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ISSN 1674-2850
CN 11-9150/N5
 
Current Issue
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June 30,2014
Volume 7,Issue 12
Pages -
Subject Area:Control and Navigation Technology of Aaerocraft
 
Title: Design and implementation of BeiDou receiver based on ARM+FPGA
Authors: LIU Jingchao, DENG Zhongliang, YIN Lu
PP: 1219-1223
Abstract: To implement the receiring of BeiDou (BD) satellite navigation signal, a navigation receiver system is designed based on ARM+FPGA. The SE4120 chip is used as the receiver’s radio frequency (RF) front-end. The AT91SAM9G20 chip based on ARM9 core and the Cyclone III series EP3C120F484 chip are used as the base-band processing part. And the receiver’s software design is explained, including the capture engine, tracking engine, demodulation messages, and position resolution. The proposed receiver can demodulate the BD signal.
Keywords: aircraft control, navigation technology; BeiDou; ARM+FPGA; receiver
 
Title: Design of adaptive sliding mode entry guidance law for Mars probe
Authors: XU Kang, MA Guangfu, LI Xiaoyu, ZHOU Yuanqiang
PP: 1213-1218
Abstract: Considering Mars probe entry guidance law design problem, an adaptive sliding mode guidance law is presented. Firstly, the entry motion model of Mars probe is established and lateral motion model is linearized. Based on existing performance index, a nominal trajectory is designed using Legendre pseudo spectral method and drag. Then, a neural network is introduced to approximate the uncertainty throughout whole entry phase and an adaptive sliding mode guidance law is designed based on it. At last, simulation results show a more effective performance of the guidance law presented in this paper compared with traditional proportion differential guidance law.
Keywords: aerocraft control, navigation technology; Mars probe; entry phase; pseudo spectral method; neural network; adaptive sliding mode guidance
 
Title: Red-light-running characteristic analysis for signalized intersections
Authors: WANG Xuesong, ZHONG Chujun, WANG Ting
PP: 1207-1212
Abstract: A case-control field observation study was performed in Shanghai to better understand the characteristics of red-light-running and its influence factors. Red-light-running violation data were collected through manually observation as well as video recording at four signalized intersections. A control group of vehicles were observed which had opportunity to run red light but did not. The results showed an average value of 1.5 red light violators in each signal cycle at one intersection approach. The number of red light violators decreased by the length of the red light time. More red light violators turned left when they ran the red lights and more red light vehicles were in the middle of the fleet. It was also found that male drivers, vehicles with local license plates, driving without passengers were more prone to run red lights. Investigation location, approaching lanes and passengers were factors which affected red-light-running behavior significantly.
Keywords: traffic and transportation safety engineering; red-light-running characteristic; case-control analysis; signalized intersection; characteristic
 
Title: Core link identifying method in road-networks based on information centrality
Authors: WU Zhengyan, MO Shixu
PP: 1199-1206
Abstract: In order to improve the efficiency and effectiveness of traffic management in complex road network, this paper proposed the core link identifying method in road network structure on the basis of the fundamental idea of information centrality (IC). The characteristics of which included the following two aspects: 1) the traffic function of links were characterized respectively from transportation efficiency, connective efficiency and comprehensive efficiency different angles; 2) the design of efficiency function of road network combined with the consideration of the mean shortest route length and its capacity. A case study based on actual road network had been carried on, and the results showed that the proposed method had the feasibility and practicability.
Keywords: transportation system engineering; core link; information centrality; road network; traffic management
 
Title: Arrangement research of tracking photovoltaic array on ships
Authors: SUN Zhongyu, TU Rong, HE Shilong
PP: 1193-1198
Abstract: The main application of solar energy on ships is photovoltaic power generating system. It is necessary to research the solar panels layout on the ship considering the features of ships and water environment. The optimization results of tracking layout are gained by analysing the calculation of solar radiation in different areas of photovoltaic array according to the characteristics of photovoltaic array different tracking types. The results show that the tracking sun is better than the azimuth tracking, but it has larger regional differences.
Keywords: ships and warships engineering; solar ship; photovoltaic array; tracking mode; azimuth angle; layout optimization
 
