最新刊期
卷 ， 期 4 ， 2024
- 摘要：With continuous advancements in technology, customer requirements for converters, particularly quality indicators, are steadily increasing, driving the evolution of converters towards lighter weight, lower noise, higher reliability, and improved aesthetics. This paper delves into the key generic technologies in the design of converters for rail traffic, covering critical areas such as the application of power devices, lightweight design, vibration and noise reduction, electromagnetic compatibility, thermal management, and industrial design. It provides an overview of the current development status of these technologies both domestically and internationally, summarizes the challenges and difficulties encountered in their further development, and discusses in detail the core role these technologies play in enhancing product market competitiveness based on practical application examples. The findings provide comprehensive references and technical guidance for designing converters that are lighter, quieter, more reliable, and more aesthetically pleasing.关键词：converter;generic technology;vibration and noise;electromagnetic compatibility;thermal management;industrial design;lightweight
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发布时间：2024-09-12 - 摘要：In response to the increasing demands for passenger comfort on high-speed trains, this paper investigates control methods and standards for electromagnetic noise generated by traction motors. The initial analysis examined the noise characteristics of traction motor sources under the power supply by converters, as well as those inside high-speed trains from the perspective of sound quality. This effort identified key areas for motor noise control. Subsequently, by combining the sound insulation properties of car bodies and the characteristics of sound sources, specific noise control targets were established for motor sources, including two aspects: sound pressure levels (SPL) and differences in one-third octave bands. Furthermore, the effectiveness of the proposed noise control methods was verified through practical applications in specific cases. These methods have significantly improved the subjective listening experience of passengers, while meeting the requirements for interior noise levels of car bodies. The study outcomes not only provide effective means for electromagnetic noise control in high-speed trains but also serve as an important reference for improving the operational comfort of rail transit.关键词：traction system;electromagnetic noise;noise control;sound quality;high-speed EMU
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发布时间：2024-09-12 - 摘要：Stray inductance present in the commutation loop of converters significantly impacts power semiconductor devices. However, accurately extracting stray inductance from large-size power capacitors remains challenging. While the discharge method is the current standard extraction technique, it is unsuitable for capacitors containing multiple resonance frequencies. Leveraging the high accuracy of the integral method in extracting stray inductance from busbars, an extension has been made to extract stray inductance from large-size power capacitors. Enhanced by a clarified error correction process, the results of the integral method are considered accurate. Despite the integral method yielding highly accurate results, it demands substantial testing resources, poses high-voltage safety hazards, and exhibits low efficiency. This paper presents a stray inductance extraction method utilizing an impedance analyzer, and provides a detailed explanation of the testing fixture and impedance compensation method. Comparing the results obtained from the impedance analyzer with those from the integration method revealed an error of less than 7.3%, which proved the accuracy of the proposed extraction method. In addition, this method offers convenient measurement, strong reusability and high efficiency, without the risks associated with high-voltage testing.关键词：large-size power capacitor;stray inductance;discharge method;integral method;impedance analyzer;testing fixture
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发布时间：2024-09-12 - 摘要：This paper analyzes common-mode resonance in high-frequency auxiliary converters and explores a suppression approach by introducing an efficient common-mode equivalent modeling method. Firstly, the converter system with multiple noise sources was equivalently represented using several models with a single noise source. This significantly reduced the system complexity, facilitating the analysis of resonance generated by specific noise sources. Secondly, the generating mechanism of common-mode resonance was uncovered, by investigating the time-frequency characteristics of common-mode current and the transfer admittance characteristics of interference coupling paths within the chopper circuit of high-frequency auxiliary converters. Finally, a method for suppressing resonance at the sources was proposed, and its effectiveness was validated through simulations and experiments.关键词：high-frequency auxiliary converter;common-mode noise;interference modeling;coupling path;resonance suppression
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发布时间：2024-09-12 - 摘要：This paper aims to improve the service reliability of main terminal connectors for power modules in the service environment of high-speed EMUs. To achieve this, the fatigue reliability of the solder layers in the main terminal structure of insulated-gate bipolar transistors (IGBTs) was studied through finite element analysis. In addition, the fatigue life of the solder layers was predicted by leveraging different theories and the prediction results were verified by power cycle experiments. The study results show that the number of cycles decreases slightly with the increase in the void rate of the solder layers. Additionally, as the solder layer thickness increases, the number of cycles initially increases before subsequently decreasing. During the power cycle experiments, the degradation of the solder layers manifests as the coarsening of the grey phase containing Sn. The analysis obtained using the energy-based Darveaux model more closely aligns with the degradation process of the solder layers in the main terminal structure of IGBTs. Hence, the thickness of solder layers is identified as the primary influencing factor on the service life of the main terminal structure.关键词：high-speed EMU;insulated-gate bipolar transistors (IGBT), solder layer fatigue;reliability;finite element analysis
