In an AC system with parallel operation of electricity-hydrogen micro-grids, when adopting traditional control methods, the difference in output line impedance will affect inverters, and large circulating currents occurs such that a reasonable distribution of active power become inaccessible. Given ...

A switched system is a class of complex systems that integrate a series of continuous or discrete subsystems and switching mechanisms. State-dependent switching systems have not been studied in depth due to complexity. Therefore, the modeling of state-dependent switching systems is explored through ...

In order to study the distribution of current circulation and potential of the train’s body–axle end of the dual-system train in different power supply system sections, the chain circuit model of the train grounding system was established based on a dual-system train, and a united traction power sup...

Relationship is explored between the wire shape and concentrated load of catenary messenger wires in static and vibrational states. The parabola method is used to determine the messenger wire shape in static state. By constructing the differential equation and using the Fourier transform, the messen...

Chaotic systems have the characteristics of nonlinearity, pseudo-randomness and sensitivity to initial values, which provides an anchor to construct S-boxes based on dynamic system and secures block encryption algorithms. At present, most chaos-based S-box construction methods is designed to optimiz...

In order to enrich the dynamic characteristics of a low-dimensional discrete chaotic system and overcome the problem of low security of chaotic image encryption system caused by the introduction of deoxyribonucleic acid (DNA) coding, a 2D discrete chaotic system with constant positive Lyapunov expon...

Breast ultrasound images have large intra-class differences, small inter-class differences, and complex and variable nodule shapes. In order to address these issues, a breast ultrasound image algorithm with morphological feature recalibration was designed to realize automatic diagnosis of breast ult...

Most of existing synthetic aperture radar (SAR) image generation methods fail to generate SAR images and their detection labels simultaneously. A position-based conditional generative adversarial network (PCGAN) is constructed for SAR ship image generation and target detection. Firstly, ship positio...

In satellite communications, leveraging adaptive beamforming technology can significantly improve the anti-jamming ability of navigation receivers. However, conventional adaptive beamforming algorithms are sensitive to model mismatch. In order to overcome the performance degradation of conventional ...

Distributed optical fiber vibration sensor based on phase-sensitive optical time-domain reflectometry (Φ-OTDR) has important application prospects in railway perimeter security. In order to reduce the influence of inherent interference fading in Φ-OTDR on phase demodulation and improve the recogniti...

Interferometric synthetic aperture radar (InSAR) is greatly affected by ionospheric delay, especially at low and high latitudes, which decreases the number of available interferometric pairs for time-series InSAR and the monitoring accuracy of low-frequency SAR systems. To this end, the reformulatin...

Aiming at the transformer fed by cascaded H-bridges with carrier phase-shifted (CPS) sinusoidal pulse-width modulation (SPWM), a fast method is proposed to calculate the iron loss on the basis of the classical loss separation model. Firstly, the lumped duty cycle of the SPWM voltage waveform is defi...

In order to simulate the motion process of the levitation system of high-speed maglev trains and analyze the system response under different conditions, it is necessary to establish a levitation system model and conduct controller design and simulation analysis. Firstly, the basic structure and work...

The existing hybrid drive technology is mainly based on the hybrid power of oil electricity or liquid, and it aims to improve the energy utilization rate of conventional fuel vehicles and reduce fuel consumption and emissions. Based on the high power density and energy regeneration advantages of hyd...

In order to investigate the influence of different ground motion inputs on the seismic isolation of a long-span soft arch bridge, the response law of the bridge structure under near-field and far-field ground motions was analyzed by nonlinear finite element model, and the optimal arrangement scheme ...

In order to study the dynamic response characteristics of long-span highway-railway cable-stayed bridges with broken cables under the dynamic actions of wind and train, an actual cable-stayed bridge was taken as the research object, and a 3D computational model of the whole bridge was established. T...

To analyze the effect of a void under the existing pipeline on its deflection response during tunnel undercrossing construction, a theoretical model and an analytical solution of the uncoordinated deformation of the existing pipeline and soil induced by tunnel undercrossing construction were present...

To analyze the effect of a void under the track slab on the rail deformation of a ballastless railway caused by tunnel undercrossing, an improved calculation method was proposed to predicate the tunnel undercrossing-induced rail deformation of the ballastless railway. Firstly, the rail of the ballas...

In order to study the effect of subway vibration on the dynamic response of different types of subway stations and their superstructures, three kinds of combination types, namely “soft combination”, “hard combination Ⅰ”, and “hard combination Ⅱ” were proposed based on the differences in the main bea...

In order to ensure the smooth change of cable-strut internal forces before molding cable domes, a construction optimization method is proposed, focusing on alternately lifting the inner ring and tensioning the outermost diagonal cables. The lifting height of the inner ring is first optimized for min...

The CPⅢ network of high-speed railways is a resection surveying network with free station observation and automatic observation, enabling simultaneous edge and angle measurements. The separability of gross errors between observations is not only related to the design space of the control network but...

One of the key problems in the construction of the electrification reconstruction project of Gela section of Qinghai−Xizang Railway is to ensure the frost jacking stability of the pile foundation of the overhead contact system mast (OCSM). In order to study the anti-frost jacking performance of pile...

As an effective waterlogging control measure, deep storage tunnel systems have air pocket retention during the inflows of multiple shafts, causing issues like pressure surges and threatening the safety of system operation. According to the deep storage tunnel project of Suzhou section, a dual-shaft ...

When the traditional Monte Carlo sampling method is applied to complex reliability problems such as small failure probability, there are some shortcomings such as low efficiency and limited accuracy. To solve this problem, a spherical layer sampling analysis method is developed. Firstly, by dividing...

In order to clarify the effect of temperature on the layered mechanical properties of carbon fiber wires, while the critical temperature is considered, the gravitational strain distributions of each wire layer, strand and section in the breaking force conditions are calculated at temperatures driven...

In order to study the calculation method of the compression bearing capacity of the inclined members of the transmission tower with joint constraints, the failure mode, bearing capacity, and deformation form of the arranged minimum axis and parallel axis of 120 equal angle steels were obtained throu...

Improper lane-changing may pose a threat to traffic safety, leading to traffic accidents and congestion. Therefore, it is necessary to explore lane-changing trajectories for different driving styles at lane exits. The trajectory data of vehicles from congested scenarios on Chinese highways and expr...