Title: Two calculation methods for car ferry barge total longitudinal strength of Nan Zhang river
Authors: XU Biao, LIU Jiaxin
PP: 1185-1192
Abstract: Through the thin-walled beam theory and finite element analysis of ship structure, this article checks the car ferry barge longitudinal strength of Nan Zhang river, and analyses the comparison of the results . The theory of the thin-walled beam considers the most dangerous loading status of the ship, and retains a certain safety factor, so it is appropriate for the majority of the ships. Longitudinal strength of ship model calculated by finite element can be as a good complement to thin-walled beam theory, and it will become the development trend in the future. Through the discuss on these two calculation methods and combining with the figure legends, the calculation results are given. In addition, the advantages and disadvantages of these two methods are cleaned, which have a certain reference value.
Keywords: ships and warships engineering; thin-walled beam theory; finite element; total longitudinal strength
 
Title: Research on impedance characteristics of electric multiple units MR-139 earthing resistor
Authors: XIAO Shi, WEN Yinghong, ZHANG Jinbao, CHEN Song
PP: 1179-1184
Abstract: This paper researches high frequency characteristics of earthing impedance on basis of MR-139 and discusses the high-frequency parasitic parameters introduced by resistor mechanical structure. At the same time, the high frequency equivalent circuit model of the element is built, and simplification of prediction for the design process is proposed. Furthermore, the simple measurement method is designed, which can realize the online test of dynamic characteristics including shock impedance characteristic, high-frequency impedance characteristic and temperature drift characteristic in the field of earthing impedance.
Keywords: railway signaling and communication engineering; electric multiple units; electromagnetic disturbance; earthing resistor; MR-139
 
Title: Spectrum analysis of aerodynamic noise source on surface of a high-speed train
Authors: CUI Pengxiang, LI Renxian
PP: 1173-1178
Abstract: Large eddy simulation method is used to solve the fluid field equations around a high-speed train. From the solutions of these equations, aerodynamic pressure pulsation distributing on the train surface is obtained. Consequently, the pressure pulsation definition in time domain is converted to sound intensity definition in frequency domain by Fourier transform. After that, the characteristic of frequency spectrum of dipole source intensity at any point can be obtained. Calculation results show that the maximum value of dipole sound intensity appears when the frequency range was lower than 1 000 Hz, large sound intensity appears at the position of separate eddy of air and the maximum sound intensity appears at position of the first bogie.
Keywords: vehicle engineering; high-speed train; aerodynamic noise; dipole sound source
 
Title: Analysis of the balance suspension dynamic performance based on RADIOSS
Authors: HUANG Shuo
PP: 1165-1172
Abstract: Balanced suspension is often used in heavy duty vehicle to connect the axle with the frame. Relatively, it can make the two rear axles move more independent and it can also make their structures more complex. This topic finished the finite element mesh division in the parts of balance suspension. According to the dynamic performance analysis of how this performance changes during the BLOCK slover based on the RADIOSS nonlinear contacted with the balanced suspension, this topic studied the influences of the different contact types and contact parameters on calculation results. Finally, it compared the simulation results with the actual engineering situation. The results showed that, the maximum stress exceeded the allowable stress of the balance shaft support materials.
Keywords: vehicle engineering; balanced suspension; RADIOSS; contact; dynamic properties
 
Title: Structure parameter optimization of the six-air-cushion boot walking concept vehicle
Authors: HE Dengbo, MA Cong, YU Fan, LUO Zhe
PP: 1159-1164
Abstract: Based on a novel soft-terrain concept vehicle with a walking mechanism by using six air-cushion boots proposed in previous study, the structural parameters of the vehicle has been optimized through multiple-constraint condition optimization. The structure and working principle of the vehicle are described firstly. Then the constraint conditions are proposed according to the structure and working mechanism of the new walking concept vehicle. With the constraint conditions, the mathematical equations are established and the multiple-constraint condition optimization is conducted in Matlab in order to determine the structure parameters of the six-air-cushion boot walking concept vehicle. The structural parameters are determined in the end.
Keywords: vehicle engineering; soft-terrain vehicle; multiple-constraint condition optimization; air-cushion boot; structure design
 