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发布时间：2024-09-12 - 摘要：This paper focuses on mitigating inductive interference caused by the traction systems of rail transit trains on track circuits. The initial analysis explored the interference mechanisms through inductive coupling. Based on the real layout and wiring of DC traction systems in metro applications, a 1:1-scale induced voltage testing platform for traction systems was built, as the first of its kind in domestic laboratories. This platform was employed to simulate transient inductive interference generated by train traction systems at the receiving end of track circuits under static laboratory conditions. These simulations revealed the induced voltage levels produced by different interfering components and coupling loops on track circuits, under different operating conditions of the traction systems and various relative positions of the track circuits. Moreover, the coupling circuit formed by the DC chopper and braking resistor during resistance braking was identified the maximum source of inductive interference from metro DC traction systems affecting track circuit systems. Additionally, by analyzing the relationship between the spectrum characteristics of induced emissions from the traction systems and the IGBT switching frequencies for chopping, a spectrum management method was adopted to reassign induced emissions characteristic frequencies of traction systems, resulting in staggered sensitive frequency bands for the track circuits. The experimental results demonstrate the effectiveness of the proposed inductive interference suppression strategy in reducing the risk of inductive interference caused by train traction systems on the track circuits.关键词：traction system;track circuit;induced voltage;DC chopper;spectrum management
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发布时间：2024-09-12
Converting Basic Technology Column
- 摘要：Suspended monorail trains represent an important component of urban rail transit and this mode of transportation is regarded as promising for applications in China. This paper begins with an introductory interview of the development of suspended monorail trains and subsequently analyzes the technical schemes of the Optics Valley Photon suspended monorail trains from various perspectives, including the general design, bogie system, car body system, electrical system, braking system, and network system. It further elaborates on key performance aspects such as safety, intelligence, low-carbon emissions, and environmental protection. The Optics Valley Photon suspended monorail trains have been successfully verified through simulation testing and experiments at both the component and vehicle levels. Furthermore, actual train operation on the track has demonstrated overall performance in alignment with industry application requirements.关键词：suspended monorail train;bogie system;network system;intelligence;Optics Valley Photon;urban rail transit
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发布时间：2024-09-12 - 摘要：Compared with conventional rail transit vehicles, suspended monorail trains (sky trains) have great differences in vehicle structure, which contribute to their unique noise characteristics and underscore the value of researching this mode of transportation. In this study, the vibration noise characteristics of sky trains were explored, based on the source-path-receiver mode, and a low-noise scheme was designed to control vehicle noise indexes. Additionally, a simulation and prediction model for vehicle noise was established by utilizing the statistical energy approach (SEA). Furthermore, verification was conducted through noise path experiments, and the results showed a high degree of consistency with the simulations. Sky trains offer significant advantages over conventional rail transit vehicles in terms of noise control, highlighting their ability to better meet noise standards and ensure stable operation.关键词：suspended monorail train;source-path-receiver;noise characteristics and control;simulation and prediction for vehicle;noise experimental verification
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发布时间：2024-09-12 - 摘要：This paper aims to clarify the relationship between the snow-removal characteristics of an EMU mode intended for export to Europe and the geometrical configuration of its obstacle deflector panels, while maintaining a consistent snow-removal cross-section, and guide the topological configuration design for these panels to ensure their effectiveness under snow loading. A numerical model describing the impact of the EMUs on accumulated snow on tracks was constructed, using the smoothed particle hydrodynamics method. This model was then utilized to analyze snow movement, snow-removal resistance, energy consumption power under various rake and flare angles of the obstacle deflector panels. The results reveal a close relationship between snow movement and the rake and flare angles. Adjusting these angles can affect the height of snow movement in the z direction and the speed in the x direction, thereby preventing flying snow from blocking the driver's sight and ensuring the safe operation of the EMUs. The rake angle is found to influence both the magnitude and direction of z-directional snow-removal resistance, despite having little effect on x-directional snow-removal resistance. As the flare angle increases, x-directional snow-removal resistance increases, whereas z-directional snow-removal resistance first increases and then decreases. Moreover, the snow-removal energy consumption and power of the EMUs exhibit low correlations with rake angles of the obstacle deflector panels and positive correlations with flare angles. Therefore, reducing flare angles can effectively decrease snow-removal energy consumption and power, leading to load reduction and energy conservation.关键词：EMU;obstacle deflector panel;snow;snow-removal characteristic
