet the individual needs of passengers. By constructing the travel experience information database, the design of airfare index, freight route selection, airfare splitting and combination is optimized, and the solution space is reduced. The high-performance search of airfare combination has been realized,and the service quality of passengers‘ticket purchase has been improved.

Engineering and Technology

Fault classification method for transmission line based on voltage amplitude and SVM

FEI Chunguo, HUO Hongshuang

2020, 38(3):  45-49. 

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In order to realize the fast and accurate classification of high voltage transmission line fault, a fault classification scheme is proposed based on fault voltage signal amplitude and SVM. The half-circle fault amplititudes of threephase voltage intercepted after filtering just are applied as fault features in the novel scheme, being input to SVM intelligent fault classification system. After training and predicting, the scheme can identify fault types on
transmission line. According to system simulation results, the fault classification method can effectively improve the speed and the accuracy of fault classification, which is lightly affected by factors such as fault impedances,fault inception angles, fault location and so on. It has good adaptability and the accuracy of fault classification can reach 100%.

Kinematics simulation analysis on composite six-DOF platform

DONG Tingjian, WU Qingyu, WANG Yanan

2020, 38(3):  50-54. 

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Aiming at the disadvantages of the common six-DOF platform such as small motion space and large dimensional size, a composite six-DOF platform is designed. D-H parameter method is adopted to establish the platform linkage coordinate system, by which the basic equations and forward-inverse solutions of the platform kinematics are all obtained. SolidWorks is used to establish the 3D platform model, which is then imported into ADAMS for kinematics simulation and analysis. Simulation curves of displacement, velocity, angular velocity, acceleration and angular acceleration in x, y and z directions of the platform are analyzed, verifying the rationality of the platform structure design and providing theoretical basis for the optimization and strength check.

Restoration of finger vein image based on multiple scattering model

YANG Jinfeng, ZHANG Xirui

2020, 38(3):  55-60. 

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To improve the restoration quality of finger vein images and better describe the propagation characteristics of photons in skin tissue, a multiple scattering model is proposed by adopting GGD as convolution kernel to approximately describe the diffusion characteristics of photons during transmission and attenuation process in skin tissue. Then maximum filter and anisotropic diffusion filter are used to estimate the background lighting, and the transmission map is obtained by Laplacian sharpening and high lifting filter. MSSIM index is introduced to evaluate the quality of finger vein image restoration. Experiment results indicate that the proposed algorithm can effectively improve the restoration quality of finger vein images.

Basic Science

Dynamical analysis on stochastic three-specy model with impusive toxicant

GAO Yongxin, WANG Nana

2020, 38(3):  61-64. 

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A stochastic three-specy prey-predator model with Beddington-DeAngelis functional response and impusive toxicant input is studied in order to find out how white noise and impusive toxicant input influence the dynamics of the model. By analyzing the limit system of the proposed model, the sufficient conditions for extinction, mean strong persistence and superior bound with average time are supplied.