Title: Research on the material matching method for auto-body key safety components based on car side impact
Authors: WU Suzhen, ZHENG Gang, ZHANG Wen
PP: 1150-1158
Abstract: Based on sensitivity analysis approach and multi-objective optimization approach, a material matching method for the design of auto-body key safety components associated with side crash was proposed. Firstly, a full vehicle finite element model was established for the side impact simulation, and a side crashworthiness evaluating index was proposed. Secondly, in order to minimize the design space, key components related to side impact crashworthiness were selected by load path analysis and orthogonal design sensitivity analysis. Finally, by combining approximate technology and multi-objective algorithm, an optimized material matching plan was given out, and as a result the side impact crashworthiness of the vehicle enhanced. The results showed that the proposed optimization procedure could not only improve the crashworthiness of side structure, but also realize the lightweight of vehicle, and this method had high accuracy and strong practicality.
Keywords: vehicle engineering; material matching; side impact; sensitivity analysis; multi-objective optimization
 
Title: Precise transfer matrix method for stability analysis of high pier
Authors: YIN Junhong, LI Qingning
PP: 1144-1149
Abstract: In this paper, the precise transfer matrix method was used in the stability analysis of high pier. In the light of the dynamic stability analysis, we put forward that let precise transfer matrix method combine with vibration mode decomposition response spectrum method to deduce the transfer matrix of dynamic response for high pier under dynamic action. According to the dynamic instability criterion of high pier for dynamic stability analysis, the dynamic critical load of high pier was got. The comparing of the method with ANSYS calculation results proved the accuracy and effectiveness of the method. The results showed that mechanics concepts were clear, calculation was fast and mechanical transmission characteristics were reflected well. The theory is suitable for engineering application.
Keywords: road works; stability; precise transfer matrix method; high pier; dynamic reaction transfer
 
Title: Research on service level classification of safety on expressway
Authors: SUN Yixuan, SHAO Chunfu
PP: 1138-1143
Abstract: Expressway traffic safety service level classification system had been established to evaluate the safety service level of expressway in this research, which were based on depth study of the expressway traffic accident causes, internal mechanism and traffic accident frequency estimation model. In the empirical study, the negative binomial model had been chosen to describe the expressway traffic accident which represented the discrete and occasional characteristic. Regression parametric fitting by STATA had indicated that oversize vehicles mixed rate, curve ratio, average longitudinal slope, curvature, curved-slope combination and the special section were the most significant variables for the expressway traffic accident. Based on the estimation model, the criterion system of expressway traffic safety services level was established and the expressway safety service level classification was provided based on road traffic ratio.
Keywords: road works; expressway; traffic accident factors; traffic accident estimation model; service level of safety
 
Title: Research on the mechanism of driver’s visual behavior impacted by urban traffic environment
Authors: CHEN Yuren, CAI Yang
PP: 1128-1137
Abstract: In this paper, the real vehicle driving tests have been done with “eye tracker” (SmartEye) under different urban environments, which are used to examine eight different driving experience driver’s eye movement behavior differences. The driver’s visual scenes are stratified into meaningful layer, motion layer, physical layer and landscape layer. A driver’s visual scene hierarchical model by these four layers has been established in this study. On this basis, the mechanism of driver’s visual behavior impacted by urban traffic environment has been analyzed. Research shows that the different road traffic environments will affect the driver’s horizontal/vertical search range, average fixation duration time and average saccade eye movement time. The degree of influence of each factor to different driving experience driver is not exactly same. This research provides technical reference to innovative design and evaluation of urban road traffic. It could make the urban road traffic environment better to meet the needs of different people safe and comfortable driving.
Keywords: road works; urban road; visual behavior; driver’s visual scene hierarchical model; impact mechanism
 
Title: Summary of the fatigue and self-healing evaluation methodologies of asphalt mixtures using DMA
Authors: WANG Haopeng, YANG Jun, GONG Minghui
PP: 1119-1127
Abstract: The paper outlined dynamic mechanical analysis (DMA) methods and ways to introduce rest period on the basis of analyzing asphalt and asphalt mixtures’ properties. Three types of self-healing index based on the modulus, dissipated energy and pseudo strain were summarized, while the advantages and disadvantages of healing index were argued. In conclusion, the sensibility analysis of multi factors combining pseudo strain with dissipated energy was a scientific and effective method to research fatigue damages and self-healing behaviors of asphalt and mixtures, also contributing to establishing self-healing evaluation models of asphalt and mixtures.
Keywords: road works; asphalt; review; self-healing; dissipated energy; evaluation methodology