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发布时间：2024-09-12 - 摘要：Traditional bogies negotiating on curves with small radii result in large angles of attack for the steering wheelsets, leading to serious wheel-rail wear. Double-axle forced-steering bogies are effective in reducing such angles of attack, but they feature an intricate structure. In contrast, single-axle forced-steering bogies can also reduce these angles of attack, thereby improving the curve negotiation performance of the vehicles, while offering a comparatively simpler structure. Based on these considerations, dynamics models were established, respectively incorporating traditional bogie, double-axle forced-steering bogie, and single-axle forced-steering bogies, for a specific model of railway service cars, which served as the research object, to compare their curve negotiation performance. Additionally, the influence of the positions of the radial mechanism and power wheelset on the curve negotiation performance of the railway service cars was evaluated, considering the effects of traction force and bidirectional operation. This comprehensive analysis led to the optimal layout of the single-axle forced-steering radial mechanism and power wheelset. Furthermore, the stability and curve negotiation performance of railway service cars with this single-axle forced-steering bogie configuration were analyzed. The results show a slightly lower critical speed compared to railway service cars with traditional bogies and double-axle forced-steering bogies. The single-axle forced-steering radial mechanism configuration proves effect in reducing the lateral force on the wheelsets, the derailment coefficient, and the angle of attack for the wheelsets. Specifically, relative to the traditional bogie configuration, the lateral force on the wheelsets decreased by 9.51%, the derailment coefficient is reduced by 11.32%, and the angle of attack for the first-position wheelsets fell by 52.49%.关键词：forced-steering bogie;radial mechanism;single-axle;angle of attack;derailment coefficient
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发布时间：2024-09-12 - 摘要：This paper focused on analyzing the influence of unsteady aerodynamic forces on the stability and safety of a specific intercity electric multiple unit (EMU) model subjected to strong crosswinds of 25 m/s on level open tracks. Based on their actual geometric and dynamic parameters, aerodynamic and multi-body dynamic models were respectively established for the 8-car configuration. The k-ω SST turbulence model was used to calculate the unsteady aerodynamic forces acting on each car. These calculation results were then incorporated into the multi-body dynamic model as external excitations, leading to the development of a fluid-solid coupling simulation model for subsequent calculations related to wind-induced carbody vibrations and safety. The results showed that the aerodynamic forces acting on each car under steady strong crosswinds exhibited obvious unsteady behaviors, with main frequencies varying from 0.5 to 7.0 Hz. The influence of these unsteady aerodynamic forces led to an increase in both the lateral and vertical Sperling indexes of each car, with the lateral Sperling index of the head car reaching 3.3, indicating a considerable deterioration in ride comfort. The collisions between the bodies of the head and tail cars and the lateral stops, under the action of large lateral forces and yaw torques, exacerbated lateral vibrations. Compared with scenarios without aerodynamic loads, the safety indexes of both the head car and tail car under strong crosswinds of 25 m/s were significantly increased, but still remained within safety limits. The wind-induced lateral vibrations of the head car could be mitigated to some extent by increasing the lateral stop clearance and increasing the damping coefficient of both the anti-yaw damper and the secondary lateral damper.关键词：strong crosswind;intercity EMU;unsteady aerodynamic force;dynamic;stability;safety
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发布时间：2024-09-12 - 摘要：In the actuation process of active suspension systems for high-speed trains, the phenomenon of time delay is inevitable, which to some extent restricts the performance of these systems. This paper aims to investigate the impact of time delay in secondary lateral active suspension systems on the dynamic performance of vehicles. Firstly, a simplified 1/4 vehicle lateral model with two degrees of freedom (DOF) was established, and the theoretical calculation formula for critical time delays was derived. Next, a full-DOF dynamics model of high-speed trains was developed, and a control module was built in Simulink for co-simulation. A first-order low-pass filter was subsequently used to simulate the amplitude attenuation and phase lag characteristics of actual control forces. Furthermore, the influence laws of various strategies on time delays were explored, including modal sky-hook and PID control methods. Simulation results show that as time delays increase, the modal sky-hook control strategy leads to rapid deterioration in carbody vibrations and a rapid rise in the lateral Sperling index beyond 2.0. In contrast, the PID semi-active control brings about minimal increases in the lateral Sperling index. Time delays within 50 ms under both strategies don’t cause severe deterioration in the vibrations of the bogie frames. When considering the Sperling index as the criterion for critical time delays, most control strategies other than PID control strategy resulted in decreased critical time delays with increasing train speeds. This paper presents a systematic investigation into the issue of time delays, offering guidance for the design and optimization of active suspension systems for high-speed trains.关键词：high-speed train;active lateral suspension;time delay;ride comfort;co-simulation;high-speed EMU
