Abstract: Under partial shading condition, the traditional MPPT (maximum power point tracking) is suitable for local optimisation, which cannot track to the global MPP. To solve this problem, a maximum power tracking method based on adaptive learning factor particle swarm optimisation is proposed in this stud...
Abstract: To understand the reliability and find the weaknesses in the relay protection system of urban rail transit traction substation to provide guidance for failure investigation, a reliability evaluation project of relay protection for urban rail transit traction substation was undertaken. First, the rel...
Abstract: The negative sequence is one of the main power quality issues in the tractive power supply system in our country. The structure and characteristics of a single three-phase combined co-phase power supply system are introduced herein, to study the impact of the negative sequence of a single three-phas...
Abstract: To analyse the lightning impulse breakdown characteristics of the parallel gaps of contaminated insulators with different salt densities, the SC-210 porcelain cross-arm insulator was used to conduct the lightning impulse test. Comparing with the electric field simulation results of the clean and con...
Abstract: An adaptive cuckoo optimization DV-HOP localization algorithm based on multi-communication radius and error correction (MEACS-D)is proposed, aiming at addressing the problem of lager error in wireless sensor networks of range-free DV-HOP algorithms. Using the anchor nodes, which have the ability to ...
Abstract: China’s railway communication networks have been deployed throughout the country and have a complex infrastructure. A security architecture based on trusted computing and software-defined networking (SDN) has thus been proposed for ensuring the security of the railway communication system. The secur...
Abstract: To solve the problems of traditional tunnel crack detection, such as low efficiency, subjectivity and poor safety, among others, a method of tunnel crack extraction based on adaptive threshold and connected domain marking is proposed using orientation and continuity characteristics. First, according...
Abstract: To ensure the security of quantum information, a quantum image encryption algorithm based on combining a chaotic system and DNA coding is proposed. Firstly, the image is expressed as a quantum superposition state, and the quantum image is then scrambled by a unitary matrix generated by logistic chao...
Abstract: Hyperspectral unmixing is a process for unmixing the mixed pixels of a hyperspectral image composed of several substances and their corresponding proportions. Extracting endmembers is a major problem in hyperspectral unmixing. Owing to the goal of achieving a large search range for the endmembers, t...
Abstract: To analyse the stress distribution of continuously welded rails at transition sections under the effect of temperature, a multiscale model of the transition section with two-terminal rail lines is proposed. Owing to the structural regularity of the two-terminal bridge and the subgrade extending from...
Abstract: Based on a mass-spring-damper(MSD)model and a mass-spring-damper-rigid mass(MMSD)model, which are two kinds of pedestrian simplified models, the equations of vertical dynamic interaction pertaining to a simplified human-structure were deduced by the regularization structure modal function. Using the...
Abstract: To study the internal forces and displacement of a piecewise stiffness compressive bar with a consideration of the second-order effect, displacement and rotation equations were established based on the displacement governing equation. The displacement coefficients were obtained according to the disp...
Abstract: The feasibility of a large-scale experiment for downburst in a boundary layer wind tunnel was investigated. Large eddy simulation (LES) was employed to investigate the characteristics of stationary and travelling downburst using the impinging jet and wall jet methods, respectively. The velocity prof...
Abstract: To realise the goals of energy saving and emissions reduction in the construction industry, a new retrofitting method of steel-jacket retrofitted columns with recycled aggregate concrete is presented. An unstrengthened column, twelve steel-jacket retrofitted columns, and two concrete-filled steel-tu...
Abstract: In order to study the isolating effect of the three dimensional laminated rubber bearings-dish spring bearing (LRB-DSB) isolation system, comprehensive analyses for its construction, mechanism, and design theory were performed. On the basis of these analyses, comparative studies of the vibration cha...
Abstract: To analyse the characteristics of the pore structure of foam concrete and reveal the relationships between various pore structure parameters, dense and non-dense packing structure models were established. A formula for the calculation of pore structure parameters, including porosity, surface area, a...
Abstract: The general problems encountered in obtaining accurate soil pressure test-data are determined by performing a literature review of the research on calibration devices for soil pressure cells. Then, a finite element simulation for the calibration of multi-range soil pressure cell equipment is perform...
Abstract: To study the influence of the rigidity index, strain softening, and strain rate on the cone factor of marine clay, cone penetration in clay is simulated on the basis of the finite element method, and an arbitrary Lagrangian-Eulerian (ALE) technique is adopted to control the quality of mesh under the...
Abstract: In order to analyze the influence of parameters on load transfer and deformation mechanisms of piled embankment with geogrid-reinforcement, a simplified method was proposed and employed for parameters analysis. A method including soil arching effect in granular material, subsoil resistance and membr...
Abstract: The asymmetric deformation failure characteristics and asymmetric mechanical behaviour of supporting structures in layered soft rock tunnels under high geostress, combined with the anisotropic mechanical properties of carbonaceous phyllite, were investigated. Based on the deformation data of 93 laye...
Abstract: Considering the disadvantages of poor air quality and prolonged dust removal caused by the forced ventilation mode in tunnel construction using drilling and blasting methods, the extractive and air curtain ventilation mode was developed by structure optimization and improvement over the traditional ...
Abstract: In a pavement distress survey, a wandering survey vehicle would reduce the accuracy of lateral position measurement of pavement distress. The errors in the measurement of distress lateral position can be eliminated based on the lane marking identified using an edge detection algorithm. However, the ...
Abstract: To measure the severity of high-speed train delays, the distributions models of the affected trains, owing to different cause-based primary delays, were established using statistical modeling. First, the train operation records during 2014 and 2015 obtained from China Railway Guangzhou Group Co. Ltd...
Abstract: In order to solve the reusable logistics resource(RLR)allocation problem where some uncertain parameters cannot be estimated using historical data, and the types and dimensions of RLR are varied, a multi-scenario optimisation model for RLR allocation was studied using the method of scenario planning...
Abstract: Given the reform in railway freight transportation, the authors developed an end-to-end logistics service to respond more promptly and effectively to customers’ diverse, individual needs. They built a Web-based service model, incorporating all the characteristics of traditional logistics services. T...
Abstract: Human-robot interaction performance was evaluated, and better exoskeleton structures and human-robot adaptability control strategies were explored. The muscle activity, paired-muscle contraction index, and synergy coupling of the muscles of nine healthy male subjects carrying loads and walking with ...
Abstract: To study the influence of different errors incurred during ultrasonic residual-stress detection on test data concerning key components of high-speed trains, the relationship between the anisotropy of A5083 and 6005A materials, in terms of texture and ultrasonic propagation time, was investigated. Th...
Abstract: It is difficult to actively control the thermal cycle in wire and arc additive manufacturing(WAAM), resulting in uneven microstructures and poor mechanical properties. Therefore, an anisothermal quenching and tempering process for bainite steel deposition is presented herein. The microstructures and...