Abstract: Aiming at tram energy consumption of contactless power supply, a method is developed to reduce operating energy consumption and improve regenerative braking energy recovery when energy storage capacity is limited. The method can redistribute the three working conditions of traction, coasting and bra...
Abstract: In order to reflect the real driving characteristics and operating parameters of new-energy trams in rail transit, and provide a basis for the design and control of trams, a typical driving cycle was constructed. Firstly, according to the tram operation data and tram lines in the cities of Paris, Bu...
Abstract: In order to improve the economical efficiency of the fuel cell hybrid system, the parameters and the adjustment method of state of charge (SOC) in the power following energy management strategy were analyzed, based on the fuel cell hydrogen consumption and the power fluctuation rate. The power fluct...
Abstract: Metro medium-voltage ring-network power supply system has a complex structure and various devices, which plays a crucial role in the distribution and transmission of electric energy. The analysis of metro medium-voltage ring network supply system is of great significance. In the analysis of its netw...
Abstract: Traction substations operate in such modes as the rectification, rectifier turn-off, constant voltage operation of inverting-feedback devices, and maximum-power operation of inverting-feedback device. To achieve convergence in power flow calculation when the states of traction substations are uncert...
Abstract: Aiming at the special requirement of security and real-time performance in next generation high-speed railway wireless communication system, long term evolution-railway (LTE-R), a security and efficiency enhanced train-ground authentication scheme based on self-updated hash chain is proposed. In the...
Abstract: In order to effectively evaluate road network performance under major disruptive events, on the basis of a day-to-day traffic assignment (DTA) model, an urban road network resilience assessment model is proposed. With explicit consideration on the dynamic characteristics of traffic flow under a majo...
Abstract: Risk assessment of global navigation satellite system (GNSS) used in train localization services is essential to fulfilling safety requirements. In this work, GNSS and inertial navigation system (INS) are integrated to build train localization units. The fault detection and identification is realize...
Abstract: The current volume calculation method of sand and gravel carried by ship mainly relies on manual weighing and waybill transfer, which has the problem of low precision and low efficiency. To deal with this, an automatic volume calculation system of sand and gravel carried by ship is developed on the ...
Abstract: To evaluate the damage state of a long-span steel arch bridge under multi-dimensional earthquake loadings, a deck steel truss arch bridge was studied. A bridge elastoplastic fiber element model was established by OpenSEES code. Two damage index, i.e., strain and two-parameter damage index were selec...
Abstract: The shield tunnel and cross passage forming a spatial cross structure, is a weak link in the seismic resistance. To study the influence of the rigid and flexible connection forms on the shield tunnels in seismic response, the material parameters and proportions of the similar models in the shaking t...
Abstract: In order to study the seismic response of immersed tunnels with different joints and under overlying water, large scaled shaking table tests and immersed tunnels seismic response simulations were carried out. The main material of immersed tunnels model was granular concrete. The model scale ratio de...
Abstract: In order to find out the influence of the key block position on the mechanical behavior of the segmental structure of a shield tunnel, based on the Sutong GIL (gas-insulated transmission) integrated pipe gallery tunnel project, two typical working conditions, i.e., the key block being located at the...
Abstract: In order to study the bearing characteristics of the deep-buried tunnel anchorage in the fractured rock mass, and in the engineering background of Luding Dadu river Bridge, according to the peak shear strength parameters of the contact surface between concrete and rock mass obtained by in-situ test,...
Abstract: In order to study the transition characteristics with the high-speed air-water flow in the drop shaft of a deep tunnel drainage system, a hydraulic model test was conducted to observe the flow patterns in the process of drop shaft discharge, analyze the relationship between the maximum discharge and...
Abstract: Triaxial undrained creep tests under lateral unloading condition were carried out on the soft clay obtained from Ruian, Wenzhou, China to study the influence of lateral unloading path and structural properties on time-strain curves, isochronous curves and other typical creep properties. A creep stab...
Abstract: A subgrade project in Qinghai salt lake area, China was in a cold and dry geotechnical environment with strong concealed salt weathering. Taking the natural saline soil samples of the above subgrade construction project and soil samples of the built subgrade structure in Chaka Salt Lake area of Qing...
Abstract: The moisture migration caused by freeze-thaw cycle is the main reason for the instability of seasonal frozen soil slope in western Sichuan Province. It is an important means to master the rule of water migration by studying the spatiotemporal variation characteristics of permeability coefficient of ...
Abstract: In order to investigate the axial compressive properties of H-section steel-reinforced recycled aggregate concrete filled circular steel tube stub columns, the axial bearing capacity calculation formula of this kind of member was theoretically derived. Based on limit analysis and twin shear unified ...
Abstract: In order to solve the problem that bond-slip of new and old concrete interfaces and treatment of shear reinforcement bars are challenges for finite element analysis of precast concrete frame joints, different methods in ABAQUS available for simulating the behavior of new and old concrete interfaces ...
Abstract: Finite element program ANSYS/LS-DYNA was applied to study the deformation and energy of passive flexible protection system under rockfalls impact. Using the ANSYS/LS-DYNA explicit analysis, dynamic responses of the passive flexible protection system to impact loads of rockfalls in different motion m...
Abstract: In order to gain insight into the mechanical behaviors of China’s high-speed EMU (electric multiple unit) axles made of 30NiCrMoV12 and EA4T, both the in-serving and over-served axles were examined in their chemical composition, conventional tensile strength, fatigue, impact toughness, fracture toug...
Abstract: Linear induction motor (LIM) metro vehicles adopt either inside or outside axle boxes. Aiming at two kinds of LIM metro vehicles, the LIM vehicle-track coupling dynamic model was established respectively, in which the wheel axle was modeled as Euler beam, and the effect of the wheelset flexible defo...
Abstract: In order to study rail corrugation on sharp metro curved tracks, based on the theory that the friction-induced vibration causes rail corrugation, the similarity between a full-scale and a small-scale wheelset-track models was studied. Firstly, to determine if the wheel-rail creep force was saturated...
Abstract: Rail wear directly affects the safety of the railway transportation. To replace the current manual measurement methods and improve the measurement accuracy and efficiency, a laser rail full-profile visual measurement system was researched and designed to realize the dynamic measurement of rail wear....
Abstract: To improve the wheel tread strength and service life of high-speed trains after reprofiling, the numerical simulation of rolling strengthening for the wheel tread was carried out, and the process parameters of rolling strengthening were optimized. Focusing on the wheel of the CRH3 high-speed train, ...
Abstract: The rail of seamless track may break and form a broken gap at the weld and its heat affected zone under temperature force. In order to study the influence of rail broken gap on train operation, the wheel-rail contact force characteristics and the high-frequency dynamic response of the material is an...
Abstract: In order to study the wheel-rail matching relationship and applicability of the classical wheel-rail contact theory in turnout area, the finite element model of the wheel-rail contact in switch area was established, and several calculation programs of the normal force and tangential force on switch ...