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发布时间：2024-09-12 - 摘要：Radial permanent magnet electrodynamic wheels (PMEDW) offer a distinctive advantage through their integration of levitation and propulsion. However, they are prone to non-air-gap side magnetic flux leakage, resulting in a reduced utilization rate. To address this limitation and improve their load-carrying capacity through levitation, this paper proposes a novel magnetization scheme for PMEDWs, with the objective of enhancing their levitation drive capability without altering their overall mass. The proposed design employs a PMEDW structure featuring obliquely magnetized permanent magnets and radially magnetized permanent magnets, which are equally inserted between adjacent permanent magnets. The study investigated the basic principle of the permanent magnet wheel structure modified by introducing new magnetization methods. A three-dimensional finite element model was created to determine the optimal size of each structure through a solving process that incorporates two performance indexes: the levitation-to-weight and levitation-to-drag ratios. The simulation results revealed that the levitation force of the permanent magnet wheel structure increased by 14.8% with the introduction of obliquely magnetized permanent magnets, while the propulsion force showed a 14.98% enhancement. The permanent magnet wheel structure with equally inserted radially magnetized permanent magnets demonstrated a 9.2% increase in levitation force and a 7.6% improvement in propulsion force, respectively. The study findings indicate the proposed magnetization methods effectively elevate both the levitation and propulsion forces of the system, while maintaining the consumption of permanent magnets unchanged. The novel design not only reduces cost but also enhances the operating efficiency of the system, providing insights for future optimizations of the PMEDW structure and the design of magnetically levitated vehicles.关键词：permanent magnet electrodynamic wheel (PMEDW);Halbach array;magnetization structure;permanent magnet wheel utilization
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发布时间：2024-09-12 - 摘要：As a key component of low-floor trains, independent wheelsets suffer from issues such as lack of steering performance, wear, and noise due to their structure, which are major factors constraining the development of low-floor trains. Therefore, this paper established a rapid control prototype (RCP) test platform by utilizing the existing rolling test bench for single-axis bogies with independent wheelsets and combining it with the dSPACE system. Two active steering control strategies were proposed and verified through steering performance validation of independent wheelset, joint simulation validation of Simulink and SIMPACK, and hardware-in-the-loop simulation bench experiments of active steering control strategies. The experimental results show that the independent wheelsets themselves do not possess the curve centering ability, but when active steering control is added, the independent wheelsets can completely eliminate lateral offset. Both proposed active steering control strategies enable the independent wheelset vehicle to achieve good curve-passing performance, and under the compensation of vehicle speed and curve radius, the lateral displacement can efficiently be corrected to return independent wheelsets to the centerline position.关键词：independent wheelsets;active steering control;RCP test platform;hardware-in-the-loop simulation;dSPACE;urban rail transit
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发布时间：2024-09-12 - 摘要：To comprehensively study the energy-absorbing performance of cutting-type energy-absorbing devices under vertical offset loads, this study conducted full-scale vertical offset impact experiments and numerically simulated the collision process using LS-DYNA. Based on the verified finite element model, further exploration was performed to investigate the influence of vertical offset impact on the energy absorption process. The results indicated that the established finite element model accurately captured the cutting deformation process, showcasing close agreement between the projected collision responses and the experimental results. Under axial impact conditions, the cutting-type energy absorbing device exhibited a total energy absorption of 230.74 kJ, with an average force of 590.20 kN and a total compression of 387.02 mm. In contrast, under vertical offset impact conditions, the average force, total compression, and total energy absorption of the structure decreased by 2.6%, 1.8%, and 4.3%, respectively, when compared to axial impact conditions. The study reveals a deflection of the energy-absorbing tube by about 3° under the action of vertical offset impact, leading to a reduction in both the cutting depth and compression of the tool during the energy-absorption process. This adaption sheds light on the effect of vertical offset impact conditions on energy absorption performance.关键词：cutting-type energy-absorbing structure;structural design;vertical offset impact test;numerical simulation
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发布时间：2024-09-12 - 摘要：With the increase in train running speeds, the aerodynamic loading on the wipers of high-speed trains significantly escalates. Wiper failures under this aerodynamic loading pose serious risks on the driving safety. This paper focuses on investigating the aerodynamic performance of wipers on trains running at high speeds. A turbulence model based on the three-dimensional, steady and incompressible Navier-Stokes equations and k-epsilon (k-ε) two equations was utilized, to examine the aerodynamic characteristics of the wipers on a three-car high-speed train running on open tracks at speed levels of 300 km/h, 350 km/h and 400 km/h. The results indicate that with the increase in train speeds, aerodynamic forces on the wipers rise significantly, with lateral forces being the primary influence. The aerodynamic forces on the wipers of the head car are greater—up to 3.2 times—than those experienced by the tail car's wipers. The wipers on the head car exhibit an obvious negative pressure distribution at the outer side of the car body. The pressure difference on both sides of the wipers increases by 36% when the train speed reaches 350 km/h, and by 78% at 400 km/h, both compare to the conditions at 300 km/h. Moreover, air flows from the central axis of the train head to both sides of the car body, causing the wipers to move outward towards both sides. In contrast, the tail car's wipers show a trend of moving inward from both sides towards the central axis. These research findings offer valuable insights for the design, installation, and structural safety evaluation of wipers for high-speed trains.关键词：high-speed train;wiper;aerodynamic force;flow field characteristics;numerical simulation
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发布时间：2024-09-12
Railway Rolling Stock
- 摘要：With the progress and innovation in science and technology, automatic driving technology has made remarkable advancements. In automatic driving systems, the lateral control of vehicles plays a key role in realizing precise path tracking and ensuring stable driving. However, due to various issues including the transmission of sensor data, processing of controller data, and steering response from actuators, delays in control systems for automatic driving are unavoidable. These delays can deteriorate the lateral control performance and stability. Consequently, lateral control methods that take these delays into account have attracted a lot of attention. This paper summarizes and classifies these methods, and briefly introduces vehicle models and the lateral control techniques. Additionally, it analyzes the causes of delays and presents a delay model. The discussion focuses on three aspects of lateral control methods that address delays: delay-based predictive compensation, delay state-space augmentation, and robust control of delay disturbances.关键词：autonomous driving;lateral control;predictive compensation;state-space augmentation;robust control;delay
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发布时间：2024-09-12 - 摘要：The open operating environment of high-speed trains exposes them to disturbances from external resistances, which are difficult to characterize through modeling. To address this issue, this paper investigates a train model predictive tracking control (TMPC) strategy, with safety, ride comfort and punctuality as the tracking objectives. Firstly, a multi-objective predictive control model with constraints was constructed for high-speed trains, and the Tube invariant set of the system was calculated to tightly constrain train states and control forces. On this basis, in order to reduce the computational workload for solving the optimal control online, a dynamic event-triggered Tube model predictive control (DETMPC) strategy was designed, enabling the optimal control sequence to be solved only when the triggering conditions were satisfied. Furthermore, simulation verification was carried out using Shanghai urban trains running on real tracks. The results show that the control strategy proposed in this paper not only guarantee good tracking performance, but also reduce the frequencies of triggering the model predictive control (MPC), lowering the workload of online calculations significantly.关键词：high-speed train;automatic train operation;trajectory tracking;model predictive control;event-triggered control
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发布时间：2024-09-12 - 摘要：The field weakening control system for permanent magnet synchronous motors (PMSM) is commonly used in the field of electric vehicles (EV). PMSMs need to deliver high torque output to meet the demands of rapid starting, acceleration, and climbing for EVs when operating at low speeds. Moreover, they needs to maintain a certain load capacity in a field weakening state to support high-speed driving and overtaking for EVs when operating beyond the rated speed. To address speed mutations in PMSM field weakening control, this paper proposes the design of an active disturbance rejection controller (ADRC) to replace the proportional integral (PI) controller in the speed outer loop. The ADRC can quickly observe and compensate for disturbance terms, reducing system interference caused by speed mutations and enabling accurate speed tracking. To mitigate torque term interferences, this paper presents a combination of finite control set model predictive control (FCS-MPC) and a model predictive torque control system based on torque and flux linkage output design, to replace traditional direct torque control (DTC). Based on a value function constructed to minimize torque and flux linkage ripples, calculations and optimizations enable the selection of optimal space vector control signals that are then transmitted to the inverters. The optimized field weakening control system, incorporating both ADRC and FCS-MPC, demonstrates improvements in disturbance immunity, as well as current and torque output torque. The feasibility and performance advantages of the designed system are verified through experiments.关键词：permanent magnet synchronous motor (PMSM);active disturbances rejection controller (ADRC);finite control set model predictive control (FCS-MPC);field weakening control;speed and torque mutation;stability
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发布时间：2024-09-12 - 摘要：The reliability design and allocation for train network control systems play a significant guiding role in evaluating the advantages and disadvantages of different options, identifying weak links affecting system reliability, and promoting design improvements. This study analyzed reliability requirements for train network control systems and investigated theoretical technologies for calculations related to network topology reliability. On this basis, a network topology state transfer model for the redundant architecture of train network control systems was developed, and a mathematical expression for network topology reliability calculations was deduced from the Markov process. Furthermore, a scoring-based reliability allocation method for system components were proposed, considering multiple influencing factors, including complexity, technical development levels, importance, and environmental conditions. Finally, the proposed reliability calculation and allocation method for train network control systems was verified, based on inputs from practical applications. This approach has proven beneficial for topology design in train network control systems according to their RAMS allocation indexes in real-world projects and offers a basis for rationality demonstration of RAMS design.关键词：train network control system;network topology;reliability calculation;reliability allocation
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发布时间：2024-09-12
Electric Traction and Control
- 摘要：This paper aims to study the dynamic behaviors of the pantograph-catenary system for high-speed railway lines, focusing on the overall uplift data of contact wires. To achieve this, models of overhead contact systems (OCS) were established for four typical high-speed railway systems, along with three-degree-of-freedom models with reduction parameters for three types of high-speed pantographs. Moreover, the penalty function method was introduced to simulate pantograph-catenary interactions, leading to the establishment of a pantograph-catenary coupling model that was then utilized to simulate uplift changes of contact wire steady arms under different operating speeds and directions. Subsequently, an intelligent locating point recognition and classification method was proposed, based on the random forest algorithm. By using the inflection points of contact wire staggers as locating points, and leveraging existing detection data for the geometric parameters of the overhead contact systems, the voting results from the random forest algorithm were considered standards for determining the final locating points. Furthermore, a classification model was established to optimize the locating point data. After preprocessing the data obtained from the dynamic and static measurements of contact wire uplift, optimizing the locating points, and performing data spatial synchronization, continuous contact wire uplifts were ultimately generated. The research results indicate that the maximum uplift of the four typical steady arms increases with the increase in train operating speeds within the range of 170 km/h to 350 km/h. Under the conditions of 300 km/h and pantograph opening operation, the dynamic maximum uplift of steady arms for SSS400+ pantographs is smaller than that for the Faiveley CX-018 and DSA380 pantographs. The maximum uplifts ranged from 61.17 mm to 81.44 mm. Under specific OCS parameters, the average uplift of the contact wires during operation in the pantograph closing direction is higher than that during operation in the opening direction.关键词：high-speed railway;overhead contact system (OCS);contact wire uplift;data collection;pantograph-catenary coupling;high-speed train;finite element method
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发布时间：2024-09-12 - 摘要：Detecting pantograph-catenary arcing on trains is crucial for ensuring safety in railway operation and maintenance. Most existing detection methods rely on optical instruments to capture pantograph-catenary images, followed by the analysis of these images to identify arc spectra as evidence of arcing occurrences. However, these methods are limited by inadequate visibility in the external environments of trains, and maintenance access can be challenging. To address these issues, this paper proposed a detection method based on multi-frequency-band characteristics of current signals. First, based on the time-domain and frequency-domain characteristics of arcs, leveraging theoretically derived, simulated and measured waveforms, the following characteristic components of pantograph-catenary arcs were demonstrated: extremely low-frequency components caused by instantaneous ionization, harmonic components resulting from LC oscillation, and high-frequency components. These characteristic components were then utilized to devise a measurement scheme and data preprocessing algorithm, and historical data were incorporated, leading to the establishment of feature sets. Additionally, a random forest model was established, with feature vectors as inputs and detection results as outputs. The arcing labels and feature sets provided by 3C equipment were incorporated for training, to develop a classifier enabling real-time arcing detection. Its efficacy was demonstrated through on-board experiments, showcasing a detection precision up to 100% and a recall approximating 98.9%. In addition, the proposed method supports certain extensions for more application scenarios, after training using different event labels provided by users.关键词：electrical locomotive;arc transient characteristics;transducer application;Fourier transform;random forest
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发布时间：2024-09-12
Railway Electrification
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